工具类

package Jdbc_Utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;


import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JDBCUtils {
    //1.定义成员变量
    private static DataSource ds;
    static {

        try { //2.加载配置文件  获得连接池
            Properties pro = new Properties();
            pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //获得链接
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }
    //释放资源
    public static void close(Connection conn, Statement state){
        if (conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (state!=null){
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    //释放全部资源
    public static void close(ResultSet result, Connection conn, Statement state){
        if (result!=null){
            try {
                result.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (state!=null){
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    //获得连接池
    public static DataSource getDataSource(){
        return ds;
    }
}