ConvertUtils.java

/**
 * Copyright (c) 2005-2010 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * 
 * $Id: ConvertUtils.java 1211 2010-09-10 16:20:45Z calvinxiu $
 */
package org.springside.modules.utils.reflection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.beanutils.converters.DateConverter;
import org.apache.commons.lang.StringUtils;

public class ConvertUtils {

	static {
		registerDateConverter();
	}

	/**
	 * 提取集合中的对象的属性(通过getter函数), 组合成List.
	 * 
	 * @param collection 来源集合.
	 * @param propertyName 要提取的属性名.
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public static List convertElementPropertyToList(final Collection collection, final String propertyName) {
		List list = new ArrayList();

		try {
			for (Object obj : collection) {
				list.add(PropertyUtils.getProperty(obj, propertyName));
			}
		} catch (Exception e) {
			throw ReflectionUtils.convertReflectionExceptionToUnchecked(e);
		}

		return list;
	}

	/**
	 * 提取集合中的对象的属性(通过getter函数), 组合成由分割符分隔的字符串.
	 * 
	 * @param collection 来源集合.
	 * @param propertyName 要提取的属性名.
	 * @param separator 分隔符.
	 */
	@SuppressWarnings("rawtypes")
	public static String convertElementPropertyToString(final Collection collection, final String propertyName,
			final String separator) {
		List list = convertElementPropertyToList(collection, propertyName);
		return StringUtils.join(list, separator);
	}

	/**
	 * 转换字符串到相应类型.
	 * 
	 * @param value 待转换的字符串.
	 * @param toType 转换目标类型.
	 */
	public static Object convertStringToObject(String value, Class<?> toType) {
		try {
			return org.apache.commons.beanutils.ConvertUtils.convert(value, toType);
		} catch (Exception e) {
			throw ReflectionUtils.convertReflectionExceptionToUnchecked(e);
		}
	}

	/**
	 * 定义日期Converter的格式: yyyy-MM-dd 或 yyyy-MM-dd HH:mm:ss
	 */
	private static void registerDateConverter() {
		DateConverter dc = new DateConverter();
		dc.setUseLocaleFormat(true);
		dc.setPatterns(new String[] { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss" });
		org.apache.commons.beanutils.ConvertUtils.register(dc, Date.class);
	}
}