一、实现单个文件上传

1、创建如下web项目结构

2、在src下的com.action包下创建UploadAction.java

 package com.action;

 import java.io.File;

 import javax.servlet.ServletContext;

 import org.apache.commons.io.FileUtils;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionSupport;

 /**

  * 单个文件上传

  * @author Dell

  *

  */

 public class UploadAction extends ActionSupport {

     //封装上传文件属性==form表单中file文件域的name属性值保持一致

     private File upload;

     //封装上传文件的类型，固定语法=file文件域name属性值+ContextType;

     private String uploadContentType;

     //封装文件上传名，固定语法=file文件域name属性值+FileName

     private String uploadFileName;

     @Override

     public String execute() throws Exception {

         //获取上下文对象

         ServletContext appliaction=ServletActionContext.getServletContext();

         //获取要保存文件的位置

         String path=appliaction.getRealPath("/upload");

         //创建一个与上传同名的文件

         File file=new File(path,uploadFileName);

         //将临时文件内容拷贝到目标文件夹下的那个同名的文件

         FileUtils.copyFile(upload, file);

         //删除临时文件

         upload.delete();

         return SUCCESS;

     }

     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;

     }

 }

UploadAction.java

3、在src下创建struts.xml文件

 <?xml version="1.0" encoding="UTF-8"?>

 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "struts-2.1.dtd" >

 <struts>

       <!-- 中文乱码处理 -->

       <constant name="struts.i18n.encoding" value="UTF-8"/>

       <constant name="struts.devMode" value="true"/>

        <!-- 设置上传文件的总大小 -->

       <constant name="struts.multipart.maxSize" value="200000000"/>

       <package name="default" namespace="/" extends="struts-default">

       <!--文件上传 -->

          <action name="*" class="com.action.{1}Action" method="execute">

               <result>/success.jsp</result>

               <result name="input">/error.jsp</result>

               <interceptor-ref name="defaultStack">

                  <!-- 配置文件上传的大小，这里配置的是上传文件的单个大小 -->

                  <param name="fileUpload.maximumSize">20971520</param>

                  <!-- 配置文件上传允许的类型 -->

                  <param name="fileUpload.allowedTypes">text/plain,application/msword</param>

                  <!-- 配置文件的扩展名 -->

                  <param name="fileUpload.allowedExtensions">.txt,.doc</param>

               </interceptor-ref>

          </action>

       </package>

 </struts>

struts.xml

4、在WebRoot下创建upload文件夹

5、编辑WebRoot下的WEB-INF下的web.xml文件

 <?xml version="1.0" encoding="UTF-8"?>

 <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

     <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>/*</url-pattern>

     </filter-mapping>

     <welcome-file-list>

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

     </welcome-file-list>

 </web-app>

web.xml

6、在WebRoot下创建upload.jsp文件

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 <%@ taglib uri=  "/struts-tags" prefix="s" %>

 <%

 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>

     <base href="<%=basePath%>">

     <title>单个文件上传</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

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

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

     <!--

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

     -->

   </head>

   <body>

     <s:form action="Upload.action" enctype="multipart/form-data" method="post">

        <s:textfield name="title" label="标题"/><br/>

        <s:file name="upload" label="选择文件"/><br/>

        <s:submit name="submit" value="上传文件"/>

     </s:form>

   </body>

 </html>

upload.jsp

7、在WebRoot下创建success.jsp文件

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 <%@ taglib uri="/struts-tags" prefix="s" %>

 <%

 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>

     <base href="<%=basePath%>">

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

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

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

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

     <!--

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

     -->

   </head>

   <body>

     上传成功！

     您所上传的文件是：<s:property value="uploadFileName"/><br/>

     文件类型：<s:property value="uploadContentType"/><br/>

   </body>

 </html>

success.jsp

8、在WebRoot下创建error.jsp文件

 <%@ 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>

     <base href="<%=basePath%>">

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

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

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

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

     <!--

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

     -->

   </head>

   <body>

      操作失败！！

   </body>

 </html>

error.jsp

9、运行

二、上传多个文件

(接着上面的项目进行)

1、在src的com.action包下创建ManyUploadAction.java

 package com.action;

 import java.io.File;

 import javax.servlet.ServletContext;

 import org.apache.commons.io.FileUtils;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionSupport;

 /**

  * 多个文件上传

  * @author Dell

  *

  */

 public class ManyUploadAction extends ActionSupport {

     //封装上传文件属性==form表单中file文件域的name属性值保持一致

     private File[] upload;

     //封装上传文件的类型，固定语法=file文件域name属性值+ContextType;

     private String[] uploadContentType;

     //封装文件上传名，固定语法=file文件域name属性值+FileName

     private String[] uploadFileName;

     @Override

     public String execute() throws Exception {

            //获取上下文对象

             ServletContext appliaction=ServletActionContext.getServletContext();

             //获取要保存文件的位置

             String path=appliaction.getRealPath("/upload");

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

             //创建一个与上传同名的文件

             File file=new File(path,uploadFileName[i]);

             //将临时文件内容拷贝到目标文件夹下的那个同名的文件

             FileUtils.copyFile(upload[i], file);

