对javabean的内省操作

 

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 java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;

public class IntroSpectorTest {

 /**
  * @param args
  */
 public static void main(String[] args) throws Exception {
  // 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;
  
  setProperties(pt1, propertyName, value);

  System.out.println(BeanUtils.getProperty(pt1, "x").getClass().getName());
  BeanUtils.setProperty(pt1, "x", "9");
  System.out.println(pt1.getX());
  /*
  //java7的新特性
  Map map = {name:"zxx",age:18};
  BeanUtils.setProperty(map, "name", "lhm");
  */
  BeanUtils.setProperty(pt1, "birthday.time", "111");
  System.out.println(BeanUtils.getProperty(pt1, "birthday.time"));
  
  PropertyUtils.setProperty(pt1, "x", 9);
  System.out.println(PropertyUtils.getProperty(pt1, "x").getClass().getName());
  
 }

 private static void setProperties(Object pt1, String propertyName,
   Object value) throws IntrospectionException,
   IllegalAccessException, InvocationTargetException {
  PropertyDescriptor pd2 = new PropertyDescriptor(propertyName,pt1.getClass());
  Method methodSetX = pd2.getWriteMethod();
  methodSetX.invoke(pt1,value);
 }

 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;
 }

}