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;
@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/");
}
}
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。