前言
最近项目进入联调阶段,服务层的接口需要和协议层进行交互,协议层需要将入参[json字符串
]组装成服务层所需的json字符串,组装的过程中很容易出错。入参出错导致接口调试失败问题在联调中出现很多次,因此就想写一个请求日志切面把入参信息打印一下,同时协议层调用服务层接口名称对不上也出现了几次,通过请求日志切面就可以知道上层是否有没有发起调用,方便前后端甩锅还能拿出证据。
PS:本篇文章是实战性的,对于切面的原理不会讲解,只会简单介绍一下切面的知识点
切面介绍
面向切面编程是一种编程范式,它作为OOP面向对象编程的一种补充,用于处理系统中分布于各个模块的横切关注点,比如事务管理 、权限控制 、缓存控制 、日志打印 等等。AOP把软件的功能模块分为两个部分:核心关注点和横切关注点。业务处理的主要功能为核心关注点,而非核心、需要拓展的功能为横切关注点。AOP的作用在于分离系统中的各种关注点,将核心关注点和横切关注点进行分离,使用切面有以下好处:
- 集中处理某一关注点/横切逻辑
- 可以很方便的添加/删除关注点
- 侵入性少,增强代码可读性及可维护性 因此当想打印请求日志时很容易想到切面,对控制层代码0侵入
切面的使用【基于注解】
@Aspect
=> 声明该类为一个注解类
切点注解:
@Pointcut
=> 定义一个切点,可以简化代码
通知注解:
@Before
=> 在切点之前执行代码@After
=> 在切点之后执行代码@AfterReturning
=> 切点返回内容后执行代码,可以对切点的返回值进行封装@AfterThrowing
=> 切点抛出异常后执行@Around
=> 环绕,在切点前后执行代码
动手写一个请求日志切面
- 使用
@Pointcut
定义切点
@Pointcut("execution(* your_package.controller..*(..))")
public void requestServer() {
}
@Pointcut
定义了一个切点,因为是请求日志切边,因此切点定义的是Controller
包下的所有类下的方法。定义切点以后在通知注解中直接使用requestServer
方法名就可以了
- 使用@Before再切点前执行
@Before("requestServer()")
public void doBefore(JoinPoint joinPoint) {
ServletRequestAttributes attributes = (ServletRequestAttributes)
RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
LOGGER.info("===============================Start========================");
LOGGER.info("IP : {}", request.getRemoteAddr());
LOGGER.info("URL : {}", request.getRequestURL().toString());
LOGGER.info("HTTP Method : {}", request.getMethod());
LOGGER.info("Class Method : {}.{}", joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName());
}
在进入Controller
方法前,打印出调用方IP、请求URL、HTTP请求类型、调用的方法名
- 使用
@Around
打印进入控制层的入参
@Around("requestServer()")
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
long start = System.currentTimeMillis();
Object result = proceedingJoinPoint.proceed();
LOGGER.info("Request Params : {}", getRequestParams(proceedingJoinPoint));
LOGGER.info("Result : {}", result);
LOGGER.info("Time Cost : {} ms", System.currentTimeMillis() - start);
return result;
}
打印了入参、结果以及耗时
getRquestParams方法
private Map<String, Object> getRequestParams(ProceedingJoinPoint proceedingJoinPoint) {
Map<String, Object> requestParams = new HashMap<>();
//参数名
String[] paramNames = ((MethodSignature)proceedingJoinPoint.getSignature()).getParameterNames();
//参数值
Object[] paramValues = proceedingJoinPoint.getArgs();
for (int i = 0; i < paramNames.length; i++) {
Object value = paramValues[i];
//如果是文件对象
if (value instanceof MultipartFile) {
MultipartFile file = (MultipartFile) value;
value = file.getOriginalFilename(); //获取文件名
}
requestParams.put(paramNames[i], value);
}
return requestParams;
}
通过 @PathVariable
以及@RequestParam
注解传递的参数无法打印出参数名,因此需要手动拼接一下参数名,同时对文件对象进行了特殊处理,只需获取文件名即可
- @After方法调用后执行
@After("requestServer()")
public void doAfter(JoinPoint joinPoint) {
LOGGER.info("===============================End========================");
}
没有业务逻辑只是打印了End
完整切面代码
@Component
@Aspect
public class RequestLogAspect {
private final static Logger LOGGER = LoggerFactory.getLogger(RequestLogAspect.class);
@Pointcut("execution(* your_package.controller..*(..))")
