在方法级别的java日志输出控制(一)这篇文章中主要讨论了通过properties配置文件以及AOP技术批量控制方法级别的日志输出。
用properties配置文件的好处是不用更改程序即可控制日志的输出,然而大型的应用通常是分布式的,会有很多的服务器,需要更改全部服务器上的配置文件,然后再重启应用。这将会是一件非常麻烦的事情。事实上在大型集群应用中有更好的方法实现他。zookeeper的特性决定着它有一个应用场景就是集群配置中心。本文不介绍zookeeper原理以及搭建,将直接使用zookeeper实现实时更改配置。本文表面上是做方法级别的日志输出控制在集群中的实现,但实际上完全是一个zookeeper集群配置中心的简单实现。
先看ZkHelper工具类:
package com.lf.testLog4j.Util; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.concurrent.CountDownLatch; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import org.apache.zookeeper.*; import org.apache.zookeeper.data.Stat; /** * Created by lufei3 on 2015/7/29. */ public class ZkHelper { private static final Logger logger = LogManager.getLogger(ZkHelper.class); Stat stat = null; private static ZooKeeper zk; static private ZkHelper instance; //本机搭建的zk伪集群 public static String hostports = "127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183"; //存放所有的log方法配置键值对,系统系统时会首先从zk上拿到所有的节点数据放在map里,只有当节点发生改变的时候 // 才会更新map,这样避免每取一个节点就去zk里面读数据,从而节省了io时间。 public static Map<String, String> nodeList; //等待zk连接的方法,若没有连接时会报错 public static void waitUntilConnected(ZooKeeper zooKeeper, CountDownLatch connectedLatch) { if (ZooKeeper.States.CONNECTING == zooKeeper.getState()) { try { connectedLatch.await(); } catch (InterruptedException e) { throw new IllegalStateException(e); } } } //watcher类,该watcher可以watch到zk连接以及每个节点的变化 static class ConnectedWatcher implements Watcher { private CountDownLatch connectedLatch; ConnectedWatcher(CountDownLatch connectedLatch) { this.connectedLatch = connectedLatch; } @Override public void process(WatchedEvent event) { if (event.getState() == Event.KeeperState.SyncConnected) { connectedLatch.countDown(); } logger.info("process : " + event.getType() + " " + event.getPath()); //当节点发生变化时更新map nodeListMapRefresh(String.valueOf(event.getType()), event.getPath()); } } public static void nodeListMapRefresh(String eventType, String path) { if (eventType.equals("NodeDeleted")) { nodeList.remove(path.substring(path.lastIndexOf("/") + 1)); } else if (eventType.equals("NodeCreated") || eventType.equals("NodeDataChanged")) { nodeList.put(path.substring(path.lastIndexOf("/") + 1), getNode(path)); } } //单例 public static ZkHelper Instance() { if (instance == null) { instance = new ZkHelper(hostports, 1000); } return instance; } //初始化连接并装载节点列表 public boolean Init(String hostports, int times) { try { CountDownLatch connectedLatch = new CountDownLatch(1); Watcher watcher = new ConnectedWatcher(connectedLatch); zk = new ZooKeeper(hostports, times, watcher); waitUntilConnected(zk, connectedLatch); nodeList = getNodeList("/root/log"); } catch (Exception e) { System.out.println(e); return false; } return true; } //构造方法,构造时完成初始化 ZkHelper(String hostports, int times) { Init(hostports, times); } //获取节点信息 public static String getNode(String keys) { String re = ""; String ppath = keys; Stat stat = new Stat(); try { byte[] b = zk.getData(ppath, false, stat); //获取节点的信息及存储的数据 re = new String(b); } catch (Exception e) { System.out.println(e); } return re; } //创建节点或更新节点数据 public void create(String key, String value) { try { stat = null; stat = zk.exists("/root", false); if (stat == null) { zk.create("/root", "rootData".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } stat = null; stat = zk.exists("/root/log", false); if (stat == null) { zk.create("/root/log", "logData".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } stat = null; stat = zk.exists("/root/log/" + key, true); if (stat == null) { zk.create("/root/log/" + key, value.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } else { zk.setData("/root/log/" + key, value.getBytes(), -1); } } catch (KeeperException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } } //删除节点 public void delete(String key) { stat = null; try { stat = zk.exists("/root/log/" + key, true); if (stat != null) { zk.delete("/root/log/" + key, -1); } } catch (InterruptedException e) { e.printStackTrace(); } catch (KeeperException e) { e.printStackTrace(); } } //获取节点列表 public Map getNodeList(String path) { Map<String, String> map = new HashMap<String, String>(); List<String> nodeList = null; try { nodeList = zk.getChildren(path, true); for (String s : nodeList) { byte[] bytes = zk.getData(path + "/" + s, true, null); map.put(s, new String(bytes)); } } catch (KeeperException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } return map; } }
