Java最全文件操作实例汇总_Java教程-查字典教程网

本文实例汇总了Java文件操作。分享给大家供大家参考，具体如下：

1.创建文件夹

//import java.io.*; File myFolderPath = new File(%%1); try { if (!myFolderPath.exists()) { myFolderPath.mkdir(); } } catch (Exception e) { System.out.println("新建目录操作出错"); e.printStackTrace(); }

2.创建文件

//import java.io.*; File myFilePath = new File(%%1); try { if (!myFilePath.exists()) { myFilePath.createNewFile(); } FileWriter resultFile = new FileWriter(myFilePath); PrintWriter myFile = new PrintWriter(resultFile); myFile.println(%%2); resultFile.close(); } catch (Exception e) { System.out.println("新建文件操作出错"); e.printStackTrace(); }

3.删除文件

//import java.io.*; File myDelFile = new File(%%1); try { myDelFile.delete(); } catch (Exception e) { System.out.println("删除文件操作出错"); e.printStackTrace(); }

4.删除文件夹

//import java.io.*; File delFolderPath = new File(%%1); try { delFolderPath.delete(); //删除空文件夹 } catch (Exception e) { System.out.println("删除文件夹操作出错"); e.printStackTrace(); }

5.删除一个文件下夹所有的文件夹

//import java.io.*; File delfile=new File(%%1); File[] files=delfile.listFiles(); for(int i=0;i<files.length;i++){ if(files[i].isDirectory()){ files[i].delete(); } }

6.清空文件夹

//import java.io.*; File delfilefolder=new File(%%1); try { if (!delfilefolder.exists()) { delfilefolder.delete(); } delfilefolder.mkdir(); } catch (Exception e) { System.out.println("清空目录操作出错"); e.printStackTrace(); }

7.读取文件

//import java.io.*; // 逐行读取数据 FileReader fr = new FileReader(%%1); BufferedReader br = new BufferedReader(fr); String %%2 = br.readLine(); while (%%2 != null) { %%3 %%2 = br.readLine(); } br.close(); fr.close();

8.写入文件

//import java.io.*; // 将数据写入文件 try { FileWriter fw = new FileWriter(%%1); fw.write(%%2); fw.flush(); fw.close(); } catch (IOException e) { e.printStackTrace(); }

9.写入随机文件

//import java.io.*; try { RandomAcessFile logFile=new RandomAcessFile(%%1,"rw"); long lg=logFile.length(); logFile.seek(%%2); logFile.writeByte(%%3); }catch(IOException ioe){ System.out.println("无法写入文件："+ioe.getMessage()); }

10.读取文件属性

//import java.io.*; // 文件属性的取得 File af = new File(%%1); if (af.exists()) { System.out.println(f.getName() + "的属性如下：文件长度为：" + f.length()); System.out.println(f.isFile() "不是文件"); System.out.println(f.isDirectory() "不是目录"); System.out.println(f.canRead() "不"); System.out.println(f.canWrite() "是隐藏文件" : ""); System.out.println("文件夹的最后修改日期为：" + new Date(f.lastModified())); } else { System.out.println(f.getName() + "的属性如下："); System.out.println(f.isFile() "不是文件"); System.out.println(f.isDirectory() "不是目录"); System.out.println(f.canRead() "不"); System.out.println(f.canWrite() "是隐藏文件" : ""); System.out.println("文件的最后修改日期为：" + new Date(f.lastModified())); } if(f.canRead()){ %%2 } if(f.canWrite()){ %%3 }

11.写入属性

//import java.io.*; File filereadonly=new File(%%1); try { boolean b=filereadonly.setReadOnly(); } catch (Exception e) { System.out.println("拒绝写访问："+e.printStackTrace()); }

12.枚举一个文件夹中的所有文件

//import java.io.*; //import java.util.*; LinkedList<String> folderList = new LinkedList<String>(); folderList.add(%%1); while (folderList.size() > 0) { File file = new File(folderList.peek()); folderList.removeLast(); File[] files = file.listFiles(); ArrayList<File> fileList = new ArrayList<File>(); for (int i = 0; i < files.length; i++) { if (files[i].isDirectory()) { folderList.add(files[i].getPath()); } else { fileList.add(files[i]); } } for (File f : fileList) { %%2=f.getAbsoluteFile(); %%3 } }

13.复制文件夹

//import java.io.*; //import java.util.*; LinkedList<String> folderList = new LinkedList<String>(); folderList.add(%%1); LinkedList<String> folderList2 = new LinkedList<String>(); folderList2.add(%%2+ %%1.substring(%%1.lastIndexOf("//"))); while (folderList.size() > 0) { (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在则建立新文件夹 File folders = new File(folderList.peek()); String[] file = folders.list(); File temp = null; try { for (int i = 0; i < file.length; i++) { if (folderList.peek().endsWith(File.separator)) { temp = new File(folderList.peek() + File.separator + file[i]); } else { temp = new File(folderList.peek() + File.separator + file[i]); } if (temp.isFile()) { FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream( folderList2.peek() + File.separator + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ((len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if (temp.isDirectory()) {// 如果是子文件夹 for (File f : temp.listFiles()) { if (f.isDirectory()) { folderList.add(f.getPath()); folderList2.add(folderList2.peek() + File.separator + f.getName()); } } } } } catch (Exception e) { //System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } folderList.removeFirst(); folderList2.removeFirst(); }

14.复制一个文件夹下所有的文件夹到另一个文件夹下

//import java.io.*; //import java.util.*; File copyfolders=new File(%%1); File[] copyfoldersList=copyfolders.listFiles(); for(int k=0;k<copyfoldersList.length;k++){ if(copyfoldersList[k].isDirectory()){ ArrayList<String>folderList=new ArrayList<String>(); folderList.add(copyfoldersList[k].getPath()); ArrayList<String>folderList2=new ArrayList<String>(); folderList2.add(%%2+"/"+copyfoldersList[k].getName()); for(int j=0;j<folderList.length;j++){ (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在则建立新文件夹 File folders=new File(folderList.get(j)); String[] file=folders.list(); File temp=null; try { for (int i = 0; i < file.length; i++) { if(folderList.get(j).endsWith(File.separator)){ temp=new File(folderList.get(j)+"/"+file[i]); } else{ temp=new File(folderList.get(j)+"/"+File.separator+file[i]); } FileInputStream input = new FileInputStream(temp); if(temp.isFile()){ FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ( (len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if(temp.isDirectory()){//如果是子文件夹 folderList.add(folderList.get(j)+"/"+file[i]); folderList2.add(folderList2.get(j)+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } } } }

