java连接mysql数据库例子代码

记得设置时区，数据库编码在URL中，否则连接不上

    @RequestMapping(value="/record")
    public String record() {
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            String url = "jdbc:mysql://127.0.0.1/eam?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=UTF-8";
            String username = "root";
            String pass = "root";
            try {
                Connection con = DriverManager.getConnection(url, username, pass);
                Statement st = con.createStatement();
                ResultSet rs = st.executeQuery("select * from operation");
                while(rs.next()) {
                    System.out.println(rs.getInt(1));
                    System.out.println(rs.getString(2));
                    System.out.println(rs.getString(3));
                    System.out.println(rs.getString(4));
                }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                System.out.println("数据库连接失败"+e.getMessage());
            }
            
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            System.out.println("驱动程序加载失败");
        }
        System.out.println("进入record");
        return "record";
    }