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Java连接PostgresSQL代码示例：
添加maven依赖：

        <dependency>            <groupId>org.postgresql</groupId>            <artifactId>postgresql</artifactId>            <version>9.4.1209.jre7</version>        </dependency>

示例代码：

import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.Statement;public class PostgresJDBCTest {    public static void main(String[] args)throws Exception {        Class.forName("org.postgresql.Driver");        String url = "jdbc:postgresql://ip地址:端口号/数据库名称?currentSchema=模式名城";        String username = "用户名";        String password="密码";        Connection connection = DriverManager.getConnection(url,username,password);        String sql = "select count(1) from ad.test ";        Statement statement = connection.prepareStatement(sql);        ResultSet rs = statement.executeQuery(sql);        while(rs.next()){            int result = rs.getInt(1);            System.out.println(result);        }    }}