第一个spring-boot项目

1.配置文件  application.yml
spring:
  profiles:
    active: dev
  datasource:
      driver-class-name: oracle.jdbc.driver.OracleDriver
      url: jdbc:oracle:thin:@localhost:1521:xe
      username: system
      password: 123456
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

1.读取配置文件的内容.

server:
  port: 8081
  context-path: /boot

service:
  name: freya
  version: 1.1

 (1).@Value("${service.name}") 

      private String name ;

  (2).使用Environment，env.getProperty("键名")

           @Autowired

    private Environment env;

    @RequestMapping(value = "/hello")
    public String hello() {
        return "hello spring boot! " + env.getProperty("service.name");
    }
(3)自定义一个实体类

@Component
@ConfigurationProperties(prefix = "project")  //配置文件中前缀
@PropertySource(value = "classpath:config/config.properties") //文件位置
public class MyConfig {
    private String version;
    private String name;

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}
在controller中获取

RestController
public class HelloController {

    @Autowired
    private MyConfig myConfig;

    @RequestMapping(value = "/hello")
    public String hello() {
        return "hello spring boot! " myConfig.getVersion() + " " +  myConfig.getName() ;
    }
}

2.表单提交

controller层
@PostMapping("/save")
public Girl save(@Valid Girl girl, BindingResult bindingResult){
    if(bindingResult.hasErrors()){
        System.out.print(bindingResult.getFieldError().getDefaultMessage());
        return null;
    }
    girl.setAge(girl.getAge());
    girl.setCupSize(girl.getCupSize());
    girl.setMoney(girl.getMoney());
    return girlRepository.save(girl);
}

  实体类

@Entity  //对应数据库中的表
public class Girl{

    @Id //主键
    @GeneratedValue 自增,从1开始
    private Integer id;

    @Min(value = 18,message = "未成年")   //最小值为18,不满足返回message的值
    private Integer age;
    private String cupSize;

    @Min(value = 0,message = "金额必传")
    private Double money;

 3.自定义异常  (codeEnum为枚举类型,方便管理异常状态码与返回信息)

public class GirlException extends RuntimeException{
    private String respCode;

    public GirlException(CodeEnum codeEnum) { 
        super(codeEnum.getMsg());
        this.respCode = codeEnum.getCode();
    }
    public GirlException(String message,String code) {
        super(message);
        this.respCode = code;
    }
    public String getRespCode() {
        return respCode;
    }

    public void setRespCode(String respCode) {
        this.respCode = respCode;
    }
}

//枚举实体public enum CodeEnum {

    ERROR_CODE("-1","系统异常"),
    OK_CODE("0","OK"),
    PRE_SCHOOL("100","你可能还在上小学吧"),
    HIGH_SCHOOL("101","你可能还在上中学吧");

    CodeEnum(String code, String msg) {
        this.code = code;
        this.msg = msg;
    }
    private String code;
    private String msg;

    public String getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
}
 /**

 * 捕捉异常类  (handle)
 */
@ControllerAdvice
public class ExceptionHandle {

    @ExceptionHandler
    @ResponseBody
    public ResultMap handle(Exception e){
        if(e instanceof GirlException){
            GirlException girlException = (GirlException) e;
            return ResultMap.error(girlException.getRespCode(),girlException.getMessage(),"");
        }
        return ResultMap.error(e.getMessage());
    }
}

/**
 *  spring-boot ao
 */
@Aspect

@Component
public class HttpAspect {

    private static final Logger log = LoggerFactory.getLogger(HttpAspect.class);  //spring中自带的日志包

    @Pointcut("execution(* com.girl.controller.GirlController.*(..))")
    public void log(){}

    @Before("log()")
    public void log1(){
        //获取request请求
        RequestAttributes ra = RequestContextHolder.getRequestAttributes();
        ServletRequestAttributes sra = (ServletRequestAttributes) ra;
        HttpServletRequest request = sra.getRequest();
        log.info("id={}",request.getRemoteAddr());  //日志信息将输出在{}中
 
    }
}

多模块部署:
https://www.imooc.com/video/16354