springboot整合juit

先看一眼包路径，发现main程序的路径和测试类的路径是一样的
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启用新注解：@SpringBootTest代替了之前sm整合juit时的

@RunWith(SpringJUnit4ClassRunner.class)
//spring配置类
@ContextConfiguration(classes = config.class)

新的如此：之前的配置类都是自己创建的，现在不用自己创建了，都是springboot自动创建，所以这里就可以进行注解的替换

package com.itjh;

import com.itjh.service.BookService;
import com.itjh.service.BookServiceIm;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class Springboot01ApplicationTests {

    @Autowired
    private BookService bookService;
    @Test
    public void a() {
        bookService.show();
    }
}

业务层：接口和实现了

package com.itjh.service;

public interface BookService {
    public void show();
}

package com.itjh.service;

import org.springframework.stereotype.Service;

@Service
public class BookServiceIm implements BookService{
    public void show(){
        System.out.println("BookServiceIm  执行了。。。。");
    }
}

当main程序的路径和测试类的路径是不一样时，就需要添加参数：表明main程序是哪一个


@SpringBootTest(classes = Springboot01Application.class)
class Springboot01ApplicationTests {

    @Autowired
    private BookService bookService;

springboot整合mybatis

创建工程的时候只需要勾选出mybatis.....``sql.....即可

将之前的spring配置类，加载接口，从properties文件中获得数据源，获得操作数据源的sqlsession简化了，只需要写出接口和数据源所需要的url，password等即可，对了，这里的sql语句是写在了注解上面
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接口：接口上加注解@Mapper，表示代替之前sm整合时的加载mapper所在包的操作

package com.itjh.mapper;

import com.itjh.pojo.Book;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface Dao {
    @Select("select * from tbl_book where id = #{id}")
    public List<Book> selectOne(int id);
}

配置文件：其中写上数据源：

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

实体类：

package com.itjh.pojo;

public class Book {
    private String name;
    private Integer id;
    private String description;
    private String type;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", id=" + id +
                ", description='" + description + '\'' +
                ", type='" + type + '\'' +
                '}';
    }
}

测试类：不用动

package com.itjh;

import com.itjh.mapper.Dao;
import com.itjh.pojo.Book;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class Springboot02ApplicationTests {

    @Autowired
    private Dao dao;
    @Test
    void contextLoads() {
        List<Book> list=dao.selectOne(1);
        System.out.println(list);
    }

}