本文实例讲述了Java使用JDBC连接postgresql数据库。分享给大家供大家参考，具体如下：

package tool;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

public class PsqlConnectionTool {

private String url = "jdbc:postgresql://xxx.xxx.xxx.xxx:5432/testdb";

private String username = "postgres";

private String password = "postgres";

private Connection connection = null;

public Connection getConn() {

try {

Class.forName("org.postgresql.Driver").newInstance();

connection = DriverManager.getConnection(url, username, password);

} catch (InstantiationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalAccessException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return connection;

}

public ResultSet query(Connection conn, String sql) {

PreparedStatement pStatement = null;

ResultSet rs = null;

try {

pStatement = conn.prepareStatement(sql);

rs = pStatement.executeQuery();

} catch (SQLException e) {

e.printStackTrace();

}

return rs;

}

public boolean queryUpdate(Connection conn, String sql) {

PreparedStatement pStatement = null;

int rs = 0;

try {

pStatement = conn.prepareStatement(sql);

rs = pStatement.executeUpdate();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

if (rs > 0) {

return true;

}

return false;

}

public static void main(String[] args) throws SQLException {

PsqlConnectionTool pgtool = new PsqlConnectionTool();

Connection myconn = pgtool.getConn();

pgtool.queryUpdate(myconn, "insert into test values (1,'smoon','man')");

ResultSet rs = pgtool.query(myconn, "select * from test");

while(rs.next()){

int id = rs.getInt("id");

String name = rs.getString("name");

String gender = rs.getString("gender");

System.out.println("id:"+id+" 姓名："+name+" 性别："+gender);

myconn.close();

}

}

}

希望本文所述对大家java程序设计有所帮助。