struts2文件下载的实现

http://elf8848.iteye.com/blog/640964

http://elf8848.iteye.com/blog/275823

struts2.xml配置：

1         <action name="ExportDB" class="edu.xjtu.sei.xxxx.action.DBManager.ExportDBAction">

2             <result name="success" type="stream">

3                 <param name="contentType">application/octet-stream</param>

4                 <param name="inputName">inputStream</param>                

5                 <param name="bufferSize">409600</param>

6                 <param name="contentDisposition">attachment;filename="${filename}"</param>

7                 <param name=""></param>

8             </result>    

9         </action > 

ExportDBAction.java

import java.io.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.Date;

import java.util.Iterator;

import java.util.List;



import org.apache.struts2.json.annotations.JSON;

import com.opensymphony.xwork2.ActionSupport;



import edu.xjtu.sei.xxx.business.dao.HostInfectDAO;

import edu.xjtu.sei.xxx.util.DateUtils;



public class ExportDBAction extends ActionSupport{

    String filename;

    String flag;

    String errormessage;

    String properties;

    

    private HostInfectDAO hostinfectdao;

   public void setHostInfectDAO(HostInfectDAO hostinfectdao) {

        this.hostinfectdao = hostinfectdao;

    }

    

public String getProperties() {

        return properties;

    }

    public void setProperties(String properties) {

        this.properties = properties;

    }

    boolean success;

    public String execute() {


        success=true;

        return SUCCESS;   
                

        }

    public String getFilename() {

        return filename;

    }

    public void setFilename(String filename) {

        this.filename = filename;

    }

    public String getFlag(){

        return flag;

    }

    public void setFlag(String flag){

        this.flag=flag;

    }

    public String getErrormessage() {

        return errormessage;

    }

    public void setErrormessage(String errormessage) {

        this.errormessage = errormessage;

    }

    public boolean isSuccess() {

        return success;

    }

    public void setSuccess(boolean success) {

        this.success = success;

    }

    public InputStream getInputStream() throws IOException {

        List results=null;

        StringBuilder export=new StringBuilder();

        results=hostinfectdao.getExportDB(flag);

        export.append("IP,域名,时间"+"\n");

        for (Iterator iter = results.iterator(); iter.hasNext();) {

            Object[] row=(Object[]) iter.next();            

            String ip=row[0].toString();

            String dns=row[1].toString();

            String time=DateUtils.formatDateEx((Date)row[3]).toString();            

            export.append(ip+","+dns+","+time+"\n");

        }

        ByteArrayInputStream stream = new ByteArrayInputStream(export.toString().getBytes("gbk"));   

        return stream; 

        

        }

    

    public static void main(String args[]) throws IOException{

        ExportDBAction a=new ExportDBAction();

        a.setProperties("1");

        a.getInputStream();

    }

}

请求action的js函数:

function exportTable(filename,flag){

        //window.location.href = "ExportDB.action?filename="+filename+".csv&flag="+flag+"&contentType=application/octet-stream";

　　　　 window.location.href = "ExportDB.action?filename="+filename+".csv&flag="+flag;
    }

之前IE浏览器下载的时候一直自动打开文件。
那时struts.xml里的<param name="contentDisposition">attachment;filename="${filename}"</param>

是这样写的：<param name="contentDisposition">filename="${filename}"</param>

后来把attachment加上就好了。

参考文章说的很清楚：

要直接下载一个文件，我们需要做两件事，

第一件事是：设定响应的内容类为“application/octet-stream”，大小写无关。

第二件事是：设置HTTP的响应头名字为：Content-Disposition，设定值为：attachment;   filename   =   theFileName。这里的theFileName就是出现在文件下载对话框里的默认文件名，通常和所下载的文件名字相同，但也可以不同。

jsp页面的实现代码：

html代码：

      <%  

      //   得到文件名字和路径  

      String   filename   =   "MengxianhuiDocTest.doc";  

      String   filepath   =   "D:\\";  

       

      //   设置响应头和下载保存的文件名  

      response.setContentType("APPLICATION/OCTET-STREAM");  

      response.setHeader("Content-Disposition",  

      "attachment;   filename=\""   +   filename   +   "\"");  

     

      //   打开指定文件的流信息  

      java.io.FileInputStream   fileInputStream   =  

      new   java.io.FileInputStream(filepath   +   filename);  

         

      //   写出流信息  

      int   i;  

      while ((i=fileInputStream.read())   !=   -1)   {  

        out.write(i);  

      }  

      fileInputStream.close();  

      out.close();  

    %>