Struts2文件下载<*>servlet-api的方式文件下载

时间：2017-07-26 23:32:28 阅读：227 评论：0 收藏：0 [点我收藏+]

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Struts2文件下载


 1 public class DownLoadAction extends ActionSupport{
 2 
 3     private static final long serialVersionUID = 1L;
 4     //要下载的文件名
 5     private String filename;
 6     public String getFilename() {
 7         return filename;
 8     }
 9     public void setFilename(String filename) {
10         this.filename = filename;
11     }
12     
13     /**
14      * 这个方法的方法名称是由result的type的属性值对应的类的属性决定的
15      * (inputName)
16      * @throws FileNotFoundException 
17      */
18     public InputStream getInputStream() throws FileNotFoundException {
19         String path = ServletActionContext.getRequest().getRealPath("/download/");
20         return new FileInputStream(new File(path, filename));
21     }
22     
23     /**
24      * struts2里面的下载
25      * 我们实际被访问的页面只是做了一个页面跳转
26      */
27     public String stream() {
28         return SUCCESS;
29     }
30 }

struts.xml

 1 <!DOCTYPE struts PUBLIC
 2     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 3     "http://struts.apache.org/dtds/struts-2.3.dtd">
 4 <struts>
 5     <!-- 配置常量-->
 6     <!-- 配置struts2编码常量只针对post提交方式 
 7          get提交方式的乱码问题需要我们手动解决
 8     -->
 9     <constant name="struts.i18n.encoding" value="UTF-8"/>
10     <!-- 配置访问action的后缀名 -->
11     <constant name="struts.action.extension" value="action,,"/>
12     <!-- 
13         struts.devMode:struts2的开发者模式
14         在开发阶段：我们一般都会设置为true,这样我们在修改struts.xml的时候,就不用重启服务器了
15         生产环境,设置为false
16      -->
17     <constant name="struts.devMode" value="true"/>
18     <!-- 引入关联配置文件 -->
19     <include file="struts-json.xml"/>
20     <include file="struts-upload.xml"/>
21     <include file="struts-download.xml"/>
22 </struts>

struts-download.xml

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <struts>
 6     <constant name="struts.multipart.maxSize" value="1000000000"/>
 7     <package name="bamaw_download" namespace="/" extends="struts-default">
 8         <action name="stream" class="com.tbamaw.web.action.DownLoadAction">
 9             <result type="stream" name="success">
10                 <param name="contentDisposition">attachment;filename=${filename}</param>
11             </result>
12         </action>
13     </package>
14 </struts>

 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 </head>
 9 <body>
10 <a href="${pageContext.request.contextPath }/stream.action?filename=baba.jpg">下载</a>
11 </body>
12 </html>