原始http下载图片生成文件

package com.example.demo.util;

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.Base64;

public class DownLoadImg {
    public static void main(String[] args) throws IOException {
        String url = "https://gss1.bdstatic.com/9vo3dSag_xI4khGkpoWK1HF6hhy/baike/crop%3D0%2C1220%2C730%2C1000/sign=21562b92a8efce1bfe64928a9261dfef/1e30e924b899a901fdb1335212950a7b0308f5ca.jpg";
        //http下载图片
        byte[] arr = getInfo(url);
        byte[] brr = Base64.getEncoder().encode(arr);
        String str = new String(brr);
        System.out.println("落库字符串:" + str);
        //从数据库取出字符串解密 生成文件
        byte[] sss = Base64.getDecoder().decode(str.getBytes());
        File img = new File("abcd.jpg");
        img.createNewFile();
        FileOutputStream fileOutputStream = new FileOutputStream(img);
        fileOutputStream.write(sss);
        fileOutputStream.flush();
        fileOutputStream.close();
        System.out.println("生成图片完成...");
    }

    /**
     * get请求
     *
     * @param url
     * @return
     */
    public static byte[] getInfo(String url) {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        InputStream in = null;
        try {
            String urlNameString = url;
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.connect();
            in = connection.getInputStream();
            byte[] arr = new byte[2048];
            int count = 0;
            while ((count = in.read(arr)) != -1) {
                byteArrayOutputStream.write(arr, 0, count);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
            return byteArrayOutputStream.toByteArray();
        }
    }
}