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Springboot使用@Valid 和AOP做参数校验以及日志输出

项目背景

最近在项目上对接前端的的时候遇到了几个问题

1.经常要问前端要请求参数

2.要根据请求参数写大量if...else，代码散步在 Controller 中，影响代码质量

3.为了解决问题1，到处记日志，导致到处改代码

解决方案

为了解决这类问题，我使用了@Valid 做参数校验，并使用AOP记录前端请求日志

1.Bean实体类增加注解

对要校验的实体类增加注解，如果实体类中有List结构，就在List上加@Valid

@Valid注解

注解	备注
@Null	只能为null
@NotNull	必须不为null
@Max(value)	必须为一个不大于 value 的数字
@Min(value)	必须为一个不小于 value 的数字
@AssertFalse	必须为false
@AssertTrue	必须为true
@DecimalMax(value)	必须为一个小于等于 value 的数字
@DecimalMin(value)	必须为一个大于等于 value 的数字
@Digits(integer,fraction)	必须为一个小数，且整数部分的位数不能超过integer，小数部分的位数不能超过fraction
@Past	必须是日期 ,且小于当前日期
@Future	必须是日期 ,且为将来的日期
@Size(max,min)	字符长度必须在min到max之间
@Pattern(regex=,flag=)	必须符合指定的正则表达式
@NotEmpty	必须不为null且不为空（字符串长度不为0、集合大小不为0）
@NotBlank	必须不为空（不为null、去除首位空格后长度不为0），不同于@NotEmpty，@NotBlank只应用于字符串且在比较时会去除字符串的空格
@Email	必须为Email，也可以通过正则表达式和flag指定自定义的email格式

UserInfo

package com.zero.check.query;

import lombok.Data;
import org.hibernate.validator.constraints.EAN;
import org.springframework.stereotype.Component;

import javax.validation.Valid;
import javax.validation.constraints.*;
import java.util.List;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/21 15:05
 * @history: 1.2019/11/21 created by wei.wang
 */
@Component
@Data
public class UserInfo {
    @NotBlank(message = "主键不能为空")
    @Pattern(regexp = "^[1-9]//d*$",message = "主键范围不正确")
    private String id;

    @Valid
    @NotEmpty(message = "用户列表不能为空")
    private List<User> userList;

    @NotNull(message = "权限不能为空")
    @Min(value = 1, message = "权限范围为[1-99]")
    @Max(value = 99, message = "权限范围为[1-99]")
    private Long roleId;
}

User

package com.zero.check.query;

import lombok.Data;
import org.springframework.stereotype.Component;

import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import java.util.List;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/21 16:03
 * @history: 1.2019/11/21 created by wei.wang
 */
@Component
@Data
public class User {
    @NotBlank(message = "用户工号不能为空")
    private String userId;

    @NotBlank(message = "用户名称不能为空")
    private String userName;

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }
}

2.Controller层

在需要校验的pojo前边添加@Validated，在需要校验的pojo后边添加BindingResult br接收校验出错信息，需要注意的是, BindingResult result一定要跟在 @Validated 注解对象的后面（必须是实体类），而且当有多个@Validated注解时,每个注解对象后面都需要添加一个 BindingResult，而实际使用时由于在WebLogAspect切点读取了请求数据，会导致在Controller层请求参数中读不到数据，这里需要修改其他内容，详见Git

DataCheckController

package com.zero.check.controller;

import com.zero.check.query.User;
import com.zero.check.query.UserInfo;
import com.zero.check.utils.Response;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/21 14:57
 * @history: 1.2019/11/21 created by wei.wang
 */
@RestController
@RequestMapping(value = "/check")
public class DataCheckController {

    @PostMapping(value = "/userValidPost")
    public Response queryUserPost(@Valid @RequestBody UserInfo userInfo, BindingResult result) {
        return Response.ok().setData("Hello " + userInfo.getId());
    }

    @GetMapping(value = "/userValidGet")
    public Response queryUserGet(@Valid User user, BindingResult result) {
        return Response.ok().setData("Hello " + user.getUserName());
    }
}

3.AOP

定义切点@Pointcut("execution( com.zero.check.controller.. (..))")，定义后可监控com.zero.check.controller包和子包里任意方法的执行

如果输入参数不能通过校验，就直接抛出异常，由于定义了UserInfoHandler拦截器，可以拦截处理校验错误，这样就可以省略大量的非空判断，让Controller层专注业务代码，并且将日志集中在WebLogAspect中处理，不会因为记录日志导致要到处改代码

if (bindingResult.hasErrors()) {
            FieldError error = bindingResult.getFieldError();
            throw new UserInfoException(Response.error(error.getDefaultMessage()).setData(error));
        }

