Spring MVC Interceptor 实现性能监控的功能代码

import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.core.NamedThreadLocal;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;  public class PerformanceInterceptor implements HandlerInterceptor {   private final static Logger LOGGER = LoggerFactory.getLogger(PerformanceInterceptor.class);   private NamedThreadLocal<Long> startTimeThreadLocal = new NamedThreadLocal<Long>("performance");   @Override  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)      throws Exception {    startTimeThreadLocal.set(System.currentTimeMillis());    return true;  }   @Override  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,      ModelAndView modelAndView) throws Exception {    return;  }   @Override  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)      throws Exception {    long currentTime = System.currentTimeMillis();    long executeTime = currentTime - startTimeThreadLocal.get();    LOGGER.info("uri：{} 执行了 {} 毫秒", request.getRequestURI(), executeTime);  } }

package org.springframework.core; import org.springframework.util.Assert; public class NamedThreadLocal<T> extends ThreadLocal<T> {   private final String name;   public NamedThreadLocal(String name) {    Assert.hasText(name, "Name must not be empty");    this.name = name;  }   @Override  public String toString() {    return this.name;  } }

import java.util.List; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;import org.springframework.boot.web.filter.OrderedCharacterEncodingFilter;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.web.filter.CharacterEncodingFilter;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import com.vnierlai.scm.webapp.interceptor.PerformanceInterceptor; @Configurationpublic class WebMvcConfigurer extends WebMvcConfigurerAdapter {   @Bean  @ConditionalOnMissingBean(CharacterEncodingFilter.class)  public CharacterEncodingFilter characterEncodingFilter() {    CharacterEncodingFilter filter = new OrderedCharacterEncodingFilter();    filter.setEncoding("UTF-8");    return filter;  }   @Override  public void addInterceptors(InterceptorRegistry registry) {    registry.addInterceptor(new PerformanceInterceptor()).addPathPatterns("/**");    super.addInterceptors(registry);  }   @Override  public void addResourceHandlers(ResourceHandlerRegistry registry) {    registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");    // registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");  } }