3.spring进阶运用

1.配置Bean的属性和依赖关系

注入集合值：使用<list> <map> <set> <props>分别表示List、Map、Set或者Properties对象

<bean id="InjectCollections" class="com.deciphering.InjectCollections.InjectCollections">  <property name="sets">  <set>  <value>1</value>  <value>2</value>  </set>  </property>  <property name="lists">  <list>  <value>1</value>  <value>2</value>  <value>3</value>  </list>  </property>  <property name="maps">  <map>  <entry key="1" value="1"></entry>  <entry key="2" value="2"></entry>  <entry key="3" value="3"></entry>  <entry key="4" value="4"></entry>  </map>  </property>  </bean>

2.管理Bean的生命周期

Spring容器中Bean的作用域：

• Singleton
• Prototype
• Request
• Session
• Global session

Spring提供两种方法在Bean全部属性设置成功后执行指定行为：

• 使用init-method
• 实现initializingBean接口

Spring提供两种方法在Bean实例销毁之前执行指定行为：

• 使用destory-method属性
• 实现DisposableBean接口

使用方法注入-协调作用域不同的Bean（singleton依赖prototype）

  <bean id="helper" class="com.deciphering.bean.MyHelper" scope="prototype">  </bean>     <bean id="abstractLookupBean" class="com.deciphering.bean.AbstractLookupDemo">  <lookup-method name="getMyHelper" bean="helper"/>  </bean>  <bean id="standardLookupBean" class="com.deciphering.bean.StandardLookupDemo">  <property name="myHelper" ref="helper"/>  </bean>

public class StandardLookupDemo implements DemoBean {private MyHelper myHelper;public MyHelper getMyHelper() {return myHelper;}public void setMyHelper(MyHelper myHelper) {this.myHelper = myHelper;}@Overridepublic MyHelper getHelper() {// TODO Auto-generated method stubreturn this.myHelper;}@Overridepublic void someOperation() {// TODO Auto-generated method stubmyHelper.doSomethingHelpful();}}

public abstract class AbstractLookupDemo implements DemoBean {public abstract MyHelper getMyHelper();<span style="white-space:pre"></span>//spring框架负责实现@Overridepublic MyHelper getHelper(){return getMyHelper();}@Overridepublic void someOperation() {// TODO Auto-generated method stubgetMyHelper().doSomethingHelpful();}}

让Bean可以感知Spring容器

• 使用BeanNameAware接口
• 使用BeanFactoryAware接口、ApplicationContextAware接口

Spring的国际化支持：

 <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"><property name="basenames" ><list><value>message</value><!--如果有多个资源文件，全部列举在此--></list></property>  </bean> 

//实例化ApplicationContextApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");String [] a = {"读者"};//使用getMessage方法获得本地化信息。//返回计算机环境默认的LocaleString hello = ctx.getMessage("hello", a, Locale.getDefault());Object[] b = { new Date() };String now = ctx.getMessage("now", b, Locale.getDefault());//将两条本地化信息打印出来System.out.println(hello);System.out.println(now);//认为设置成英文环境hello = ctx.getMessage("hello", a, Locale.US);now = ctx.getMessage("now", b, Locale.US);//将两条英文信息打印出来System.out.println(hello);System.out.println(now);//认为设置成中文环境hello = ctx.getMessage("hello", a, Locale.CHINA);now = ctx.getMessage("now", b, Locale.CHINA);//将两条中文信息打印出来System.out.println(hello);System.out.println(now);