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Java 检索给定属性的属性描述符对象。

欢马劈雪

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检索给定属性的属性描述符对象。

实例源码：

源代码：

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//来自 N o w  J a v a  .   c o m

* The contents of this file are subject to the Sapient Public License

* Version 1.0 (the "License"); you may not use this file except in compliance

* with the License. You may obtain a copy of the License at

* http://carbon.sf.net/License.html.

* Software distributed under the License is distributed on an "AS IS" basis,

* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for

* the specific language governing rights and limitations under the License.

* The Original Code is The Carbon Component Framework.

* The Initial Developer of the Original Code is Sapient Corporation

//package com.nowjava;

import java.beans.BeanInfo;

import java.beans.IntrospectionException;

import java.beans.Introspector;

import java.beans.PropertyDescriptor;

public class Main {

public static void main(String[] argv) throws Exception {

String propertyName = "nowjava.com";

Class beanClass = String.class;

System.out.println(getPropertyDescriptor(propertyName, beanClass));

}

/**

* Retrieves a property descriptor object for a given property.

* <p>

* Uses the classes in <code>java.beans</code> to get back

* a descriptor for a property.  Read-only and write-only

* properties will have a slower return time.

* </p>

* @param propertyName The programmatic name of the property

* @param beanClass The Class object for the target bean.

*                  For example sun.beans.OurButton.class.

* @return a PropertyDescriptor for a property that follows the

*         standard Java naming conventions.

* @throws PropertyNotFoundException indicates that the property

*         could not be found on the bean class.

*///N o w J a v a . c o m - 时  代  Java 提供

private static final PropertyDescriptor getPropertyDescriptor(

String propertyName, Class beanClass) {

PropertyDescriptor resultPropertyDescriptor = null;

char[] pNameArray = propertyName.toCharArray();

pNameArray[0] = Character.toLowerCase(pNameArray[0]);

propertyName = new String(pNameArray);

try {

resultPropertyDescriptor = new PropertyDescriptor(propertyName,

beanClass);

} catch (IntrospectionException e1) {

// Read-only and write-only properties will throw this

// exception.  The properties must be looked up using

// brute force.

// This will get the list of all properties and iterate

// through looking for one that matches the property

// name passed into the method.

try {

BeanInfo beanInfo = Introspector.getBeanInfo(beanClass);

PropertyDescriptor[] propertyDescriptors = beanInfo

.getPropertyDescriptors();

for (int i = 0; i < propertyDescriptors.length; i++) {

if (propertyDescriptors[i].getName().equals(

propertyName)) {

// If the names match, this this describes the

// property being searched for.  Break out of
/**代码未完, 请加载全部代码(NowJava.com).**/

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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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