Javaで入力パラメータと出力パラメータのログを統合して出力する方法

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リリース: 2023-05-10 15:37:06
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    1.背景   

    SpringBoot项目中,之前都是在controller方法的第一行手动打印 log,return之前再打印返回值。有多个返回点时,就需要出现多少重复代码,过多的非业务代码显得十分凌乱。

    本文将采用AOP 配置自定义注解实现 入参、出参的日志打印(方法的入参和返回值都采用 fastjson 序列化)。

    2.设计思路

    将特定包下所有的controller生成代理类对象,并交由Spring容器管理,并重写invoke方法进行增强(入参、出参的打印).

    3.核心代码

    3.1 自定义注解

    @Target(ElementType.TYPE)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Import({InteractRecordBeanPostProcessor.class})
    public @interface EnableInteractRecord {
    
        /**
         * app对应controller包名
         */
        String[] basePackages() default {};
    
        /**
         * 排除某些包
         */
        String[] exclusions() default {};
    
    }
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    3.2 实现BeanFactoryPostProcessor接口

    作用:获取EnableInteractRecord注解对象,用于获取需要创建代理对象的包名,以及需要排除的包名

    @Component
    public class InteractRecordFactoryPostProcessor implements BeanFactoryPostProcessor {
    
        private static Logger logger = LoggerFactory.getLogger(InteractRecordFactoryPostProcessor.class);
    
        private EnableInteractRecord enableInteractRecord;
    
        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
            try {
                String[] names = beanFactory.getBeanNamesForAnnotation(EnableInteractRecord.class);
                for (String name : names) {
                    enableInteractRecord = beanFactory.findAnnotationOnBean(name, EnableInteractRecord.class);
                    logger.info("开启交互记录 ", enableInteractRecord);
                }
            } catch (Exception e) {
                logger.error("postProcessBeanFactory() Exception ", e);
            }
        }
    
        public EnableInteractRecord getEnableInteractRecord() {
            return enableInteractRecord;
        }
    
    }
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    3.3 实现MethodInterceptor编写打印日志逻辑

    作用:进行入参、出参打印,包含是否打印逻辑

    @Component
    public class ControllerMethodInterceptor implements MethodInterceptor {
        private static Logger logger = LoggerFactory.getLogger(ControllerMethodInterceptor.class);
        // 请求开始时间
        ThreadLocal<Long> startTime = new ThreadLocal<>();
        private String localIp = "";
    
        @PostConstruct
        public void init() {
            try {
                localIp = InetAddress.getLocalHost().getHostAddress();
            } catch (UnknownHostException e) {
                logger.error("本地IP初始化失败 : ", e);
            }
        }
    
        @Override
        public Object invoke(MethodInvocation invocation) {
            pre(invocation);
            Object result;
            try {
                result = invocation.proceed();
                post(invocation, result);
                return result;
            } catch (Throwable ex) {
                logger.error("controller 执行异常: ", ex);
                error(invocation, ex);
            }
    
            return null;
    
        }
    
        public void error(MethodInvocation invocation, Throwable ex) {
            String msgText = ex.getMessage();
            logger.info(startTime.get() + " 异常,请求结束");
            logger.info("RESPONSE : " + msgText);
            logger.info("SPEND TIME : " + (System.currentTimeMillis() - startTime.get()));
        }
    
        private void pre(MethodInvocation invocation) {
            long now = System.currentTimeMillis();
            startTime.set(now);
            logger.info(now + " 请求开始");
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = attributes.getRequest();
    
            logger.info("URL : " + request.getRequestURL().toString());
            logger.info("HTTP_METHOD : " + request.getMethod());
            logger.info("REMOTE_IP : " + getRemoteIp(request));
            logger.info("LOCAL_IP : " + localIp);
            logger.info("METHOD : " + request.getMethod());
            logger.info("CLASS_METHOD : " + getTargetClassName(invocation) + "." + invocation.getMethod().getName());
    
            // 获取请求头header参数
            Map<String, String> map = new HashMap<String, String>();
            Enumeration<String> headerNames = request.getHeaderNames();
            while (headerNames.hasMoreElements()) {
                String key = (String) headerNames.nextElement();
                String value = request.getHeader(key);
                map.put(key, value);
            }
            logger.info("HEADERS : " + JSONObject.toJSONString(map));
            Date createTime = new Date(now);
            // 请求报文
            Object[] args = invocation.getArguments();// 参数
            String msgText = "";
            Annotation[][] annotationss = invocation.getMethod().getParameterAnnotations();
    
            for (int i = 0; i < args.length; i++) {
                Object arg = args[i];
                if (!(arg instanceof ServletRequest)
                        && !(arg instanceof ServletResponse)
                        && !(arg instanceof Model)) {
                    RequestParam rp = null;
                    Annotation[] annotations = annotationss[i];
                    for (Annotation annotation : annotations) {
                        if (annotation instanceof RequestParam) {
                            rp = (RequestParam) annotation;
                        }
                    }
                    if (msgText.equals("")) {
                        msgText += (rp != null ? rp.value() + " = " : " ") + JSONObject.toJSONString(arg);
                    } else {
                        msgText += "," + (rp != null ? rp.value() + " = " : " ") + JSONObject.toJSONString(arg);
                    }
                }
            }
            logger.info("PARAMS : " + msgText);
        }
    
        private void post(MethodInvocation invocation, Object result) {
            logger.info(startTime.get() + " 请求结束");
            if (!(result instanceof ModelAndView)) {
                String msgText = JSONObject.toJSONString(result);
                logger.info("RESPONSE : " + msgText);
            }
            logger.info("SPEND TIME : " + (System.currentTimeMillis() - startTime.get()));
    
