Jakarta Commons Cookbook读书笔记--Commons BeanUtils(2)

Jakarta Commons Cookbook读书笔记--Commons BeanUtils(2)

Jakarta Commons Cookbook读书笔记系列

2.2 org.apache.commons.beanutils.BeanComparator比较Bean属性
排序前
Book book
|--List authors
          |--[0]->Person person1
                          |--String name->"LiLei"
          |--[1]->Person person2
                          |--String name->"Ark"
          |--[2]->Person person3
                          |--String name->"HanMeimei"
                         

Comparator nameComparor = new  BeanComparator( " name " );
Collections.sort(book.getAuthors(),nameComparor);

排序后
Book book
|--List authors
          |--[0]->Person person1
                          |--String name->"Ark"
          |--[1]->Person person2
                          |--String name->"HanMeimei"
          |--[2]->Person person3
                          |--String name->"LiLei"

2.3 org.apache.commons.beanutils.collections.BeanMap 使用Map封装Bean
封装属性

Person person = new  Person();
person.setName( " Heis " );
person.setAge( 50 );
Map beanMap = new  BeanMap(person);

Map beanMap
       |-- Entry(key -> " name " ,value -> " Heis " )
       |-- Entry(key -> " age " ,value -> Integer( 50 ))

     
getReadMethod(),getWriteMethod()取读方法与写方法

BeanMap beanMap = new  BeanMap(person);
Method wMethod = beanMap.getWriteMethod( " age " );
wMethod.invoke(person, new  Integer( 24 ));
Method rMethod = beanMap.getReadMethod( " age " );
rMethod.invoke(person); -> 24

2.4 使用org.apache.commons.beanutils.DynaBean接口，可以在运行时创建动态Bean，而且创建的动态bean可以与BeanUtils包内的工具（如PropertyUtils等）结合使用。

DynaProperty[] beanProperties = new  DynaProperty[]{
new  DynaProperty( " name " ,String. class ),
new  DynaProperty( " age " ,Integer. class )};
// BasicDynaBean implements DynaBean
BasicDynaClass personClass = new  BasicDynaClass( " person " ,BasicDynaBean. class ,beanProperties);
DynaBean person = BasicDynaClass.newInstance();
// set the properties
person.set( " name " , " Heis " );
PropertyUtils.setProperty(person, " age " , new  Integer( 50 ));

2.5 使用BeanUtils以字符串形式访问属性

String ageStr = BeanUtils.getProperty(person, " age " );
BeanUtils.setProperty(person, " age " , " 50 " );

Jakarta Commons Cookbook读书笔记系列



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