JDBC首选工具类

在用JDBC连接数据库时可以先写一个工具类以达到方便的效果：

package com.sun.java.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
* @author Dell JDBC工具类
*/
public class JDBCUtils {

private static String url = "jdbc:mysql://localhost:3306/thr";
private static String user = "root";
private static String password = "1";

// 静态代码块加载驱动
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

// 获取连接的方法
public static Connection getConnection() throws SQLException {
return DriverManager.getConnection(url, user, password);

}

// 释放资源的方法
public static void free(ResultSet rs, PreparedStatement ps, Connection cn) {
try {
if (rs != null) {
rs.close();
}
} catch (Exception e) {
// TODO: handle exception
} finally {
try {
if (ps != null) {
ps.close();
}
} catch (Exception e2) {
// TODO: handle exception
} finally {
if (cn != null) {
try {
cn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}