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。
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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 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：{} 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 NamedThreadLocalextends 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/");
}
}
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创新互联。
