proxyclass.html

来自「java类库详细讲解」· HTML 代码 · 共 154 行

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<TITLE>Creating a Proxy Object
(Java Developers Almanac Example)
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  <h3>
    e111.  
    Creating a Proxy Object</h3>


<pre>
    public interface <font color="#0066ff"><i>MyInterface</i></font> {
        void method();
    }
    
    public class <font color="#0066ff"><i>MyInterfaceImpl</i></font> implements <font color="#0066ff"><i>MyInterface</i></font> {
        public void method() {
        }
    }
    
    public class <font color="#0066ff"><i>ProxyClass</i></font> implements InvocationHandler {
        Object obj;
        public <font color="#0066ff"><i>ProxyClass</i></font>(Object o) {
            obj = o;
        }
    
        public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
            Object result = null;
            try {
                // Do something before the method is called ...
                result = m.invoke(obj, args);
            } catch (InvocationTargetException e) {
            } catch (Exception eBj) {
            } finally {
                // Do something after the method is called ...
            }
            return result;
        }
    }
    
    // This fragment creates a proxy for a <font color="#0066ff"><i>MyInterface</i></font> object.
    <font color="#0066ff"><i>MyInterface</i></font> myintf = (<font color="#0066ff"><i>MyInterface</i></font>)Proxy.newProxyInstance(
        <font color="#0066ff"><i>MyInterface</i></font>.class.getClassLoader(),
        new Class[]{<font color="#0066ff"><i>MyInterface</i></font>.class},
        new <font color="#0066ff"><i>ProxyClass</i></font>(new <font color="#0066ff"><i>MyInterfaceImpl</i></font>()));
    
    // Invoke the method
    myintf.method();
</pre>
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            &nbsp;Related Examples
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e109. <a class="eglink" href="Names.html?l=rel">
    Getting the Name of a Member Object
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e110. <a class="eglink" href="SetAccessible.html?l=rel">
    Overriding Default Access
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        See also: 
<a class="eglink" href="/egs/java.lang.reflect/pkg.html?l=rel#Arrays">
    Arrays
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<a class="eglink" href="/egs/java.lang.reflect/pkg.html?l=rel#Constructors">
    Constructors
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<a class="eglink" href="/egs/java.lang.reflect/pkg.html?l=rel#Fields">
    Fields
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<a class="eglink" href="/egs/java.lang.reflect/pkg.html?l=rel#Methods">
    Methods
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<a class="eglink" href="/egs/java.lang.reflect/pkg.html?l=rel#Modifiers">
    Modifiers
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