1. 表单验证

首先, 在实体类的需要验证的字段上添加添加验证注解, 验证注解类主要在 validation-api-1.1.0.Final.jar 的 javax.validation.constraints 包下, 以及 hibernate-validator-5.3.6.Final.jar 的 org.hibernate.validator.constraints 包下, 常用验证注解:  @Min @Max @Length @Email 等.

public class User {private Integer id;private String name;@Min(value=12,message="年龄不能小于12岁")private Integer age;

然后, 在需要验证的参数前加 @Valid 注解, 使用 BindingResult 获取验证不通过的信息

@RestController
public class UserController {@PostMapping("/addUser")public void getUserList(@Valid User user, BindingResult bindingResult) {if(bindingResult.hasErrors()) {// 打印出字段验证信息System.out.println(bindingResult.getFieldError().getDefaultMessage());System.out.println("BBBBBBBBB");}System.out.println("AAAAAAAAAAA");}
}

2. AOP 统一处理请求

首先, 要引入 aop 相关 jar 包

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

然后, 新建 aop 类

package com.codingos.springboot.aspect;import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
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;@Aspect
@Component
public class HttpAspect {private final static Logger logger = LoggerFactory.getLogger(HttpAspect.class);@Pointcut("execution(public * com.codingos.springboot.controller.UserController.*(..))")public void log() {}/***  在被切入的方法执行之前执行*/@Before("log()")public void doBefore(JoinPoint joinPoint) {logger.info("***************** before aop 执行 ****************");ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();// urllogger.info("url={}", attributes.getRequest().getRequestURL());// methondlogger.info("method={}", attributes.getRequest().getMethod());// iplogger.info("ip={}", attributes.getRequest().getRemoteAddr());// 类方法logger.info("class_method={}", joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());// 参数logger.info("args={}", joinPoint.getArgs());}/***  在被切入的方法执行之后执行*/@After("log()")public void doAfter() {logger.info("************************ after aop 执行 **************************");}/*** 用来获取返回值*/@AfterReturning(returning = "object",pointcut = "log()")public void doAfterReturning(Object object) {logger.info("response={}", object.toString());}
}

3. 统一返回格式

统一返回实体类

package com.codingos.springboot.common;public class Result<T> {private Integer code;// 正常成功为0，异常失败为1private String message;private T data;public Result() {}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public T getData() {return data;}public void setData(T data) {this.data = data;}
}

返回工具类

public class ResultUtil<T> {public static <T> Result<T> success(T object) {Result<T> result = new Result<>();result.setCode(0);result.setMessage("成功");result.setData(object);return result;}public static <T> Result<T> success() {Result<T> result = new Result<>();result.setCode(0);result.setMessage("成功");return result;}public static <T> Result<T> error(Integer code, String message) {Result<T> result = new Result<>();result.setCode(code);result.setMessage(message);return result;}
}

返回状态码 (错误码)

public enum ResultEnum {EXCEPTION(-1,"未知异常"),SUCCESS(0,"操作正常"),ERROR(1,"发生错误");private Integer code;private String message;private ResultEnum(Integer code, String message) {this.code = code;this.message = message;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}
}

4. 统一异常处理

自定义异常

public class CustomException extends RuntimeException {private static final long serialVersionUID = 7425266758852563283L;private Integer code;public CustomException(ResultEnum resultEnum) {super(resultEnum.getMessage());this.code = resultEnum.getCode();}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}
}

统一异常处理类 (异常往上抛 , 到controller 层也往外抛)

@ControllerAdvice
public class ExceptionHandle {private final static Logger logger = LoggerFactory.getLogger(ExceptionHandle.class);@ExceptionHandler(value=Exception.class)@ResponseBodypublic Result<Object> handle(Exception e) {logger.error(ResultEnum.EXCEPTION.getMessage(), e);return ResultUtil.result(ResultEnum.EXCEPTION, e.getMessage());}
}

代码参考
可以到我的码云 https://gitee.com/jayking/spring-boot-learning 中的 spring-boot-web 目录下