postgresql数据库怎么利用Java进行连接

package test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class HelloWorld {
  public static void main(String []args) {
    Connection connection=null;
    Statement statement =null;
    try{
      String url="jdbc:postgresql://127.0.0.1:5432/postgis";
      String user="postgres";
      String password = "123456";
      Class.forName("org.postgresql.Driver");
      connection= DriverManager.getConnection(url, user, password);
      System.out.println("是否成功连接pg数据库"+connection);
      String sql="select name from test";
      statement=connection.createStatement();
      ResultSet resultSet=statement.executeQuery(sql);
      while(resultSet.next()){
        String name=resultSet.getString(1);
        System.out.println(name);
      }
    }catch(Exception e){
      throw new RuntimeException(e);
    }finally{
      try{
        statement.close();
      }
      catch(SQLException e){
        e.printStackTrace();
        throw new RuntimeException(e);
      }finally{
        try{
          connection.close();
        }
        catch(SQLException e){
          e.printStackTrace();
          throw new RuntimeException(e);
        }
      }
    }
  }
}