SpringBoot启动报错Consider defining a bean of type ‘com.test.springmvc.dao.xx‘ in your configuration.

报错信息如下：

Description:Field userDao in com.test.springmvc.service.impl.UserServiceImpl required a bean of type 'com.test.springmvc.dao.UserDao' that could not be found.The injection point has the following annotations:- @org.springframework.beans.factory.annotation.Autowired(required=true)Action:Consider defining a bean of type 'com.test.springmvc.dao.UserDao' in your configuration.

报错截图：

项目目录结构：

SpringBootApplication启动类和controller、service、dao包同一级才能扫描到
在保证目录结构没问题的情况下：

1.检查自己的依赖MyBatis相关依赖是否齐全

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.0</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.test</groupId><artifactId>springmvc</artifactId><version>0.0.1-SNAPSHOT</version><name>springmvc</name><description>SpringMVCPractice</description><properties><java.version>1.8</java.version></properties><dependencies><!--MyBatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.13</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.10</version></dependency><!--lombok--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>2.6.0</version></dependency></dependencies></project>

2.配置文件是否配置了jdbc信息和MyBatis的别名和包扫描

#端口
server.port=8080#jdbc配置
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/testdb09?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root#MyBatis
mybatis.mapper-locations=classpath:com/test/dao/*.xml
mybatis.type-aliases-package=com.test.domain

并检查对应的Mapper文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.test.springmvc.dao.UserDao"><select id="findALL" resultType="com.test.springmvc.domain.User">select *from user</select><select id="findById" resultType="com.test.springmvc.domain.User">select *from userwhere id=#{id}</select><insert id="addUser">insert into user (name,age)values (#{name},#{age})</insert><delete id="delUserById">deletefrom  userwhere id=#{id}</delete><update id="updateUser">update userset name=#{name},age=#{age}where id=#{id}</update></mapper>

3.最后查看controller、service和dao是否添加了对用的注解。尤其是dao接口上的注解，要加上@Mapper这个ibatis的注解

package com.test.springmvc.dao;import com.test.springmvc.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;import java.util.List;@Repository
@Mapper
public interface UserDao {/*** 查询全部User** @return*/List<User> findALL();/*** 根据id查询User** @param id* @return*/User findById(int id);/*** 新增User** @param user* @return*/Integer addUser(User user);/*** 根据id删除** @param id* @return*/Integer delUserById(int id);/*** 修改User** @param user* @return*/Integer updateUser(User user);}

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SpringBoot启动报错Consider defining a bean of type ‘com.test.springmvc.dao.xx‘ in your configuration.

报错信息如下：

报错截图：

项目目录结构：

1.检查自己的依赖MyBatis相关依赖是否齐全

2.配置文件是否配置了jdbc信息和MyBatis的别名和包扫描

3.最后查看controller、service和dao是否添加了对用的注解。尤其是dao接口上的注解，要加上@Mapper这个ibatis的注解

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