javaWeb中在servlet中response下载图片

来源：互联网发布：大数据平台架构图深度编辑：程序博客网时间：2024/06/07 05:44

package org.servlet.demo;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLEncoder;

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

/**
* 测试在servlet中，发送请求下载图片
*
* @author k.sea
*
*/
public class DownLoadImageServlet extends HttpServlet {

   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException {
       // 获取当前目录的图片路径
       // String path=this.getServletContext().getRealPath("/image/tuxing.png");
       String path=this.getServletContext().getRealPath("/image/水星.png");
       // 获取文件名
       String fileName=path.substring(path.lastIndexOf("\\")+1);
       System.out.println(fileName);
       //制定浏览器头
       //在下载的时候这里是英文是没有问题的
       //resp.setHeader("content-disposition", "attachment;fileName="+fileName);
       //如果图片名称是中文需要设置转码
       resp.setHeader("content-disposition", "attachment;fileName="+URLEncoder.encode(fileName, "UTF-8"));
       InputStream reader = null;
       OutputStream out = null;
       byte[] bytes = new byte[1024];
       int len = 0;
       try {
           // 读取文件
           reader = new FileInputStream(path);
           // 写入浏览器的输出流
           out = resp.getOutputStream();

           while ((len = reader.read(bytes)) > 0) {
               out.write(bytes, 0, len);
           }
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } finally {
           if (reader != null) {
               reader.close();
           }
           if (out != null)
               out.close();
       }

   }

   @Override
   protected void doPost(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException {
       // TODO Auto-generated method stub
       doGet(req, resp);
   }

}

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