15.移动文件夹

//import java.io.*; //import java.util.*; LinkedList<String> folderList = new LinkedList<String>(); folderList.add(%%1); LinkedList<String> folderList2 = new LinkedList<String>(); folderList2.add(%%2 + %%1.substring(%%1.lastIndexOf("//"))); while (folderList.size() > 0) { (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在则建立新文件夹 File folders = new File(folderList.peek()); String[] file = folders.list(); File temp = null; try { for (int i = 0; i < file.length; i++) { if (folderList.peek().endsWith(File.separator)) { temp = new File(folderList.peek() + File.separator + file[i]); } else { temp = new File(folderList.peek() + File.separator + file[i]); } if (temp.isFile()) { FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream( folderList2.peek() + File.separator + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ((len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); if (!temp.delete()) System.out.println("删除单个文件操作出错!"); } if (temp.isDirectory()) {// 如果是子文件夹 for (File f : temp.listFiles()) { if (f.isDirectory()) { folderList.add(f.getPath()); folderList2.add(folderList2.peek() + File.separator + f.getName()); } } } } } catch (Exception e) { // System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } folderList.removeFirst(); folderList2.removeFirst(); } File f = new File(%%1); if (!f.delete()) { for (File file : f.listFiles()) { if (file.list().length == 0) { System.out.println(file.getPath()); file.delete(); } } }

16.移动一个文件夹下所有的文件夹到另一个目录下

//import java.io.*; //import java.util.*; File movefolders=new File(%%1); File[] movefoldersList=movefolders.listFiles(); for(int k=0;k<movefoldersList.length;k++){ if(movefoldersList[k].isDirectory()){ ArrayList<String>folderList=new ArrayList<String>(); folderList.add(movefoldersList[k].getPath()); ArrayList<String>folderList2=new ArrayList<String>(); folderList2.add(%%2+"/"+movefoldersList[k].getName()); for(int j=0;j<folderList.length;j++){ (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在则建立新文件夹 File folders=new File(folderList.get(j)); String[] file=folders.list(); File temp=null; try { for (int i = 0; i < file.length; i++) { if(folderList.get(j).endsWith(File.separator)){ temp=new File(folderList.get(j)+"/"+file[i]); } else{ temp=new File(folderList.get(j)+"/"+File.separator+file[i]); } FileInputStream input = new FileInputStream(temp); if(temp.isFile()){ FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ( (len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); temp.delete(); } if(temp.isDirectory()){//如果是子文件夹 folderList.add(folderList.get(j)+"/"+file[i]); folderList2.add(folderList2.get(j)+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } } movefoldersList[k].delete(); } }

17.以一个文件夹的框架在另一个目录创建文件夹和空文件

//import java.io.*; //import java.util.*; boolean b=false;//不创建空文件 ArrayList<String>folderList=new ArrayList<String>(); folderList.add(%%1); ArrayList<String>folderList2=new ArrayList<String>(); folderList2.add(%%2); for(int j=0;j<folderList.length;j++){ (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在则建立新文件夹 File folders=new File(folderList.get(j)); String[] file=folders.list(); File temp=null; try { for (int i = 0; i < file.length; i++) { if(folderList.get(j).endsWith(File.separator)){ temp=new File(folderList.get(j)+"/"+file[i]); } else{ temp=new File(folderList.get(j)+"/"+File.separator+file[i]); } FileInputStream input = new FileInputStream(temp); if(temp.isFile()){ if (b) temp.createNewFile(); } if(temp.isDirectory()){//如果是子文件夹 folderList.add(folderList.get(j)+"/"+file[i]); folderList2.add(folderList2.get(j)+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } }

18.复制文件

//import java.io.*; int bytesum = 0; int byteread = 0; File oldfile = new File(%%1); try { if (oldfile.exists()) { //文件存在时 FileInputStream inStream = new FileInputStream(oldfile); //读入原文件 FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName())); byte[] buffer = new byte[5120]; int length; while ( (byteread = inStream.read(buffer)) != -1) { bytesum += byteread; //字节数文件大小 System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); } } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); }

19.复制一个文件夹下所有的文件到另一个目录

//import java.io.*; File copyfiles=new File(%%1); File[] files=copyfiles.listFiles(); for(int i=0;i<files.length;i++){ if(!files[i].isDirectory()){ int bytesum = 0; int byteread = 0; try { InputStream inStream = new FileInputStream(files[i]); //读入原文件 FileOutputStream fs = new FileOutputStream(new File(%%2,files[i].getName()); byte[] buffer = new byte[5120]; int length; while ( (byteread = inStream.read(buffer)) != -1) { bytesum += byteread; //字节数文件大小 System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); } } }

20.提取扩展名

复制代码代码如下:String %%2=%%1.substring(%%1.lastIndexOf(".")+1);

21.提取文件名

复制代码代码如下:String %%2=%%1.substring(%%1.lastIndexOf("//")+1);

22.提取文件路径

复制代码代码如下:String %%2=%%1.substring(0,%%1.lastIndexOf("//"));

23.替换扩展名

//import java.io.*; File replaceExt=new File(%%1); replaceExt.renameTo(replaceExt.getName().split(".")[0]+"."+%%2);

24.追加路径

final String path=%%1.endsWith("//")"; %%3=path+%%2;

25.移动文件

//import java.io.*; int bytesum = 0; int byteread = 0; File oldfile = new File(%%1); try { if (oldfile.exists()) { //文件存在时 InputStream inStream = new FileInputStream(oldfile); //读入原文件 FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName())); byte[] buffer = new byte[5120]; int length; while ( (byteread = inStream.read(buffer)) != -1) { bytesum += byteread; //字节数文件大小 //System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); oldfile.delete(); } } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); }

26.移动一个文件夹下所有文件到另一个目录

//import java.io.*; File movefile=new File(%%1); File[] movefiles=movefile.listFiles(); for(int i=0;i<movefiles.length;i++){ if(movefiles[i].isFile()){ int bytesum = 0; int byteread = 0; File oldfile = new File(movefiles[i]); try { if (oldfile.exists()) { //文件存在时 InputStream inStream = new FileInputStream(oldfile); //读入原文件 FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName())); byte[] buffer = new byte[5120]; int length; while ( (byteread = inStream.read(buffer)) != -1) { bytesum += byteread; //字节数文件大小 //System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); oldfile.delete(); } } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); } } }

