SpringBoot进阶

慕课网链接

表单数据的验证

在pojo类属性的上面添加注解 
@Entity
public class Girl {

    @Id
    @GeneratedValue
    private Integer id;

    @NotBlank(message = "这个字段必传")
    private String cupSize;

    @Min(value = 18, message = "未成年少女禁止入门")
//    @NotNull
//    @Max()
//    @Length()
    private Integer age;
}

校验使用（使用@valid来验证）

    @PostMapping(value = "/girls")
    public Result girlAdd(@Valid Girl girl, BindingResult bindingResult) {

        //使用BindingResult对象输出校验对象的出错信息

        if (bindingResult.hasErrors()) {
            return ResultUtil.error(1, bindingResult.getFieldError().getDefaultMessage());
        }
 
        girl.setCupSize(girl.getCupSize());
        girl.setAge(girl.getAge());
 
        return ResultUtil.success(girlRepository.save(girl));
    }

AOP统一处理

在pom中添加依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

并添加AOP操作类

@Aspect
@Component
public class HttpAspect {

}

添加方法

   @Before("execution(public * com.controller.GirlController.*(..))")
    public void before() {
      System.out.println("指定方法之前执行")
    }

   @After("execution(public * com.controller.GirlController.*(..))")
    public void after() {
      System.out.println("指定方法之后执行")
    }

/**
*    @Before: 方法执行之前
*    @After: 方法执行之后
*    @AfterReturning: 方法返回之后
*    (..)表示任何参数都会被拦截
*    *代表所有
*/

如果多次为这些方法进行切面编程可使用@Pointcut注解

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

   @Before("log()")
    public void before() {
      System.out.println("指定方法之前执行")
    }

   @After("log()")
    public void after() {
      System.out.println("指定方法之后执行")
    }

实际项目开发中也不推荐使用控制台输出（使用日志输出）

@Aspect
@Component
public class HttpAspect {

   private final static Looger logger=LoggerFactory.getLogger;

    @After("log()")
    public void doAfter() {
        logger.info("指定方法之后执行")
    }

    //输出方法的放回结果
    @AfterReturning(returning = "object", pointcut = "log()")
    public void doAfterReturning(Object object) {
        logger.info("response={}", object.toString());
    }

}

日志添加有用信息（请求有关的数据）

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();

        //url
        logger.info("url={}", request.getRequestURL());

        //method
        logger.info("method={}", request.getMethod());

        //ip
        logger.info("ip={}", request.getRemoteAddr());

        //类方法
        logger.info("class_method={}", joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());

        //参数
        logger.info("args={}", joinPoint.getArgs());
    }

异常的捕获和处理

统一异常处理的步骤

1. 建立一个Result类  ：http请求返回的最外层对象，包括code msg data

2. 写一个工具类：优化代码（减少重复代码）

//===========自定义异常类（spring只能捕获运行时异常，所以继承RuntimeException类）=============
public class GirlException extends RuntimeException{
	private Integer code;
	public GirlException(ResultEnum resultEnum) {
		super(resultEnum.getMsg());
		this.code=resultEnum.getCode();
	}
	public Integer getCode() {
		return code;
	}
	public void setCode(Integer code) {
		this.code = code;
	}
}

//==========异常捕获===========
@ControllerAdvice
public class ExceptionHandle {
	private final static Logger logger=LoggerFactory.getLogger(ExceptionHandle.class);
	@ExceptionHandler(value=Exception.class)
	@ResponseBody
	public Result handle(Exception e) {
		if(e instanceof GirlException) {
			GirlException girlException=(GirlException)e;
			return ResultUitl.error(girlException.getCode(), girlException.getMessage());
		}else {
			logger.error("【系统异常】{}",e);
			return ResultUitl.error(-1, e.getMessage());
		}
	}
}

异常出现的情况

//=========GirlController=======
 @RequestMapping("/girlGetAge/{id}")
	 public void getAge(@PathVariable("id") Integer id) throws Exception {
		 girlService.getAge(id);
	 }
//==========GirlService==============
//异常抛给controller
	public void getAge(Integer id) throws Exception{
		Girl girl=girlRepository.findOne(id);
		Integer age=girl.getAge();
		if(age<10) {
			throw new GirlException(ResultEnum.PRIMARY_SCHOOL);
		}else if(age>10 && age<16) {
			throw new GirlException(ResultEnum.MIDDLE_SCHOOL);
		}
	}
//=========ResultEnum==========
public enum ResultEnum {
	UNKONW_ERROR(-1,"未知错误"),
	SUCCESS(0,"成功"),
	PRIMARY_SCHOOL(100,"你在上小学"),
	MIDDLE_SCHOOL(101,"你在上初中"),
	;
	private Integer code;
	private String msg;
	get\set方法......
}

单元测试

测试controller

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class GrilController {
	@Autowired
	private MockMvc mvc;
	@Test
	public void girlList() throws Exception {
		mvc.perform(
				MockMvcRequestBuilders.get("/girl/girls"))
		.andExpect(MockMvcResultMatchers.status().isOk())
		.andExpect(MockMvcResultMatchers.content().string("abc"));
	}
}

 

来源：oschina

链接：https://my.oschina.net/u/3908739/blog/2208831