public void requestServer() {
}
@Before("requestServer()")
public void doBefore(JoinPoint joinPoint) {
ServletRequestAttributes attributes = (ServletRequestAttributes)
RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
LOGGER.info("===============================Start========================");
LOGGER.info("IP : {}", request.getRemoteAddr());
LOGGER.info("URL : {}", request.getRequestURL().toString());
LOGGER.info("HTTP Method : {}", request.getMethod());
LOGGER.info("Class Method : {}.{}", joinPoint.getSignature().getDeclaringTypeName(),
joinPoint.getSignature().getName());
}
@Around("requestServer()")
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
long start = System.currentTimeMillis();
Object result = proceedingJoinPoint.proceed();
LOGGER.info("Request Params : {}", getRequestParams(proceedingJoinPoint));
LOGGER.info("Result : {}", result);
LOGGER.info("Time Cost : {} ms", System.currentTimeMillis() - start);
return result;
}
@After("requestServer()")
public void doAfter(JoinPoint joinPoint) {
LOGGER.info("===============================End========================");
}
/**
* 获取入参
* @param proceedingJoinPoint
*
* @return
* */
private Map<String, Object> getRequestParams(ProceedingJoinPoint proceedingJoinPoint) {
Map<String, Object> requestParams = new HashMap<>();
//参数名
String[] paramNames =
((MethodSignature)proceedingJoinPoint.getSignature()).getParameterNames();
//参数值
Object[] paramValues = proceedingJoinPoint.getArgs();
for (int i = 0; i < paramNames.length; i++) {
Object value = paramValues[i];
//如果是文件对象
if (value instanceof MultipartFile) {
MultipartFile file = (MultipartFile) value;
value = file.getOriginalFilename(); //获取文件名
}
requestParams.put(paramNames[i], value);
}
return requestParams;
}
}
高并发下请求日志切面
还有继续优化的地方 每个信息都打印一行,在高并发请求下确实会出现请求之间打印日志串行的问题,因为测试阶段请求数量较少没有出现串行的情况,果然生产环境才是第一发展力,能够遇到更多bug
,写更健壮的代码 解决日志串行的问题只要将多行打印信息合并为一行就可以了,因此构造一个对象
RequestInfo.java
@Data
public class RequestInfo {
private String ip;
private String url;
private String httpMethod;
private String classMethod;
private Object requestParams;
private Object result;
private Long timeCost;
}
环绕通知方法体
@Around("requestServer()")
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
long start = System.currentTimeMillis();
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
Object result = proceedingJoinPoint.proceed();
RequestInfo requestInfo = new RequestInfo();
requestInfo.setIp(request.getRemoteAddr());
requestInfo.setUrl(request.getRequestURL().toString());
requestInfo.setHttpMethod(request.getMethod());
requestInfo.setClassMethod(String.format("%s.%s", proceedingJoinPoint.getSignature().getDeclaringTypeName(),
proceedingJoinPoint.getSignature().getName()));
requestInfo.setRequestParams(getRequestParamsByProceedingJoinPoint(proceedingJoinPoint));
requestInfo.setResult(result);
requestInfo.setTimeCost(System.currentTimeMillis() - start);
LOGGER.info("Request Info : {}", JSON.toJSONString(requestInfo));
return result;
}
将url、http request
这些信息组装成RequestInfo
对象,再序列化打印对象 打印序列化 对象结果而不是直接打印对象是因为序列化有更直观、更清晰,同时可以借助在线解析工具对结果进行解析
是不是还不错
在解决高并发下请求串行问题的同时添加了对异常请求信息的打印 ,通过使用 @AfterThrowing
注解对抛出异常的方法进行处理
RequestErrorInfo.java
@Data
public class RequestErrorInfo {
private String ip;
private String url;
private String httpMethod;
private String classMethod;
private Object requestParams;
private RuntimeException exception;
}
异常通知环绕体
@AfterThrowing(pointcut = "requestServer()", throwing = "e")
public void doAfterThrow(JoinPoint joinPoint, RuntimeException e) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
RequestErrorInfo requestErrorInfo = new RequestErrorInfo();
requestErrorInfo.setIp(request.getRemoteAddr());
requestErrorInfo.setUrl(request.getRequestURL().toString());
requestErrorInfo.setHttpMethod(request.getMethod());
requestErrorInfo.setClassMethod(String.format("%s.%s", joinPoint.getSignature().getDeclaringTypeName(),
joinPoint.getSignature().getName()));
requestErrorInfo.setRequestParams(getRequestParamsByJoinPoint(joinPoint));
requestErrorInfo.setException(e);
LOGGER.info("Error Request Info : {}", JSON.toJSONString(requestErrorInfo));
}
对于异常,耗时是没有意义的,因此不统计耗时,而是添加了异常的打印
最后放一下完整日志请求切面代码:
@Component
@Aspect
public class RequestLogAspect {
private final static Logger LOGGER = LoggerFactory.getLogger(RequestLogAspect.class);
@Pointcut("execution(* your_package.controller..*(..))")