27.指定目录下搜索文件

//import java.io.*; String filter="*.*"; String path=%%1; File file = new File(path); if(file.exists()) { if(file.isDirectory()) { File[] fileArray = file.listFiles(); for(File f:fileArray) { if(f.isDirectory()) { doSearch(filter,f.getPath()); } else { if(f.getName().indexOf(filter) >= 0) { countFiles++; result.append(f.getPath() + "/r/n"); } } statusShow1.setText(f.getPath()); } statusShow2.setText("The numbers of files had been found:" + countFiles); } else { System.out.println("Couldn't open the path!"); } } else { System.out.println("The path had been apointed was not Exist!"); }

28.打开对话框

//import java.io.*; //import javax.swing.*; JFileChooser Jfc = new JFileChooser(); //建立选择档案对话方块盒 Jfc if (Jfc.isFileSelectionEnabled()) { File %%1 = Jfc.getSelectedFile(); }

29.文件分割

//import java.io.* try { File f=new File(%%1); FileInputStream fileInputStream = new FileInputStream(f); byte[] buffer = new byte[fileInputStream.available()]; FileInputStream.read(buffer); fileInputStream.close(); String strFileName = f.getName(); FileOutputStream fileOutputStream = new FileOutputStream(new File(%%2+"//"+ strFileName + "1")); fileOutputStream.write(buffer,0,buffer.length/2); fileOutputStream.close(); fileOutputStream = new FileOutputStream(new File(%%2+"//"+ strFileName + "2")); fileOutputStream.write(buffer, buffer.length/2, buffer.length-buffer.length/2); fileOutputStream.close(); } catch (ArrayIndexOutOfBoundsException e) { System.out.print("using FileStreamDemo src des"); e.printStackTrace(); } catch(IOException e){ e.printStackTrace(); }

30.文件合并

//import java.io.* String strFileName = %%1.substring(%%1.LastIndexOf("//") + 1); try { FileInputStream fileInputStream1 = new FileInputStream(new File(%%2 + strFileName + "1")); FileInputStream fileInputStream2 = new FileInputStream(new File(%%2 + strFileName + "2")); byte[] buffer = new byte[fileInputStream1.available()+fileInputStream2.available()]; FileInputStream.read(buffer, 0, fileInputStream1.available()); FileInputStream2.read(buffer, fileInputStream1.available(), fileInputStream2.available()); fileInputStream.close(); fileInputStream2.close(); FileOutputStream fileOutputStream = new FileOutputStream(new File(%%2+"//"+ strFileName)); fileOutputStream.write(buffer,0,buffer.length); fileOutputStream.close(); catch(IOException e){ e.printStackTrace(); }

31.文件简单加密

//import java.io.* try { File f=new File((new File(%%1)).getPath()+"//enc_"+(new File(%%1)).getName().split("//")[1]); String strFileName = f.getName(); FileInputStream fileInputStream = new FileInputStream(%%2+"//"+strFilename); byte[] buffer = new byte[fileInputStream.available()]; FileInputStream.read(buffer); fileInputStream.close(); for(int i=0;i<buffer.length;i++) { int ibt=buffer[i]; ibt+=100; ibt%=256; buffer[i]=(byte)ibt; } FileOutputStream fileOutputStream = new FileOutputStream(f); fileOutputStream.write(buffer,0,buffer.length); fileOutputStream.close(); } catch(ArrayIndexOutOfBoundException e){ e.printStackTrace(); } catch(IOException e){ e.printStackTrace(); }

32.文件简单解密

//import java.io.* try { File f=new File(%%1); String strFileName = f.getName(); FileInputStream fileInputStream = new FileInputStream(%%2+"//enc_"+strFilename); byte[] buffer = new byte[fileInputStream.available()]; FileInputStream.read(buffer); fileInputStream.close(); for(int i=0;i<buffer.length;i++) { int ibt=buffer[i]; ibt-=100; ibt+=256; ibt%=256; buffer[i]=(byte)ibt; } FileOutputStream fileOutputStream = new FileOutputStream(f); fileOutputStream.write(buffer,0,buffer.length); fileOutputStream.close(); } catch(ArrayIndexOutOfBoundException e){ e.printStackTrace(); } catch(IOException e){ e.printStackTrace(); }

33.写入ini文件属性

//import java.io.*; //import java.util.*; //import java.util.regex.*; if (configMap == null) { String WriteBuffer = ""; configMap = new HashMap<String, Serializable>(); String strLine = null; String currentNode = null; String previousNode = null; Vector<Properties> vec = new Vector<Properties>(); int row = 0; FileReader fileReader = null; try { fileReader = new FileReader("Config.ini"); } catch (FileNotFoundException e1) { e1.printStackTrace(); } BufferedReader bufferedReader = new BufferedReader(fileReader); try { while ((strLine = bufferedReader.readLine()) != null) { String oneLine = strLine.trim(); if (oneLine.length() >= 1) { Pattern p = Pattern.compile("//[//s*.*//s*//]"); int nodelen = oneLine.split("[;]").length; String[] strArray1 = new String[4]; if (nodelen == 1) { oneLine = oneLine.split("[;]")[0].trim(); } else if (nodelen == 2) { strArray1[3] = oneLine.split("[;]")[1].trim(); oneLine = oneLine.split("[;]")[0].trim(); } Matcher m = p.matcher(oneLine); if (m.matches()) { strArray1[0] = "@Node"; strArray1[1] = oneLine; strArray1[2] = ""; } else { int keylen = oneLine.split("=").length; if (keylen == 1) { strArray1[0] = "@Key"; strArray1[1] = oneLine.split("=")[0]; strArray1[2] = ""; } else if (keylen == 2) { strArray1[0] = "@Key"; strArray1[1] = oneLine.split("=")[0]; strArray1[2] = oneLine.split("=")[1]; } else { strArray1[0] = "@ElementError"; strArray1[1] = ""; strArray1[2] = ""; strArray1[3] = ""; } } if (strArray1[0].equals("@Node")) { previousNode = currentNode; currentNode = strArray1[1]; if (row > 0) { configMap.put(previousNode, vec.elementAt(0)); vec.clear(); row = 0; } WriteBuffer += (oneLine + "/r/n"); } else if (strArray1[0].equals("@Key") && row == 0) { Properties ht = new Properties(); ht.setProperty(strArray1[1], strArray1[2]); if (strArray1[1].equals(%%1)) { WriteBuffer += (%%1+"=" + %%2 + "/r/n"); } else WriteBuffer += (oneLine + "/r/n"); vec.add(0, ht); row++; } else if (strArray1[0].equals("@Key") && row > 0) { Properties ht2 = new Properties(); ht2.put(strArray1[1], strArray1[2]); vec.clear(); vec.add(0, ht2); WriteBuffer += (oneLine + "/r/n"); row++; } } } configMap.put(currentNode, vec.elementAt(0)); } catch (FileNotFoundException e) { configMap = null; e.printStackTrace(); } catch (IOException e) { configMap = null; e.printStackTrace(); } finally { vec.clear(); try { bufferedReader.close(); fileReader.close(); } catch (IOException e) { e.printStackTrace(); } try { FileWriter fw = new FileWriter("Config.ini"); fw.write(WriteBuffer); fw.flush(); fw.close(); } catch (IOException e) { e.printStackTrace(); } } }

