我要评论利用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/");
}
}
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移动技术网。
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