use interceptor to log informations (J2EE 六利用interceptor 打Log)_J2EE

use interceptor to log informations (J2EE 6 利用interceptor 打Log)

import javax.interceptor.AroundInvoke;

import javax.interceptor.Interceptor;

import javax.interceptor.InvocationContext;

Here is the example :

? ? ? ? 1.Define the annotationfor interceptor

//@Inheritedto specify that the annotation can

//be inherited from superclasses

@Inherited

@InterceptorBinding

@Retention(RetentionPolicy.RUNTIME)

@Target({TYPE, METHOD})

public @interface Logged {

}

2. Define the interceptor

@Logged

@Interceptor

public class LoggedInterceptor implements Serializable {

?????? private static final long serialVersionUID = 274175956305979479L;

?????? public LoggedInterceptor() {

??? }

??? @AroundInvoke

??? public Object logMethodEntry(InvocationContext invocationContext)

??????????? throws Exception {

??????? System.out.println("Entering method: "

??????????????? + invocationContext.getMethod().getName() + " in class "

??????????????? + invocationContext.getMethod().getDeclaringClass().getName()+"—start”);

??????? Object o = invocationContext.proceed();

??????? System.out.println("Entering method: "

??????? ????????+ invocationContext.getMethod().getName() + " in class "

??????????????? + invocationContext.getMethod().getDeclaringClass().getName()+"--end");

??????? return o;

??? }

}

???????????? <class>com.interceptors.LoggedInterceptor</class>

??????? </interceptors>? ? add this inbeans.xml to register the interceptor .

3.?Use the inceptor : just put the annotation upon the method you want logsomething

@Logged

?????? public String redirectUrlTest (){

?????????????

????????????? return "detail.jsf";

?????? }

???????????here is the output

Entering method: redirectUrlTest in class com.test.render.TestMB--start

15:06:18,372 INFO? [stdout] (http-localhost/127.0.0.1:8080-1) hi you are the best? James ! Gentle

15:06:18,373 INFO? [stdout] (http-localhost/127.0.0.1:8080-1) Entering method: redirectUrlTest in class com.test.render.TestMB--end

use interceptor to log informations (J2EE 六 利用interceptor 打Log)