34.读取ini文件属性

//import java.io.*; //import java.util.*; //import java.util.regex.*; //private HashMap configMap=null; private Map<String, Serializable> configMap=null; String %%2=null; if (configMap == null) { configMap = new HashMap<String, Serializable>(); String strLine = null; String currentNode = null; String previousNode = null; Vector<Properties> vec = new Vector<Properties>(); int row = 0; FileReader fileReader = null; try { fileReader = new FileReader("Config.ini"); } catch (FileNotFoundException e1) { e1.printStackTrace(); } BufferedReader bufferedReader = new BufferedReader(fileReader); try { while ((strLine = bufferedReader.readLine()) != null) { String oneLine = strLine.trim(); if (oneLine.length() >= 1) { Pattern p = Pattern.compile("//[//s*.*//s*//]"); int nodelen = oneLine.split("[;]").length; String[] strArray1 = new String[4]; if (nodelen == 1) { oneLine = oneLine.split("[;]")[0].trim(); } else if (nodelen == 2) { strArray1[3] = oneLine.split("[;]")[1].trim(); oneLine = oneLine.split("[;]")[0].trim(); } Matcher m = p.matcher(oneLine); if (m.matches()) { strArray1[0] = "@Node"; strArray1[1] = oneLine; strArray1[2] = ""; } else { int keylen = oneLine.split("=").length; if (keylen == 1) { strArray1[0] = "@Key"; strArray1[1] = oneLine.split("=")[0]; strArray1[2] = ""; } else if (keylen == 2) { strArray1[0] = "@Key"; strArray1[1] = oneLine.split("=")[0]; strArray1[2] = oneLine.split("=")[1]; } else { strArray1[0] = "@ElementError"; strArray1[1] = ""; strArray1[2] = ""; strArray1[3] = ""; } } if (strArray1[0].equals("@Node")) { previousNode = currentNode; currentNode = strArray1[1]; if (row > 0) { configMap.put(previousNode, vec.elementAt(0)); vec.clear(); row = 0; } } else if (strArray1[0].equals("@Key") && row == 0) { Properties ht = new Properties(); ht.setProperty(strArray1[1], strArray1[2]); if(strArray1[1].equals(%%1)) { %%2=strArray1[2]; return; } vec.add(0, ht); row++; } else if (strArray1[0].equals("@Key") && row > 0) { Properties ht2 = new Properties(); ht2.put(strArray1[1], strArray1[2]); vec.clear(); vec.add(0, ht2); row++; } } } configMap.put(currentNode, vec.elementAt(0)); } catch (FileNotFoundException e) { configMap = null; e.printStackTrace(); } catch (IOException e) { configMap = null; e.printStackTrace(); } finally { vec.clear(); try { bufferedReader.close(); fileReader.close(); } catch (IOException e) { e.printStackTrace(); } } }

35.合并一个文件下所有的文件

File combinefiles=new File(%%1); File[] files=combinefiles.listFiles(); FileOutputStream fs; try { fs=new FileOutputStream(new File(%%2)); } catch(IOException e){ e.printStackTrace(); } for(int i=0;i<files.length;i++){ if(files[i].isFile()){ int bytesum=0; int byteread=0; try { FileInputStream inStream=new FileInputStream(files[i]); byte[] buffer = new byte[5120]; int length; while((byteread=inStream.read(buffer))!=-1){ bytesum+=byteread; fs.write(buffer,0,byteread); } inStream.close(); } catch(Exception e){ //复制文件出错 e.printStackTrace(); } } } try { fs.close(); } catch(IOException e){ { e.printStackTrace(); }