UserInfoHandler

package com.zero.check.handler;

import com.zero.check.exception.UserInfoException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/21 15:04
 * @history: 1.2019/11/21 created by wei.wang
 */
@RestControllerAdvice
public class UserInfoHandler {

    /**
     * 校验错误拦截处理
     *
     * @param e 错误信息集合
     * @return 错误信息
     */
    @ExceptionHandler(UserInfoException.class)
    public Object handle(UserInfoException e) {
        return e.getR();
    }
}

WebLogAspect

package com.zero.check.aspect;

import com.alibaba.fastjson.JSON;
import com.zero.check.exception.UserInfoException;
import com.zero.check.utils.Response;
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.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/21 13:47
 * @history: 1.2019/11/21 created by wei.wang
 */

@Aspect
@Component
public class WebLogAspect {
    private Logger logger = LoggerFactory.getLogger(WebLogAspect.class);

    private final String REQUEST_GET = "GET";

    private final String REQUEST_POST = "POST";


    /**
     * 定义切点，切点为com.zero.check.controller包和子包里任意方法的执行
     */
    @Pointcut("execution(* com.zero.check.controller..*(..))")
    public void webLog() {

    }

    /**
     * 前置通知，在切点之前执行的通知
     *
     * @param joinPoint 切点
     */
    @Before("webLog() &&args(..,bindingResult)")
    public void doBefore(JoinPoint joinPoint, BindingResult bindingResult) {
        if (bindingResult.hasErrors()) {
            FieldError error = bindingResult.getFieldError();
            throw new UserInfoException(Response.error(error.getDefaultMessage()).setData(error));
        }
        //获取请求参数
        try {
            String reqBody = this.getReqBody();
            logger.info("REQUEST: " + reqBody);
        } catch (Exception ex) {
            logger.info("get Request Error: " + ex.getMessage());
        }

    }

    /**
     * 后置通知，切点后执行
     *
     * @param ret
     */
    @AfterReturning(returning = "ret", pointcut = "webLog()")
    public void doAfterReturning(Object ret) {
        //处理完请求，返回内容
        try {
            logger.info("RESPONSE: " + JSON.toJSONString(ret));
        } catch (Exception ex) {
            logger.info("get Response Error: " + ex.getMessage());
        }

    }

    /**
     * 返回调用参数
     *
     * @return ReqBody
     */
    private String getReqBody() {
        //从获取RequestAttributes中获取HttpServletRequest的信息
        HttpServletRequest request = this.getHttpServletRequest();
        //获取请求方法GET/POST
        String method = request.getMethod();
        Optional.ofNullable(method).orElse("UNKNOWN");
        if (REQUEST_POST.equals(method)) {
            return this.getPostReqBody(request);
        } else if (REQUEST_GET.equals(method)) {
            return this.getGetReqBody(request);
        }
        return "get Request Parameter Error";
    }

    /**
     * 获取request
     * Spring对一些（如RequestContextHolder、TransactionSynchronizationManager、LocaleContextHolder等）中非线程安全状态的bean采用ThreadLocal进行处理
     * 让它们也成为线程安全的状态
     *
     * @return
     */
    private HttpServletRequest getHttpServletRequest() {
        //获取RequestAttributes
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        return (HttpServletRequest) requestAttributes.resolveReference(RequestAttributes.REFERENCE_REQUEST);
    }

    /**
     * 获取GET请求数据
     *
     * @param request
     * @return
     */
    private String getGetReqBody(HttpServletRequest request) {
        Enumeration<String> enumeration = request.getParameterNames();
        Map<String, String> parameterMap = new HashMap<>(16);
        while (enumeration.hasMoreElements()) {
            String parameter = enumeration.nextElement();
            parameterMap.put(parameter, request.getParameter(parameter));
        }
        return parameterMap.toString();
    }

    /**
     * 获取POST请求数据
     *
     * @param request
     * @return 返回POST参数
     */
    private String getPostReqBody(HttpServletRequest request) {
        StringBuilder stringBuilder = new StringBuilder();
        try (InputStream inputStream = request.getInputStream();
             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))) {
            char[] charBuffer = new char[128];
            int bytesRead = -1;
            while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                stringBuilder.append(charBuffer, 0, bytesRead);
            }
        } catch (IOException e) {
            logger.info("get Post Request Parameter err : " + e.getMessage());
        }
        return stringBuilder.toString();
    }
}

