Java反射经典实例 Java Reflection Cookbook

Http://www.duduwolf.com/wiki/2006/85.html[@more@]import java.lang.reflect.Array;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;


publicclass Reflection {

public Object getProperty(Object owner, String fieldName) throws Exception {
Class ownerClass = owner.getClass();

Field field = ownerClass.getField(fieldName);

Object property = field.get(owner);

return property;
}


public Object getStaticProperty(String className, String fieldName)
throws Exception {
Class ownerClass = Class.forName(className);

Field field = ownerClass.getField(fieldName);

Object property = field.get(ownerClass);

return property;
}



public Object invokeMethod(Object owner, String methodName, Object[] args)
throws Exception {

Class ownerClass = owner.getClass();

Class[] argsClass =new Class[args.length];

for (int i =0, j = args.length; i < j; i++) {
argsClass[i] = args[i].getClass();
}

Method method = ownerClass.getMethod(methodName, argsClass);

return method.invoke(owner, args);
}



public Object invokeStaticMethod(String className, String methodName,
Object[] args) throws Exception {
Class ownerClass = Class.forName(className);

Class[] argsClass =new Class[args.length];

for (int i =0, j = args.length; i < j; i++) {
argsClass[i] = args[i].getClass();
}

Method method = ownerClass.getMethod(methodName, argsClass);

return method.invoke(null, args);
}




public Object newInstance(String className, Object[] args) throws Exception {
Class newoneClass = Class.forName(className);

Class[] argsClass =new Class[args.length];

for (int i =0, j = args.length; i < j; i++) {
argsClass[i] = args[i].getClass();
}

Constructor cons = newoneClass.getConstructor(argsClass);

return cons.newInstance(args);

}




publicboolean isInstance(Object obj, Class cls) {
return cls.isInstance(obj);
}


public Object getByArray(Object array, int index) {
return Array.get(array,index);
}
}