JSP
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<a href="download.action?fileName=1.zip">下载</a>
<br>
</body>
</html>
Action
package action;
import java.io.InputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class DownloadAction extends ActionSupport{
private String path;
private String fileName;
//此处省略set和get方法
public InputStream getInputStream(){//此方法与struts.xml中的配置对应
InputStream ins=null;
/*try {//获取引用物理路径文件的输入流
ins=new FileInputStream(new File(path+"/"+fileName));
} catch (FileNotFoundException e) {
e.printStackTrace();
}*/
//获取引用服务器逻辑路径文件的输入流
ins=ServletActionContext.getServletContext().getResourceAsStream(path+"/"+fileName);
return ins;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
}
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN" "http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
<package name="downfile2" extends="struts-default">
<action name="download" class="action.DownloadAction">
<!-- action静态参数，指定下载的文件路径，Web资源路径 -->
<param name="path">/files</param>
<!-- 使用StreamResult结果类型 -->
<result type="stream">
<!-- 指定下载的文件内容类型 -->
<param name="contentType">application/octet-stream</param>
<!-- Action用于读取文件内容的属性名，如果是inputStream，可以缺省 -->
<param name="inputName">inputStream</param>
<!-- 下载方式设置（inline-直接打开，attachment-打开对话框），默认文件名 -->
<param name="contentDisposition">attachment;filename=${fileName}</param>
<param name="bufferSize">1024</param>
</result>
</action>
</package>
</struts>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<display-name>DownFile2</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>