本文共 5264 字，大约阅读时间需要 17 分钟。

文章来源：http://blog.csdn.net/tujiyue/article/details/6537842

备注：如果不需要进度条的话，可以在uploadify.css文件中每个模块里添加：【display: none;】即可；

文件下载Action：

/**  * Struts2Test  * 顺便的文件下载的Action  */  package com.labci.struts2.action;  import java.io.FileInputStream;  import java.io.InputStream;  import java.io.OutputStream;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;  import org.apache.struts2.interceptor.ServletRequestAware;  import org.apache.struts2.interceptor.ServletResponseAware;  import com.opensymphony.xwork2.ActionSupport;  /**  * @author Bill Tu(tujiyue/iwtxokhtd)  * Jun 8, 2011[9:15:15 PM]  *  */  public class DownloadFileAction extends ActionSupport implements          ServletRequestAware, ServletResponseAware {            /**      *       */      private static final long serialVersionUID = -7448748577778248376L;      private HttpServletRequest request;      private HttpServletResponse response;      private String savePath;            @Override      public String execute() throws Exception {                    String fileName=request.getParameter("fileName");          String fullPath=getSavePath()+"//"+fileName;          fileName=new String(fileName.getBytes("utf-8"),"iso-8859-1");          InputStream is=new FileInputStream(fullPath);          int len=0;          byte []buffers=new byte[1024];          response.reset();          response.setContentType("application/x-msdownload");          response.addHeader("Content-Disposition", "attachment;filename=/""+fileName+"/"");                    //把文件内容通过输出流打印到页面上供下载          while((len=is.read(buffers))!=-1){              OutputStream os=response.getOutputStream();              os.write(buffers, 0, len);          }                    is.close();                    return SUCCESS;      }      public void setServletRequest(HttpServletRequest req) {          this.request=req;      }      public void setServletResponse(HttpServletResponse resp) {          this.response=resp;      }      @SuppressWarnings("deprecation")      public String getSavePath() {          return request.getRealPath(savePath);      }      public void setSavePath(String savePath) {          this.savePath = savePath;      }        }

文件上传Action：

/**  * Struts2Test  * 使用Struts2上传文件  */  package com.labci.struts2.action;  import java.io.File;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.util.List;  import javax.servlet.http.HttpServletRequest;  import org.apache.struts2.interceptor.ServletRequestAware;  import com.opensymphony.xwork2.ActionSupport;  /**  * @author Bill Tu(tujiyue/iwtxokhtd)  * Jun 8, 2011[8:31:01 PM]  *  */  public class UploadFileAction extends ActionSupport implements          ServletRequestAware {      /**      *       */      private static final long serialVersionUID = -1896915260152387341L;      private HttpServletRequest request;      public void setServletRequest(HttpServletRequest req) {          this.request=req;      }                  private List
   
     fileName;//这里的"fileName"一定要与表单中的文件域名相同      private List
    
      fileNameContentType;//格式同上"fileName"+ContentType      private List
     
       fileNameFileName;//格式同上"fileName"+FileName      private String savePath;//文件上传后保存的路径            public List
      
        getFileName() {          return fileName;      }        public void setFileName(List
       
         fileName) {          this.fileName = fileName;      }        public List
        
          getFileNameContentType() { return fileNameContentType; } public void setFileNameContentType(List
         
           fileNameContentType) { this.fileNameContentType = fileNameContentType; } public List
          
            getFileNameFileName() { return fileNameFileName; } public void setFileNameFileName(List
           
             fileNameFileName) { this.fileNameFileName = fileNameFileName; } @SuppressWarnings("deprecation") public String getSavePath() { return request.getRealPath(savePath); } public void setSavePath(String savePath) { this.savePath = savePath; } @Override public String execute() throws Exception { File dir=new File(getSavePath()); if(!dir.exists()){ dir.mkdirs(); } List
            
              files=getFileName(); for(int i=0;i
            
           
          
         
        
       
      
     
    
   

struts2.xml

       
         
          
          
          
              
                   
      /upload              
      
       index.jsp
                
               
                   
      /upload              
      
       index.jsp
                
           
      
   

web.xml

   
   	
      
        
     
      index.jsp
       
      
      	
     
      struts2
       	
     
        		org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter    	
       
      
      	
     
      struts2
       	
     
      *.action
       
    
   

jsp页面【去掉了原文章中的自定义标签 mce:script后】：

<%@ page language="java" contentType="text/html;charset=utf-8" pageEncoding="utf-8"%>  <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>                       
                                           
   
      
   
      
   
      
                     

只要有文件正在上传，则会出现“取消上传”按钮供取消所有上传文件

上传成功后可点相应链接进行下载：

添加待上传文件数量超过设置上传数量时的情况：

其它的操作细节不再列举。

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效果图如下：