第一种:
public class TimeBook {
private Logger logger = Logger.getLogger(this.getClass().getName());
//审核数据的相关程序
public void doAuditing(String name){
logger.log(Level.INFO, name + "开始审核数据...");
System.out.println("审核程序");
logger.log(Level.INFO, name + "审核数据结束...");
}
}
//TestHelloWorld.java
package com.gc.test;
import com.gc.action.TimeBook;
public class TestHelloWorld {
public static void main(String[] args){
TimeBook timeBook = new TimeBook();
timeBook.doAuditing("张三");
}
}
public class TimeBook implements TimeBookInterface {
//审核数据的相关程序
public void doAuditing(String name){
System.out.println("审核程序");
}
}
//TimeBookProxy.java
package com.gc.action;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import com.gc.impl.TimeBookInterface;
public class TimeBookProxy {
private Logger logger = Logger.getLogger(this.getClass().getName());
private TimeBookInterface timeBookInterface;
//在该类中针对前面的接口TimeBookInterface编程,而不是针对具体的类
public TimeBookProxy(TimeBookInterface timeBookInterface){
this.timeBookInterface = timeBookInterface;
}
//实际业务处理
public void doAuditing(String name){
logger.log(Level.INFO,"开始审核数据 "+name);
timeBookInterface.doAuditing(name);
logger.log(Level.INFO,"审核数据结束 "+name);
}
}
public class TestHelloWorld {
public static void main(String[] args){
TimeBookProxy timeBookProxy = new TimeBookProxy(new TimeBook());
timeBookProxy.doAuditing("张三");
}
}
第三种:使用java的代理机制进行日志输出
public class LogProxy implements InvocationHandler{
private Logger logger = Logger.getLogger(this.getClass().getName());
private Object delegate;
//绑定代理对象
public Object bind(Object delegate){
this.delegate = delegate;
return Proxy.newProxyInstance(delegate.getClass().getClassLoader(),
delegate.getClass().getInterfaces(),this);
}
//针对接口编程
public Object invoke(Object proxy,Method method,Object[] args) throws Throwable {
Object result = null;
try{
//在方法调用前后进行日志输出
logger.log(Level.INFO,args[0]+" 开始审核数据...");
result = method.invoke(delegate, args);
logger.log(Level.INFO,args[0]+" 审核数据结束...");
}catch(Exception e){
logger.log(Level.INFO,e.toString());
}
return result;
}
}
//TimeBookInterface.java
package com.gc.impl;
//针对接口编程
public interface TimeBookInterface {
public void doAuditing(String name);
}
//TimeBook.java
public class TimeBook implements TimeBookInterface {
//审核数据的相关程序
public void doAuditing(String name){
System.out.println("审核程序");
}
}
//TestHelloWorld.java
public class TestHelloWorld {
public static void main(String[] args){
//实现了对日志类的重用
LogProxy logProxy = new LogProxy();
TimeBookInterface timeBookProxy = (TimeBookInterface)logProxy.bind(new TimeBook());
timeBookProxy.doAuditing("张三");
}
}