Java 从0到1搭建maven项目配置springboot并运行(加入mybatis)

本文主要是在maven+springboot基础上加入mybatis

前一篇文章是基础哈,这是这个系列 第二篇 文件,点此链接进入第一篇

1.在pom中添加mybatis依赖,添加后的pom文件如下

<?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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.3.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>demo20190328</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>demo20190328</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- 加入mybatis依赖包 -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>2.0.0</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.5</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!-- GSON包不解释哈,也可以用阿里爸爸的fastjson -->
		<dependency>
			<groupId>com.google.code.gson</groupId>
			<artifactId>gson</artifactId>
			<version>2.8.2</version>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

2.mybatis配置
①在application.properties中添加mybatis配置,添加后配置如下:
mybatis.mapper-locations指定mapper文件存放路径
mybatis.config-location指定mybatis配置文件路径

#Spring datasource
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mysql?serverTimezone=GMT%2B8&charset=utf-8&useSSL=true
server.port=8888
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.thymeleaf.cache = false

#mybatis options
mybatis.mapper-locations=classpath:/mappers/*.xml
mybatis.config-location=classpath:mybatisConfig.xml

3.创建对应的controller,service,dao层对应的类,完成后的结构如下图:
Java 从0到1搭建maven项目配置springboot并运行(加入mybatis)
具体内容如下:【这里需要注意里面的@注解】

package com.example.demo.bean;

public class UserInfo {
	private Long uuid;
	private String name;
	private Integer age;
	private String grade;
	private Integer sex;
	private String createAt;
	public Long getUuid() {
		return uuid;
	}
	public void setUuid(Long uuid) {
		this.uuid = uuid;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public String getGrade() {
		return grade;
	}
	public void setGrade(String grade) {
		this.grade = grade;
	}
	public Integer getSex() {
		return sex;
	}
	public void setSex(Integer sex) {
		this.sex = sex;
	}
	public String getCreateAt() {
		return createAt;
	}
	public void setCreateAt(String createAt) {
		this.createAt = createAt;
	}
	public UserInfo() {
		super();
	}
	
}

package com.example.demo.controller;

import java.util.List;

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

import com.example.demo.bean.UserInfo;
import com.example.demo.service.MyService;
import com.google.gson.Gson;

@Controller
@RequestMapping(value="/test")
public class MyController {

	@Autowired
	private MyService Service;
	
	@ResponseBody
	@RequestMapping(value="/hello",method=RequestMethod.GET)
	public String test() {
		Gson gson = new Gson();
		List<UserInfo> datas = Service.getAllUsersInfos();
		return gson.toJson(datas);
	}
}

package com.example.demo.dao;

import java.util.List;

import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import com.example.demo.bean.UserInfo;

@Repository
@Mapper
public interface MyDao {
	List<UserInfo> getAllUsers();
}

package com.example.demo.service;

import java.util.List;

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

import com.example.demo.bean.UserInfo;
import com.example.demo.dao.MyDao;

@Service
public class MyService {
	
	@Autowired
	private MyDao dao;
	
	public List<UserInfo> getAllUsersInfos() {
		List<UserInfo> usersInfos  = dao.getAllUsers();
		return usersInfos;
	}
}

package com.example.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Demo20190328Application {

	public static void main(String[] args) {
		SpringApplication.run(Demo20190328Application.class, args);
	}

}

到这里已经可以正常的跑了,点击Demo20190328Application右键run as java application
浏览器中输入http://localhost:8888/test/hello
结果:
[{“uuid”:1,“name”:“zhan”,“age”:12,“grade”:“2021-12”,“sex”:1}]

注意事项:
pom中添加的依赖需要知道怎么去用,勿乱添加,有些依赖需要配置后才能用,否则会报错