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代理模式

代理類，可以代理任何接口封裝的類

package com.lucky.proxy.util;
2

import java.lang.reflect.InvocationHandler;
4

import java.lang.reflect.Method;
5

import java.lang.reflect.Proxy;
6

public class ProxyMode implements InvocationHandler {
8

private static ProxyMode instance = null;
9

private Object delegete;
11

private ProxyMode(){
13

}
14

public static ProxyMode getInstance(){
16

if (null == instance) {
17

instance = new ProxyMode();
18

}
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return instance;
20

}
21

public Object bind(Object delegete){
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this.delegete = delegete;
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return Proxy.newProxyInstance(delegete.getClass().getClassLoader(), delegete.getClass().getInterfaces(), this);
25

}
26

public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
28

// TODO Auto-generated method stub
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System.out.println("調用了InvoactionHandler的invoke方法..");
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Object result = method.invoke(delegete, args);
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return result;
32

}
33

}
35

接口

package com.lucky.proxy;
2

public interface IProxyClass {
4

public String sayHello(String str);
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public void print();
6

public String getInnerStr();
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}
8

接口實現類

package com.lucky.proxy;
2

public class ProxyClass implements IProxyClass {
4

private String innerStr;
5

public ProxyClass(){}
6

public ProxyClass(String str){
7

innerStr = str;
8

}
9

public String getInnerStr() {
10

return innerStr;
11

}
12

public void setInnerStr(String innerStr) {
13

this.innerStr = innerStr;
14

}
15

public void print() {
16

// TODO Auto-generated method stub
17

System.out.println("調用代理實現類打印信息");
18

}
19

public String sayHello(String str) {
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// TODO Auto-generated method stub
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System.out.println(str+" 你好!");
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return str+" 你好!";
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}
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}
27

測試類

package com.lucky.proxy.test;
2

import com.lucky.proxy.IProxyClass;
4

import com.lucky.proxy.IProxyClass2;
5

import com.lucky.proxy.ProxyClass;
6

import com.lucky.proxy.ProxyClass2;
7

import com.lucky.proxy.util.ProxyMode;
8

public class ProxyTest {
10

/**
12

* @param args
13

*/
14

public static void main(String[] args) {
15

// TODO Auto-generated method stub
16

IProxyClass proxyInterface = (IProxyClass) ProxyMode.getInstance().bind(new ProxyClass("構造"));
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proxyInterface.sayHello("李彬");
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proxyInterface.print();
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System.out.println(proxyInterface.getInnerStr());
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// IProxyClass2 proxyInterface = (IProxyClass2) ProxyMode.getInstance().bind(new ProxyClass2());
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// proxyInterface.sayHello("李彬");
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// proxyInterface.print();
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}
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}
30

用反射實現代理模式

package com.lucky.proxy.util;
2

public class ProxyReflectMode {
4

private static ProxyReflectMode instance = null;
5

private ProxyReflectMode(){}
7

public static ProxyReflectMode getInstance(){
9

if (null == instance) {
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instance = new ProxyReflectMode();
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}
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return instance;
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}
14

public Object getProxyObject(Class cls){
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String className = cls.getName();
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Object obj = null;
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try {
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obj = Class.forName(className).newInstance();
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} catch (InstantiationException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
23

} catch (IllegalAccessException e) {
24

// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (ClassNotFoundException e) {
27

// TODO Auto-generated catch block
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e.printStackTrace();
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}
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return obj;
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}
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}
33

posted on 2007-09-22 21:59 禮物閱讀(389) 評論(1) 編輯收藏

Terry.Li-彬

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