Apache Commons包 BeanUtils 對(duì)象拷貝實(shí)例demo

發(fā)布時(shí)間：2019-05-08作者：laosun閱讀(1846)

Apache Commons包 BeanUtils 對(duì)象拷貝實(shí)例demo

Apache Commons 工具類(lèi)大家都有用過(guò)，但是可能缺乏系統(tǒng)學(xué)習(xí)，只用到了一小部分功能，無(wú)法發(fā)揮極限的價(jià)值。

Person.java/**?*?新創(chuàng)建一個(gè)普通Java?Bean，用來(lái)作為被克隆的對(duì)象?*?注意：使用內(nèi)部類(lèi)是不可以的?*?@author?sun?*/public?class?Person?{private?String?name;private?String?email;private?Integer?age;public?Person()?{}public?Person(String?name,?String?email,?Integer?age)?{super();this.name?=?name;this.email?=?email;this.age?=?age;}public?String?getName()?{return?name;}public?void?setName(String?name)?{this.name?=?name;}public?String?getEmail()?{return?email;}public?void?setEmail(String?email)?{this.email?=?email;}public?Integer?getAge()?{return?age;}public?void?setAge(Integer?age)?{this.age?=?age;}public?String?toString()?{return?"Person[name='"?+?name?+?"',email='"?+?email?+?"',age='"?+?age?+?"']";}}

BeanUtilsTest.javaimport?java.lang.reflect.InvocationTargetException;import?java.util.HashMap;import?java.util.Map;import?org.apache.commons.beanutils.BeanUtils;/**?*?深克隆?*?@author?sun?*/public?class?BeanUtilsTest?{public?static?void?main(String[]?args)?{deepBeanClone();convertPojoMap();}/**?*?1.?對(duì)象轉(zhuǎn)map?*?2.?map轉(zhuǎn)對(duì)象?*/private?static?void?convertPojoMap()?{try?{//?原理也是通過(guò)Java的反射機(jī)制來(lái)做的。//?2、?將一個(gè)Map對(duì)象轉(zhuǎn)化為一個(gè)Bean//?這個(gè)Map對(duì)象的key必須與Bean的屬性相對(duì)應(yīng)。Map?map?=?new?HashMap<>();map.put("name",?"tom");map.put("email",?"tom@");map.put("age",?"21");//?將map轉(zhuǎn)化為一個(gè)Person對(duì)象Person?person?=?new?Person();BeanUtils.populate(person,?map);System.out.println("map轉(zhuǎn)對(duì)象："+person.getName()+"?>>?"+person.getAge());//?通過(guò)上面的一行代碼，此時(shí)person的屬性就已經(jīng)具有了上面所賦的值了。//?將一個(gè)Bean轉(zhuǎn)化為一個(gè)Map對(duì)象了，如下：@SuppressWarnings({?"unchecked"?})Map?map2?=?BeanUtils.describe(person);System.out.println("對(duì)象轉(zhuǎn)map："+map2.get("name")+"?>>?"+map2.get("age"));}?catch?(IllegalAccessException?e)?{e.printStackTrace();}?catch?(InvocationTargetException?e)?{e.printStackTrace();}?catch?(NoSuchMethodException?e)?{e.printStackTrace();}}/**?*?測(cè)試對(duì)象深克隆?*/private?static?void?deepBeanClone()?{Person?person?=?new?Person();person.setName("java");person.setEmail("java@java.com");person.setAge(28);try?{//?克隆(深度克隆)Person?person2?=?(Person)?BeanUtils.cloneBean(person);person2.setAge(29);System.out.println("克隆產(chǎn)生新對(duì)象并且更新："+person2.getName()?+?"?>>?"?+?person2.getAge());System.out.println("原對(duì)象："+person.getName()?+?"?>>?"?+?person.getAge());}?catch?(IllegalAccessException?e)?{e.printStackTrace();}?catch?(InstantiationException?e)?{e.printStackTrace();}?catch?(InvocationTargetException?e)?{e.printStackTrace();}?catch?(NoSuchMethodException?e)?{e.printStackTrace();}}}

控制臺(tái)打印：克隆產(chǎn)生新對(duì)象并且更新：java?>>?29原對(duì)象：java?>>?28map轉(zhuǎn)對(duì)象：tom?>>?21對(duì)象轉(zhuǎn)map：tom?>>?21

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