36.写入ini文件属性

//import java.io.*; //import java.util.*; //import java.util.regex.*; //private HashMap configMap=null; private Map<String, Serializable> configMap=null; if(configMap==null) { String strLine=null; String currentNode=null; String previousNode=null; Vector<Properties> vec=new Vector<Properties>(); int row=0; FileReader fileReader = null; try { fileReader = new FileReader(%%1); } catch (FileNotFoundException e1) { e1.printStackTrace(); } BufferedReader bufferedReader=new BufferedReader(fileReader); try { while((strLine=bufferedReader.readLine())!=null) { String oneLine=strLine.trim(); if(oneLine.length()>=1) { Pattern p=Pattern.compile("//[//s*.*//s*//]"); int nodelen=oneLine.split("[;]").length; String[] strArray1=new String[4]; if(nodelen==1) { oneLine=oneLine.split("[;]")[0].trim(); } else if(nodelen==2) { strArray1[3]=oneLine.split("[;]")[1].trim(); oneLine=oneLine.split("[;]")[0].trim(); } Matcher m=p.matcher(oneLine); if(m.matches()) { strArray1[0]="@Node"; strArray1[1]=oneLine; strArray1[2]=""; } else { int keylen=oneLine.split("=").length; if(keylen==1) { strArray1[0]="@Key"; strArray1[1]=oneLine.split("=")[0]; strArray1[2]=""; } else if(keylen==2) { strArray1[0]="@Key"; strArray1[1]=oneLine.split("=")[0]; strArray1[2]=oneLine.split("=")[1]; } else { strArray1[0]="@ElementError"; strArray1[1]=""; strArray1[2]=""; strArray1[3]=""; } } if(strArray1[0].equals("@Node")) { previousNode=currentNode; currentNode=strArray1[1]; if(row>0) { configMap.put(previousNode,vec.elementAt(0)); //"size:"+configMap.size() vec.clear(); row=0; } } else if(strArray1[0].equals("@Key") && row==0) { Properties ht=new Properties(); ht.setProperty(strArray1[1],strArray1[2]); vec.add(0,ht); row++; } else if(strArray1[0].equals("@Key") && row>0) { Properties ht2=new Properties(); ht2.put(strArray1[1],strArray1[2]); vec.clear(); vec.add(0,ht2); row++; } } } configMap.put(currentNode,vec.elementAt(0)); } catch (FileNotFoundException e) { configMap=null; e.printStackTrace(); } catch (IOException e) { configMap=null; e.printStackTrace(); } finally { vec.clear(); try { bufferedReader.close(); fileReader.close(); } catch (IOException e) { e.printStackTrace(); } } } String nodeKey="["+%%2+"]"; Properties ht=null; if(configMap.containsKey(nodeKey)) { ht=(Properties)configMap.get(nodeKey); } else { ht=(Properties)configMap.put(nodeKey,%%3); } try { ht.setProperty(%%3,%%4); } catch (NullPointException e) { e.printStackTrace(); } FileWriter fw= null; BufferedWriter bw= null; try { fw = new FileWriter(%%1); bw=new BufferedWriter(fw); } catch (IOException e) { e.printStackTrace(); } Set keys=configMap.keySet(); Iterator ite=keys.iterator(); while(ite.hasNext()) { String oneKey=(String)ite.next(); try { bw.write(oneKey+"/n"); } catch (IOException e) { e.printStackTrace(); } ht=(Properties)configMap.get(oneKey); ht.list(new PrintWriter(bw,true)); }

37.获得当前路径

复制代码代码如下:String %%1=this.getClass().getResource("/").getPath();

38.读取XML数据库

//import java.io.*; //import javax.xml.parsers.*; //import org.xml.sax.*; //import org.w3c.dom.*; private Document document; File xml_file=new File(%%1); DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance(); try { DocumentBuilder builder=factory.newDocumentBuilder(); document=builder.parse(xml_file); } catch(Exception e) { e.printStackTrace(); } String subNodeTag=%%2; Element rootNode=document.getDocumentElement(); //%%2="serverList" //%%4="id" //%%6="port" //%%3="server" //%%5="ipaddr" NodeList nlist=rootNode.getElementsByTagName(subNodeTag); int len=nlist.getLength(); Node x=null; for(int i=0;i<len;i++) { x=nlist.item(i); String getNodeAttrValue=null; NamedNodeMap attrList=node.getAttributes(); for(int j=0;j<attrList.getLength();j++) { if(attrList.item(j).getNodeName().compareTo(%%7)==0) { getNodeAttrValue=attrList.item(j).getNodeValue(); break; } } if(getNodeAttrValue.compareTo(%%8)==0) break; } String %%9=null; if(x!=null) { NodeList nlist=node.getChildNodes(); int len=nlist.getLength(); Node currentNode; String nodeName; for(int i=0;i<len;i++) { currentNode=nlist.item(i); nodeName=currentNode.getNodeName(); if(nodeName.equals(%%5)==0) { %%9=document.getElementValue(currentNode); break; } } }

39.写入XML数据库

//import java.io.*; //import javax.xml.parsers.*; //import org.xml.sax.*; //import org.w3c.dom.*; //import javax.xml.transform.*; //import javax.xml.transform.dom.*; //import javax.xml.transform.stream.*; private Document document; private Element node; File xml_file=new File(%%1); DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance(); try { DocumentBuilder builder=factory.newDocumentBuilder(); document=builder.parse(xml_file); } catch(Exception e) { e.printStackTrace(); } String subNodeTag=%%2; Element rootNode=document.getDocumentElement(); //%%2="serverList" //%%4="id" //%%6="port" //%%3="server" //%%5="ipaddr" NodeList nlist=rootNode.getElementByTagName(subNodeTag); node=document.createElement(%%3); node.setAttribute(%%4,nlist.getLength()+1).toString()); node.appendChild(document.createTextNode("/n"); Element ipNode=document.createElement(%%5); ipNode.appendChild(document.createTextNode(%%8)); node.appendChild(ipNode); node.appendChild(document,createTextNode("/n"); Element port=document.createElement(%%6); port.appendChild(document.createTextNode(%%9)); node.appendChild(port); node.appendChild(document,createTextNode("/n"); nlist.appendChild(node); TransformerFactory tFactory=TransformerFactory.newInstance(); Transformer transformer=null; try { transformer=tFactory.newTransformer(); DOMSource source=new DOMSource(document); StreamResult result=new StreamResult(xml_file); transformer.transform(source,result); } catch(Exception e) { e.printStackTrace(); }

40.ZIP压缩文件

//import java.io.*; //import java.util.zip.*; //创建文件输入流对象 FileInputStream fis=new FileInputStream(%%1); //创建文件输出流对象 FileOutputStream fos=new FileOutputStream(%%2); //创建ZIP数据输出流对象 ZipOutputStream zipOut=new ZipOutputStream(fos); //创建指向压缩原始文件的入口 ZipEntry entry=new ZipEntry(args[0]); zipOut.putNextEntry(entry); //向压缩文件中输出数据 int nNumber; byte[] buffer=new byte[1024]; while((nNumber=fis.read(buffer))!=-1) zipOut.write(buffer,0,nNumber); //关闭创建的流对象 zipOut.close(); fos.close(); fis.close(); } catch(IOException e) { System.out.println(e); }

41.获得应用程序完整路径

复制代码代码如下:String %%1=System.getProperty("user.dir");

42.ZIP解压缩

//import java.io.*; //import java.util.zip.*; try{ //创建文件输入流对象实例 FileInputStream fis=new FileInputStream(%%1); //创建ZIP压缩格式输入流对象实例 ZipInputStream zipin=new ZipInputStream(fis); //创建文件输出流对象实例 FileOutputStream fos=new FileOutputStream(%%2); //获取Entry对象实例 ZipEntry entry=zipin.getNextEntry(); byte[] buffer=new byte[1024]; int nNumber; while((nNumber=zipin.read(buffer,0,buffer.length))!=-1) fos.write(buffer,0,nNumber); //关闭文件流对象 zipin.close(); fos.close(); fis.close(); } catch(IOException e) { System.out.println(e); }

