SpringMVCInterceptor實現(xiàn)性能監(jiān)控的功能代碼

利用Spring MVC 的 Interceptor 實現(xiàn)個簡易的性能監(jiān)控，計算一下每個url的執(zhí)行時間。

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在 preHandle 方法中記錄當(dāng)前的時間戳到線程局部變量里，然后在afterCompletion方法中，用當(dāng)前的時間戳剪掉線程局部變量里的時間戳得出個運行時間，并記錄到log里。

這只是個簡易的性能監(jiān)控，如果想長期正式的監(jiān)控性能，請選擇其它成熟的產(chǎn)品。

Interceptor

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 startTimeThreadLocal = new NamedThreadLocal("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：{} 執(zhí)行了 {} 毫秒", request.getRequestURI(), executeTime);
  }
 
}

這里的是NamedThreadLocal沒啥神器的，源碼如下：

package org.springframework.core;
 
import org.springframework.util.Assert;
 
public class NamedThreadLocal extends ThreadLocal {
 
  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;
  }
 
}

定義完Interceptor，注冊即可。

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;
 
@Configuration
public 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/");
  }
 
}

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