struts2下载

java代码

package com.web.action;

import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class FileDownload2Action extends ActionSupport{
    private String fileName;

    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }
    public InputStream getInputStream(){
        //文件路径
        String url="/downdir/Linux常用命令全集.CHM";
        try {
            //下载文件名
            fileName=new String("Linux常用命令全集.CHM".getBytes("GBK"),"ISO8859_1");
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return ServletActionContext.getServletContext().getResourceAsStream(url);
    }

    @Override
    public String execute() throws Exception {
        return "success";
    }
}

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.i18n.encoding" value="GBK"></constant>
    <!-- 返回的结果是流   inputname的参数是action里面的一个get+方法名
     -->
    <package name="default" extends="struts-default">
        <action name="fileDownload2" class="com.web.action.FileDownload2Action">
            <result type="stream">
                <param name="inputName">inputStream</param>
                <param name="contentDisposition">filename=${fileName}</param>
            </result>
        </action>
    </package>
</struts>

 注意：struts2下载前端页面必须是a标签