        }
    
    
        private String getRemoteIp(HttpServletRequest request) {
            String remoteIp = null;
            String remoteAddr = request.getRemoteAddr();
            String forwarded = request.getHeader("X-Forwarded-For");
            String realIp = request.getHeader("X-Real-IP");
            if (realIp == null) {
                if (forwarded == null) {
                    remoteIp = remoteAddr;
                } else {
                    remoteIp = remoteAddr + "/" + forwarded.split(",")[0];
                }
            } else {
                if (realIp.equals(forwarded)) {
                    remoteIp = realIp;
                } else {
                    if (forwarded != null) {
                        forwarded = forwarded.split(",")[0];
                    }
                    remoteIp = realIp + "/" + forwarded;
                }
            }
            return remoteIp;
        }
    
        private String getTargetClassName(MethodInvocation invocation) {
            String targetClassName = "";
            try {
                targetClassName = AopTargetUtils.getTarget(invocation.getThis()).getClass().getName();
            } catch (Exception e) {
                targetClassName = invocation.getThis().getClass().getName();
            }
            return targetClassName;
        }
    
    }
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    AopTargetUtils:

    public class AopTargetUtils {  
      
          
        /** 
         * 获取 目标对象 
         * @param proxy 代理对象 
         * @return  
         * @throws Exception 
         */  
        public static Object getTarget(Object proxy) throws Exception {  
              
            if(!AopUtils.isAopProxy(proxy)) {
                return proxy;//不是代理对象  
            }  
              
            if(AopUtils.isJdkDynamicProxy(proxy)) {
                return getJdkDynamicProxyTargetObject(proxy);  
            } else { //cglib  
                return getCglibProxyTargetObject(proxy);  
            }  
              
              
              
        }  
      
      
        private static Object getCglibProxyTargetObject(Object proxy) throws Exception {  
            Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");  
            h.setAccessible(true);
            Object dynamicAdvisedInterceptor = h.get(proxy);  
              
            Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");  
            advised.setAccessible(true);  
              
            Object target = ((AdvisedSupport)advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();
              
            return getTarget(target);
        }  
      
      
        private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {  
            Field h = proxy.getClass().getSuperclass().getDeclaredField("h");  
            h.setAccessible(true);  
            AopProxy aopProxy = (AopProxy) h.get(proxy);
              
            Field advised = aopProxy.getClass().getDeclaredField("advised");  
            advised.setAccessible(true);  
              
            Object target = ((AdvisedSupport)advised.get(aopProxy)).getTargetSource().getTarget();
              
            return getTarget(target); 
        }  
          
    }
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    3.4 实现BeanPostProcessor接口

    作用:筛选出需要生成代理的类,并生成代理类,返回给Spring容器管理。

    public class InteractRecordBeanPostProcessor implements BeanPostProcessor {
    
        private static Logger logger = LoggerFactory.getLogger(InteractRecordBeanPostProcessor.class);
    
        @Autowired
        private InteractRecordFactoryPostProcessor interactRecordFactoryPostProcessor;
    
        @Autowired
        private ControllerMethodInterceptor controllerMethodInterceptor;
    
        private String BASE_PACKAGES[];//需要拦截的包
    
        private String EXCLUDING[];// 过滤的包
    
        //一层目录匹配
        private static final String ONE_REGEX = "[a-zA-Z0-9_]+";
    
        //多层目录匹配
        private static final String ALL_REGEX = ".*";
    
        private static final String END_ALL_REGEX = "*";
    
        @PostConstruct
        public void init() {
            EnableInteractRecord ir = interactRecordFactoryPostProcessor.getEnableInteractRecord();
            BASE_PACKAGES = ir.basePackages();
            EXCLUDING = ir.exclusions();
        }
    
        @Override
        public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
            try {
                if (interactRecordFactoryPostProcessor.getEnableInteractRecord() != null) {
                    // 根据注解配置的包名记录对应的controller层
                    if (BASE_PACKAGES != null && BASE_PACKAGES.length > 0) {
                        Object proxyObj = doEnhanceForController(bean);
                        if (proxyObj != null) {
                            return proxyObj;
                        }
                    }
                }
            } catch (Exception e) {
                logger.error("postProcessAfterInitialization() Exception ", e);
            }
            return bean;
        }
    
