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

《Jakarta Commons cookbook读书笔记》系列文章

 

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》系列文章