package com.ruoyi.web.controller.tool;
 
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
/**
 * @author zhy
 * @title: HttpClientUtil
 * @projectName car_park
 * @description: http连接工具类
 * @date 2019/10/2219:23
 */
public class HttpClientUtil {
 
 
    /**
     * @param strUrl
     * @return byte[]
     * @throws
     * @description: 获取网络图片转成字节流
     * @author zhy
     * @date 2019/10/23 8:59
     */
    public static byte[] getImageFromNetByUrl(String strUrl) {
        if (!isURL(strUrl)){
            return null;
        }
        try {
            URL url = new URL(strUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(2 * 1000);
            InputStream inStream = conn.getInputStream();// 通过输入流获取图片数据
            byte[] btImg = readInputStream(inStream);// 得到图片的二进制数据
            return btImg;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    /**
     * 从输入流中获取字节流数据
     *
     * @param inStream 输入流
     * @return
     * @throws Exception
     */
    public static byte[] readInputStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[10240];
        int len = 0;
        while ((len = inStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, len);
        }
        inStream.close();
        return outStream.toByteArray();
    }
 
    public static boolean isURL(String str) {
        str = str.toLowerCase();
        String regex = "^((https|http|ftp|rtsp|mms)?://)"
                + "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?"
                + "(([0-9]{1,3}\\.){3}[0-9]{1,3}"
                + "|"
                + "([0-9a-z_!~*'()-]+\\.)*"
                + "([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\\."
                + "[a-z]{2,6})"
                + "(:[0-9]{1,5})?"
                + "((/?)|"
                + "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$";
        return str.matches(regex);
    }
 
 
}