关于java:Kerberos

import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.security.UserGroupInformation;import java.io.IOException;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class Kerberos {    private static String driverName = "org.apache.hive.jdbc.HiveDriver";// jdbcÇý¶¯Â·¾¶    private static String url = "jdbc:hive2://node01.bigdata.hadoop:10000/default;principal=hive/node01.bigdata.hadoop@HADOOP.COM";// hive¿âµØÖ·+¿âÃû    static {        // ÉèÖÃjvmÆô¶¯Ê±krb5µÄ¶ÁÈ¡Â·¾¶²ÎÊý        System.setProperty("java.security.krb5.conf", "krb5.conf");        // ÅäÖÃkerberosÈÏÖ¤        Configuration conf = new Configuration();        conf.setBoolean("hadoop.security.authorization", true);        conf.set("hadoop.security.authentication", "kerberos");        UserGroupInformation.setConfiguration(conf);        try {            UserGroupInformation.loginUserFromKeytab("hive/node01.bigdata.hadoop@HADOOP.COM", "hive.keytab");        } catch (IOException e) {            e.printStackTrace();        }    }    public static void main(String[] args) {        Connection conn = null;        Statement stmt = null;        try {            conn = getConn();            stmt = conn.createStatement();            String sql = "show databases";            ResultSet res = stmt.executeQuery(sql);            System.out.println("ËùÓÐ¿â:  ");            while (res.next()) {                System.out.println(res.getString(1));            }        } catch (ClassNotFoundException e) {            e.printStackTrace();            System.exit(1);        } catch (SQLException e) {            e.printStackTrace();            System.exit(1);        } finally {            try {                if (stmt != null) {                    stmt.close();                    stmt = null;                }                if (conn != null) {                    conn.close();                    conn = null;                }            } catch (SQLException e) {                e.printStackTrace();            }        }    }    private static Connection getConn() throws ClassNotFoundException, SQLException {        Class.forName(driverName);        Connection conn = DriverManager.getConnection(url);        return conn;    }}