Struts2 文件下载

action类：

package com.ly.action;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;public class FileDown {    private InputStream inputStream;//输入流    private String fileName;//文件名    public InputStream getInputStream() {        return inputStream;    }    public void setInputStream(InputStream inputStream) {        this.inputStream = inputStream;    }    public String getFileName() {        return fileName;    }    public void setFileName(String fileName) {        this.fileName = fileName;    }    public String down(){        //设置下载路径        fileName = "11.png";//已经存在的文件        String path = "d:\\a\\" + fileName;        try {            inputStream = new FileInputStream(path);        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return "down";    }}

struts.xml配置文件

 <action name="down" class="com.ly.action.FileDown" method="down">     <result  name="down" type="stream">        <param name="inputName">inputStream</param>        <param name="contentType">application/octet-stream</param>        <param name="contentDisposition">attachment;            filename="${fileName}"        </param>     </result> </action>

**1. result type 为stream
2. param参数inputName，下载文件来源流，对应action中某个类型的
inputStream的属性名，该属性必须有getInputStream()方法
3. contentType 内容类型，和互联网中MIME表中一致
4. contentDisposition 文件下载的处理方式，包括内联(inline)和
(attachment),inline浏览器试图直接打开附件， attachment打开对话框。**