动手写一个java版简单云相册,实现的功能是：
用户可以一次上传一个至多个文件。
用户可以下载其他人上传的图片。
用户可以查看其他所有人的图片。
用户只能删除通过自己IP上传的图片。
用到的技术：
文件上传下载、设计模式、Dom4j、xPath等。
先看下2个页面：
源代码：
web.xml:
<"1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <servlet> <servlet-name>UploadServlet</servlet-name> <servlet-class>cn.hncu.servlets.UploadServlet</servlet-class> </servlet> <servlet> <servlet-name>cloudPhotoServlet</servlet-name> <servlet-class>cn.hncu.servlets.cloudPhotoServlet</servlet-class> </servlet> <servlet> <servlet-name>DownServlet</servlet-name> <servlet-class>cn.hncu.servlets.DownServlet</servlet-class> </servlet> <servlet> <servlet-name>DelServlet</servlet-name> <servlet-class>cn.hncu.servlets.DelServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>UploadServlet</servlet-name> <url-pattern>/upload</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>cloudPhotoServlet</servlet-name> <url-pattern>/cloudPhoto</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>DownServlet</servlet-name> <url-pattern>/servlet/DownServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>DelServlet</servlet-name> <url-pattern>/servlet/DelServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>chx云相册</title> <script type="text/javascript"> function delFile(input){ table = input.parentElement.parentElement.parentElement;//table.nodeName TBODY table.removeChild(input.parentElement.parentElement); } var t=1; function addFile(input){ tr = input.parentElement.parentElement; //alert(tr.nodeName); var str = "<td>选择文件：</td>"+ "<td> <input type='file' name='file"+t+"'> </td> "+ "<td>文件说明：</td>"+ "<td> <input type='text' name='text"+t+"'> </td> "+ "<td> <input type='button' value='删除文件' onclick='delFile(this)'> </td>"; tr.insertAdjacentHTML("beforeBegin",str); } function move(){ window.location.href="/myPhoto/cloudPhoto"; } </script> <style type="text/css"> #font{ color:red; } </style> </head> <body> <h1><font id="font">相册上传：</font></h1> <form action="/myPhoto/upload" method="post" enctype="multipart/form-data"> <table border="1px;double;#ff0000"> <tr> <td>选择文件：</td> <td> <input type="file" name="file1"> </td> <td>文件说明：</td> <td> <input type="text" name="text1"> </td> <td> <input type="button" value="删 除 文 件"> </td> </tr> <tr> <td colspan=2> <input type="submit" value="上 传 文 件"> </td> <td colspan=3> <input type="button" value="添 加 文 件"> </td> </tr> </table> </form> <form action="/myPhoto/cloudPhoto" method="post" enctype="multipart/form-data"> <table border="1px;double;#ff0000"> <tr> <td colspan=5><input type="submit" value="进 入 云 相 册"></td> </tr> </table> </form> </body> </html>
photo.xml:
<"1.0" encoding="UTF-8"?> <photos> </photos>
MyUtils.java:
package cn.hncu.utils; import java.text.SimpleDateFormat; import java.util.Date; import java.util.UUID; public class MyUtils { /** * @return 获取UUID */ public static String getUUID(){ return UUID.randomUUID().toString().replace("-", ""); } /** * @param uuid * @return 通过uuid，获得打散后的路径 */ public static String getDir(String uuid){ String dir1 = Integer.toHexString( uuid.hashCode() & 0xf ); String dir2 = Integer.toHexString( (uuid.hashCode() & 0xf0)>>4 ); return "/"+dir1+"/"+dir2; } //日期时间格式 private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss"); /** * @return 返回的是上传的时候的日期时间 */ public static String getCurrentDateTime(){ return sdf.format(new Date()); } }
Dom4jFactory.java:
