使用Struts2实现文件的上传和下载

(一)单个文件的上传步骤:

1.拷贝jar包:commons-fileupload.jar, commons-io.jar

下载链接(文件上传.rar):http://www.cnblogs.com/withyou/admin/Files.aspx

2.JSP页面中增加form:(form属性是固定的)

<form action= "uploadAction"    enctype="multipart/form-data" method="post"  >

      姓名：<input type="text" name="uname"  /><br/>

       附件：<input type="file" name="fileUpload"  /><br/>

               <input type="submit"  value="提交" />

</form>

3.action层代码:

 public class UploadAction {

     private String uname;

     private  File fileUpload;

     private String   fileUploadFileName;//名字规范  File属性的 名字+FileName,(该属性为上传过来的文件名)

     public String execute() throws IOException{

         String path = ServletActionContext.getServletContext().getRealPath("/fileUpload/");//该path为tomcat下的webapp/工程/下

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

             String[] fielNameArray = fileUploadFileName[i].split("\\.");

             //将上传的文件存到指定路径下,UUID是为了避免文件名重复

             FileUtils.copyFile(fileUpload[i],new File(path+"\\"+UUID.randomUUID()+"."+fielNameArray[fielNameArray.length-1]));

         }

         return null;

     }

     public String getUname() {

         return uname;

     }

     public void setUname(String uname) {

         this.uname = uname;

     }

     public File[] getFileUpload() {

         return fileUpload;

     }

     public void setFileUpload(File[] fileUpload) {

         this.fileUpload = fileUpload;

     }

     public String[] getFileUploadFileName() {

         return fileUploadFileName;

     }

     public void setFileUploadFileName(String[] fileUploadFileName) {

         this.fileUploadFileName = fileUploadFileName;

     }

 }

4.补充几个java获取路径的信息
　　a.获取web服务器下的文件路径 (tomcat等服务器安装目录/webapp/工程/)
　　　　request.getRealPath("/") ;application.getRealPath("")【jsp中】 ;ServletContext().getRealPath("")

　　　　如:request.getRealPath("web.xml") 的结果为:
　　　　C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\strutsTest\web.xml

　　b.获取本地路径

　　　　this.getClass().getClassLoader().getResource("").getPath(); ＝＝/D:/workspace/strutsTest/WebRoot/WEB-INF/classes/
　　　　this.getClass().getResource("").getPath().toString(); ＝＝/D:/workspace/strutsTest/WebRoot/WEB-INF/classes/bl/

　　c.获取相对路径 :

　　　　request.getContextPath();

(二)多个文件上传步骤:

　1.拷贝jar包;

　2.jsp代码如下:

 <%@ 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 'upload.jsp' starting page</title>

     <script src="js/jquery-1.4.4.js"></script>

     <script type="text/javascript">

             /*添加附件*/

             function addFileButton(){

                 var fileStr = "<div>附件：<input type='file'  name='fileUpload' />  <input type='button' value='删除' onclick='delFileButton(this);' /><br/></div>";

                 $("#div1").append(fileStr);

             }

             /*删除附件*/

             function delFileButton(obj){

                 obj.parentNode.parentNode.removeChild(obj.parentNode);

             }

     </script>

   </head>

   <body>

            <form action= "uploadAction"    enctype="multipart/form-data"  method="post"  >

                姓名：<input type="text" name="uname"  /><br/>

                <fieldset>

                    <legend><input type="button"  value="添加附件"  onclick="addFileButton();" /></legend>

                    <div  id="div1">

                        <div>附件：<input type="file" name="fileUpload"  /><input type="button" value="删除" onclick="delFileButton(this);" /><br/></div>

                    </div>

                </fieldset>

                <input type="submit"  value="提交" />

            </form>

   </body>

 </html>

　3.action层代码:

 package com.bjsxt.struts2.action;

 import java.io.File;

 import java.io.IOException;

 import java.util.UUID;

 import org.apache.commons.io.FileUtils;

 import org.apache.struts2.ServletActionContext;

 public class UploadAction {

     private String uname;

     private  File[] fileUpload;

     private String[]   fileUploadFileName;//名字规范  File属性的 名字+FileName;

     public String execute() throws IOException{

         System.out.println("--------uname-------"+uname);

         String path = ServletActionContext.getServletContext().getRealPath("/fileUpload/");

         System.out.println(path);

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

             String[] fielNameArray = fileUploadFileName[i].split("\\.");

             FileUtils.copyFile(fileUpload[i],new File(path+"\\"+UUID.randomUUID()+"."+fielNameArray[fielNameArray.length-1]));

         }

         return null;

     }

     public String getUname() {

         return uname;

     }

     public void setUname(String uname) {

         this.uname = uname;

     }

     public File[] getFileUpload() {

         return fileUpload;

     }

     public void setFileUpload(File[] fileUpload) {

         this.fileUpload = fileUpload;

     }

     public String[] getFileUploadFileName() {

         return fileUploadFileName;

     }

     public void setFileUploadFileName(String[] fileUploadFileName) {

         this.fileUploadFileName = fileUploadFileName;

     }

 }

(三)文件下载:

1.action层代码:

 package com.bjsxt.hib.action;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.InputStream;

 import java.io.UnsupportedEncodingException;

 public class DownloadAction {

     private InputStream inputStream;

     private String fileName;

     public String execute(){

         try {

             this.inputStream = new FileInputStream("D:\\123.txt");//这里有很多处理手段满足不同需求(从数据库读取等)

             this.fileName = "哈喽.txt";

         } catch (FileNotFoundException e) {

             e.printStackTrace();

         }

         return "success";

     }

     public InputStream getInputStream() {

         return inputStream;

     }

     public void setInputStream(InputStream inputStream) {

         this.inputStream = inputStream;

     }

     /*乱码处理*/

     public String getFileName() {

         String temp=null;

         try {

             temp = new String(this.fileName.getBytes(),"ISO-8859-1");

         } catch (UnsupportedEncodingException e) {

             e.printStackTrace();

         }

         return temp;

     }

     public void setFileName(String fileName) {

         this.fileName = fileName;

     }

 }

2.struts.xml配置:

  <action name="downloadAction" class="com.bjsxt.hib.action.DownloadAction">

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

                 <!--前两行是不可变的 -->

                 <param name="contentType">application/x-download</param>

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

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

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

             </result>

 </action>

3.浏览器直接输入:http://localhost:8080/downloadAction即可访问,下载.

巴特西

使用Struts2实现文件的上传和下载

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