我要评论java 创建动态类和查看方法列表信息的实例
sample code :
import java.lang.reflect.constructor;
import java.lang.reflect.invocationhandler;
import java.lang.reflect.method;
import java.lang.reflect.proxy;
import java.lang.reflect.type;
import java.util.arraylist;
import java.util.collection;
public class proxytest {
public static void main(string[] args) throws exception {
// todo auto-generated method stub
class clazzproxy = proxy.getproxyclass(collection.class.getclassloader(), collection.class);
system.out.println(clazzproxy);
system.out.println("------constructor method list ------");
constructor[] constructors = clazzproxy.getconstructors();
for(constructor constructor:constructors){
stringbuilder sb = new stringbuilder(constructor.getname());
sb.append("(");
type[] parametertypes = constructor.getparametertypes();
for(type parametertype:parametertypes){
sb.append(parametertype.tostring()+",");
}
if(parametertypes.length>0){
sb.deletecharat(sb.length()-1);
}
sb.append(")");
system.out.println(sb.tostring());
}
system.out.println("------constructor method list ------\n\n");
system.out.println("------ method list ------");
method[] methods = clazzproxy.getmethods();
for(method method:methods){
stringbuilder sb2 = new stringbuilder(method.getname());
sb2.append("(");
type[] parametertypes = method.getparametertypes();
for(type parametertype:parametertypes){
sb2.append(parametertype.tostring()+",");
}
if(parametertypes.length>0){
sb2.deletecharat(sb2.length()-1);
}
sb2.append(")");
system.out.println(sb2.tostring());
}
system.out.println("------ method list ------");
constructor proxyconstructor = clazzproxy.getconstructor(invocationhandler.class);
class myinvocationhandler implements invocationhandler{
arraylist target = new arraylist();
public object invoke(object proxy, method method, object[] args)
throws throwable {
object obj = method.invoke(target, args);
return obj;
}
}
myinvocationhandler mih = new myinvocationhandler();
collection collectionproxy = (collection) proxyconstructor.newinstance(mih);
collectionproxy.add("zhuang");
collectionproxy.add("alex");
system.out.println("collectionproxy size:"+collectionproxy.size());
collection collectionproxy2 = (collection)proxy.newproxyinstance(collection.class.getclassloader(),new class[] {collection.class},new invocationhandler(){
arraylist target = new arraylist();
public object invoke(object proxy, method method, object[] args)
throws throwable {
object obj = method.invoke(target, args);
return obj;
}
});
collectionproxy2.add("one");
collectionproxy2.add("two");
collectionproxy2.add("three");
system.out.println("collectionproxy2 size:"+collectionproxy2.size());
}
运行结果：
class $proxy0 ------constructor method list ------ $proxy0(interface java.lang.reflect.invocationhandler) ------constructor method list ------ ------ method list ------ add(class java.lang.object) hashcode() equals(class java.lang.object) clear() tostring() contains(class java.lang.object) isempty() addall(interface java.util.collection) iterator() size() toarray(class [ljava.lang.object;) toarray() remove(class java.lang.object) containsall(interface java.util.collection) removeall(interface java.util.collection) retainall(interface java.util.collection) isproxyclass(class java.lang.class) getproxyclass(class java.lang.classloader,class [ljava.lang.class;) newproxyinstance(class java.lang.classloader,class [ljava.lang.class;,interface java.lang.reflect.invocationhandler) getinvocationhandler(class java.lang.object) wait() wait(long,int) wait(long) getclass() notify() notifyall() ------ method list ------ collectionproxy size:2 collectionproxy2 size:3
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