import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class Export {

    public static void main(String[] args) {

        String fileUrl="http://pic37.nipic.com/20140113/8800276_184927469000_2.png";

        String fileLocal="D:/home/1.png";

        try {

            downloadFile(fileUrl,fileLocal);

        } catch (Exception e) {

            System.out.println(e.getMessage());

        }

    }

    /**

     * 文件下载

     * @param fileUrl 下载路径

     * @param savePath 存放地址 示例：D:/ceshi/1.png

     * @throws Exception

     */

    public static void downloadFile(String fileUrl,String savePath) throws Exception {

        File file=new File(savePath);

        //判断文件是否存在，不存在则创建文件

        if(!file.exists()){

            file.createNewFile();

        }

        URL url = new URL(fileUrl);

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

        urlCon.setConnectTimeout(6000);

        urlCon.setReadTimeout(6000);

        int code = urlCon.getResponseCode();

        if (code != HttpURLConnection.HTTP_OK) {

            throw new Exception("文件读取失败");

        }

        DataInputStream in = new DataInputStream(urlCon.getInputStream());

        DataOutputStream out = new DataOutputStream(new FileOutputStream(savePath));

        byte[] buffer = new byte[2048];

        int count = 0;

        while ((count = in.read(buffer)) > 0) {

            out.write(buffer, 0, count);

        }

        try {

            if(out!=null) {

                out.close();

            }

            if(in!=null) {

                in.close();

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}