Spring MVC Interceptor 实现性能监控

利用Spring MVC 的 Interceptor 实现个简易的性能监控,计算一下每个url的执行时间

在 preHandle 方法中记录当前的时间戳到线程局部变量里,然后在afterCompletion方法中,用当前的时间戳剪掉线程局部变量里的时间戳得出个运行时间,并记录到log里。

这只是个简易的性能监控,如果想长期正式的监控性能,请选择其它成熟的产品

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<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);
    }
 
}

这里的是NamedThreadLocal没啥神器的,源码如下:

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;
    }
 
}

定义完Interceptor,注册即可。

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/");
    }
 
}

原文 

http://www.school1024.com/spring-framework/spring-mvc-interceptor-实现性能监控.html

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