配置Mysql数据库

在pom.xml添加依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.2.0</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

在application.properties添加

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/girls
spring.datasource.username=root
spring.datasource.password=chendashan
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5 
server.port=8080
server.session.timeout=10
server.tomcat.uri-encoding=UTF-8  
mybatis.configLocations= classpath:mybatis-config.xml
mybatis.mapper-locations=classpath:mapper/*.xml

建立库表省略

mapper文件

操作数据库，靠它完成。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- namespace用于绑定Dao接口 -->
<mapper namespace="com.housekeeper.dao.UserDao">
	<!-- 用用查询映射结果 -->
	<resultMap id="BaseResultMap" type="com.housekeeper.model.User" >
		<!-- column代表数据库列名，property代表实体类属性名 -->
		<result column="user_id" property="userId"/>
		<result column="user_name" property="userName"/>
		<result column="user_password" property="userPassword"/>
	</resultMap>
    <!-- 查询名字记录sql -->  
    <select id="selectUserByUserName" parameterType="String" resultMap="BaseResultMap">    
        SELECT * FROM girls_info WHERE user_name = #{userName}    
    </select>  
</mapper>

综上得知，UserDao通过映射文件mapper，执行了sql语句，返回了实体类User

UserDao接口

@Mapper
public interface UserDao {
	/**
	 * 根据user_name查询数据库
	 * (映射执行mapper文件中的sql语句selectUserByUserName)
	 * @param userName 名字
	 * @return User
	 */
	public User selectUserByUserName(String userName);
}

User实体类

public class User {
	private String userName;
	private String userPassword; 
	public String getUserName() {
		return userName;
	} 
	public void setName(String userName) {
		this.userName = userName;
	} 
	public String getUserPassword() {
		return userPassword;
	} 
	public void setPassword(String userPassword) {
		this.userPassword = userPassword;
	} 
}

逻辑结构

逻辑层在controller里处理，已知，执行Userdao的接口方法，即可操作数据库。为了更好处理逻辑分层，加入Service层，调用UserDao。在Service实现层，注入UserDao即可调用其方法。

@Service
public class UserServiceImp implements UserService { 
	@Autowired
	private UserDao userDao;//注入UserDao	
	@Override
	public User selectUserByName(String userName) {
		return userDao.selectUserByUserName(userName);
	} 
}

public interface UserService {
	/**
	 * 通过姓名查找User
	 * @param userName
	 * @return
	 */
	User selectUserByName(String useName);
}

controller

最后，controller层对外提供接口，返回查询数据结果

@Controller
public class UserController {	
	@Autowired	
	private UserService userService;//注入Service	
	@ResponseBody
	@RequestMapping(value = "/login", method = RequestMethod.POST)
    public Map<String, Object> login(@RequestParam(value = "userName", required = true) String userName,
    		@RequestParam(value = "userPassword", required = true) String userPassword) {
		Map<String,Object> result = new HashMap<String, Object>();
		User user = null;  
		String retCode = "";
        String retMsg = "";  
        if(StringUtils.isEmpty(userName) || StringUtils.isEmpty(userPassword)){  
        	retCode = "01";  
        	retMsg = "用户名和密码不能为空";  
        }else{  
            user = userService.selectUserByName(userName);  
            if(null == user){  
            	retCode = "01";  
            	retMsg = "用户不存在";  
            }else{  
                if(userPassword.equals(user.getUserPassword())){  
                	retCode = "00";  
                	retMsg = "登录成功";  
                }else{  
                	retCode = "01";  
                	retMsg = "密码有误";  
                }  
            }  
        }  
        result.put(SystemConst.retCode, retCode);  
        result.put(SystemConst.retMsg, retMsg);  
		return result;
	} 
}

girls.sql文件

SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `girls_info`
-- ----------------------------
DROP TABLE IF EXISTS `girls_info`;
CREATE TABLE `girls_info` (
  `user_id` int(11) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(30) NOT NULL,
  `user_password` varchar(10) NOT NULL,
  PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of girls_info
-- ----------------------------
INSERT INTO `girls_info` VALUES ('2', '李一', '123456');
INSERT INTO `girls_info` VALUES ('3', '陈二', '123456');
INSERT INTO `girls_info` VALUES ('4', '王三', '123456');
INSERT INTO `girls_info` VALUES ('5', '张四', '123456');
INSERT INTO `girls_info` VALUES ('6', '李五', '123456');
INSERT INTO `girls_info` VALUES ('7', 'Biligle', '123456');

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