BeanUtils與PropertyUtils區別以及java.util.Date發生異常問題： 除BeanUtils外還有一個名為PropertyUtils的工具類，它也提供copyProperties()方法，作用與BeanUtils的同名方法十分相似，主要的區別在于后者提供類型轉換功能，即發現兩個JavaBean的同名屬性為不同類型時，在支持的數據類型范圍內進行轉換，而前者不支持這個功能，但是速度會更快一些。BeanUtils支持的轉換類型如下：
????* java.lang.BigDecimal
????* java.lang.BigInteger
????* boolean and java.lang.Boolean
????* byte and java.lang.Byte
????* char and java.lang.Character
????* java.lang.Class
????* double and java.lang.Double
????* float and java.lang.Float
????* int and java.lang.Integer
????* long and java.lang.Long
????* short and java.lang.Short
????* java.lang.String
????* java.sql.Date
????* java.sql.Time
????* java.sql.Timestamp

這里要注意一點，java.util.Date是不被支持的，而它的子類java.sql.Date是被支持的。因此如果對象包含時間類型的屬性，且希望被轉換的時候，一定要使用java.sql.Date類型。否則在轉換時會提示argument mistype異常。 解決方法一：如果變為java.sql.Date這樣用BeanUtils用可以和String進行copy property了. Address1 addr3=new?Address1(); ?????? System.out.println(StringUtils.center("test", 56,"-")); ?????? addr2.setDate(Date.valueOf("2007-5-9")); //???? PropertyUtils.copyProperties(addr2, addr3); ?????? BeanUtils.copyProperties(addr3, addr2); ?????? System.out.println(addr3.getDate()); 解決方法二：自定義Converter的方法：Defining Your Own Converters The?ConvertUtils?class supports the ability to define and register your own String --> Object conversions for any given Java class. Once registered, such converters will be used transparently by all of the?BeanUtilsmethods (including?populate()). To create and register your own converter, follow these steps:

• Write a class that implements the?Converter?interface. The?convert()?method should accept thejava.lang.Class?object of your application class (i.e. the class that you want to convert to, and a String representing the incoming value to be converted.
• At application startup time, register an instance of your converter class by calling theConvertUtils.register()?method.

代碼如下： import?java.text.ParseException; import?java.text.SimpleDateFormat; import?org.apache.commons.beanutils.Converter; publicclass?CustomerDateConverter?implements?Converter { ????privatefinalstatic?SimpleDateFormat?DATE_FORMATE_SHOW?=?new?SimpleDateFormat("yyyy-MM-dd"); ????public?Object?convert(Class type, Object value){ ???????//?TODO?Auto-generated method stub ???????if?(type.equals(java.util.Date.class) ) { ??????????????try?{ ??????????????????returnDATE_FORMATE_SHOW.parse(value.toString()); ????????????? }?catch?(ParseException e) { ??????????????????//?TODO?Auto-generated catch block ????????????????? e.printStackTrace(); ????????????? } ?????? } ???????returnnull; ??? } } public java.lang.Object?convert(java.lang.Class?type, ??????????????????????????????? java.lang.Object?value) Convert the specified input object into an output object of the specified type. Parameters: type?- Data type to which this value should be converted (要轉換的類型) value?- The input value to be converted ??(輸入的值) Returns: The converted value 測試代碼: ?????? System.out.println(StringUtils.center("test", 56,"-")); Address1 addr1=new?Address1();?//Address1中的date是String Address2 addr2=new?Address2();?//Address1中的date是java.util.Date ??? ??? Addr1.setDate("2007-2-6"); ?????? ? ?????? ?CustomerDateConverter dateConverter =?new?CustomerDateConverter ();? ?????? ?ConvertUtils.register(dateConverter,Date.class);?? //上面兩句是關鍵！ ?????? ?????? ?BeanUtils.copyProperties(addr2, addr1); ?????? ?System. out .println(addr2.getDate().toLocaleString()); ?

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