SpringBoot Web进阶学习笔记

一、课程介绍

1、使用@Valid表单验证

2、使用AOP处理请求

3、统一异常处理

4、单元测试

 

二、表单验证

用@Min(value = 18, message = "msg")注解字段

要验证的实体类前加上@Valid，在方法中参数加入BindingResult bindingResult

method(@Valid Girl girl, BindingResult bindingResult) {
   if (bindingResult.hasError()) {
     System.out.println(bindingResult.getFieldError().getDefaultMessage());
   }        
}

 

三、AOP

AOP是一种编程范式，与语言无关，是一种程序设计思想

　　面向切面（AOP）Aspect Oriented Programming

　　面向对象（OOP）Object Oriented Programming

　　面向过程（POP）Procedure Oriented Programming

@Aspect注解切面类

@Before、@After注解方法，定义拦截的包、方法

方法一：

@Before("execution(public * com.imooc.controller.GirlController.*(..))")
doBefore(){
  ...  
}

方法二：　　

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

@Before("log()")
public void doBefore() {
  ...
}

@After("log()")
public void doAfter() {
  ...
}

完整案例：

package edu.jmu.springboot.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * @author xiejw
 * @date 2018/10/31 20:37
 */
@Aspect
@Component
public class HttpAspect {

    private static final Logger logger = LoggerFactory.getLogger(HttpAspect.class);

    @Pointcut("execution(public * edu.jmu.springboot.controller.*.*(..))")
    public void log() {
    }

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
        logger.info("----- Aspect Before -----");
        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());
    }

    @After("log()")
    public void doAfter() {
        logger.info("----- Aspect After -----");
    }

    @AfterReturning(returning = "object", pointcut = "log()")
    public void doAfterReturning(Object object) {
        logger.info("----- Aspect AfterReturning -----");
        logger.info("response={}", object.toString());
    }
}

　　

　　

四、统一异常处理

 

继承RuntimeException时，spring才会进行事务回滚