Struts2 框架实现多文件上传下载

web.xml配置:
[xhtml] view plaincopyprint?<?xmlversion="1.0"encoding="UTF-8"?>

<web-appversion="2.5"

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_2_5.xsd">
<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<filter>

<filter-name>struts2</filter-name>

<filter-class>

org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

</filter-class>

</filter>

<filter-mapping>

<filter-name>struts2</filter-name>

<url-pattern>*.action</url-pattern>

</filter-mapping>

</web-app>

struts.xml配置:
[xhtml] view plaincopyprint?<?xmlversion="1.0"encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

<constantname="struts.i18n.encoding"value="utf-8"/>

<packagename="file"extends="struts-default">

<actionname="showUpload">

<result>/upload.jsp</result>

</action>

<actionname="upload"class="com.boxun.hzw.action.UploadAction">

<resultname="input">/upload.jsp</result>

<result>/download.jsp</result>

<interceptor-refname="fileUpload">

<paramname="maximumSize">2097152</param>

<paramname="addowedTypes">image/bmp,image/jpg</param>

</interceptor-ref>

<interceptor-refname="defaultStack"></interceptor-ref>

</action>

<actionname="download"class="com.boxun.hzw.action.DownloadAction">

<resultname="success"type="stream">

<paramname="contentDisposition">attachment;filename="${fileName}"</param>

<paramname="inputName">downloadFile</param>

</result>

</action>

</package>

</struts>

后台实体类代码：
[java] view plaincopyprint?package com.boxun.hzw.bean;

publicclass UploadFiles {

private String uploadContentType;

private String uploadFileName;

private String uploadRealName;

public String getUploadContentType() {

return uploadContentType;

}

publicvoid setUploadContentType(String uploadContentType) {

this.uploadContentType = uploadContentType;

}

public String getUploadFileName() {

return uploadFileName;

}

publicvoid setUploadFileName(String uploadFileName) {

this.uploadFileName = uploadFileName;

}

public String getUploadRealName() {

return uploadRealName;

}

publicvoid setUploadRealName(String uploadRealName) {

this.uploadRealName = uploadRealName;

}

}

上传Action类：
[java] view plaincopyprint?package com.boxun.hzw.action;

import java.io.*;

import java.util.ArrayList;

import java.util.List;

import java.util.UUID;

import org.apache.commons.io.FileUtils;

import org.apache.struts2.ServletActionContext;

import com.boxun.hzw.bean.UploadFiles;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("all")

publicclass UploadAction extends ActionSupport {

privatestaticfinallong serialVersionUID = 1L;

private File[] upload; //实际上传文件

private String[] uploadContentType; //文件的内容类型

private String[] uploadFileName; //上传文件名

private List<UploadFiles> uploadFiles = new ArrayList<UploadFiles>();

public String execute(){

String targetDirectory = ServletActionContext.getServletContext().getRealPath("/"+"images/");//获得路径

for(int i = 0 ; i < upload.length ; i++){

String fileName = uploadFileName[i]; //上传的文件名

String type = uploadContentType[i]; //文件类型

String realName = UUID.randomUUID().toString() +

getExt(fileName); //保存的文件名称、使用UUID+后缀进行保存

File target = new File(targetDirectory,realName);

try {

FileUtils.copyFile(upload[i],target);//上传至服务器的目录

} catch (IOException e) {

e.printStackTrace();

return INPUT;

}

//把路径()写入数据库 ---省略---

UploadFiles uf = new UploadFiles(); //创建文件

uf.setUploadContentType(type);

uf.setUploadFileName(fileName);

uf.setUploadRealName(realName);

uploadFiles.add(uf); //添加到需要下载文件的List集合中

}

ServletActionContext.getRequest().setAttribute("uploadFiles", uploadFiles);

return SUCCESS;

}

public File[] getUpload() {

return upload;

}

publicvoid setUpload(File[] upload) {

this.upload = upload;

}

public String[] getUploadContentType() {

return uploadContentType;

}

publicvoid setUploadContentType(String[] uploadContentType) {

this.uploadContentType = uploadContentType;

}

public String[] getUploadFileName() {

return uploadFileName;

}

publicvoid setUploadFileName(String[] uploadFileName) {

this.uploadFileName = uploadFileName;

}

public List<UploadFiles> getUploadFiles() {

return uploadFiles;

}

publicvoid setUploadFiles(List<UploadFiles> uploadFiles) {

this.uploadFiles = uploadFiles;