43.递归删除目录中的文件

//import java.io.*; //import java.util.*; ArrayList<String> folderList = new ArrayList<String>(); folderList.add(%%1); for (int j = 0; j < folderList.size(); j++) { File file = new File(folderList.get(j)); File[] files = file.listFiles(); ArrayList<File> fileList = new ArrayList<File>(); for (int i = 0; i < files.length; i++) { if (files[i].isDirectory()) { folderList.add(files[i].getPath()); } else { fileList.add(files[i]); } } for (File f : fileList) { f.delete(); } }

43.ZIP压缩文件夹

//import java.io.*; //import org.apache.tools.zip.ZipOutputStream; //这个包在ant.jar里，要到官方网下载 //import java.util.zip.*; try { String zipFileName = %%2; //打包后文件名字 File f=new File(%%1); ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName)); String base= ""; if (f.isDirectory()) { File[] fl = f.listFiles(); out.putNextEntry(new org.apache.tools.zip.ZipEntry(base + "/")); base = base.length() == 0 "; for (int i = 0; i < fl.length; i++) { zip(out, fl[i], base + fl[i].getName()); } }else { out.putNextEntry(new org.apache.tools.zip.ZipEntry(base)); FileInputStream in = new FileInputStream(f); int b; while ( (b = in.read()) != -1) { out.write(b); } in.close(); } out.close(); }catch (Exception ex) { ex.printStackTrace(); }

44.Java验证DTD

//import java.io.*; //import javax.xml.parsers.*; //import org.xml.sax.*; //import org.w3c.dom.*; try { InputStream in=new FileInputStream(filePath); SAXReader saxReader = new SAXReader(); this.document = saxReader.read(in); DocumentBuilderFactory factory = null; factory = DocumentBuilderFactory.newInstance(); //进行dtd检查 factory.setValidating(true); } catch (Exception e) { }

45.验证Schema

//import java.io.*; //import javax.xml.parsers.*; //import org.xml.sax.*; //import org.w3c.dom.*; String xsdFileName = /"Q:////_dev_stu////xsdtest////src////note.xsd/"; try { //创建默认的XML错误处理器 XMLErrorHandler errorHandler = new XMLErrorHandler(); //获取基于 SAX 的解析器的实例 SAXParserFactory factory = SAXParserFactory.newInstance(); //解析器在解析时验证 XML 内容。 factory.setValidating(true); //指定由此代码生成的解析器将提供对 XML 名称空间的支持。 factory.setNamespaceAware(true); //使用当前配置的工厂参数创建 SAXParser 的一个新实例。 SAXParser parser = factory.newSAXParser(); //创建一个读取工具 SAXReader xmlReader = new SAXReader(); //获取要校验xml文档实例 Document xmlDocument = (Document) xmlReader.read(new File(xmlFileName)); //设置 XMLReader 的基础实现中的特定属性。核心功能和属性列表可以在 http://sax.sourceforge.net/?selected=get-set 中找到。 parser.setProperty( /"http://java.sun.com/xml/jaxp/properties/schemaLanguage", /"http://www.w3.org/2001/XMLSchema"); parser.setProperty( /"http://java.sun.com/xml/jaxp/properties/schemaSource", /"file:/" + xsdFileName); //创建一个SAXValidator校验工具，并设置校验工具的属性 SAXValidator validator = new SAXValidator(parser.getXMLReader()); //设置校验工具的错误处理器，当发生错误时，可以从处理器对象中得到错误信息。 validator.setErrorHandler(errorHandler); //校验 validator.validate(xmlDocument); XMLWriter writer = new XMLWriter(OutputFormat.createPrettyPrint()); //如果错误信息不为空，说明校验失败，打印错误信息 if (errorHandler.getErrors().hasContent()) { System.out.println(/"XML文件通过XSD文件校验失败！/"); writer.write(errorHandler.getErrors()); } else { System.out.println(/"Good! XML文件通过XSD文件校验成功！/"); } } catch (Exception ex) { System.out.println(/"XML文件: /" + xmlFileName + /" 通过XSD文件:/" + xsdFileName + /"检验失败。/n原因： /" + ex.getMessage ()); ex.printStackTrace(); } }

46.Grep

//import java.util.regex.*; //import java.io.*; /** * Simple implementation of the ubiquitous grep command. * First argument is the regular expression to search for (remember to * quote and/or escape as appropriate). All following arguments are * filenames to read and search for the regular expression. * * Created: April, 2002 * @author Ron Hitchens (ron@ronsoft.com) * @version $Id: SimpleGrep.java,v 1.1 2002/05/07 02:21:08 ron Exp $ */ public static void main (String [] argv) throws Exception { if (argv.length < 2) { // 如果参数行没有输入参数，结束程序 System.out.println ("Usage: regex file [ ... ]"); return; } Pattern pattern = Pattern.compile (argv [0]); // 第一个参数为需要匹配的字符串 Matcher matcher = pattern.matcher (""); // 一次读取各个文件 for (int i = 1; i < argv.length; i++) { String file = argv [i]; // 第2个参数开始，均为文件名。 BufferedReader br = null; String line; try { br = new BufferedReader (new FileReader (file)); // 打开文件 } catch (IOException e) { // 没有打开文件，则产生异常 System.err.println ("Cannot read '" + file + "': " + e.getMessage()); continue; } while ((line = br.readLine()) != null) { // 读入一行，直到文件结束 matcher.reset (line); // 匹配字符串 if (matcher.find()) { // 如果有匹配的字符串，则输出 System.out.println (file + ": " + line); } } br.close(); // 关闭文件 } }

47.直接创建多级目录

//import java.io.*; File f=new File(%%1); f.mkdirs();

48.批量重命名

//import java.io.*; File target = new File("%%1"); String[] files = target.list(); File f = null; String filename = null; for (String file : files) { f = new File(fl, file); filename = f.getName(); if (filename.substring(filename.lastIndexOf (".")).equalsIgnoreCase( "%%2")) { f.renameTo(new File(target.getAbsolutePath(), filename.replace( "%%2", "%%3"))); // 这里可以反复使用replace替换,当然也可以使用正则表达式来 //替换了 ".txt" ".bat" } }

