创建springboot的四种方法
Rest：一种资源描述风格
读取配置文件
junit
整合Mybatis
拦截器
项目打包部署
profile 配置
- properties 配置环境
开发
- yml 配置环境

创建springboot的四种方法

Rest：一种资源描述风格
书写简化，隐藏真实的访问名称，使用复数描述模块

restful：按这种风格访问资源
常规风格：http://localhost/users/getById?id=1
Rest风格：http://localhost/users/1

四个动作：
查询单个、多个：get
新增：post
修改：put
删除：delete

注解

@RequestBody 接收json格式参数

@Controller
public class UserController {
//新增
    @RequestMapping(value = "/users",method = RequestMethod.POST)
    @ResponseBody
    public String save(@RequestBody User user) {
        System.out.println("user save..." + user);
        return "{'module':'user save'}";
    }
//修改
    @RequestMapping(value = "/users",method = RequestMethod.PUT)
    @ResponseBody
    public String update(@RequestBody User user){
        System.out.println("user update..."+user);
        return "{'module':'user update'}";
    }
}

@PathVariable 接收单个或较少参数

@Controller
public class BookController {
//删除    
    @RequestMapping(value = "/users/{id}",method = RequestMethod.DELETE)
    @ResponseBody
    public String delete(@PathVariable Integer id){
        System.out.println("user delete..."+id);
        return "{'module':'user delete'}";
    }
}

@RequestParam 接收非json格式参数，使用较少

精简注解

//@Controller+@ResponseBody=@RestController
@RestController
@RequestMapping(value = "/users")
public class UserController {
//    @RequestMapping(method = RequestMethod.POST)=@PostMapping
    @PostMapping
    public String save(@RequestBody User user) {
        System.out.println("user save..." + user);
        return "{'module':'user save'}";
    }
}

读取配置文件

@RestController
@RequestMapping("/run")
public class TestController {
    @Value("${driver1}")
    private String driver;
    @GetMapping
    public String run() {
        System.out.println(driver);
        return "running...";
    }
}

@RestController
@RequestMapping("/run")
public class RunController {
    @Resource
    private Environment env;
    @GetMapping
    public String run() {
        System.out.println(env.getProperty("server.port"));
        return "running...";
    }
}

//控制器
@RestController
@RequestMapping("/run")
public class RunController {
    @Resource
    private Run run;
    @GetMapping
    public String run() {
        System.out.println(run);
        return "running...";
    }
}
//对象类
@Component
@Data
//匹配yml的数据头
@ConfigurationProperties(prefix = "spring.datasource")
public class Run {
    private String driver;
    private String url;
    private String username;
    private String password;
}

junit

SpringBoot测试类所在包的级别中如果高于启动类所在包，就需要手动添加启动类的类文件
@SpringBootTest(classes = DemoApplication.class)
也可以写为
@SpringBootTest<br />@ContextConfiguration(classes = DemoApplication.class)

整合Mybatis

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>

MyBatis Plus提供注解方法

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>

//指定查询的表
@TableName("Users")
public interface UserMapper extends BaseMapper<User> { //mybatisPlus提供的方法，不需要自己写增删改查
}

Druid 监控sql语句

<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.8</version>

# 第一种
spring:
  datasource:
    druid:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/woniuxy?characterEncoding=utf8&useSSL=false&serverTimezone=UTC
      username: root
      password: 123
# 第二种
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/woniuxy?characterEncoding=utf8&useSSL=false&serverTimezone=UTC
    username: root
    password: 123
    type: com.alibaba.druid.pool.DruidDataSource

yml中MyBatis相关配置

# MyBatis相关配置
mybatis:
  # 加载的MyBatis配置文件路径，对应:resources/mappers
  mapper-locations: /mappers/*.xml
  # 别名配置，加上后配置文件中可以不用写类的全路径，直接写类名即可。简化配置
  type-aliases-package: com.wnxy.pojo
  configuration:
    # 数据库中列下划线自动转驼峰
    map-underscore-to-camel-case: true
    #标准方式输出运行日志
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

MyBatis Plus分页

配置拦截器

@Configuration
public class MPConfig {
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){
        MybatisPlusInterceptor interceptor=new MybatisPlusInterceptor() ;
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return interceptor;
    }
}

调用分页方法

@RestController
@RequestMapping("run")
public class RunController {
    @Resource
    private  UsersMapper usersMapper;
    @GetMapping
    public void main(){
        Page page=new Page(1,2) ;
        usersMapper.selectPage(page,null);
    }
}

拦截器

项目打包部署

profile 配置

properties 配置环境

三种环境： ```properties
开发
application-dev.properties 配置端口：server.port=8081 application-test.properties 配置端口：server.port=8082 application-pro.properties 配置端口：server.port=8083


   1. `application-dev.properties`
   1. `application-test.properties`
   1. `application-pro.properties`
2. 激活环境：在在application.xml中配置
```yaml
# properties和yml同时存在时，优先使用properties
# 开发环境
application-dev.properties
配置内容：server.port=8081
# 测试环境
application-test.properties
配置内容：server.port=8082
# 开发环境
application-pro.properties
配置内容：server.port=8083

# 激活application-test.properties
spring.profiles.active=test

SpringBoot