package cn.hncu.utils; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.Node; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; public class Dom4jFactory { private static Document dom=null; private static String path; //静态块！只会运行一次！特点是在类加载的时候就执行 static{ try { SAXReader sax = new SAXReader(); //因为我们的资源已经从myelipse中发布到tomcat服务器中了，所以跟原来的纯Java项目不一样了。 //利用当前类找到它的类加载器，然后通过该类加载器再去获得资源路径 path = Dom4jFactory.class.getClassLoader().getResource("photo.xml").getPath(); //getClassLoader()返回：加载此对象所表示的类或接口的类加载器 //public URL getResource(String name)返回：读取资源的 URL 对象；如果找不到该资源，或者调用者没有足够的权限获取该资源，则返回 null。 //此方法首先搜索资源的父类加载器；如果父类加载器为 null，则搜索的路径就是虚拟机的内置类加载器的路径。 //public String getPath()获取此 URL 的路径部分。 System.out.println(path); dom = sax.read(new FileInputStream(path)); } catch (FileNotFoundException e) { throw new RuntimeException(e); } catch (DocumentException e) { throw new RuntimeException(e); } } /** * @return 获取相册的Document */ public static Document getDocument(){ return dom; } /** * 进行photo.xml的保存，保存到本地 */ public static boolean save(){ try { XMLWriter w = new XMLWriter(new FileOutputStream(path)); w.write(dom); w.close(); return true; } catch (UnsupportedEncodingException e) { return false; } catch (FileNotFoundException e) { return false; } catch (IOException e) { return false; } } public static boolean del(String uuid){ Node node = dom.selectSingleNode("[@uuid='"+uuid+"']"); if(node==null){ return false; } node.getParent().remove(node); return true; } /** * 测试用 * @param args */ public static void main(String[] args){ System.out.println( getDocument() ); } }
PhotoModel.java-值对象
package cn.hncu.domain; /** * 值对象封装 * @author 陈浩翔 * 2016-7-24 */ public class PhotoModel { private String uuid;//uuid private String realName="";//图片真实文件名(上传时的文件名) private String ext;//后缀名 private String dir;//打散后的路径 private String dateTime;//上传文件的时间 private String ip;//上传者的IP private String desc;//文件的说明 public String getUuid() { return uuid; } public void setUuid(String uuid) { this.uuid = uuid; } public String getRealName() { return realName; } public void setRealName(String realName) { this.realName = realName; } public String getExt() { return ext; } public void setExt(String ext) { this.ext = ext; } public String getDir() { return dir; } public void setDir(String dir) { this.dir = dir; } public String getDateTime() { return dateTime; } public void setDateTime(String dateTime) { this.dateTime = dateTime; } public String getIp() { return ip; } public void setIp(String ip) { this.ip = ip; } public String getDesc() { return desc; } public void setDesc(String desc) { this.desc = desc; } @Override public String toString() { return "PhotoModel [uuid=" + uuid + ", realName=" + realName + ", ext=" + ext + ", dir=" + dir + ", dateTime=" + dateTime + ", ip=" + ip + ", desc=" + desc + "]"; } }
PhotoDao.java:
package cn.hncu.photoDao.Dao; import java.util.List; import cn.hncu.domain.PhotoModel; public interface PhotoDao { /** * @param photo * @return 数据的保存 */ public boolean save(PhotoModel photo); /** * @return 返回所所有的图片信息 */ public List<PhotoModel> getAll(); /** * @param uuid * @return 通过uuid 查找那个被封装的值对象 */ public PhotoModel getSingleByUuid(String uuid); /** * @param uuid * @return 通过uuid删除photos.xml中该图片的信息 */ public boolean deleteXml(String uuid); /** * @param dir * @return 通过路径删除服务器磁盘中该图片的信息 */ public boolean deleteFile(String pathFileName); }
PhotoSerImpl.java:
