1 环境
Maven 3.6.0+
https://blog.csdn.net/github_37759996/article/details/90748461开发工具：IDEA
必备插件
1、lombok
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
2、 mysql
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
3、jdbc
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
4、druid
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
5、mybatis
6、junit
7、log4j
8、SpringBoot2
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
9、devtools
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
2 构建一个SpringBoot2项目步骤
https://spring.io/quickstart
1、点击IDEA的创建项目；
2、点击spring initializer
3、编写常规说明；
4、选择插件；
5、完成。
3 springboot2 结构
image.png
1) Main.class 主启动类；
2) controller 控制层
3) Mapper 数据映射接口层
4) Dao 数据层
5) Service 服务层
6) Entities 实体层
7) application.yml 核心配置文件
8) Config 功能扩展层
9) Utils 工具层
13) resources/mybatis 数据映射xml层
3.1 Main.class示例
main文件
main文件包括java和resource两个文件夹，Java存放核心代码，resource存放配置文件和静态资源文件
image.png
xxx.application
- 作用：xxx.application是Springboot的主启动类；
- 示例如下：
package com.test.fri;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Springboot2learntestApplication {
public static void main(String[] args) {
SpringApplication.run(Springboot2learntestApplication.class, args);
}
}
3.2 controller示例
- 作用：存放控制层程序，接收前端发来的URL请求和参数，调用Service层的方法执行请求，返回结果；
- 示例：
package com.test.fri.controller;
import com.test.fri.Service.UrlCheckResult;
import com.test.fri.Service.UrlCheckService;
import com.test.fri.Service.UrlSaveService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
@RestController
public class UrlHandler {
@Autowired
UrlCheckService urlCheckService;
@Autowired
UrlSaveService urlSaveService;
@RequestMapping(value = "/website/check/{url}", method = RequestMethod.GET)
public UrlCheckResult urlCheckResult(@PathVariable("url") String url){
return urlCheckService.getResult(url);
}
@RequestMapping(value = "/website/save/{url}",method = RequestMethod.GET)
public void urlSaver(@PathVariable("url") String url){
urlSaveService.saveCheckResult(url);
}
}
3.3 Mapper示例
- 作用：实体对象和sql语句的映射
- 示例：
<?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="org.springblade.core.log.mapper.LogApiMapper">
<!-- 通用查询映射结果 -->
<resultMap id="logResultMap" type="org.springblade.core.log.model.LogApi">
<result column="id" property="id"/>
<result column="create_time" property="createTime"/>
<result column="service_id" property="serviceId"/>
<result column="server_host" property="serverHost"/>
<result column="server_ip" property="serverIp"/>
<result column="env" property="env"/>
<result column="type" property="type"/>
<result column="title" property="title"/>
<result column="method" property="method"/>
<result column="request_uri" property="requestUri"/>
<result column="user_agent" property="userAgent"/>
<result column="remote_ip" property="remoteIp"/>
<result column="method_class" property="methodClass"/>
<result column="method_name" property="methodName"/>
<result column="params" property="params"/>
<result column="time" property="time"/>
<result column="create_by" property="createBy"/>
</resultMap>
<!-- 通用查询结果列 -->
<sql id="baseColumnList">
select id,
create_time AS createTime,
service_id, server_host, server_ip, env, type, title, method, request_uri, user_agent, remote_ip, method_class, method_name, params, time, create_by
</sql>
</mapper>
3.4 Dao示例
- 作用：存储Mapper映射方法的接口程序
package org.springblade.core.log.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springblade.core.log.model.LogApi;
/**
* Mapper 接口
*
* @author Chill
* @since 2018-09-26
*/
public interface LogApiMapper extends BaseMapper<LogApi> {
}
3.5 Service示例
- 作用：处理数据的具体方法
- 示例：
package com.test.fri.Service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UrlCheckService {
@Autowired
// urlCheckResult是个json
UrlCheckResult urlCheckResult;
public UrlCheckResult getResult(String url){
// method body
return this.urlCheckResult;
}
}
3.6 Entities示例
- 作用： 定义实体，用于和数据产生映射
- 示例：
package com.test.fri.Entities.AritlcleService;
import lombok.Data;
import org.springframework.stereotype.Component;
@Component
@Data
public class test {
private int var1;
private String var2;
}
3.7 application.yml示例
- 作用：配置程序的基本环境，例如服务器端口、数据源等信息
- 示例：
#配置服务器端口
server:
port: 8080
#配置数据源
spring:
datasource:
url: jdbc:mysql://localhost:3306/cache?useSSL=FALSE&serverTimezone=UTC
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver
