SpringBoot框架 — 初始SpringBoot

1.搭建SpringBoot

1. 使用idea快速搭建spring boot框架
   
   選擇需要的依賴

   

   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
   </dependency>
   
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.46</version>
   </dependency>
   
   <!-- p6spy -->
   <dependency>
       <groupId>p6spy</groupId>
       <artifactId>p6spy</artifactId>
       <version>3.8.0</version>
   </dependency>
   
   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>2.1.1</version>
   </dependency>
   
   <dependency>
       <groupId>org.projectlombok</groupId>
       <artifactId>lombok</artifactId>
       <optional>true</optional>
   </dependency>
   
   <!--  熱部署  -->
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-devtools</artifactId>
       <optional>true</optional>
       <scope>true</scope>
   </dependency>
   

2. 創建測試代碼

   主程序類

   /**
    *  @SpringBootApplication 來標注一個主程序類，說明這是一個Spring Boot應用
    */
   @SpringBootApplication
   public class HelloWorldMainApplication {
       public static void main(String[] args) {
           SpringApplication.run(HelloWorldMainApplication.class,args);
       }
   }
   

   mapper層

   @Repository
   @Mapper
   public interface UserMapper {
       List<User> findUser();
   }
   

   <?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="com.accp.mapper.UserMapper">
   
       <select id="findUser" resultType="User">
           SELECT id,userCode,userName,userPassword,birthday FROM smbms_user
       </select>
   
   </mapper>
   

   service層

   @Service
   public class UserServiceImpl implements UserService {
   
       @Autowired
       private UserMapper userMapper;
   
       @Override
       public List<User> findUser(){
           return userMapper.findUser();
       }
   }
   

   controller層

   @RestController
   @RequestMapping("user")
   public class UserController {
       @Autowired
       private UserServiceImpl userService;
     	//GetMapping:發送一個get請求路徑
       @GetMapping("findUser")
       public List<User> findUser() {
           return userService.findUser();
       }
   }
   

3. 配置application.yml

   #設置端口號
   server:
     port: 8088
   spring:
     #MYSQL連接信息
     datasource:
       driver-class-name: com.p6spy.engine.spy.P6SpyDriver
       url: jdbc:p6spy:mysql://localhost:3306/smbms?useUnicode=true&characterEncoding=utf-8&useSSL=false
       username: root
       password: root
       hikari:
         idle-timeout: 6000
         maximum-pool-size: 50
         minimum-idle: 10
     #時間格式化
     jackson:
       date-format: yyyy-MM-dd
   #mybatis配置:
   mybatis:
     type-aliases-package: com.accp.pojo
     mapper-locations: classpath:xml/mapper/*.xml
   

2.SpringBoot中常用的一些注解

1. @SpringBootApplication 包含三個注解：@Configuration、@EnableAutoConfiguration、@ComponentScan
2. @Mapper：用于標注數據訪問組件 即用在 Mapper接口層 它是mybatis的注解，Mapper不需要配置掃描地址
3. @Repository：用于標注數據訪問組件 即用在 Mapper/Dao 接口層 它是spring的注解，需要在Spring中配置掃描地址
4. @Service：用于標注業務層
5. @RestController：用于標注控制層組件，包含@Controller和@ResponseBody
6. @MapperScan：通過此注解指定Mapper接口路徑

3.SpringBoot權限控制

public class LoginHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //獲取用戶是否登錄，如果沒有登錄則帶著提示消息回到登錄頁面
        Object user = request.getSession().getAttribute("user");
        if (user==null){
            request.setAttribute("msg","沒有權限請先登錄");
            request.getRequestDispatcher("login.html").forward(request,response);
            return false;
        }else {
            return true;
        }
    }
}