JavaWeb Struts文件上传功能实现详解_Java教程-查字典教程网

摘要：一.Struts文件上传的思路之前也讲过了FileUpload这个组件，功能很强大，但是操作繁琐复杂。这次，在Strust中也对文件上传有所...

一.Struts文件上传的思路

之前也讲过了FileUpload这个组件，功能很强大，但是操作繁琐复杂。这次，在Strust中也对文件上传有所支持，并FileUpload进行了包装，用起来方便了许多。

这里涉及到了一个标签和一个类：

<html:file property="对应ActionForm中的属性名称">

用这个标签可以上传文件，但是要接收次内容必须依靠org.apache.struts.upload.FormFile

接口完成。

JavaWeb Struts文件上传功能实现详解1

二.实现

sh.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%> <%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%> <%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>sh.jsp</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <html:form action="/jsp/upload.do" method="post" enctype="multipart/form-data"> <html:file property="photo"></html:file> <html:submit value="上传"></html:submit> </html:form> </body> </html>

UploadForm.java：

package com.zyy.struts.form; import org.apache.struts.action.ActionForm; import org.apache.struts.upload.FormFile; public class UploadForm extends ActionForm { private FormFile photo; public FormFile getPhoto() { return photo; } public void setPhoto(FormFile photo) { this.photo = photo; } }

IPTimeStamp.java:

package com.zyy.util; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Random; public class IPTimeStamp { private SimpleDateFormat sdf = null; private String ip = null; public IPTimeStamp() { } public IPTimeStamp(String ip) { this.ip = ip; } public String getIPTimeRand() { StringBuffer buf = new StringBuffer(); if (this.ip != null) { String s[] = this.ip.split("."); for (int i = 0; i < s.length; i++) { buf.append(this.addZero(s[i], 3)); } } buf.append(this.getTimeStamp()); Random r = new Random(); for (int i = 0; i < 3; i++) { buf.append(r.nextInt(10)); } return buf.toString(); } public String getDate() { this.sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS"); return this.sdf.format(new Date()); } public String getTimeStamp() { this.sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS"); return this.sdf.format(new Date()); } private String addZero(String str, int len) { StringBuffer s = new StringBuffer(); s.append(str); while (s.length() < len) { s.insert(0, "0"); } return s.toString(); } public static void main(String args[]) { System.out.println(new IPTimeStamp("192.168.1.1").getIPTimeRand()); } }

UploadAction.java：

package com.zyy.struts.action; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import com.zyy.struts.form.UploadForm; import com.zyy.util.IPTimeStamp; public class UploadAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { UploadForm uploadForm = (UploadForm) form; IPTimeStamp ips = new IPTimeStamp(request.getRemoteAddr()); // 文件名 String fileName = ips.getIPTimeRand() + "." + uploadForm.getPhoto().getFileName().split(".")[uploadForm .getPhoto().getFileName().split(".").length - 1]; // 输出路径 File outFile = new File(super.getServlet().getServletContext() .getRealPath("/") + "upload" + File.separator + fileName); // 存放图片的文件夹 File file = new File(super.getServlet().getServletContext() .getRealPath("/") + "upload"); if (!file.exists()) { file.mkdir(); } InputStream input = uploadForm.getPhoto().getInputStream(); OutputStream output = new FileOutputStream(outFile); byte data[] = new byte[1024]; int temp = 0; while ((temp = input.read(data, 0, 1024)) != -1) { output.write(data); } output.close(); input.close(); return null; } }

struts-config.xml：

<"1.0" encoding="ISO-8859-1" ?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd"> <struts-config> <form-beans> <form-bean name="uploadForm" type="com.zyy.struts.form.UploadForm"></form-bean> </form-beans> <global-exceptions> </global-exceptions> <global-forwards> </global-forwards> <action-mappings> <action path="/jsp/upload" attribute="uploadForm" input="/jsp/sh.jsp" name="uploadForm" scope="request" type="com.zyy.struts.action.UploadAction"> </action> </action-mappings> <message-resources parameter="resource.MessageResources" /> </struts-config>

JavaWeb Struts文件上传功能实现详解2

由于我保存在的是super.getServlet().getServletContext().getRealPath("/")+ "upload"

这是虚拟目录的真实路径的upload文件夹下。

JavaWeb Struts文件上传功能实现详解3

由此可见，在Struts中的文件上传原理和FileUpload一样，但是Struts进行了包装，所以用起来明显比单独用FileUpload组件方便了许多。

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