package com.numberplate.numberplateserver.api;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.commons.codec.binary.Base64;


public class Base64Util {

    public static void main(String[] args) {
        String filePath = "http://numberplate.ga/FnKBR8XiWwGC_VLGOMA4z7QZgsnJ";//待处理的图片
        System.out.println(GetImageStrFromUrl(filePath));//转换后的base64字符串
    }
        /**
         * 将一张网络图片转化成Base64字符串
         * @param imgURL
         * @return
         */
    public static String GetImageStrFromUrl(String imgURL) {
        ByteArrayOutputStream data = new ByteArrayOutputStream();
        try {
            // 创建URL
            URL url = new URL(imgURL);
            byte[] by = new byte[1024];
            // 创建链接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5000);
            InputStream is = conn.getInputStream();
            // 将内容读取内存中
            int len = -1;
            while ((len = is.read(by)) != -1) {
                data.write(by, 0, len);
            }
            // 关闭流
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 对字节数组Base64编码
        Base64 encoder = new Base64();
        return encoder.encodeToString(data.toByteArray());
    }

}