JSP开发之Struts2实现下载功能的实例

JSP开发之Struts2实现下载功能的实例

1、Action 类

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;
  }



}

2、struts.xml

<?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>

3、web.xml

<?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>

4、JSP

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

以上就是JSP实现下载功能的实例代码，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！