Struts2实现文件上传下载功能（批量上传）

今天来发布一个使用Struts2上传下载的项目，

struts2为文件上传下载提供了好的实现机制，

首先，可以先看一下我的项目截图

关于需要使用的jar包，需要用到commons-fileupload-1.3.1.jar，commons-io-2.2.jar包，有想要的可以联系我，

1. 现在让我们来看一下jsp界面：（使用了js，完成批量上传的功能）

具体代码如下（NewFile.jsp）:

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 <script type="text/javascript">
 9     function addfile() {
10         var i = document.createElement("input");
11         i.setAttribute("type","file");
12         i.setAttribute("name","doc");
13         
14         var d = document.createElement("div");
15         
16         document.getElementById("ll").appendChild(i);
17         document.getElementById("ll").appendChild(d);
18     }
19 </script>
20 </head>
21 <body>
22     <form action="upload" method="post" enctype="multipart/form-data">
23     <div id="ll">
24         上传<input type="file" name="doc" /><br/>
25         </div>
26         <a href="javascript:addfile()">继续上传</a>
27         <input type="submit" value="上传" />
28     </form>
29 </body>
30 </html>

2. form表单提交至upload.action代码如下:

 1 package com.llh.action;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileOutputStream;
 6 import java.io.IOException;
 7 import java.util.Date;
 8 import java.util.Random;
 9 
10 import org.apache.struts2.ServletActionContext;
11 import org.apache.struts2.convention.annotation.Action;
12 import org.apache.struts2.convention.annotation.InterceptorRef;
13 import org.apache.struts2.convention.annotation.Result;
14 
15 import com.opensymphony.xwork2.ActionSupport;
16 
17 public class UploadAction extends ActionSupport {
18 
19     /**
20      * 
21      */
22     private static final long serialVersionUID = 1L;
23 
24     private File doc[];
25 
26     private String docFileName[];
27 
28     public File[] getDoc() {
29         return doc;
30     }
31 
32     public void setDoc(File[] doc) {
33         this.doc = doc;
34     }
35 
36     public String[] getDocFileName() {
37         return docFileName;
38     }
39 
40     public void setDocFileName(String[] docFileName) {
41         this.docFileName = docFileName;
42     }
43 
44     @Action(value = "upload", interceptorRefs = { @InterceptorRef(value = "fileUpload", params = { "allowedExtensions",
45             ".jpg,.txt", "maximumSize", "2000000" }), @InterceptorRef(value = "defaultStack") }, results = {
46                     @Result(name = "success", location = "/success.jsp"),
47                     @Result(name = "input", location = "/error.jsp") })
48     public String execute() {
49 
50         for (int i = 0; i < doc.length; i++) {
51             File doc1 = doc[i];
52             String docFileName1 = docFileName[i];
53 
54             String path = ServletActionContext.getServletContext().getRealPath("/upload/" + changeName(docFileName1));
55             FileInputStream fis = null;
56             FileOutputStream fos = null;
57             try {
58                 fis = new FileInputStream(doc1);
59                 fos = new FileOutputStream(path);
60                 byte[] b = new byte[1024];
61                 int length = fis.read(b);
62                 while (length != -1) {
63                     fos.write(b, 0, length);
64                     length = fis.read(b);
65                 }
66             } catch (IOException e) {
67                 // TODO Auto-generated catch block
68                 e.printStackTrace();
69             } finally {
70                 try {
71                     fis.close();
72                     fos.close();
73                 } catch (IOException e) {
74                     // TODO Auto-generated catch block
75                     e.printStackTrace();
76                 }
77             }
78         }
79         return SUCCESS;
80     }
81 
82     public String changeName(String oldName) {
83         int index = oldName.indexOf(".");
84         String name = oldName.substring(0, index);
85         String extension = oldName.substring(index, oldName.length());
86         Date d = new Date();
87         Random r = new Random();
88         return name + d.getTime() + r.nextInt(999999) + extension;
89 
90     }
91 
92 }