49.文本查找替换

//import java.nio.*; String s1=%%1; String s2=%%2; String s3=%%3; int pos=%%4; /*变量i和j分别表示主串和模式串中当前字符串的位置，k表示匹配次数*/ int i,j,k=0; i = pos; j = 0; //将s1转化成StringBuffer型进行操作 repStr = new StringBuffer(s1); while(i<repStr.length()&&j<s2.length()) { if(repStr.charAt(i) == s2.charAt(j)) { ++i; ++j; if(j==s2.length()) { /*j=s2.length()表示字符串匹配成功，匹配次数加1，此外对主串进行字符串替换*/ k = k+1; repStr.replace(i-j,i,s3); //将j进行重新赋值开始新的比较 j = 0; } } else {i = i-j+1; j = 0;} } return k;

50.文件关联

//import java.io.*; try { Runtime.getRuntime().exec(%%1); //"assoc .txt =mynote" "assoc [.ext[=[filetype]]]" } catch (IOException e) { e.printStackTrace(); }

52.设置JDK环境变量

@echo off IF EXIST %1/bin/java.exe ( rem 如输入正确的 Java2SDK 安装目录，开始设置环境变量 @setx JAVA_HOME %1 @setx path %path%;%JAVA_HOME%/bin @setx classpath %classpath%;. @setx classpath %classpath%;%JAVA_HOME%/lib/tools.jar @setx classpath %classpath%;%JAVA_HOME%/lib/dt.jar @setx classpath %classpath%;%JAVA_HOME%/jre/lib/rt.jar @echo on @echo Java 2 SDK 环境参数设置完毕，正常退出。 ) ELSE ( IF "%1"=="" ( rem 如没有提供安装目录，提示之后退出 @echo on @echo 没有提供 Java2SDK 的安装目录,不做任何设置，现在退出环境变量设置。 ) ELSE ( rem 如果提供非空的安装目录但没有bin/java.exe，则指定的目录为错误的目录 @echo on @echo 非法的 Java2SDK 的安装目录,不做任何设置，现在退出环境变量设置。 ) ) //http://sourceforge.net/projects/jregistrykey/ //import ca.beq.util.win32.registry.*; //import java.util.*;

1.打开键

RegistryKey r = new RegistryKey(RootKey.HKEY_LOCAL_MACHINE, "SOFTWARE//Microsoft//Windows//CurrentVersion//Explorer//Shell Folders");

2.添加键

RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies"); r.create();

3.写入字符串值

RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies"); RegistryValue v = new RegistryValue("myVal", ValueType.REG_SZ, "data"); r.setValue(v);

4.获取DWORD值

RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies"); if(r.hasValue("myValue")) { RegistryValue v = r.getValue("myValue"); v.setType(ValueType.REG_DWORD); } // if

53.选择文件夹对话框

/* import java.io.*; import javax.swing.*; */ JFileChooser chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(".")); chooser.setFileFilter(new javax.swing.filechooser.FileFilter() { public boolean accept(File f) { return f.getName().toLowerCase().endsWith(".gif") || f.isDirectory(); } public String getDescription() { return "GIF Images"; } }); int r = chooser.showOpenDialog(null); if (r == JFileChooser.APPROVE_OPTION) { String name = chooser.getSelectedFile().getPath(); // label.setIcon(new ImageIcon(name)); }

54.删除空文件夹

//import java.io.*; File f=new File(%%1); if (isFolerNull(f)) { for (File file :f.listFiles()) { if (file.list().length == 0) { System.out.println(file.getPath()); file.delete(); } } }

55.发送数据到剪贴板

//import java.awt.*; //import java.awt.datatransfer.*; Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard(); Transferable tText = new StringSelection(%%1); clipboard.setContents(tText, null);

56.从剪贴板中取数据

//import java.awt.*; //import java.awt.datatransfer.*; // 取得系统剪贴板里可传输的数据构造的Java对象 Transferable t = Toolkit.getDefaultToolkit() .getSystemClipboard().getContents(null); try { if (t != null && t.isDataFlavorSupported(DataFlavor.stringFlavor)) { // 因为原系的剪贴板里有多种信息, 如文字, 图片, 文件等 // 先判断开始取得的可传输的数据是不是文字, 如果是, 取得这些文字 String s = (String) t .getTransferData(DataFlavor.stringFlavor); // 同样, 因为Transferable中的DataFlavor是多种类型的, // 所以传入DataFlavor这个参数, 指定要取得哪种类型的Data. System.out.println(s); } } catch (UnsupportedFlavorException ex) { ex.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); }

57.获取文件路径的父路径

复制代码代码如下:String %%2=%%1.substring(0,%%1.lastIndexOf("//"));

58.创建快捷方式

//import java.io.*; try { PrintWriter pw=new PrintWriter(new FileOutputStream("C:/a.bat")); pw.println(%%1);"C:/a.txt" pw.close(); } catch(IOException e){ e.printStackTrace(); }

59.弹出快捷菜单

//MouseEvent e JPopupMenu jpm=new JPopupMenu(); show(jpm,x,y);

60.文件夹复制到整合操作

/* import java.io.*; import java.util.*; import javax.swing.*; */ JFileChooser Jfc = new JFileChooser("请选择源路径"); // 建立选择档案对话 //方块盒 Jfc if (!Jfc.isFileSelectionEnabled()) { return; } String %%1 = Jfc.getSelectedFile().getParent(); Jfc = new JFileChooser("请选择目标路径"); // 建立选择档案对话方块盒 Jfc if (!Jfc.isFileSelectionEnabled()) { return; } String %%2 = Jfc.getSelectedFile().getParent(); LinkedList<String> folderList = new LinkedList<String>(); folderList.add(%%1); LinkedList<String> folderList2 = new LinkedList<String>(); folderList2.add(%%2+ %%1.substring(%%1.lastIndexOf("//"))); while (folderList.size() > 0) { (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在则建立新文件夹 File folders = new File(folderList.peek()); String[] file = folders.list(); File temp = null; try { for (int i = 0; i < file.length; i++) { if (folderList.peek().endsWith(File.separator)) { temp = new File(folderList.peek() + File.separator + file[i]); } else { temp = new File(folderList.peek() + File.separator + file[i]); } if (temp.isFile()) { FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream( folderList2.peek() + File.separator + (temp.getName()).toString()); byte[] b = new byte[5120]; int len; while ((len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if (temp.isDirectory()) {// 如果是子文件夹 for (File f : temp.listFiles()) { if (f.isDirectory()) { folderList.add(f.getPath()); folderList2.add(folderList2.peek() + File.separator + f.getName()); } } } } } catch (Exception e) { //System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } folderList.removeFirst(); folderList2.removeFirst(); }

