拦截器和日志打印实现

淡淡的烟草味﹌ 2022-02-02 04:27 309阅读 0赞

# 使用spring拦截器完成简易的日志记录 #

##### 1.在spring环境下，定义一个拦截器（实现HandlerInterceptorAdapter） #####

@Component
    public class BaseInterceptor extends HandlerInterceptorAdapter {
    
        @Override
        public boolean preHandle(HttpServletRequest request, 
        						HttpServletResponse response, Object handler) throws Exception {
            System.out.println("=================之前调用===================");
            return true;
        }
    
        @Override
        public void postHandle(HttpServletRequest request,
        	 HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
            System.out.println("=================之后调用===================");
            super.postHandle(request, response, handler, modelAndView);
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request,
        					 HttpServletResponse response, Object handler, Exception ex) throws Exception {
            System.out.println("=================请求完成===================");
            super.afterCompletion(request, response, handler, ex);
        }
    
        @Override
        public void afterConcurrentHandlingStarted(HttpServletRequest request,
        					 HttpServletResponse response, Object handler) throws Exception {
            System.out.println("=================异步调用===================");
            super.afterConcurrentHandlingStarted(request, response, handler);
        }
    }

##### 2.添加到spring环境中（看情况选一） #####

*  **spring的xml环境**  
    在springmvc配置文件中添加

<mvc:interceptors>
            <mvc:interceptor>
                
                <mvc:mapping path="/**" />
                
                <bean class="com.wlg.spring.interceptor.BaseInterceptor"></bean>
            </mvc:interceptor>
        </mvc:interceptors>

*  **springboot环境**  
    定义一个类配置

@Configuration
    public class WebMvcConfig extends WebMvcConfigurerAdapter {
    
        @Autowired
        BaseInterceptor baseInterceptor;
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
        	//排除此路径，其他都拦截
            //registry.addInterceptor(baseInterceptor).excludePathPatterns("/login/all");
            //指定路径，只拦截此路径
            registry.addInterceptor(baseInterceptor).addPathPatterns("/login/index");
            //如果两个同时存在，排除生效，指定的路径会拦截两次
            //添加拦截器
            super.addInterceptors(registry);
        }
    }

##### 3.启动项目测试，进行访问 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70]

##### 4.实现日志（导包） #####

<dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.17</version>
            </dependency>

##### 5.创建配置文件 #####

log4j.properties

### 设置debug级别级以上的打印到控制台###
    ### log4j.rootLogger = debug,stdout,D,E###
    ### 设置info级别级以上的打印到控制台###
    log4j.rootLogger = info,stdout,D,E
    
    ### 输出信息到控制抬 ###
    log4j.appender.stdout = org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.Target = System.out
    log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
    
    ### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
    log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.D.File = E://logs/log.log
    log4j.appender.D.Append = true
    log4j.appender.D.Threshold = DEBUG 
    log4j.appender.D.layout = org.apache.log4j.PatternLayout
    log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
    
    ### 输出ERROR 级别以上的日志到=E://logs/error.log ###
    log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.E.File =E://logs/error.log 
    log4j.appender.E.Append = true
    log4j.appender.E.Threshold = ERROR 
    log4j.appender.E.layout = org.apache.log4j.PatternLayout
    log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

##### 6.在拦截方法中添加日志（和上面拦截方法一致加了日志逻辑） #####

@Component
    public class BaseInterceptor extends HandlerInterceptorAdapter {
        private static Logger LOGGER = Logger.getLogger(BaseInterceptor.class);
    
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            String path = request.getServletPath();
            LOGGER.info("访问服务地址:{"+path+"}");
            System.out.println("=================之前调用===================");
            return true;
        }
    }

##### 简易的拦截器完成日志记录 #####

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70]: /images/20220202/c0a781f98d07429b86a6e1dea8166137.png