AOPImpl.java

==================

package salesdepart.service.app;
import org.aspectj.lang.annotation.*;
import org.aspectj.lang.*;


import org.springframework.core.annotation.Order;


import java.util.*;


@Aspect
@Order(2)
public class AOPImpl {

//apply to salesdepart.service.app'all classes's methods
@Before("execution(* salesdepart.service.app.*.*(..))")
public void applySecondauth(){
System.out.println("@Order(2)

[email protected] Apply applySecondauth() ===>");

System.out.println("@Order(2) [email protected] Apply applySecondauth() <===");
}
 
@AfterReturning(returning="rvt"
, pointcut="execution(* salesdepart.service.app.*.*(..))")
public void log(Object rvt){
System.out.println("[email protected]  begin ===>");
System.out.println("AOP apply AfterReturningAOP(). return value:" + rvt);
System.out.println("record it to logs file...");
System.out.println("[email protected] end <==");
}

@After("execution(* salesdepart.service.app.*.*(..))")
public void release(JoinPoint jp)
{
System.out.println("

[email protected] ：begin ===>");
//返回被織入增強處理的目標方法
System.out.println("[email protected]： weave name: "
+ jp.getSignature().getName());
//訪問執行目標方法的引數
System.out.println("[email protected]：this method args："
+ Arrays.toString(jp.getArgs()));
//訪問被增強處理的目標物件
System.out.println("[email protected]：target to be weavered: "
+ jp.getTarget());
System.out.println("[email protected]：ends <====");
}

 @Around("execution(* salesdepart.service.app.*.*(..))")
public Object processTx(ProceedingJoinPoint jp)
throws java.lang.Throwable
{
System.out.println("[email protected] begin ===>");
//訪問執行目標方法的引數
Object[] args = jp.getArgs();
//當執行目標方法的引數存在，
//且第一個引數是字串引數
if (args != null && args.length > 0
&& args[0].getClass() == String.class)
{
//改變第一個目標方法的第一個引數
args[0] = "around changed your parameter";
}
//執行目標方法，並儲存目標方法執行後的返回值
Object rvt = jp.proceed(args);
System.out.println("[email protected] end <===");
return rvt;
}
 
 @AfterThrowing(throwing="ex"
, pointcut="execution(* salesdepart.service.app.*.*(..))")
public void doRecoveryActions(Throwable ex)
{
       System.out.println("[email protected] begin ===>");
System.out.println("[email protected] : exception from target method:" + ex);
System.out.println("[email protected] : take some actions");
System.out.println("[email protected]  end <===");
}


}

AOPImpl2.java

==================

package salesdepart.service.app;

import org.aspectj.lang.annotation.*;
import org.aspectj.lang.*;
import org.springframework.core.annotation.Order;
import java.util.Arrays;


@Aspect
@Order(1)
public class AOPImpl2 {
//定義Before增強處理執行 as first step
@Before("execution(* salesdepart.service.app.*.*(..))")
public void FirstStepAuth(JoinPoint jp)
{
System.out.println("@Order(1) [email protected]: apply 1st auth check begin ==>");
System.out.println("@Order(1) [email protected]: apply 1st auth check end <==");
}
}

SalesDepartEmployee .java

====================

package salesdepart.service.app;


import org.springframework.beans.factory.annotation.Autowired;      
import org.springframework.stereotype.*;


import java.util.*;


@Component("SalesEmployee")
public class SalesDepartEmployee implements employee {

//@Autowired預設按型別裝配，@Resource預設按名稱裝配
private String name;

//預設按型別裝配
private DummyDAO mydao;

public SalesDepartEmployee() {
System.out.println(" SalesDepartEmployee() called");
name=" default";
mydao=null;
}

@Override
public void displayInfo() {
 System.out.println("this is Sales depart' employee "+name);
}

public void setName(String name) {
this.name=name;
}

public String getName() {
return name;
}


}

BeanTest .java

===========

package salesdepart.service.app;
import org.springframework.context.*;
import org.springframework.context.support.*;


import java.util.*;
public class BeanTest { 
public static void main(String[] args) {
ApplicationContext ctx = new
ClassPathXmlApplicationContext("employee.xml");
employee p=(employee)ctx.getBean("SalesEmployee");
p.displayInfo();
}
}

=========

輸出結果

=============

DummyDAO() called

 SalesDepartEmployee() called

@Order(1) [email protected]: apply 1st auth check begin ==>
@Order(1) [email protected]: apply 1st auth check end <==

[email protected] begin ===>

@Order(2) [email protected] Apply applySecondauth() ===>

@Order(2) [email protected] Apply applySecondauth() <===

this is Sales depart' employee  default

[email protected] end <===

[email protected] ：begin ===>
[email protected]： weave name: displayInfo
[email protected]：this method args：[]
[email protected]：target to be weavered: [email protected]
[email protected]：ends <====
[email protected]  begin ===>
AOP apply AfterReturningAOP(). return value:null
record it to logs file...

[email protected] end <==

從上面可以看出：

Spring首先執行依賴注入，呼叫無引數建構函式，完成物件初始化。

當執行呼叫方法時候，

首先執行第一個

Before(1) begin

Before(1) end

Invoke() begin

Before(2) begin

Before(2) end

被攔截的方法執行()

invoke() end

after() begin

after() end

AfterReturning() begin

AfterReturning() end