LogConfig类:
package com.lf.zookeeperConfigCenter; import com.lf.testLog4j.Util.ZkHelper; public class LogConfig { public static void main(String args[]) { ZkHelper conf = ZkHelper.Instance(); // conf.delete("TestLogAOP.test2"); // conf.delete("TestLogAOP.test"); conf.create("TestLogAOP.test2", "{\"level\":\"TRACE\",\"on\":1}"); String str = conf.getNode("/root/log/TestLogAOP.test2"); conf.create("TestLogAOP.test", "{\"level\":\"TRACE\",\"on\":0}"); } }
这个类主要完成了zk的节点创建两个节点的路径和值分别为
/root/log/TestLogAOP.test,{"level":"TRACE","on":0}
/root/log/TestLogAOP.test2,{"level":"TRACE","on":1}与上篇的properties文件配置一致。完善的配置中心应当有一个图形界面。
LogActiveZK类:
package com.lf.testLog4j.aop; import com.google.gson.Gson; import com.lf.testLog4j.Util.ZkHelper; import com.lf.testLog4j.common.CommonLogUtil; import com.lf.testLog4j.domain.ConfigLog; import org.apache.commons.lang.StringUtils; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import org.aspectj.lang.JoinPoint; import java.util.Map; /** * Created by lufei3 on 2015/7/29. */ public class LogActiveZK { private static final Logger logger = LogManager.getLogger(LogActive.class); public void before(JoinPoint jp){ ZkHelper zkHelper = ZkHelper.Instance(); Map map = zkHelper.nodeList; Gson gson = new Gson(); ConfigLog configLog = null; String cName = jp.getThis().toString(); Object[] args = jp.getArgs(); //获得参数列表 String className = cName.substring(cName.lastIndexOf(".")+1,cName.lastIndexOf("@")); String methodName = jp.getSignature().getName(); //获得方法名 String key = className + "." + methodName; String configValue = (String) map.get(key); try { configLog = gson.fromJson(configValue,ConfigLog.class); } catch (Exception e) { logger.error("Gson Format Exception!! logLevel:{}",configValue); e.printStackTrace(); return; } if(configLog == null) { return; } String logLevel = configLog.getLevel(); int offset = configLog.getOn(); if(StringUtils.isBlank(logLevel)){ logger.warn("method:{} log not config", key); return; } if(CommonLogUtil.isInfoEnable(logLevel, offset)) { logger.info("====Method:{};", key); if(args.length <=0){ logger.info("===={}方法没有参数", methodName); } else{ for(int i=0; i<args.length; i++){ logger.info("====参数 {}:{} ", (i + 1), args[i]); } } } } public void after(){ logger.info("调用完毕!!"); } }
Spring配置:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd" default-autowire="byName"> <bean id="LogActiveZK" class="com.lf.testLog4j.aop.LogActiveZK"></bean> <!--将日志类注入到bean中。--> <bean id="testLogAOP" class="com.lf.testLog4j.service.TestLogAOP"></bean> <aop:aspectj-autoproxy proxy-target-class="true"/> <aop:config> <!--拦截service层的所有方法--> <aop:pointcut id="service" expression="execution(* com.lf.testLog4j.service.*.*(..))"/> <aop:aspect id="log" ref="LogActiveZK"> <aop:before pointcut-ref="service" method="before"/> <aop:after pointcut-ref="service" method="after"/> </aop:aspect> </aop:config> </beans>
TestLogAOP类:
package com.lf.testLog4j.service; import org.springframework.stereotype.Component; /** * Created by lufei3 on 2015/7/14. */ @Component public class TestLogAOP { public void test(){ System.out.println("测试类的test方法被调用"); } public void test2() { System.out.println("测试2的方法被调用!"); } }
测试:
package com.lf.testLog4j; import com.lf.testLog4j.service.TestLogAOP; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * Created by lufei3 on 2015/7/14. */ public class LogAOPMain { public static void main(String... args) { ApplicationContext act = new ClassPathXmlApplicationContext("spring/spring-config.xml"); TestLogAOP testLogAOP = (TestLogAOP) act.getBean("testLogAOP"); testLogAOP.test(); testLogAOP.test2(); } }
结果:
可见成功用zk作为log配置中心并通过Spring AOP拦截了方法级别的log输出。
时间: 2024-10-24 11:48:30