package cn.hncu.photoDao.impl; import java.io.File; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.Node; import cn.hncu.domain.PhotoModel; import cn.hncu.photoDao.Dao.PhotoDao; import cn.hncu.utils.Dom4jFactory; public class PhotoSerImpl implements PhotoDao{ @Override public boolean save(PhotoModel photo) { Document dom = Dom4jFactory.getDocument(); Element root = dom.getRootElement(); //添加属性 Element p = root.addElement("photo"); p.addAttribute("uuid", photo.getUuid()); p.addAttribute("realName", photo.getRealName()); p.addAttribute("dateTime", photo.getDateTime()); p.addAttribute("ip", photo.getIp()); p.addAttribute("ext", photo.getExt()); p.addAttribute("dir", photo.getDir()); p.addAttribute("desc", photo.getDesc()); return Dom4jFactory.save(); } @Override public List<PhotoModel> getAll() { List<PhotoModel> list = new ArrayList<PhotoModel>(); Document dom = Dom4jFactory.getDocument(); Element root = dom.getRootElement(); Iterator<Element> it = root.elementIterator("photo"); //通过DOM4J获得photo元素的迭代器,也可以通过xPath来找到所有的 photo //List<Node> lists = dom.selectNodes("//photo[@uuid]"); //Iterator<Node> it = lists.iterator(); while(it.hasNext()){ Element e = it.next(); PhotoModel photo = new PhotoModel(); photo.setUuid(e.attributeValue("uuid")); photo.setRealName(e.attributeValue("realName")); photo.setDateTime(e.attributeValue("dateTime")); photo.setExt(e.attributeValue("ext")); photo.setIp(e.attributeValue("ip")); photo.setDir(e.attributeValue("dir")); photo.setDesc(e.attributeValue("desc")); list.add(photo); } return list; } @Override public PhotoModel getSingleByUuid(String uuid) { List<PhotoModel> photos=getAll(); for(PhotoModel photo:photos){ if(photo.getUuid().equals(uuid)){ return photo; } } return null; } @Override public boolean deleteXml(String uuid) { Document dom = Dom4jFactory.getDocument(); Element e = (Element) dom.selectSingleNode("//photo[@uuid='"+uuid.trim()+"']"); return e.getParent().remove(e); } @Override public boolean deleteFile(String pathFileName) { try { File file = new File(pathFileName); if(file.exists()){ file.delete(); } return true; } catch (Exception e) { return false; } } }
PhotoDaoFactory.java:
package cn.hncu.photoDao.factory; import cn.hncu.photoDao.impl.PhotoSerImpl; /** * 工厂方法 * @author 陈浩翔 * 2016-7-24 */ public class PhotoDaoFactory { public static PhotoSerImpl getPhotoDao(){ return new PhotoSerImpl(); } }
上传-UploadServlet.java:
package cn.hncu.servlets; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import cn.hncu.domain.PhotoModel; import cn.hncu.photoDao.Dao.PhotoDao; import cn.hncu.photoDao.factory.PhotoDaoFactory; import cn.hncu.utils.Dom4jFactory; import cn.hncu.utils.MyUtils; public class UploadServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); response.getWriter().print("<h1>很抱歉，本页面不支持GET方式访问！！！</h1>"); response.getWriter().print("<a href='javascript:history.go(-1)'>返回上一页</a> "); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); final PrintWriter out = response.getWriter(); //防黑-非multipart表单提交 //使用上传工具的方式 boolean boo = ServletFileUpload.isMultipartContent(request); if(!boo){ out.print("<h1>不支持普通表单的提交方式！</h1>"); return; } File file = new File("d:/photoCache"); if(!file.exists()){ file.mkdir(); } DiskFileItemFactory fiFactory = new DiskFileItemFactory(1024*10,file); ServletFileUpload upload = new ServletFileUpload(fiFactory); upload.setHeaderEncoding("utf-8");//设置文件名编码 String path = getServletContext().getRealPath("/photos"); FileItem fi = null; try { List<FileItem> list = upload.parseRequest(request); PhotoModel photo = new PhotoModel();//数据封装---需要7个属性 photo.setRealName(""); int cont=0; for(FileItem f:list){ if(cont!