Struts2实现文件的上传和下载

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web.xml源码：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>Loadfile</display-name>
<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源码：

<?xml version="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>
    <constant name="struts.devMode" value="false" />
    
    <constant name="struts.i18n.reload" value="true" />
    
    <constant name="struts.configuration.xml.reload" value="true" />
    
    <constant name="struts.ui.theme" value="simple" />

    
    <constant name="struts.multipart.maxSize" value="10701096" />

    <package name="upload" namespace="/" extends="struts-default">
        <action name="Upload" class="action.FileUploadAction">
            <result name="success">/success.jsp</result>
            <result name="input">/index.jsp</result>
        </action>


         <action name="FileDownload" class="action.FileDownload">
           <result name="success" type="stream">
               <param name="contentType">text/plain</param>
               <param name="contentDisposition">attachment;fileName="${fileName}"</param>
               <param name="inputName">downloadFile</param>
               <param name="bufferSize">1024</param>
           </result>
       </action>
    </package>
</struts>

FileDownload.java源码：

package action;

import java.io.InputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

//文件下载
public class FileDownload extends ActionSupport{
   /**
   *
   */
   private static final long serialVersionUID = 1L;
   private String fileName;
    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }
    //返回一个输入流，作为一个客户端来说是一个输入流，但对于服务器端是一个输出流
    public InputStream getDownloadFile() throws Exception
    {

           this.fileName = "Dream.jpg" ;
           //获取资源路径
           return ServletActionContext.getServletContext().getResourceAsStream("upload/"+this.fileName) ;
        }
    @Override
    public String execute() throws Exception {
        return SUCCESS;
    }

}

FileUploadAction.java源码：

package action;
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport{
        private File myFile;
       private String myFileContentType;
       private String myFileFileName;
       private String destPath;
    /**
     *
     */
    private static final long serialVersionUID = 1L;
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
         destPath = "e:/upload/";     //目标位置
          try{
              System.out.println("Src File name: " + myFile);
              System.out.println("我的文件名"+myFileFileName);
              System.out.println("我的文件类型"+ myFileContentType);
              File destFile = new File(destPath, myFileFileName);
             FileUtils.copyFile(myFile, destFile);
          }catch(IOException e){
             e.printStackTrace();
             return ERROR;
          }
        return SUCCESS;
    }
    public File getMyFile() {
        return myFile;
    }
    public void setMyFile(File myFile) {
        this.myFile = myFile;
    }
    public String getMyFileContentType() {
        return myFileContentType;
    }
    public void setMyFileContentType(String myFileContentType) {
        this.myFileContentType = myFileContentType;
    }
    public String getMyFileFileName() {
        return myFileFileName;
    }
    public void setMyFileFileName(String myFileFileName) {
        this.myFileFileName = myFileFileName;
    }
    public String getDestPath() {
        return destPath;
    }
    public void setDestPath(String destPath) {
        this.destPath = destPath;
    }
    public static long getSerialversionuid() {
        return serialVersionUID;
    }
}

index.jsp源码：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
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">
    

</head>

<body>
<form action="Upload.action" method="post" enctype="multipart/form-data">
      <label for="myFile">你要上传的文件</label>
      <input type="file" name="myFile" /><br>

      <input type="submit" value="上传"/>
   </form>
</body>
</html>

filedownload.jsp：

<%@ 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>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">
    
</head>
<body>
    <h2>文件下载内容：</h2><br/>
    Dream.jpg:<a href="FileDownload.action">点击下载</a><br/>
</body>
</html>

success.jsp：

<%@ 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>
<title>文件上传</title>
</head>
<body>
成功
</body>
</html>

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