Java获取url地址图片

package com.listings.web.controller;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;

public class CatchPic {
     public static boolean saveUrlAs(String fileUrl, String savePath)/* fileUrl网络资源地址 */
        {  

            try {
                /* 将网络资源地址传给,即赋值给url */
                URL url = new URL(fileUrl);  

                /* 此为联系获得网络资源的固定格式用法，以便后面的in变量获得url截取网络资源的输入流 */
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                DataInputStream in = new DataInputStream(connection.getInputStream());  

                /* 此处也可用BufferedInputStream与BufferedOutputStream  需要保存的路径*/
                DataOutputStream out = new DataOutputStream(new FileOutputStream(savePath));  

                /* 将参数savePath，即将截取的图片的存储在本地地址赋值给out输出流所指定的地址 */
                byte[] buffer = new byte[4096];
                int count = 0;
                while ((count = in.read(buffer)) > 0)/* 将输入流以字节的形式读取并写入buffer中 */
                {
                    out.write(buffer, 0, count);
                }
                out.close();/* 后面三行为关闭输入输出流以及网络资源的固定格式 */
                in.close();
                connection.disconnect();
                return true;/* 网络资源截取并存储本地成功返回true */  

            } catch (Exception e) {
                System.out.println(e + fileUrl + savePath);
                return false;
            }
        }  

        public static void main(String[] args) {
            CatchPic pic = new CatchPic();/* 创建实例 */  

            //需要下载的URL
            String photoUrl = "http://photos.listhub.net/GAMLS/07442715/25?lm=20150426T002920";  

            // 截取最后/后的字符串
            String fileName = new Date().getTime()+".png";  

            //图片保存路径
            String filePath = "D:/img/";  

            /* 调用函数，并且进行传参 */
            boolean flag = pic.saveUrlAs(photoUrl, filePath + fileName);  

            System.out.println("Run ok!\n Get URL file " + flag);
            System.out.println(filePath);
            System.out.println(fileName);
        }  

}