《Spring Boot》springboot配置整合mybatis。

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上一篇有新建一个springboot项目，建好以后启动说是会自己生成一个application.xml和application.yaml。不知道啥原因我的没生成，自己手动建的，还有templates文件夹，如图：

1，配置文件properties和yaml

application.xml

# application.properties
# Server settings (ServerProperties)
server.port=8080
server.address=127.0.0.1
#server.sessionTimeout=30
server.contextPath=/

# Tomcat specifics
#server.tomcat.accessLogEnabled=false
server.tomcat.protocolHeader=x-forwarded-proto
server.tomcat.remoteIpHeader=x-forwarded-for
server.tomcat.basedir=
server.tomcat.backgroundProcessorDelay=30

server.port=8080，设置端口号，访问地址变成http://localhost:8080/

server.address=127.0.0.1，访问主机地址

#server.sessionTimeout=30，session失效时间

server.contextPath=/ ，访问路径，若你设置成 server.contextPath=/ test，则访问路径变为http://localhost:8080/test/

application.yaml

# application.yaml
# Server settings (ServerProperties)
server:
  port: 8080
  address: 127.0.0.1
  sessionTimeout: 30
  contextPath: /aaa

  # Tomcat specifics
  tomcat:
    accessLogEnabled: false
    protocolHeader: x-forwarded-proto
    remoteIpHeader: x-forwarded-for
    basedir:
    backgroundProcessorDelay: 30 # secs

我用的是application.yml

（提示：）

官方建议application.java放的位置：

最后尝试了下修改下Application上的注解，我本来复制官方的代码用的是@Controller和@EnableAutoConfiguration，试着换成了@SpringBootApplication注解，出乎意外的可以扫描到Controller

又查了下官方的文档终于找到原因了，原因是：

如果使用@Controller和@EnableAutoConfiguration 注解还应该再加上一个注解：@ComponentScan 就可以了。@Controller和@EnableAutoConfiguration没有扫描注解的功能，而@ComponentScan是

springboot专门用来扫描@Component, @Service, @Repository, @Controller等注解的注解

总结：

使用springboot启动类配置扫描的两种注解配置方式：

1、@Controller

　 @EnableAutoConfiguration

　 @ComponentScan

2、@SpringBootApplication

@SpringBootApplication注解等价于@Configuration, @EnableAutoConfiguration and @ComponentScan

另外application.java（启动类）也应该按照官方的建议放在root目录下，这样才能扫描到Service和dao，不然还会引起，扫描不到注解的问题。

结合mybatis的配置

application.yml

# application.yaml
# Server settings (ServerProperties)
server:
  port: 8088
  address: 127.0.0.1
  sessionTimeout: 30
  contextPath: /aaa

  # Tomcat specifics
  tomcat:
    accessLogEnabled: false
    protocolHeader: x-forwarded-proto
    remoteIpHeader: x-forwarded-for
    basedir:
    backgroundProcessorDelay: 30 # secs
    
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/government
    username: root
    password: Cx@520520
    
   
mybatis:
  type-aliases-package: cn.cx.pro.bean

这里要注意mybatis的 type-aliases-package 改成自己的bean包

这是没有配置版的。

UserMapper.class

/**
 * 
 */
/**
 * @author chenqincheng
 *
 */
package cn.cx.pro.mapper;

 
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import cn.cx.pro.bean.User;

import java.util.List;
 
// @Mapper 这里可以使用@Mapper注解，但是每个mapper都加注解比较麻烦，所以统一配置@MapperScan在扫描路径在application类中
public interface UserMapper {
 
	@Select("SELECT * FROM tb_user WHERE id = #{id}")
	User getUserById(Integer id);
 
	@Select("SELECT * FROM egov_user")
	public List<User> getUserList();
 
	@Insert("insert into tb_user(username, age, ctm) values(#{username}, #{age}, now())")
	public int add(User user);
 
	@Update("UPDATE tb_user SET username = #{user.username} , age = #{user.age} WHERE id = #{id}")
	public int update(@Param("id") Integer id, @Param("user") User user);
 
	@Delete("DELETE from tb_user where id = #{id} ")
	public int delete(Integer id);
}

UserServiceImpl.class

/**
 * 
 */
/**
 * @author chenqincheng
 *
 */
package cn.cx.pro.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cn.cx.pro.bean.User;
import cn.cx.pro.mapper.UserMapper;
import cn.cx.pro.service.UserService;

import java.util.List;
 
/**
 * @ClassName 
 * @Description
 */
@Service
public class UserServiceImpl implements UserService {
 
