Java jdbc到配置单元的连接被拒绝
我正在尝试通过jdbc连接到hive。下面是我正在使用的代码:Java jdbc到配置单元的连接被拒绝,java,sql,hadoop,jdbc,hive,Java,Sql,Hadoop,Jdbc,Hive,我正在尝试通过jdbc连接到hive。下面是我正在使用的代码: import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.sql.Connection; public class HiveToJava { private static String driverName = "org.apac
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Connection;
public class HiveToJava {
private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";
/**
* @param args
* @throws SQLException
*/
public static void main(String[] args) throws SQLException {
try {
Class.forName(driverName);
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.exit(1);
}
Connection con = DriverManager.getConnection(
"jdbc:hive://localhost:10000/default", "", "");
Statement stmt = con.createStatement();
String tableName = "processed";
ResultSet res = stmt.executeQuery("describe " + tableName);
while (res.next()) {
System.out.println(res.getString(1) + "\t" + res.getString(2));
}
}
}
当我将此类作为Java应用程序运行时,我得到以下消息:
主线程java.sql.SQLException中的异常:无法建立
与本地主机的连接:10000/默认值:java.net.ConnectException:
拒绝连接
请帮助。尝试下面的代码,您可能会得到输出
package com.services.connections;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class ConnectHive
{
public static void main(String[] args) throws SQLException,ClassNotFoundException
{
// TODO Auto-generated method stub
String connectionURL = "jdbc:hive://localhost:9999/javatesting";
String drivername = "org.apache.hadoop.hive.jdbc.HiveDriver";
String username = "";
String password = "";
try {
Class.forName(drivername);
}
catch (ClassNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
System.exit(1);
}
try {
Connection con = DriverManager.getConnection(connectionURL, username, password);
if(con != null)
{
System.out.println("Connected");
}
else
{
System.out.println("Not Connected");
}
Statement stmt = con.createStatement();
// select * query
String sql;
ResultSet res;
sql = "select * from javatesting.testdata";
System.out.println("Running: " + sql);
res = stmt.executeQuery(sql);
while (res.next())
{
System.out.println(String.valueOf(res.getString(1)) + "\t" + res.getString(2));
}
}
catch(SQLException se)
{
se.printStackTrace();
}
}
}
是否确定不需要凭据看起来可能是端口错误、服务器未运行、凭据错误,或者您有防火墙问题。我解决了上述问题。问题是我没有启动hiveserver。我的错。