        @Override
        public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
            return bean;
        }
    
        private Object doEnhanceForController(Object bean) {
            String beanPackageName = getBeanPackageName(bean);
            if (StringUtils.isNotBlank(beanPackageName)) {
                for (String basePackage : BASE_PACKAGES) {
                    if (matchingPackage(basePackage, beanPackageName)) {
                        if (EXCLUDING != null && EXCLUDING.length > 0) {
                            for (String excluding : EXCLUDING) {
                                if (matchingPackage(excluding, beanPackageName)) {
                                    return bean;
                                }
                            }
                        }
                        Object target = null;
                        try {
                            target = AopTargetUtils.getTarget(bean);
                        } catch (Exception e) {
                            logger.error("AopTargetUtils.getTarget() exception", e);
                        }
                        if (target != null) {
                            boolean isController = target.getClass().isAnnotationPresent(Controller.class);
                            boolean isRestController = target.getClass().isAnnotationPresent(RestController.class);
                            if (isController || isRestController) {
                                ProxyFactory proxy = new ProxyFactory();
                                proxy.setTarget(bean);
                                proxy.addAdvice(controllerMethodInterceptor);
                                return proxy.getProxy();
                            }
                        }
                    }
                }
    
            }
            return null;
        }
    
        private static boolean matchingPackage(String basePackage, String currentPackage) {
            if (StringUtils.isEmpty(basePackage) || StringUtils.isEmpty(currentPackage)) {
                return false;
            }
            if (basePackage.indexOf("*") != -1) {
                String patterns[] = StringUtils.split(basePackage, ".");
                for (int i = 0; i < patterns.length; i++) {
                    String patternNode = patterns[i];
                    if (patternNode.equals("*")) {
                        patterns[i] = ONE_REGEX;
                    }
                    if (patternNode.equals("**")) {
                        if (i == patterns.length - 1) {
                            patterns[i] = END_ALL_REGEX;
                        } else {
                            patterns[i] = ALL_REGEX;
                        }
                    }
                }
                String basePackageRegex = StringUtils.join(patterns, "\\.");
                Pattern r = Pattern.compile(basePackageRegex);
                Matcher m = r.matcher(currentPackage);
                return m.find();
            } else {
                return basePackage.equals(currentPackage);
            }
        }
    
        private String getBeanPackageName(Object bean) {
            String beanPackageName = "";
            if (bean != null) {
                Class<?> beanClass = bean.getClass();
                if (beanClass != null) {
                    Package beanPackage = beanClass.getPackage();
                    if (beanPackage != null) {
                        beanPackageName = beanPackage.getName();
                    }
                }
            }
            return beanPackageName;
        }
    
    }
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    3.5 启动类配置注解

    @EnableInteractRecord(basePackages = “com.test.test.controller”,exclusions = “com.test.demo.controller”)
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    以上即可实现入参、出参日志统一打印,并且可以将特定的controller集中管理,并不进行日志的打印(及不进生成代理类)。

    4.出现的问题(及其解决办法)

    实际开发中,特定不需要打印日志的接口,无法统一到一个包下。大部分需要打印的接口,和不需要打印的接口,大概率会参杂在同一个controller中,根据以上设计思路,无法进行区分。

    解决办法:

    自定义排除入参打印注解

    @Target(ElementType.METHOD)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface ExcludeReqLog {
    }
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    自定义排除出参打印注解

    @Target(ElementType.METHOD)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface ExcludeRespLog {
    }
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    增加逻辑

    // 1.在解析requestParam之前进行判断
            Method method = invocation.getMethod();
            Annotation[] declaredAnnotations = method.getDeclaredAnnotations();
            boolean flag = true;
            for (Annotation annotation : declaredAnnotations) {
                if (annotation instanceof ExcludeReqLog) {
                    flag = false;
                }
            }
            if (!flag) {
                logger.info("该方法已排除,不打印入参");
                return;
            }
    // 2.在解析requestResp之前进行判断
            Method method = invocation.getMethod();
            Annotation[] declaredAnnotations = method.getDeclaredAnnotations();
            boolean flag = true;
            for (Annotation annotation : declaredAnnotations) {
                if (annotation instanceof ExcludeRespLog) {
                    flag = false;
                }
            }
            if (!flag) {
                logger.info("该方法已排除,不打印出参");
                return;
            }
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    使用方法

    // 1.不打印入参
        @PostMapping("/uploadImg")
        @ExcludeReqLog
        public Result<List<Demo>> uploadIdeaImg(@RequestParam(value = "imgFile", required = false) MultipartFile[] imgFile) {
            return demoService.uploadIdeaImg(imgFile);
        }
    //2.不打印出参
        @PostMapping("/uploadImg")
        @ExcludeRespLog 
        public Result<List<Demo>> uploadIdeaImg(@RequestParam(value = "imgFile", required = false) MultipartFile[] imgFile) {
            return demoService.uploadIdeaImg(imgFile);
        }
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    以上がJavaで入力パラメータと出力パラメータのログを統合して出力する方法の詳細内容です。詳細については、PHP 中国語 Web サイトの他の関連記事を参照してください。

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