             //删除临时文件

             upload[i].delete();

         }

         return SUCCESS;

     }

     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;

     }

 }

ManyUploadAction.java

2、在WebRoot下创建manyUpload.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 <%@ taglib uri=  "/struts-tags" prefix="s" %>

 <%

 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>

     <base href="<%=basePath%>">

     <title>多个文件上传</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

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

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

     <!--

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

     -->

   </head>

   <body>

     <s:form action="ManyUpload.action" enctype="multipart/form-data" method="post">

              <s:file name="upload" label="选择文件1"/><br/>

              <s:file name="upload" label="选择文件2"/><br/>

              <s:file name="upload" label="选择文件3"/><br/>

              <s:file name="upload" label="选择文件4"/><br/>

              <s:file name="upload" label="选择文件5"/><br/>

         <s:submit name="submit" value="上传文件"/><br/>

     </s:form>

   </body>

 </html>

manyUpload.jsp

3、运行

三、文件下载

(接着上面的项目进行)

1、在src下的com.action包下创建FileDownAction.java

 package com.action;

 import java.io.BufferedInputStream;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.InputStream;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionSupport;

 /**

  * 文件下载

  * @author Dell

  *

  */

 public class FileDownAction extends ActionSupport{

     //读取下载文件的目录

     private String inputPath;

     //下载文件的文件名

     private String fileName;

     //读取下载文件的输入流

     private InputStream inputStream;

     //下载文件的类型

     private String contentType;

     @Override

     public String execute() throws Exception {

         return SUCCESS;

     }

     public String getInputPath() {

         return inputPath;

     }

     public void setInputPath(String inputPath) {

         this.inputPath = inputPath;

     }

     public String getFileName() {

         return fileName;

     }

     public void setFileName(String fileName) {

         this.fileName = fileName;

     }

     //创建InputStream输入流

     public InputStream getInputStream() throws FileNotFoundException {

         //得到下载文件的实际路径

         String path=ServletActionContext.getServletContext().getRealPath(inputPath);

         //创建输入流实现文件的下载读取

         return new BufferedInputStream(new FileInputStream(path+"\\"+fileName));

     }

     public void setInputStream(InputStream inputStream) {

         this.inputStream = inputStream;

     }

     public String getContentType() {

         return contentType;

     }

     public void setContentType(String contentType) {

         this.contentType = contentType;

     }

 }

FileDownAction.java

2、编辑src下的struts.xml文件（添加文件下载的action的内容）

 <?xml version="1.0" encoding="UTF-8"?>

 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "struts-2.1.7.dtd" >

 <struts>

   <!-- 中文乱码处理 -->

   <constant name="struts.i18n.encoding" value="UTF-8"/>

   <!-- 设置开发模式 -->

   <constant name="struts.devMode" value="true"/>

   <!-- 设置上传文件的大小 -->

   <constant name="struts.multipart.maxSize" value="200000000"/>

   <package name="default" namespace="/" extends="struts-default">

       <!-- 文件上传 -->

       <action name="*" class="com.action.{1}Action" method="execute">

          <result>/success.jsp</result>

          <result name="input">/error.jsp</result>

          <!-- 引用默认拦截器栈 -->

          <interceptor-ref name="defaultStack">

             <!-- 配置上传的大小，这里配置的是上传文件的单个大小 -->

             <param name="fileUpload.maximumSize">20971520</param>

             <!-- 配置文件上传允许的类型 -->

             <!-- 图片：image/pjpeg,image/jpeg,image/gif,image/png,image/bmp -->

             <!-- 文本文件：text/plain -->

             <!-- HTML网页：text/html -->

             <!-- 可执行文件：application/octet-stream -->

             <!-- PPT:Application/vnd.ms-powerpoint -->

             <!-- Excel：Application/vnd.ms-excel -->

             <!-- Word：application/msword -->

             <param name="fileUpload.allowedTypes">text/plain,application/msword</param>

             <!-- 配置文件的扩展名 -->

             <param name="fileUpload.allowedExtensions">.txt,.doc</param>

          </interceptor-ref>

       </action>

       <!-- 文件下载 -->

          <action name="download" class="com.action.FileDownAction" method="execute">

              <!-- 配置action中使用的参数-->

              <param name="inputPath">/upload</param>

              <result name="success" type="stream">

                 <!--设置浏览器的文件类型  -->

                 <param name="contentType">application/octet-stream</param>

                 <!-- 输入流,读取 -->

                 <param name="inputStream">inputStream</param>

                 <!--设置http响应的头  -->

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

                 <!-- 设置缓冲区大小 -->

                 <param name="bufferSize">4096</param>

              </result>

          </action>

   </package>

   </struts>

struts.xml

3、在WebRoot下创建down.jsp页面

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 <%@ taglib uri=  "/struts-tags" prefix="s" %>

 <%

 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>

     <base href="<%=basePath%>">

     <title>文件下载</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

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

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

     <!--

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

     -->

   </head>

   <body>

    <a href="download.action?fileName=20140914.txt">点击此处下载20140914.txt文档</a> 

   </body>

 </html>

down.jsp

4、运行

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