servlet下载文件例子

来源：互联网发布：dfx设计 java 编辑：程序博客网时间：2024/05/17 06:52

package com.test;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HSR extends HttpServlet {
   public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       //通过路径得到一个输入流
       String path =    this.getServletContext().getRealPath("/WEB-INF/classes/1.jpg");
       FileInputStream fis = new FileInputStream(path);
       //创建字节输出流
       ServletOutputStream sos = response.getOutputStream();

       //得到要下载的图片文件名
       String filename = path.substring(path.lastIndexOf("\\"+1));


       //告诉客户端需要下载图片（通过响应消息头）
       response.setHeader("content-disposition", "attachment;filename="+filename);

       //告诉客户端下载文件的类型
       response.setHeader("content-type", "image/jpeg");

       //执行输出操作
       int len = 1;
       byte[] b = new byte[1024];
       while((len=fis.read(b)) != -1){
           sos.write(b,0,len);
       }
       sos.close();
       fis.close();

   }

   public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       doGet(request,response);
   }

}

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