public void requestServer() {
}
@Around("requestServer()")
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
long start = System.currentTimeMillis();
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
Object result = proceedingJoinPoint.proceed();
RequestInfo requestInfo = new RequestInfo();
requestInfo.setIp(request.getRemoteAddr());
requestInfo.setUrl(request.getRequestURL().toString());
requestInfo.setHttpMethod(request.getMethod());
requestInfo.setClassMethod(String.format("%s.%s", proceedingJoinPoint.getSignature().getDeclaringTypeName(),
proceedingJoinPoint.getSignature().getName()));
requestInfo.setRequestParams(getRequestParamsByProceedingJoinPoint(proceedingJoinPoint));
requestInfo.setResult(result);
requestInfo.setTimeCost(System.currentTimeMillis() - start);
LOGGER.info("Request Info : {}", JSON.toJSONString(requestInfo));
return result;
}
@AfterThrowing(pointcut = "requestServer()", throwing = "e")
public void doAfterThrow(JoinPoint joinPoint, RuntimeException e) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
RequestErrorInfo requestErrorInfo = new RequestErrorInfo();
requestErrorInfo.setIp(request.getRemoteAddr());
requestErrorInfo.setUrl(request.getRequestURL().toString());
requestErrorInfo.setHttpMethod(request.getMethod());
requestErrorInfo.setClassMethod(String.format("%s.%s", joinPoint.getSignature().getDeclaringTypeName(),
joinPoint.getSignature().getName()));
requestErrorInfo.setRequestParams(getRequestParamsByJoinPoint(joinPoint));
requestErrorInfo.setException(e);
LOGGER.info("Error Request Info : {}", JSON.toJSONString(requestErrorInfo));
}
/**
* 获取入参
* @param proceedingJoinPoint
*
* @return
* */
private Map<String, Object> getRequestParamsByProceedingJoinPoint(ProceedingJoinPoint proceedingJoinPoint) {
//参数名
String[] paramNames = ((MethodSignature)proceedingJoinPoint.getSignature()).getParameterNames();
//参数值
Object[] paramValues = proceedingJoinPoint.getArgs();
return buildRequestParam(paramNames, paramValues);
}
private Map<String, Object> getRequestParamsByJoinPoint(JoinPoint joinPoint) {
//参数名
String[] paramNames = ((MethodSignature)joinPoint.getSignature()).getParameterNames();
//参数值
Object[] paramValues = joinPoint.getArgs();
return buildRequestParam(paramNames, paramValues);
}
private Map<String, Object> buildRequestParam(String[] paramNames, Object[] paramValues) {
Map<String, Object> requestParams = new HashMap<>();
for (int i = 0; i < paramNames.length; i++) {
Object value = paramValues[i];
//如果是文件对象
if (value instanceof MultipartFile) {
MultipartFile file = (MultipartFile) value;
value = file.getOriginalFilename(); //获取文件名
}
requestParams.put(paramNames[i], value);
}
return requestParams;
}
@Data
public class RequestInfo {
private String ip;
private String url;
private String httpMethod;
private String classMethod;
private Object requestParams;
private Object result;
private Long timeCost;
}
@Data
public class RequestErrorInfo {
private String ip;
private String url;
private String httpMethod;
private String classMethod;
private Object requestParams;
private RuntimeException exception;
}
}