一、Demo介紹
基于struts2架構，實作多檔案的上傳和下載下傳功能。
實作原理圖：
部分界面圖：
上傳成功及下載下傳頁面：
二、主要代碼
uploadFile.jsp:在form表單中包含一個文本框（上傳使用者的姓名）和兩個檔案上傳選項.
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>多檔案上傳</title>
</head>
<body>
<center>
<s:form action="docUpload" method="post" enctype="multipart/form-data">
<s:textfield name="name" label="姓名" size="20"/>
<s:file name="upload" label="選擇文檔" size="20"/>
<s:file name="upload" label="選擇文檔" size="20"/>
<s:submit value="确認上傳" align="center"/>
</s:form>
</center>
</body>
</html>
struts.xml:分别配置了上傳和下載下傳的Action（DocUploadAction和DocDownloadAction）。在檔案上傳時，做了一些簡單的過濾。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
<constant name="struts.i18n.encoding" value="utf-8"/>
<package name="default" extends="struts-default">
<action name="docUpload" class="com.cy.action.DocUploadAction">
<!-- 使用fileUpload攔截器 -->
<interceptor-ref name="fileUpload">
<!-- 指定允許上傳的檔案大小最大為50000位元組 -->
<param name="maximumSize">50000</param>
</interceptor-ref>
<!-- 配置預設系統攔截器棧 -->
<interceptor-ref name="defaultStack"/>
<!-- param子元素配置了DocUploadAction類中savePath屬性值為/upload -->
<param name="savePath">/upload</param>
<result>/showFile.jsp</result>
<!-- 指定input邏輯視圖，即不符合上傳要求，被fileUpload攔截器攔截後，傳回的視圖頁面 -->
<result name="input">/uploadFile.jsp</result>
</action>
<action name="docDownload" class="com.cy.action.DocDownloadAction">
<!-- 指定結果類型為stream -->
<result type="stream">
<!-- 指定下載下傳檔案的檔案類型 text/plain表示純文字 -->
<param name="contentType">
application/msword,text/plain
</param>
<!-- 指定下載下傳檔案的入口輸入流 -->
<param name="inputName">inputStream</param>
<!-- 指定下載下傳檔案的處理方式與檔案儲存名 attachment表示以附件形式下載下傳，也可以用inline表示内聯即在浏覽器中直接顯示，預設值為inline -->
<param name="contentDisposition">
attachment;filename="${downloadFileName}"
</param>
<!-- 指定下載下傳檔案的緩沖區大小，預設為1024 -->
<param name="bufferSize">40960</param>
</result>
</action>
</package>
</struts>
DocUploadAction.java：采用數組方式實作多檔案上傳。
package com.cy.action;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class DocUploadAction extends ActionSupport {
private String name;
private File[] upload;
private String[] uploadContentType;
private String[] uploadFileName;
private String savePath;
private Date createTime;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public File[] getUpload() {
return upload;
}
public void setUpload(File[] upload) {
this.upload = upload;
}
public String[] getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String[] getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getSavePath() {
return savePath;
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
public Date getCreateTime(){
createTime=new Date();
return createTime;
}
public static void copy(File source,File target){
InputStream inputStream=null;
OutputStream outputStream=null;
try{
inputStream=new BufferedInputStream(new FileInputStream(source));
outputStream=new BufferedOutputStream(new FileOutputStream(target));
byte[] buffer=new byte[];
int length=;
while((length=inputStream.read(buffer))>){
outputStream.write(buffer, , length);
}
}catch(Exception e){
e.printStackTrace();
}finally{
if(null!=inputStream){
try {
inputStream.close();
} catch (IOException e2) {
e2.printStackTrace();
}
}
if(null!=outputStream){
try{
outputStream.close();
}catch(Exception e2){
e2.printStackTrace();
}
}
}
}
@Override
public String execute() throws Exception {
for(int i=;i<upload.length;i++){
String path=ServletActionContext.getServletContext().getRealPath(this.getSavePath())+"\\"+this.uploadFileName[i];
File target=new File(path);
copy(this.upload[i],target);
}
return SUCCESS;
}
}
showFile.jsp：對上傳的檔案設定了超連結，供下載下傳使用。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>顯示上傳文檔</title>
</head>
<body>
<center>
<font style="font-size:18px;color:red">上傳者：<s:property value="name"/></font>
<table width="45%" cellpadding="0" cellspacing="0" border="1">
<tr>
<th>檔案名稱</th>
<th>上傳者</th>
<th>上傳時間</th>
</tr>
<s:iterator value="uploadFileName" status="st" var="doc">
<tr>
<td align="center">
<a href="docDownload.action?downPath=upload/<s:property value="#doc"/>">
<s:property value="#doc"/>
</a>
</td>
<td align="center"><s:property value="name"/></td>
<td align="center"><s:date name="createTime" format="yyyy-MM-dd HH:mm:ss"/></td>
</tr>
</s:iterator>
</table>
</center>
</body>
</html>
三、注意事項
1、實作檔案上傳與下載下傳功能，必須在uploadFile.jsp頁面中form表單中設定enctype=”multipart/form-data”屬性。
2、所有form表單中action=“xxx”屬性，其中xxx必須與struts.xml中配置的action的name值完全一緻。
3、在form表單中設定屬性enctype=”multipart/form-data”的情況下，如何擷取表單中送出的文本值？具體實作方法見http://blog.csdn.net/u012829611/article/details/70072569
4、一個struts.xml檔案中可以配置多個action，在配置過程中需要與第二點注意事項相結合。
5、這裡隻列出部分主要代碼，如需完整Demo代碼，可到http://download.csdn.net/my下載下傳
轉載請注明！謝謝！