downloadaction.java
package com.h3.common.action;
import java.io.file;
import java.io.fileinputstream;
import java.io.inputstream;
import com.opensymphony.xwork2.actionsupport;
public class downloadaction extends actionsupport{
private inputstream fileinputstream;
public inputstream getfileinputstream() {
return fileinputstream;
}
public string execute() throws exception {
fileinputstream = new fileinputstream(new file("c:\\file-for-download.txt")); return success;
}
}
downloadpage.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<body>
<h1>struts 2 download file example</h1>
<s:url id="filedownload" namespace="/" action="download" ></s:url>
<div><div class="ads-in-post hide_if_width_less_800">
<script async class="lazy" data-original="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- 728x90 - after2ndh4 -->
<ins class="adsbygoogle hide_if_width_less_800"
data-ad-client="ca-pub-2836379775501347"
data-ad-slot="3642936086"
data-ad-region="h3region"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div></div><h2>download file - <s:a href="%{filedownload}">fileabc.txt</s:a>
</h2>
</body>
</html>
定义下载文件的细节。 <param name=”inputname”> 值是从action的inputstream属性的名称。
struts.xml
<?xml version="1.0" encoding="utf-8" ?> <!doctype struts public "-//apache software foundation//dtd struts configuration 2.0//en" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.devmode" value="true" /> <package name="default" namespace="/" extends="struts-default"> <action name="show"> <result name="success">pages/downloadpage.jsp</result> </action> <action name="download" class="com.h3.common.action.downloadaction"> <result name="success" type="stream"> <param name="contenttype">application/octet-stream</param> <param name="inputname">fileinputstream</param> <param name="contentdisposition">attachment;filename="file-for-download.txt"</param> <param name="buffersize">1024</param> </result> </action> </package> </struts>
在浏览器中打开：http://localhost:8080/struts2download/
