初學(xué)springboot+mybatis,已經(jīng)import，但是報(bào)錯(cuò)找不到包和符號(hào)，如下圖

報(bào)錯(cuò)

intellij web生成的項(xiàng)目結(jié)構(gòu)

UserController

package com.example.demo10.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.spring.mybatis.springMybatis.dao.UserMapper;
import com.spring.mybatis.springMybatis.entity.User;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    UserMapper userMapper;

    @RequestMapping(value={"/selectUserById"}, method=RequestMethod.GET)
    public User selectUserById(String id){
        User user = userMapper.selectUserById(Integer.parseInt(id));
        return user;
    }

    @RequestMapping(value={"/selectUserByName"}, method=RequestMethod.GET)
    public List<User> selectUserByName(String userName){
        return userMapper.selectUserByName(userName);
    }

    @RequestMapping(value={"/addUser"}, method=RequestMethod.POST)
    public void addUser(User user){
        userMapper.addUser(user);
    }

    @RequestMapping(value={"/updateUser"}, method=RequestMethod.POST)
    public void updateUser(User user){
        userMapper.updateUser(user);
    }

    @RequestMapping(value={"/deleteUser"}, method=RequestMethod.POST)
    public void deleteUser(String id){
        userMapper.deleteUser(Integer.parseInt(id));
    }
}

UserMapper

package com.example.demo10.dao;

import java.util.List;

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

import com.spring.mybatis.springMybatis.entity.User;

@Mapper
public interface UserMapper {

    @Select("select * from user where id = #{id}")
    public User selectUserById(int id);

    @Select("select * from user where userName = #{userName}")
    public List<User> selectUserByName(String userName);

    @Insert("insert into user(userName,userAge,userAddress) values (#{userName},#{userAge},#{userAddress})")
    public void addUser(User user);

    @Update("update user set userName=#{userName},userAge=#{userAge},userAddress=#{userAddress} where id=#{id}")
    public void updateUser(User user);

    @Delete("delete from user where id=#{id}")
    public void deleteUser(int id);

}

User

package com.example.demo10.entity;

import lombok.Getter;
import lombok.Setter;

@Setter
@Getter
public class User {

    private int id;
    private String userName;
    private int userAge;
    private String userAddress;

}

jdbc

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.spring.mybatis</groupId>
    <artifactId>springMybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springMybatis</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.1.RELEASE</version>
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

sql

后面修改

查找所有用戶

dao.UserMapper

    @Select("select * from user")
    public User selectUserAll();

controller.UserController

    @RequestMapping(value={"/selectUserAll"}, method=RequestMethod.GET)
    public User selectUserAll(){
        User user = userMapper.selectUserAll();
        return user;
    }

跨域

Demo10Application

package com.example.demo10;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;

@SpringBootApplication
public class Demo10Application extends WebMvcAutoConfiguration {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowCredentials(true)
                .allowedHeaders("*")
                .allowedOrigins("*")
                .allowedMethods("*");

    }
    public static void main(String[] args) {
        SpringApplication.run(Demo10Application.class, args);
    }


}