javaWeb中在servlet中response下载图片

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);

}

}