61.文件夹移动到整合操作

62.目录下所有文件夹复制到整合操作

63.目录下所有文件夹移动到整合操作

64.目录下所有文件复制到整合操作

65.目录下所有文件移动到整合操作

66.对目标压缩文件解压缩到指定文件夹

/* import java.io.*; import java.util.*; import javax.swing.*; */

67.创建目录副本整合操作

/* import java.io.*; import java.util.*; import javax.swing.*; */ JFileChooser Jfc = new JFileChooser("请选择源路径"); // 建立选择档案对话方块盒 Jfc if (!Jfc.isFileSelectionEnabled()) { return; } String %%1 = Jfc.getSelectedFile().getParent(); Jfc = new JFileChooser("请选择目标路径"); // 建立选择档案对话方块盒 Jfc if (!Jfc.isFileSelectionEnabled()) { return; } String %%2 = Jfc.getSelectedFile().getParent();

68.打开网页

//import java.io.*; try{ String command = "C://Program Files//Internet Explorer//Iexplore.exe "+%%1; Runtime.getRuntime().exec(command); } catch (IOException ex) { ex.printStackTrace(); }

69.删除空文件夹整合操作

/* import java.io.*; import java.util.*; import javax.swing.*; */

70.获取磁盘所有分区后再把光驱盘符去除(用"/0"代替)，把结果放在数组allfenqu[] 中，数组中每

个元素代表一个分区盘符，不包括 :// 这样的路径，allfenqu[]数组开始时存放的是所有盘符。

当我用这样的代码测试结果是正确的，光驱盘符会被去掉：

String root; //root代表盘符路径 for(i=0;i<20;i++) //0-20代表最大的盘符数 { root.Format("%c://",allfenqu[i]); if(GetDriveType(root)==5) allfenqu[i]='/0'; } 但我用这样的代码时结果却无法去掉光驱盘符，allfenqu[]中还是会包含光驱盘符： String root; for(i=0;i<20;i++) { root=allfenqu[i]+"://"; if(GetDriveType(root)==5) allfenqu[i]='/0'; }

71.激活一个程序或程序关联的文件

//import java.io.*; try { Runtime.getRuntime().exec(%%1); } catch (IOException e) { e.printStackTrace(); }

72.HTTP下载

public class DownloadCSVFileAction extends Action{ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { try { String fileName = request.getParameter( "fileName "); long maID = Long.parseLong(request.getParameter( "maID ")); String filePath = request.getSession().getServletContext ().getRealPath( "/ ")+ "csv/ "+maID+ "/ "+fileName; File fdown = new File(filePath); int filelength = Integer.parseInt(String.valueOf (fdown.length())); //下载类型 response.setContentType( "application/text;charset=GB2312 "); response.setHeader( "Content-Dispositon ", "attachment;filename= 销售详细记录.csv "); //销售详细记录.csv是我想要的下载文件的文件名,但是下载对话框中显示的是 downLoadCSVFile.do response.setContentLength(filelength); byte b[]=new byte[filelength]; FileInputStream fi=new FileInputStream(fdown); OutputStream o=response.getOutputStream(); int n = 0; while((n=fi.read(b))!=-1) { o.write(b,0,n); } fi.close(); o.close(); return null; }catch (Exception e) { request.setAttribute( "ERROR ", e); return mapping.findForward( "error "); } } }

对应的下载类型

private String getContentType(String fileName) { String fileNameTmp = fileName.toLowerCase(); String ret = ""; if (fileNameTmp.endsWith("txt")) { ret = "text/plain"; } if (fileNameTmp.endsWith("gif")) { ret = "image/gif"; } if (fileNameTmp.endsWith("jpg")) { ret = "image/jpeg"; } if (fileNameTmp.endsWith("jpeg")) { ret = "image/jpeg"; } if (fileNameTmp.endsWith("jpe")) { ret = "image/jpeg"; } if (fileNameTmp.endsWith("zip")) { ret = "application/zip"; } if (fileNameTmp.endsWith("rar")) { ret = "application/rar"; } if (fileNameTmp.endsWith("doc")) { ret = "application/msword"; } if (fileNameTmp.endsWith("ppt")) { ret = "application/vnd.ms-powerpoint"; } if (fileNameTmp.endsWith("xls")) { ret = "application/vnd.ms-excel"; } if (fileNameTmp.endsWith("html")) { ret = "text/html"; } if (fileNameTmp.endsWith("htm")) { ret = "text/html"; } if (fileNameTmp.endsWith("tif")) { ret = "image/tiff"; } if (fileNameTmp.endsWith("tiff")) { ret = "image/tiff"; } if (fileNameTmp.endsWith("pdf")) { ret = "application/pdf"; } return ret; }

73.FTP下载

/* import sun.net.ftp.FtpClient; import java.io.*; import sun.net.*; */ //如果文件在某个目录下，则加入fc.cd("foodir"); //比如要下载ftp://ftp.xx.com/index.html则： try { FtpClient fc=new FtpClient("ftp.xx.com"); fc.login("username","888888"); int ch; File fi = new File("c://index.html"); RandomAccessFile getFile = new RandomAccessFile(fi,"rw"); getFile.seek(0); TelnetInputStream fget=fc.get("index.html"); DataInputStream puts = new DataInputStream(fget); while ((ch = puts.read()) >= 0) { getFile.write(ch); } fget.close(); getFile.close(); fc.closeServer(); } catch (IOException ex) { ex.printStackTrace(); }

74.写图像到剪切板 setClipboardImage

/* import java.awt.*; import java.awt.datatransfer.*; import java.io.*; */ private final Image image; Transferable trans = new Transferable() { public DataFlavor[] getTransferDataFlavors() { return new DataFlavor[] { DataFlavor.imageFlavor }; } public boolean isDataFlavorSupported(DataFlavor flavor) { return DataFlavor.imageFlavor.equals(flavor); } public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException { if (isDataFlavorSupported(flavor)) return image; throw new UnsupportedFlavorException(flavor); } }; Toolkit.getDefaultToolkit().getSystemClipboard().setContents(trans, null);

75.从剪贴板复制图像到窗体

76.删除文件夹下的所有文件且不删除文件夹下的文件夹

希望本文所述对大家Java程序设计有所帮助。