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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.*;
import java.util.Base64;

public class Test {
    public static void main(String[] args) {
        try {
            PrintWriter out = null;
            BufferedReader in = null;
            String result = "";
            System.setProperty("http.proxyHost", "82.157.163.144");
            System.setProperty("http.proxyPort", "8080");
            System.setProperty("https.proxyHost", "82.157.163.144");
            System.setProperty("https.proxyPort", "8080");
            URL realUrl = new URL("https://www.ljxwtl.cn");
            // 打开和URL之间的连接
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestMethod("GET");
            // 获取URLConnection对象对应的输出流
            // flush输出流的缓冲
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(),"utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}


class BasicAuthenticator extends Authenticator {
    String userName;
    String password;

    public BasicAuthenticator(String userName, String password) {
        this.userName = userName;
        this.password = password;
    }

    /**
     * Called when password authorization is needed. Subclasses should
     * override the default implementation, which returns null.
     *
     * @return The PasswordAuthentication collected from the
     * user, or null if none is provided.
     */
    @Override
    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(userName, password.toCharArray());
    }
}

该实现方法可以放在多线程的main主线程中，依然起作用！！！

支持真正的http和真正有证书的https请求有效！！！