java实现下载网络图片到本地，直接上代码

package com.example;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class DownloadPictureTest {
    public static void main(String[] args) throws Exception {
        String strs[]={"https://img2.baidu.com/it/u=2529034190,3254601958&fm=253&fmt=auto&app=120&f=JPEG?w=798&h=500"};
        for(int i=0;i<strs.length;i++){
            String durl=strs[i];
            String fileName=i+".jpg";
            download( durl, "E:\\file\\"+fileName);
            System.out.println(i);
        }

    }
    public static void download(String durl,String fileName) throws Exception {
        //定义一个URL对象，就是你想下载的图片的URL地址
        URL url = new URL(durl);
        //打开连接
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置请求方式为"GET"
        conn.setRequestMethod("GET");
        //超时响应时间为10秒
        conn.setConnectTimeout(10 * 1000);
        //通过输入流获取图片数据
        InputStream is = 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(is);
        //创建一个文件对象用来保存图片，默认保存当前工程根目录，起名叫Copy.jpg
        File imageFile = new File(fileName);
        //创建输出流
        FileOutputStream outStream = new FileOutputStream(imageFile);
        //写入数据
        outStream.write(data);
        //关闭输出流，释放资源
        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[6024];
        //每次读取的字符串长度，如果为-1，代表全部读取完毕
        int len;
        //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();
    }

}