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AOP—代理對象

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1．? 攔截所有業務方法

2．? 判斷用戶是否有權限，由權限就允許它執行業務方法，沒有權限不允許執行業務方法。

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代理對象創建由兩種：靜態代理，動態代理

應用的條件是目標對象必須實現接口

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橫切性關注點

Source:

public interface PersonService {

?????? public void save(String name);

?????? public void update(String name, Integer personid);

?????? public String getPersonName(Integer personid);

}

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public class PersonServiceBean implements PersonService {

?????? private String user = null;

??????

?????? public PersonServiceBean() {

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

?????? }

??????

?????? public PersonServiceBean(String user) {

????????????? this.user = user;

?????? }

??????

?????? public String getPersonName(Integer personid) {

????????????? // TODO Auto-generated method stub

????????????? System.out.println("I'm getPersonName.");

????????????? return "XXX";

?????? }

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?????? public void save(String name) {

????????????? // TODO Auto-generated method stub

????????????? System.out.println("I'm save.");

?????? }

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?????? public void update(String name, Integer personid) {

????????????? // TODO Auto-generated method stub

????????????? System.out.println("I'm update.");

?????? }

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?????? public String getUser() {

????????????? return user;

?????? }

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}

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public class JDKProxyFactory implements InvocationHandler {

?????? private Object targetObject;

??????

?????? public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

????????????? // TODO Auto-generated method stub

????????????? PersonServiceBean bean = (PersonServiceBean) this.targetObject;

????????????? Object result = null;

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

????????????? if (bean.getUser() != null) {

???????????????????? result = method.invoke(targetObject, args);

????????????? }

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

????????????? return result;

?????? }

??????

?????? public Object createProxyInstance(Object targetObject) {

????????????? this.targetObject = targetObject;

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

????????????? return Proxy.newProxyInstance(this.targetObject.getClass().getClassLoader(),

??????????????????????????? this.targetObject.getClass().getInterfaces(), this);

?????? }

}

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public class AOPTest {

?????? @Test

?????? public void proxyTest() {

????????????? JDKProxyFactory factory = new JDKProxyFactory();

????????????? PersonService service = (PersonService) factory.createProxyInstance(new PersonServiceBean());

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

????????????? service.getPersonName(1);

?????? }

}

轉載于:https://www.cnblogs.com/tongzhiyong/archive/2009/02/09/1387067.html

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