SSH ALL-IN-ONE

很多新来的同事不了解我们的项目架构准备补充一下我们的项目架构 Spring-Hibernate Based.

主要涉及到一下几个方面

Queue-based event processing

Producer: IDBSync

Consumer: EAI

for producer:

shell, bash, cron job,

for consumer:

hibernate to persistent

spring to glue business and others together, such as transaction,exception,Schedule,Mail,Webservice,apache cxf integration...

Others

Hudson, maven, profile for test,dev,stage,production...

Spring (IOC, DI)

container--factory--bean

<beans>
<bean id="triangle" class="a.b.c.Triangle" />
</beans>

getbean from XmlBeanFactory

BeanFactory factory= new XmlBeanFactory(new FileSystemResource("spring.xml"));
Triangle  triangle = (Triangle)factory.getBean("triangle");

application context

ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Triangle triangle =(Triangle)context.getBean("triangle");

Bean with property

<beans><bean id="triangle" class="a.b.c.Triangle" ><property name="type" value="Equlateral"/></bean>
</beans>

Constructor injection

<beans><bean id="triangle" class="a.b.c.Triangle" ><constructor-arg  type="java.lang.String" index="0" value="Equlateral"/><constructor-arg  index="1" value="20" /></bean>
</beans>

injection object

<beans><bean id="triangle" class="a.b.c.Triangle" ><property name="pointA" ref="aPoint"></bean><bean id="aPoint" class="a.b.c.Point" ><property name="x" value="20"><property name="y" value="120"></bean>
</beans>

inner bean, aliases,idref

<beans><bean id="triangle" class="a.b.c.Triangle"  name="triangle-name"><property name="pointA" ref="aPoint"><property name="pointC">< idref="Point0"/></property><property name="pointB">　　<bean id="point2" class="a.b.c.Point" ><property name="x" value="19"><property name="y" value="12"></bean></property></bean><bean id="aPoint" class="a.b.c.Point" ><property name="x" value="20"><property name="y" value="120"></bean><bean id="Point0" class="a.b.c.Point" ><property name="x" value="0"><property name="y" value="0"></bean>
<alias name="triangle" alias="triangle-alias" />
</beans>

Collections

<beans><bean id="triangle" class="a.b.c.Triangle" ><property name="points" ><list><ref bean="aPoint"><ref bean="bPoint"></list></property></bean><bean id="aPoint" class="a.b.c.Point" ><property name="x" value="20"><property name="y" value="120"></bean><bean id="bPoint" class="a.b.c.Point" ><property name="x" value="120"><property name="y" value="1120"></bean>
</beans>

autowiring=byName,byType,constructor

<beans><bean id="triangle" class="a.b.c.Triangle" autowire="byName"></bean><bean id="aPoint" class="a.b.c.Point" ><property name="x" value="20"><property name="y" value="120"></bean><bean id="bPoint" class="a.b.c.Point" ><property name="x" value="120"><property name="y" value="1120"></bean>
</beans>

Spring Bean Scope

singleton - Only once per Spring container(default)
prototype - new bean created with every request or reference

Web-aware context bean scope

request - new bean per servlet request
session - new bean per session
global session - new bean per global http session(portlet context)

<beans><bean id="bPoint" class="a.b.c.Point" scope="prototype"><property name="x" value="120"><property name="y" value="1120"></bean>
</beans>

Using applicationContextAware

public class Triangle implements ApplicationContextAware, BeanNameAware{private ApplicationContext context=null;@override
public void setApplicationContext(ApplicationContext context)
throws BeansException{this.context = context;
}@override
public void setBeanName(String beanName){System.out.println("bean name is: " +beanName);
}
}

Lifecycle Callbacks

public class Triangle implements InitializingBean, DisposableBean{@Override
public void afterPropertiesSet() throws Exception{
}
@Override
public void destory() throws Exception{
}
public void myInit(){
}
public void myclean(){
}
}

customize init-method and destory-method

<beans><bean id="bPoint" class="a.b.c.Point" init-method="myInit" destory-method="myclean"><property name="x" value="120"><property name="y" value="1120"></bean>
</beans>

BeanPostProcessor

public class XXX implements BeanPostProcessor{@Override
public Object postProcessAfterInitialization(object bean,String beanName) throws BeansException{return bean;
}
@Override
public Object postProcessBeforeInitialization(object bean,String beanName) throws BeansException{return bean;
}
}

Coding to interface

Annotation

Using MessageSource to get text from property files

<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basenames"><list><value>mymessages</value></list>
</property>
</bean>

mymessages.propeties

and in java

ApplicationContext context ;context.getMessage("key",null,"default value");

Event handing

ApplicationEventPublisher.publishEvent() + ApplicationEvent + ApplicationListener

built-in event:

ContextRefreshedEvent
ContextClosedEvent
RequestHandleEvent : web app related, for DispatcherServlet

Load ApplicationContext in web application

ContextLoaderListerner in web.xml

    <context-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/applicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

or ContextLoaderServlet to, but prefer ContextLoaderListener

with Hibernate, Spring as a Container injects all hibernate's dependencies automatically.

SessionFactory+datasource+transactionManager

org.springframework.orm.hibernate3.LocalSessionFactoryBean

org.springframework.orm.hibernate3.HibernateTransactionManager

AOP

import org.aspectj.lang.annotation.Aspect;@Aspect
public class LoggingAspect{@Before("execution(public String getName())")
public void loggingAdvice(){
System.out.println("Advice run, getName method called.");
}
}

config

<beans>
<aop:aspectj-autoproxy />
<bean name=''loggingAspect" class="a.b.c.LoggingAspect"/>
</beans>

or define a pointcut

@Aspect
public class LoggingAspect{@Before("allGetters()")
public void loggingAdvice(){
System.out.println("Advice run, get* method called.");
}@Pointcut("execution(* get*())")
public void allGetters(){}
}

Around pointcut

@Around("allGetters()")
public Object myAroundAdvice(ProceedingJoinPoint joinPoint){
Object returnValue = null;
try{System.out.println("Before advice");returnValue = joinPoint.proceed();System.out.println("After Returning");
}catch(Throwable e){System.out.println("After Throwing");
}
System.out.println("After Finally");
return returnValue;
}

转载于:https://www.cnblogs.com/grep/archive/2012/04/26/2471237.html

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SSH ALL-IN-ONE

Load ApplicationContext in web application

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