JAVA MySQL连接

第一步下载

http://dev.mysql.com/downloads/connector/j/

第二步，解压并将解压后的jar放入WEB-INF下的lib中

第三步  在idea中按住ctrl+shift+alt+s打开

第四步：测试代码

package test.wg.c01.test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class test {
    //JDBC驱动名以及数据库URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/wg";

   //数据库的用户名与密码
    static final String USER = "root";
    static final String PASSWORD = "123";

    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");

            System.out.println("链接数据库。。。。");
            connection = DriverManager.getConnection(DB_URL,USER,PASSWORD);

            //执行查询
            System.out.println("实例化Statement对象。。。。");
            statement = connection.createStatement();
            String sql;
            sql = "SELECT user_name,password from tbl_user";
            ResultSet resultSet = statement.executeQuery(sql);

            while (resultSet.next()){
                String userName = resultSet.getString("user_name");
                String password = resultSet.getString("password");
                System.out.println("UserName:"+userName);
                System.out.println("Password:"+password);
            }
            resultSet.close();
            statement.close();
            connection.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

显示成功