springboot基本使用八（mbatisplus+filter实现登录功能）

mybatisplus依赖：

<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.2</version>
</dependency>

mysql依赖：

<dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><scope>runtime</scope>
</dependency>

 lombox依赖：

<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional>
</dependency>

数据库表数据：

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (`id` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '唯一标识',`nickname` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '用户名称'
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('843232', '李哪吒');
INSERT INTO `user` VALUES ('994343', '杨戬');SET FOREIGN_KEY_CHECKS = 1;

前端：

    html:

<div class="whole"><ul class="user_login"><li><label>id：</label><input type="text" name="id"  /></li><li><label>姓名：</label><input type="text" name="nickname" class="name" /><span          class="prompt_mes"></span></li><li><span class="bnt_login">登录</span></li></ul></div>

    css:

 <style>*{margin: 0;padding: 0;}ul{list-style: none;}.whole{margin: 0 auto;height: 200px;width: 500px;border: 1px solid #000000;}.user_login li{height: 50px;margin: 10px 0;position: relative;