=0 && cont%2==0 && !photo.getRealName().equals("")){ photo = new PhotoModel();//重新数据封装 } fi=f; if(fi.isFormField()){//普通表单组件 //得到文件说明 String desc = fi.getString("utf-8"); photo.setDesc(desc);//#1 }else{ //防黑3-如果在file组件中不选择文件 if(fi.getSize()==0){ photo.setRealName(""); cont++; continue; } String fileName = fi.getName(); fileName = fileName.substring( fileName.lastIndexOf("")+1);//真实文件名 photo.setRealName(fileName);//#2 String ext = fileName.substring(fileName.lastIndexOf("."));//扩展名 photo.setExt(ext);//#3 photo.setDateTime(MyUtils.getCurrentDateTime());//#4 photo.setIp( request.getRemoteAddr() );//#5 String uuid = MyUtils.getUUID(); photo.setUuid(uuid);//#6 photo.setDir( MyUtils.getDir(uuid) );//#7 //打散目录 File dFile = new File(path+photo.getDir()); if(!dFile.exists()){ dFile.mkdirs(); } fi.write(new File(path+photo.getDir()+"/"+photo.getUuid()+photo.getExt())); } cont++; if(cont%2==0 && !photo.getRealName().equals("")){ PhotoDao dao = PhotoDaoFactory.getPhotoDao(); boo = dao.save(photo); //存入磁盘-法二：FileUtils.copyInputStreamToFile(in, new File(fileName2));//※2※ 把图片文件存储到服务器硬盘 photo = new PhotoModel();//重新数据封装 } } } catch (FileUploadException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); }finally{ if(fi!=null){ fi.delete(); } if(Dom4jFactory.save()){ out.print("<h1>上传成功！</h1>"); out.print("<a href='javascript:history.go(-1)'>返回上一页</a> "); }else{ out.print("<h1>上传失败！</h1>"); out.print("<a href='javascript:history.go(-1)'>返回上一页</a> "); } } } }
显示所有文件-cloudPhotoServlet.java
package cn.hncu.servlets; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import cn.hncu.domain.PhotoModel; import cn.hncu.photoDao.Dao.PhotoDao; import cn.hncu.photoDao.factory.PhotoDaoFactory; public class cloudPhotoServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String pwd = (String) request.getParameter("pwd"); if ("chx".equals(pwd)) { doPost(request, response); } else { response.setContentType("text/html;charset=utf-8"); response.getWriter().print("<h1>很抱歉，你没有权限访问！！！</h1>"); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>CHX云相册</TITLE></HEAD>"); out.println(" <BODY>"); out.println("<table border='1px;double;#ff0000'>"); out.println("<tr>"); out.println("<td>文件名</td>"); out.println("<td>上传时间"); out.println("<td>文件</td>"); out.println("<td>文件说明</td>"); out.println("<td>操作</td> "); out.println("</tr>"); String tdWH = ""; // 显示所有图片 PhotoDao dao = PhotoDaoFactory.getPhotoDao(); List<PhotoModel> photos = dao.getAll(); for (PhotoModel photo : photos) { String fileName = photo.getRealName(); String time = photo.getDateTime(); // 输出图片 String path = request.getContextPath() + "/photos/" + photo.getDir() + "/" + photo.getUuid() + photo.getExt(); // System.out.println(path); // /myPhoto/photos//7/c/a1237a48a6aa451cb22fa78b15bafcea.jpg String img = "<a href='" + path + "'><img src='" + path + "'/></a>"; String desc = photo.getDesc(); String delStr = "<a href='/myPhoto/servlet/DelServlet" + photo.getUuid() + "'>删除</a>"; String downStr = "<a href='/myPhoto/servlet/DownServlet" + photo.getUuid() + "'>下载</a>"; out.println("<tr>"); out.println("<td " + tdWH + "> " + fileName + " </td>"); out.println("<td " + tdWH + ">" + time + "</td>"); out.println("<td " + tdWH + ">" + img + "</td>"); out.println("<td " + tdWH + ">" + desc + "</td>"); out.println("<td " + tdWH + ">" + delStr + "" + downStr + "</td>"); out.println("</tr>"); } out.println("<tr>"); out.println("</tr>"); out.println("</table>"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } }
删除文件-DelServlet.java
package cn.hncu.servlets; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import cn.hncu.domain.PhotoModel; import cn.hncu.photoDao.Dao.PhotoDao; import cn.hncu.photoDao.factory.PhotoDaoFactory; public class DelServlet extends HttpServlet { //注入 private PhotoDao dao = PhotoDaoFactory.getPhotoDao(); public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String uuid = request.getParameter("uuid"); String ip = request.getRemoteAddr(); response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); PhotoModel photo = dao.getSingleByUuid(uuid); if(photo!=null){ if(!photo.getIp().equals(ip)){ out.print("<h1>你没有权限删除这个文件！！！</h1>"); out.print("<a href='javascript:history.go(-1)'>返回上一页</a> "); return ; } //1.删除数据库中的信息 boolean boo = dao.deleteXml(uuid); if(boo){ String fileName = "photos/"+photo.getDir()+"/"+photo.getUuid()+photo.getExt(); String pathFileName = getServletContext().getRealPath(fileName); if(dao.deleteFile(pathFileName)){ //重定向到相册页面 response.sendRedirect("/myPhoto/cloudPhoto"); }else{ out.print("<h1>无法从服务器中删除，文件正在被占用！！！</h1>"); out.print("<a href='javascript:history.go(-1)'>返回上一页</a> "); } }else{ out.print("<h1>该文件已经不存在！！！</h1>"); out.print("<a href='javascript:history.go(-1)'>返回上一页</a> "); } } } }
下载文件-DownServlet.java
package cn.hncu.servlets; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import cn.hncu.domain.PhotoModel; import cn.hncu.photoDao.Dao.PhotoDao; import cn.hncu.photoDao.factory.PhotoDaoFactory; public class DownServlet extends HttpServlet { private PhotoDao dao = PhotoDaoFactory.getPhotoDao(); public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String uuid = request.getParameter("uuid"); System.out.println(uuid); PhotoModel photo = dao.getSingleByUuid(uuid); System.out.println(photo); if(photo!=null){ //设置响应头--内容接收程序--浏览器看到这个响应头，就会把它认为的下载程序打开 //(如果识别迅雷那么就会自动打开迅雷，如果没有则会打开一个“文件另存为”的对话框) response.setContentType("application/force-download"); String realName = photo.getRealName(); String agent = request.getHeader("User-Agent"); System.out.println(agent); if(agent.indexOf("Mozilla")!=-1){//火狐浏览器 response.setHeader("Content-Disposition", "attachment;filename="+ new String(realName.getBytes("GB2312"),"ISO-8859-1")); }else{ //解决中文乱码问题（只要用下面一句对文件名进行编码就行了） realName = URLEncoder.encode(realName, "utf-8");//使用指定的编码机制将字符串转换为 application/x-www-form-urlencoded 格式。 response.setHeader("Content-Disposition", "attachment;filename=""+realName+"""); //注意：“cttachment;”不能少，否则浏览器会直接在新窗口中打开 } String fileName = "photos/" + photo.getDir()+"/"+photo.getUuid()+photo.getExt(); String pathFileName = getServletContext().getRealPath(fileName); InputStream in = new FileInputStream(pathFileName); OutputStream out = response.getOutputStream(); byte buf[] = new byte[2048]; int len=0; while( (len=in.read(buf))!=-1 ){ out.write(buf, 0, len); } out.close(); in.close(); }else{ response.setContentType("text/html;charset=utf-8"); response.getWriter().println("<h1>该文件已经被删除了</h1>"); } } }
演示结果
这个我就不演示啦，图片在前面也有，所有的源码我都给了。有兴趣的可以自己取改进一下咯。
其实这个还能上传其他任意类型文件哦，因为我们没有防护后缀名的，而且我们是用字符流传输，全都不会失真(可以当云盘来处理了~~)！！
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。