Struts1文件上传下载

首先建立web项目，引入struts，这些我就不再多说。

一、现在我直接来写JSP页面。

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<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'register.jsp' starting page</title>
</head>

<body>
<h1>注册用户</h1>
<form enctype="multipart/form-data" action="/strutsFileUpandDown/register.do" method="post">
名字：<input type="text" name="name"/><br/>
头像：<input type="file" name="myphoto"/><br/>
<input type="submit" value="注册用户"/>
</form>
</body>
</html>

二、写UserForm表单和RegisterAction

UserForm:

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/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.lpq.struts.form;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

/**
* MyEclipse Struts
* Creation date: 01-21-2013
*
* XDoclet definition:
* @struts.form name="userForm"
*/
public class UserForm extends ActionForm {
private String name;
private FormFile myphoto;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public FormFile getMyphoto() {
return myphoto;
}
public void setMyphoto(FormFile myphoto) {
this.myphoto = myphoto;
}
}

三、配置相关的跳转关系。

四、文件上传业务逻辑处理。

文件上传细节问题：1.中文名字的文件 2.存在文件会覆盖

1.使用过滤器统一设置文件的编码。

过滤器代码：

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/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.lpq.struts.action;

import java.io.FileInputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

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.lpq.domain.Users;
import com.lpq.service.UserService;

/**
* MyEclipse Struts
* Creation date: 01-22-2013
*
* XDoclet definition:
* @struts.action
*/
public class DownloadFileAction extends Action {
/*
* Generated Methods
*/

/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
//获得用户名
String username = request.getParameter("user");
//获取User对象
UserService userSevice = new UserService();
Users user = userSevice.getUser(username);

response.setContentType("text/html;charset=UTF-8");
//如果文件名有中文，需要进行url编码
String filterFilename = "";
try {
filterFilename = URLEncoder.encode(user.getPhotos2(), "UTF-8");
//filterFilename = new String(user.getPhotos2().getBytes("gb2312"),"ISO8859-1");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
//设置一个头告诉浏览器有文件要下载
response.setHeader("Content-Disposition", "attachment;filename="+filterFilename);

String filePath = this.getServlet().getServletContext().getRealPath("/file");
String fileAllPath = filePath+"\"+user.getPhotos();
FileInputStream fis = null;
OutputStream os = null;
byte[] buffer = new byte[1024];
int len = 0;
try {
fis = new FileInputStream(fileAllPath);
os = response.getOutputStream();
while((len=fis.read(buffer))>0){
os.write(buffer, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
fis.close();
os.flush();
os.close();
} catch (Exception e2) {
e2.printStackTrace();
}
}
return null;
}
}

2.每次上传的文件我们使用UUID生成随机的不重复的字符串。封装成如下工具类。

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package com.lpq.utils;

import java.util.UUID;

public class MyTools {
public static String getNewFileName(String fileName){
int beginIndex = fileName.lastIndexOf(".");
String newFilename = UUID.randomUUID().toString()+fileName.substring(beginIndex);
return newFilename;
}
}

五、文件下载业务逻辑处理

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