JavaBean的问题 - 黑马程序员技术交流社区

package cn.itast;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.commons.beanutils.BeanUtils;
public class IntroSpector {
public static void main(String[] args) throws IntrospectionException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
// TODO Auto-generated method stub
ReflectPoint pt1 = new ReflectPoint(3, 5);
String propertyName = "x";
//"x"-->"X"-->"getX"-->methodGetX-->
Object retVal = getProperty(pt1, propertyName);
System.out.println(retVal);
Object value = 7;
setProperty(pt1, propertyName, value);
BeanUtils.getProperty(pt1,"x");
System.out.println(pt1.getX());
}
private static void setProperty(ReflectPoint pt1, String propertyName,
Object value) throws IntrospectionException,
IllegalAccessException, InvocationTargetException {
PropertyDescriptor pd2 = new PropertyDescriptor(propertyName, pt1.getClass());
Method methodSetX = pd2.getWriteMethod();
methodSetX.invoke(pt1,value);
}j
private static Object getProperty(Object pt1, String propertyName)
throws IntrospectionException, IllegalAccessException,
InvocationTargetException {
/*PropertyDescriptor pd = new PropertyDescriptor(propertyName, pt1.getClass());
Method methodGetX = pd.getReadMethod();
Object retVal = methodGetX.invoke(pt1);*/
BeanInfo beanInfo = Introspector.getBeanInfo(pt1.getClass());
PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
Object retVal = null;
for(PropertyDescriptor pd : pds){
if(pd.getName().equals(propertyName)){
Method methodGetX = pd.getReadMethod();
retVal = methodGetX.invoke(pt1);
break;
}
}
return retVal;
}
}

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