JSP开发之Struts2实现下载功能的实例

package com.favccxx.strutsdemo; 
 
import java.io.file; 
import java.io.fileinputstream; 
import java.io.inputstream; 
 
import com.opensymphony.xwork2.actionsupport; 
 
public class downloadaction extends actionsupport { 
 
   
  private static final long serialversionuid = -7758584364932001138l; 
   
  private inputstream inputstream; 
 
  @override 
  public string execute() throws exception { 
     inputstream = new fileinputstream(new file("d:\芒果豆.jpg")); 
     return success; 
  } 
 
  public inputstream getinputstream() { 
    return inputstream; 
  } 
 
  public void setinputstream(inputstream inputstream) { 
    this.inputstream = inputstream; 
  } 
   
   
 
} 

<?xml version="1.0" encoding="utf-8" ?> 
<!doctype struts public 
  "-//apache software foundation//dtd struts configuration 2.3//en" 
  "http://struts.apache.org/dtds/struts-2.3.dtd"> 
 
<struts> 
 
  <constant name="struts.enable.dynamicmethodinvocation" value="false" /> 
  <constant name="struts.devmode" value="true" /> 
 
  <package name="default" namespace="/" extends="struts-default"> 
 
    <default-action-ref name="index" /> 
 
    <global-results> 
      <result name="error">/error.jsp</result> 
    </global-results> 
 
    <global-exception-mappings> 
      <exception-mapping exception="java.lang.exception" result="error"/> 
    </global-exception-mappings> 
 
    <action name="index"> 
      <result type="redirectaction"> 
        <param name="actionname">helloworld</param> 
        <param name="namespace">/example</param> 
      </result> 
    </action> 
     
    <action name="download" class="com.favccxx.strutsdemo.downloadaction"> 
      <result name="success" type="stream"> 
        <param name="contenttype">application/octet-stream</param> 
        <param name="inputname">inputstream</param> 
        <param name="contentdisposition">attachment;filename="mongo.jpg"</param> 
        <param name="buffersize">1024</param> 
      </result> 
    </action> 
  </package> 
 
</struts> 

<?xml version="1.0" encoding="utf-8"?> 
<web-app id="webapp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" 
  xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" 
  xsi:schemalocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 
 
  <display-name>struts blank</display-name> 
 
  <filter> 
    <filter-name>struts2</filter-name> 
    <filter-class>org.apache.struts2.dispatcher.ng.filter.strutsprepareandexecutefilter</filter-class> 
  </filter> 
 
  <filter-mapping> 
    <filter-name>struts2</filter-name> 
    <url-pattern>/*</url-pattern> 
  </filter-mapping> 
 
  <welcome-file-list> 
    <welcome-file>index.html</welcome-file> 
  </welcome-file-list> 
 
</web-app> 

<a href="/download" rel="external nofollow" >无注解下载</a>