SpringMVC—文件下载

文件下载


jsp页面：
 <a href="fileDownload.do">下载</a>


Action类：
package com.cjh.action;


import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;


@Controller
public class FileDownloadAction {


@RequestMapping(value="/fileDownload" , method=RequestMethod.GET)
public void fileDownload(HttpServletRequest request , HttpServletResponse response ){
   try{
 
/** 文件存放的相对目录**/
String path = "/fileupload";
 
/**文件名，可以从数据库中取**/
           String fileName = "bobing.war";
    
            /**获得输入流**/
InputStream in= new BufferedInputStream(request.getSession().getServletContext().getResourceAsStream(path+File.separator+fileName));
         
/**存放文件的字节数组，available()返回字节数**/
byte[] buffer = new byte[in.available()];
 
/**从流中将文件读取到字节数组中**/
                        in.read(buffer);
         
                         /**关闭流**/
                         in.close();
         
                         /**转换编码**/
fileName = URLEncoder.encode(fileName, "UTF-8");
         
/**重置response**/
response.reset(); 
 
/**设置HTML头部信息**/
response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
response.addHeader("Content-Length", "" + buffer.length);  
response.setContentType("application/octet-stream;charset=UTF-8");  
 
/**获得输出流**/
OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
 
/**从字节数组中将文件写到输出流中**/
outputStream.write(buffer); 
 
/**清空输出流**/
outputStream.flush(); 
 
/***关闭输入流*/
outputStream.close();
 
}catch(Exception e){
               e.printStackTrace();
}
 
}



}