package cn.test.net;  

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class ImageRequest {

    /**

     * @param args

     */

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

        //new一个URL对象

        URL url = new URL("http://img.hexun.com/2011-06-21/130726386.jpg");

        //打开链接

        HttpURLConnection conn = (HttpURLConnection)url.openConnection();

        //设置请求方式为"GET"

        conn.setRequestMethod("GET");

        //超时响应时间为5秒

        conn.setConnectTimeout(5 * 1000);

        //通过输入流获取图片数据

        InputStream inStream = conn.getInputStream();

        //得到图片的二进制数据，以二进制封装得到数据，具有通用性

        byte[] data = readInputStream(inStream);

        //new一个文件对象用来保存图片，默认保存当前工程根目录

        File imageFile = new File("BeautyGirl.jpg");

        //创建输出流

        FileOutputStream outStream = new FileOutputStream(imageFile);

        //写入数据

        outStream.write(data);

        //关闭输出流

        outStream.close();

    }

    public static byte[] readInputStream(InputStream inStream) throws Exception{

        ByteArrayOutputStream outStream = new ByteArrayOutputStream();

        //创建一个Buffer字符串

        byte[] buffer = new byte[1024];

        //每次读取的字符串长度，如果为-1，代表全部读取完毕

        int len = 0;

        //使用一个输入流从buffer里把数据读取出来

        while( (len=inStream.read(buffer)) != -1 ){

            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度

            outStream.write(buffer, 0, len);

        }

        //关闭输入流

        inStream.close();

        //把outStream里的数据写入内存

        return outStream.toByteArray();

    }

}