4.测试

POST接口

localhost:9004/check/userValidPost

请求参数

{
    "id":"12",
    "userList": [
        {
            "userId": "Google",
            "userName": "http://www.google.com"
        },
        {
            "userId": "S",
            "userName": "http://www.SoSo.com"
        },
        {
            "userId": "SoSo",
            "userName": "http://www.SoSo.com"
        }
    ],
    "roleId":"11"
}

返回结果

{
    "code": "ok",
    "data": "Hello 12",
    "requestid": "706cd81db49d4c9795e5457cebb1ba8c"
}

请求参数

{
    "id":"1A2",
    "userList": [
        {
            "userId": "Google",
            "userName": "http://www.google.com"
        },
        {
            "userId": "S",
            "userName": "http://www.SoSo.com"
        },
        {
            "userId": "SoSo",
            "userName": "http://www.SoSo.com"
        }
    ],
    "roleId":"11"
}

返回结果

{
    "code": "error",
    "message": "主键范围不正确",
    "data": {
        "codes": [
            "Pattern.userInfo.id",
            "Pattern.id",
            "Pattern.java.lang.String",
            "Pattern"
        ],
        "arguments": [
            {
                "codes": [
                    "userInfo.id",
                    "id"
                ],
                "arguments": null,
                "defaultMessage": "id",
                "code": "id"
            },
            [],
            {
                "defaultMessage": "^[1-9]//d*$",
                "arguments": null,
                "codes": [
                    "^[1-9]//d*$"
                ]
            }
        ],
        "defaultMessage": "主键范围不正确",
        "objectName": "userInfo",
        "field": "id",
        "rejectedValue": "1A2",
        "bindingFailure": false,
        "code": "Pattern"
    },
    "requestid": "076c899495b448b59f1b133efd130061"
}

控制台输出

可以看到第一次请求时WebLogAspect成功打印了请求数据和返回结果,而第二次因为没有通过校验，没有进入WebLogAspect，所以没有打印数据

2019-11-21 22:50:43.283  INFO 94432 --- [nio-9004-exec-2] com.zero.check.aspect.WebLogAspect       : REQUEST: {
    "id":"1",
    "userList": [
        {
            "userId": "Google",
            "userName": "http://www.google.com"
        },
        {
            "userId": "S",
            "userName": "http://www.SoSo.com"
        },
        {
            "userId": "SoSo",
            "userName": "http://www.SoSo.com"
        }
    ],
    "roleId":"11"
}
2019-11-21 22:50:43.345  INFO 94432 --- [nio-9004-exec-2] com.zero.check.aspect.WebLogAspect       : RESPONSE: {"code":"ok","data":"Hello 1","requestid":"286174a075c144eeb0de0b8dbd7c1851"}

GET接口

localhost:9004/check/userValidGet?userId=a&userName=zero

返回结果

{
    "code": "ok",
    "data": "Hello zero",
    "requestid": "9b5ea9bf1db64014b0b4d445d8baf9dc"
}

localhost:9004/check/userValidGet?userId=a&userName=

返回结果

{
    "code": "error",
    "message": "用户名称不能为空",
    "data": {
        "codes": [
            "NotBlank.user.userName",
            "NotBlank.userName",
            "NotBlank.java.lang.String",
            "NotBlank"
        ],
        "arguments": [
            {
                "codes": [
                    "user.userName",
                    "userName"
                ],
                "arguments": null,
                "defaultMessage": "userName",
                "code": "userName"
            }
        ],
        "defaultMessage": "用户名称不能为空",
        "objectName": "user",
        "field": "userName",
        "rejectedValue": "",
        "bindingFailure": false,
        "code": "NotBlank"
    },
    "requestid": "5677d93c084d418e88cf5bb8547c5a2e"
}

控制台输出

可以看到第一次请求时WebLogAspect成功打印了请求和返回结果,而第二次因为没有通过校验，没有进入WebLogAspect，所以没有打印数据

2019-11-21 23:18:50.755  INFO 94432 --- [nio-9004-exec-9] com.zero.check.aspect.WebLogAspect       : REQUEST: {userName=zero, userId=a}
2019-11-21 23:18:50.756  INFO 94432 --- [nio-9004-exec-9] com.zero.check.aspect.WebLogAspect       : RESPONSE: {"code":"ok","data":"Hello zero","requestid":"422edc9cd59d45bea275e579a67ccd0c"}