}

publicstaticlong getSerialversionuid() {

return serialVersionUID;

}

publicstatic String getExt(String fileName){

return fileName.substring(fileName.lastIndexOf("."));

}

}

下载Action类：
[java] view plaincopyprint?package com.boxun.hzw.action;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("all")

publicclass DownloadAction extends ActionSupport {

privatestaticfinallong serialVersionUID = 6329383258366253255L;

private String fileName;

private String fileRealName;

publicvoid setFileName(){

//得到请求下载的文件名

String fname = ServletActionContext.getRequest().getParameter("name");

String frealname = ServletActionContext.getRequest().getParameter("realname");

try {

/*

* 对fname参数进行utf-8解码、注意：实际进行utf-8解码时会使用本地编码、本机为GBK。

* 这里使用reqeust.setCharacterEncoding解码无效.

* 只有解码了getDownloadFile()方法才能在下载目录下正确找到请求的文件

*/

fname = new String(fname.getBytes("ISO-8859-1"),"utf-8");

frealname = new String(frealname.getBytes("ISO-8859-1"),"utf-8");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

this.fileName = fname;

this.fileRealName = frealname;

}

/*

* @getFileName 此方法对应的是struts.xml文件中的:

* <param name ="contentDisposition"> attachment;filename="${fileName}"</param>

* 这个属性设置的是下载工具下载文件时显示的文件名、要想正确的显示中文文件名，

* 我们需要对fileName再次编码

* 否则中文名文件将出现乱码、或无法下载情况

* @return

*/

public String getFileName(){

try {

fileRealName = new String (fileRealName.getBytes(),"ISO-8859-1");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return fileRealName;

}

/*

* @getDownloadFile 此方法对应的是Struts.xml文件中的：

* <param name="inputName">downloadFile</param>

* 返回下载文件的流、可以参看Struts2的源码

*/

public InputStream getDownloadFile(){

this.setFileName();

return ServletActionContext.getServletContext().getResourceAsStream("/"+"images/"+fileRealName);

}

@Override

public String execute() throws Exception{

return SUCCESS;

}

}

上传jsp页面：

[xhtml] view plaincopyprint?<%@ page language="java"import="java.util.*"pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<basehref="<%=basePath%>">

<title>My JSP 'upload.jsp' starting page</title>

<metahttp-equiv="pragma"content="no-cache">

<metahttp-equiv="cache-control"content="no-cache">

<metahttp-equiv="expires"content="0">

<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">

<metahttp-equiv="description"content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">

-->

</head>

<body>

<formaction="upload.action"method="post"enctype="multipart/form-data">

<table>

<tr>

<td>上传文件</td>

<td>标题：<inputtype="text"name="uploadFileName"/>

<inputtype="file"name="upload"/><br/>

标题：<inputtype="text"name="uploadFileName"/>

<inputtype="file"name="upload"/><br/>

标题：<inputtype="text"name="uploadFileName"/>

<inputtype="file"name="upload"/><br/>

标题：<inputtype="text"name="uploadFileName"/>

<inputtype="file"name="upload"/><br/>

标题：<inputtype="text"name="uploadFileName"/>

<inputtype="file"name="upload"/>

</td>

</tr>

<tr>

<td><inputtype="submit"value="提交"/></td>

<td><inputtype="reset"value="重置"/></td>

</tr>

</table>

</form>

</body>

</html>

下载jsp页面：
[xhtml] view plaincopyprint?<%@ page language="java"import="java.util.*"pageEncoding="UTF-8"%>

<%@ taglib prefix="c"uri="http://java.sun.com/jsp/jstl/core" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<basehref="<%=basePath%>">

<title>My JSP 'download.jsp' starting page</title>

<metahttp-equiv="pragma"content="no-cache">

<metahttp-equiv="cache-control"content="no-cache">

<metahttp-equiv="expires"content="0">

<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">

<metahttp-equiv="description"content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">

-->

</head>

<body>

<c:forEachitems="${uploadFiles}"var="files">

<imgsrc="images/${files.uploadRealName }"mce_src="images/${files.uploadRealName }"alt="ds"width="200px"height="300px"/>

<ahref="download.action?name=${files.uploadFileName }&realname=${files.uploadRealName }"mce_href="download.action?name=${files.uploadFileName }&realname=${files.uploadRealName }">${files.uploadFileName }</a><br/>

</c:forEach>

</body>

</html>