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Java 检索给定属性的属性描述符对象。
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 m2
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/*4
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* The contents of this file are subject to the Sapient Public License6
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* Version 1.0 (the "License"); you may not use this file except in compliance8
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* with the License. You may obtain a copy of the License at10
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* http://carbon.sf.net/License.html.12
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*14
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* Software distributed under the License is distributed on an "AS IS" basis,16
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for18
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* the specific language governing rights and limitations under the License.20
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*22
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* The Original Code is The Carbon Component Framework.24
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*26
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* The Initial Developer of the Original Code is Sapient Corporation28
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*30
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* Copyright (C) 2003 Sapient Corporation. All Rights Reserved.32
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*/34
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//package com.nowjava;36
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import java.beans.BeanInfo;38
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import java.beans.IntrospectionException;40
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import java.beans.Introspector;42
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import java.beans.PropertyDescriptor;44
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public class Main {47
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public static void main(String[] argv) throws Exception {49
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String propertyName = "nowjava.com";51
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Class beanClass = String.class;53
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System.out.println(getPropertyDescriptor(propertyName, beanClass));55
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}57
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/**60
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* Retrieves a property descriptor object for a given property.62
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* <p>64
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* Uses the classes in <code>java.beans</code> to get back66
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* a descriptor for a property. Read-only and write-only68
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* properties will have a slower return time.70
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* </p>72
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*74
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* @param propertyName The programmatic name of the property76
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* @param beanClass The Class object for the target bean.78
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* For example sun.beans.OurButton.class.80
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* @return a PropertyDescriptor for a property that follows the82
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* standard Java naming conventions.84
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* @throws PropertyNotFoundException indicates that the property86
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* could not be found on the bean class.88
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*///N o w J a v a . c o m - 时 代 Java 提供90
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private static final PropertyDescriptor getPropertyDescriptor(92
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String propertyName, Class beanClass) {94
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PropertyDescriptor resultPropertyDescriptor = null;97
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char[] pNameArray = propertyName.toCharArray();100
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pNameArray[0] = Character.toLowerCase(pNameArray[0]);102
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propertyName = new String(pNameArray);104
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try {107
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resultPropertyDescriptor = new PropertyDescriptor(propertyName,109
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beanClass);111
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} catch (IntrospectionException e1) {113
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// Read-only and write-only properties will throw this115
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// exception. The properties must be looked up using117
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// brute force.119
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// This will get the list of all properties and iterate122
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// through looking for one that matches the property124
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// name passed into the method.126
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try {128
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BeanInfo beanInfo = Introspector.getBeanInfo(beanClass);130
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PropertyDescriptor[] propertyDescriptors = beanInfo133
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.getPropertyDescriptors();135
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for (int i = 0; i < propertyDescriptors.length; i++) {138
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if (propertyDescriptors[i].getName().equals(140
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propertyName)) {142
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// If the names match, this this describes the145
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// property being searched for. Break out of147
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