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");