Struts2多文件上传原理和示例

一、创建上传文件的页面，代码如下所示

1、Struts2也可以很方便地实现多文件上传。在输入表单域增加多个文件域：multifileupload.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"%>
 2 <%@ taglib uri="/struts-tags" prefix="s" %>
 3 <html>
 4 <head>
 5     <title>多文件上传</title>
 6 </head>
 7 <body>
 8     <font color="red"><s:fielderror/></font>
 9     <form action="multiFileUpload.action" method="POST" enctype="multipart/form-data">
10         文件标题：<input type="text" name="title" size="50" value="${param.title }"/><br/>
11        <!-- 设置二个文件域,名字相同 -->
12         选择第一个文件：<input type="file" name="upload" size="50"/><br/>
13         选择第二个文件：<input type="file" name="upload" size="50"/><br/>
14        <input type="submit" value=" 上传 "/>       
15     </form>
16 </body>
17 </html>

2、在Action类中用数组来封装该多个文件域：MultiFileUploadAction.java

 1 package org.qiujy.web.struts2;
 2 import java.io.BufferedInputStream;
 3 import java.io.BufferedOutputStream;
 4 import java.io.File;
 5 import java.io.FileInputStream;
 6 import java.io.FileOutputStream;
 7 import java.io.IOException;
 8 import java.io.InputStream;
 9 import java.io.OutputStream;
10 import org.apache.struts2.ServletActionContext;
11 import com.opensymphony.xwork2.ActionSupport;
12 publicclass MultiFileUploadAction extends ActionSupport {
13     privatestaticfinalintBUFFER_SIZE = 16 * 1024;
14     // 文件标题
15     private String title;
16     // 用File数组来封装多个上传文件域对象
17     private File[] upload;
18     // 用String数组来封装多个上传文件名
19     private String[] uploadFileName;
20     // 用String数组来封装多个上传文件类型
21     private String[] uploadContentType;
22     // 保存文件的目录路径(通过依赖注入)
23     private String savePath;
24     //以下为所有属性的getter和setter。省略。。。
25     // 自己封装的一个把源文件对象复制成目标文件对象
26     privatestaticvoid copy(File src, File dst) {
27         InputStream in = null;
28         OutputStream out = null;
29         try {
30             in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE);
31             out = new BufferedOutputStream(new FileOutputStream(dst),
32                     BUFFER_SIZE);
33             byte[] buffer = newbyte[BUFFER_SIZE];
34             int len = 0;
35             while ((len = in.read(buffer)) > 0) {
36                 out.write(buffer, 0, len);
37             }
38         } catch (Exception e) {
39             e.printStackTrace();
40         } finally {
41             if (null != in) {
42                 try {
43                     in.close();
44                 } catch (IOException e) {
45                     e.printStackTrace();
46                 }
47             }
48             if (null != out) {
49                 try {
50                     out.close();
51                 } catch (IOException e) {
52                     e.printStackTrace();
53                 }
54             }
55         }
56     }
57     @Override
58     public String execute() throws Exception {
59         File[] srcFiles = this.getUpload();
60         // 处理每个要上传的文件
61         for (int i = 0; i < srcFiles.length; i++) {
62             // 根据服务器的文件保存地址和原文件名创建目录文件全路径
63             String dstPath = ServletActionContext.getServletContext()
64                     .getRealPath(this.getSavePath())
65                     + "" + this.getUploadFileName()[i];
66             File dstFile = new File(dstPath);
67             this.copy(srcFiles[i], dstFile);
68         }
69         returnSUCCESS;
70     }
71 }

3、在Struts.xml中配置只需要改变action的名称配置其余基本不需要改变什么