HttpURLConnection获取开启kerberos的HDFS等组件的JMX信息

    <property>
      <name>hadoop.http.authentication.type</name>
      <value>kerberos</value>
    </property>

package org.example;

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

/**
 * Hello world!
 *
 */
public class App 
{
    public static void main(String[] args) throws IOException {
        if (args.length > 0) {
            System.setProperty("java.security.auth.login.config", args[0]);
        }
        HttpURLConnection connection = null;
        URL url = new URL(args[1]);
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        InputStream is = connection.getInputStream();
        byte[] bytes = read(is);
        String str = new String(bytes);
        System.out.println("返回结果" + str);
        is.close();
    }

    public static byte[] read(InputStream inputStream) throws IOException {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int num = inputStream.read(buffer);
            while (num != -1) {
                baos.write(buffer, 0, num);
                num = inputStream.read(buffer);
            }
            baos.flush();
            return baos.toByteArray();
        } finally {
            if (inputStream != null) {
                inputStream.close();
            }
        }
    }
}

com.sun.security.jgss.krb5.initiate {
      com.sun.security.auth.module.Krb5LoginModule required
      useKeyTab=true
      useTicketCache=false
      keyTab=" /admin.keytab"
      principal="admin@HADOOP.COM";
};

java -jar admin.jar http.conf http://hadoop:50070/jmx

        System.setProperty("sun.security.spnego.debug", "true");
        System.setProperty("sun.security.krb5.debug", "true");