java 通过 url 获取网络图片 并转换为 base64 字符串

import org.jsoup.Jsoup;
import org.jsoup.nodes.Element;
import org.springframework.stereotype.Service;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;
import java.util.Map;

public String imageChangeBase64(String imagePath){
        ByteArrayOutputStream outPut = new ByteArrayOutputStream();
        byte[] data = new byte[1024];
        try {
            // 创建URL
            URL url = new URL(imagePath);
            // 创建链接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(10 * 1000);

            if(conn.getResponseCode() != 200) {
                return "fail";//连接失败/链接失效/图片不存在
            }
            InputStream inStream = conn.getInputStream();
            int len = -1;
            while ((len = inStream.read(data)) != -1) {
                outPut.write(data, 0, len);
            }
            inStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 对字节数组Base64编码
        byte[] encode = Base64.getEncoder().encode(outPut.toByteArray());
        String res = new String(encode);
        return res;

　　

 

注意导入的包  一开始包导错了  导致报错