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Java 返回给定bean类中属性的类型
返回给定bean类中属性的类型
实例源码：
源代码：
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/**3
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* JLibs: Common Utilities for Java5
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* Copyright (C) 2009 Santhosh Kumar T <santhosh.tekuri@gmail.com>7
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*9
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* This library is free software; you can redistribute it and/or11
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* modify it under the terms of the GNU Lesser General Public13
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* License as published by the Free Software Foundation; either15
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* version 2.1 of the License, or (at your option) any later version.17
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*19
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* This library is distributed in the hope that it will be useful,21
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* but WITHOUT ANY WARRANTY; without even the implied warranty of23
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU25
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* Lesser General Public License for more details.27
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*/29
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//package com.nowjava;31
/* 32
来自 33
*N o w J a v a . c o m - 时代Java*/34
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import java.lang.reflect.Method;37
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import java.util.Locale;39
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public class Main {42
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public static void main(String[] argv) throws Exception {44
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Class beanClass = String.class;46
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String property = "nowjava.com";48
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System.out.println(getPropertyType(beanClass, property));50
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}52
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/** prefix used by non-boolean getter methods */55
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public static final String GET = "get";57
/**58
* n o w j a v a . c o m - 时 代 Java 提 供 59
**/60
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/** prefix used by boolean getter methods */62
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public static final String IS = "is";64
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/**67
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* Returns the type of <code>property</code> in given <code>beanClass</code>69
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*71
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* @param beanClass bean class73
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* @param property name of the property75
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* 77
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* @return null if the property is not found. otherwise returns the type of the <code>property</code>79
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*/81
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public static Class getPropertyType(Class<?> beanClass, String property) {83
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Method getter = getGetterMethod(beanClass, property);85
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if (getter == null)87
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return null;89
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else91
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return getter.getReturnType();93
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}95
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/**98
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* Returns getter method for <code>property</code> in specified <code>beanClass</code>100
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*102
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* @param beanClass bean class104
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* @param property name of the property106
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*108
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* @return getter method. null if <code>property</code> is not found110
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*112
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* @see #getGetterMethod(Class, String, Class)114
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*/116
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public static Method getGetterMethod(Class<?> beanClass, String property) {118
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try {120
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return beanClass.getMethod(GET + getMethodSuffix(property));122
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} catch (NoSuchMethodException ex1) {124
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try {126
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return beanClass.getMethod(IS + getMethodSuffix(property));128
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} catch (NoSuchMethodException ex2) {130
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return null;132
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}134
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}136
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}138
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/**141
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* Returns getter method for <code>property</code> in specified <code>beanClass</code>143
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*145
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* @param beanClass bean class147
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* @param property name of the property149
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* @param propertyType type of the property. This is used to compute getter method name.151
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*153
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* @return getter method. null if <code>property</code> is not found155
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*157
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* @see #getGetterMethod(Class, String)159
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*/161
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public static Method getGetterMethod(Class<?> beanClass,163
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String property, Class propertyType) {165
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try {167
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try {169
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if (propertyType == boolean.class)171
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return beanClass.getMethod(IS173
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+ getMethodSuffix(property));175
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} catch (NoSuchMethodException ignore) {177
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// ignore179
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}181
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return beanClass.getMethod(GET + getMethodSuffix(property));183
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} catch (NoSuchMethodException ex) {185
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return null;187
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}189
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}191
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public static String getMethodSuffix(String property) {194
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switch (property.length()) {196
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case 0:198
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throw new IllegalArgumentException("invalid property name: "200
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+ property);202
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case 1:204
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return property.toUpperCase(Locale.ENGLISH);206
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default:208
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