1 <!-- 引入struts标签 -->
 2 <%@taglib prefix="s" uri="/struts-tags"%>
 3 
 4 <!--
 5     使用struts中的<s:file></s:file>标签来选择文件。
 6     设置name属性，则提交后将传递后给后台一个name属性值(upload)的文件类型的文件。
 7     同时，将随同传递该文件的名字(uploadFileName)及文件类型(uploadContentType)
 8     表单中增加编码格式(enctype)为multipart/form-data
 9 -->
10 <form action="upload" enctype="multipart/form-data" method="post">
11     <s:file name="upload" label="Select File"/>
12     <button type="submit">Submit</button>
13 </form>

 1 <!-- 指定上传的文件暂时保存的位置 -->
 2 <constant name="struts.multipart.saveDir" value="/tmp"/>
 3 <package name="default" extends="struts-default">
 4     <!-- 上传文件action -->
 5     <action name="home">
 6         <result>/WEB-INF/content/home.jsp</result>
 7     </action>
 8     <action name="upload" class="com.wsy.action.UploadAction">
 9         <!-- 引入拦截器 -->
10         <interceptor-ref name="fileUpload">
11             <!-- 文件允许类型,可自行搜索查表,未指定则为默认所有类型 -->
12             <param name="allowedTypes">image/jpeg,image/gif,text/plain</param>
13             <!-- 文件最大大小 -->
14             <param name="maximumSize">1024*1024</param>
15         </interceptor-ref>
16         <!-- 一定要引入defaultStack,否则将无法提交数据至后台 -->
17         <interceptor-ref name="defaultStack"></interceptor-ref>
18         <!-- 上传成功,返回首页 -->
19         <result type="redirect">home.action</result>
20         <!-- 上传不成功,设置input逻辑视图,进入报错页面 -->
21         <result name="input">/WEB-INF/content/error.jsp</result>
22     </action>
23 </package>

 1 package com.wsy.action;
 2 
 3 import java.io.*;
 4 
 5 import org.apache.struts2.ServletActionContext;
 6 
 7 import com.opensymphony.xwork2.ActionSupport;
 8 
 9 public class UploadAction extends ActionSupport {
10         private File upload;                // 上传的文件
11         private String uploadContentType;    // 上传的文件的类型
12         private String uploadFileName;        // 上传的文件的名字
13         
14         public File getUpload() {
15             return upload;
16         }
17 
18         public void setUpload(File upload) {
19             this.upload = upload;
20         }
21 
22         public String getUploadContentType() {
23             return uploadContentType;
24         }
25 
26         public void setUploadContentType(String uploadContentType) {
27             this.uploadContentType = uploadContentType;
28         }
29 
30         public String getUploadFileName() {
31             return uploadFileName;
32         }
33 
34         public void setUploadFileName(String uploadFileName) {
35             this.uploadFileName = uploadFileName;
36         }
37 
38         @Override
39         public String execute() throws Exception
40         {
41             String path = ServletActionContext.getServletContext().getRealPath("/WEB-INF/uploadFiles");
42             File file = new File(path);
43 //            创建文件保存文件夹
44             if (!file.exists())
45                 file.mkdirs();
46             FileOutputStream fos = new FileOutputStream(path + File.separator + getUploadFileName());
47             FileInputStream fis = new FileInputStream(getUpload());
48             byte[] buffer = new byte[1024];
49             int len = 0;
50             while ((len = fis.read(buffer)) > 0) {
51                 fos.write(buffer , 0 , len);
52             }
53             fis.close();
54             fos.close();
55             return SUCCESS;
56         }
57 }

 1 <ol>
 2     <% 
 3     String[] filelist = (String[])request.getSession().getAttribute("filelist");
 4     if (filelist != null) {
 5         for (int i = 0; i < filelist.length; i++) {
 6     %>
 7     <li><a href="download.action?filename=<%=filelist[i]%>"><%=filelist[i]%></a></li>
 8     <%
 9         }
10     } else {
11     %>
12     <li>无文件</li>
13     <% } %>
14 </ol>

 1 <package name="download" extends="struts-default">
 2     <!-- 下载文件action -->
 3     <action name="download" class="com.wsy.action.DownloadAction">
 4         <result name="success" type="stream">
 5             <param name="contentType">image/jpeg,image/gif,text/plain</param>
 6             <!-- 获取输入流，根据值调用相应的get方法 -->
 7             <param name="inputName">targetFile</param>
 8             <!--
 9                 contentDisposition是文件下载的处理方式，包括内联(inline)和附件(attachment)，默认是inline。
10                 使用附件时这样配置：attachment;filename="文件名" 。
11             -->
12             <param name="contentDisposition">attachment;filename="${filename}"</param>
13             <param name="bufferSizbe">1024*1024</param>
14         </result>
15     </action>
16 </package>

 1 package com.wsy.action;
 2 
 3 import java.io.InputStream;
 4 
 5 import org.apache.struts2.ServletActionContext;
 6 import com.opensymphony.xwork2.ActionSupport;
 7 
 8 public class DownloadAction extends ActionSupport {
 9     private String filename;
10     
11     public String getFilename() {
12         return filename;
13     }
14 
15     public void setFilename(String filename) {
16         this.filename = filename;
17     }
18 
19     public InputStream getTargetFile() throws Exception {
20         InputStream in = ServletActionContext.getServletContext().getResourceAsStream("/WEB-INF/uploadFiles/" + this.getFilename());
21         return in;
22     }
23     
24     public String execute() throws Exception {
25         return SUCCESS;
26     }
27 }

1 public void setFilename(String filename) throws UnsupportedEncodingException {
2     this.filename = new String(filename.getBytes("ISO8859-1"), "utf-8");
3 }

1 public String getDownloadFilename() throws UnsupportedEncodingException {
2     return new String(filename.getBytes(), "ISO9959-1");
3 }

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