JAVA获取网络图片并保存到本地（随机图片接口）

 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
 import javax.net.ssl.HttpsURLConnection;

 public class FirstTest {

     public static void main(String[] args) throws Exception {
         // TODO 自动生成的方法存根

         long start=System.currentTimeMillis();
         System.out.println("开始");

         for(int i=1;i<=100;i++) {
 //            double r=(0+Math.random()*10000);
 //            System.out.println(r);
             String url="https://source.unsplash.com/random";//一个随机图片接口
 //            +(0+Math.random()*10000);可以在random后面加入一个随机数避免图片重复
             getImg(url,i);
             System.out.println("完成"+i);
         }
         long end=System.currentTimeMillis();
         System.out.println("运行时间:"+(end-start)/1000+"秒");

     }
     private static void getImg(String u,int i){
         URL url;
         try {
             url = new URL(u);
             HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
             conn.setRequestMethod("GET");
             conn.setConnectTimeout(5*1000);
             InputStream in = conn.getInputStream();
             byte[] data = readInputStream(in);
             File f = new File("C:\\Users\\Administrator\\Desktop\\img\\"+i+".jpg");
             FileOutputStream out = new FileOutputStream(f);
             out.write(data);
             out.close();
         } catch (IOException e) {
             // TODO 自动生成的 catch 块
             e.printStackTrace();
         }

     }

     private static byte[] readInputStream(InputStream ins) throws IOException {
         // TODO 自动生成的方法存根
         ByteArrayOutputStream out = new ByteArrayOutputStream();
         byte[] buffer = new byte[1024];
         int len = 0;
         while ((len = ins.read(buffer)) != -1) {
             out.write(buffer, 0, len);

         }
         ins.close();

         return out.toByteArray();
     }

 }