	@Autowired
	private UserMapper userMapper;
 
	public User getUserById(Integer id) {
		return userMapper.getUserById(id);
	}
 
	public List<User> getUserList() {
		return userMapper.getUserList();
	}
 
	public int add(User user) {
		return userMapper.add(user);
	}
 
	public int update(Integer id, User user) {
		return userMapper.update(id, user);
	}
 
	public int delete(Integer id) {
		return userMapper.delete(id);
	}
}

UserService.class

/**
 * 
 */
/**
 * @author chenqincheng
 *
 */
package cn.cx.pro.service;


import org.springframework.stereotype.Service;

import cn.cx.pro.bean.User;

import java.util.List;
 
/**
 * @ClassName 
 * @Description
 */
public interface UserService {

	 
	User getUserById(Integer id);
 
	public List<User> getUserList();
 
	public int add(User user);
 
	public int update(Integer id, User user);
 
	public int delete(Integer id);
}

JsonResult.class

package cn.cx.pro.bean;



public class JsonResult {
 
	private String status = null;
 
	private Object result = null;
 
	public JsonResult status(String status) {
		this.status = status;
		return this;
	}

	public String getStatus() {
		return status;
	}

	public void setStatus(String status) {
		this.status = status;
	}

	public Object getResult() {
		return result;
	}

	public void setResult(Object result) {
		this.result = result;
	}
 
	// Getter Setter
}

MainApplication.class

package cn.cx.pro;

 
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
@MapperScan("cn.cx.pro.mapper")
public class MainApplication {
 
	public static void main(String[] args) {
		SpringApplication.run(MainApplication.class, args);
	}
}

这里注意@MappScan里面是扫描的mapper，也就是你的接口的包路径。

现在访问http://localhost:8088/aaa/users 就能出现你的东西了，前提是你的mysql也有这张表呢

有配置版的

修改如下几个配置就可以

application.yml

# application.yaml
# Server settings (ServerProperties)
server:
  port: 8088
  address: 127.0.0.1
  sessionTimeout: 30
  contextPath: /aaa

  # Tomcat specifics
  tomcat:
    accessLogEnabled: false
    protocolHeader: x-forwarded-proto
    remoteIpHeader: x-forwarded-for
    basedir:
    backgroundProcessorDelay: 30 # secs
    
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/government
    username: root
    password: Cx@520520
    
   

mybatis:
  mapper-locations: classpath:mybatis/mapper/*.xml
  config-location: classpath:mybatis/mybatis-config.xml

加入下面的

注意你的路径maper路径和config－location路径

UserMapper.class

/**
 * 
 */
/**
 * @author chenqincheng
 *
 */
package cn.cx.pro.mapper;

 
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;

import cn.cx.pro.bean.User;

import java.util.List;
 
/**
 * @ClassName
 * @Description
 */
@Repository
public interface UserMapper {
 
	User getUserById(Integer id);
 
	public List<User> getUserList();
 
	public int add(User user);
 
	public int update(@Param("id") Integer id, @Param("user") User user);
 
	public int delete(Integer id);
}

建立如图的mybatis xml配置文件

userMapper.xml(注意你的mapper对应的namespace和实体类对于的type路径)

<?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">
<mapper namespace="cn.cx.pro.mapper.UserMapper" >
    <resultMap id="BaseResultMap" type="cn.cx.pro.bean.User" >
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="user_name" property="user_name" jdbcType="VARCHAR" />
       <!--  <result column="age" property="age" jdbcType="INTEGER" />
        <result column="ctm" property="ctm" jdbcType="TIMESTAMP"/> -->
    </resultMap>
 
    <sql id="Base_Column_List" >
        id, user_name
    </sql>
 
    <select id="getUserList" resultMap="BaseResultMap"  >
        SELECT
        <include refid="Base_Column_List" />
        FROM egov_user
    </select>
 
    <select id="getUserById" parameterType="java.lang.Integer" resultMap="BaseResultMap" >
        SELECT
        <include refid="Base_Column_List" />
        FROM tb_user
        WHERE id = #{id}
    </select>
 
    <insert id="add" parameterType="cn.cx.pro.bean.User" >
        INSERT INTO
        tb_user
        (username,age,ctm)
        VALUES
        (#{username}, #{age}, now())
    </insert>
 
    <update id="update" parameterType="java.util.Map" >
        UPDATE
        tb_user
        SET
        username = #{user.username},age = #{user.age}
        WHERE
        id = #{id}
    </update>
 
    <delete id="delete" parameterType="java.lang.Integer" >
        DELETE FROM
        tb_user
        WHERE
        id = #{id}
    </delete>
</mapper>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
    </typeAliases>
</configuration>

现在运行： http://localhost:8088/aaa/users

可出现

有什么问题可以加我weixin互相学习呢

《Spring Boot》springboot配置整合mybatis。

结合mybatis的配置

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