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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 |
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"}
5. 代码 Git 地址
git@github.com:A-mantis/SpringBootDataCheck.git