Spring中配置方式

public class ExampleBean implements InitializingBean {
   @Overwrite	
   public void afterPropertiesSet() {
      // do some initialization work
   }
}

<bean id="exampleBean" 
         class="examples.ExampleBean" init-method="init"/>
         
//在类中定义一下方法
public class ExampleBean {
    public void init() {}
}

public class ExampleBean implements DisposableBean {
   @Overwrite
   public void destroy() {
      // do some destruction work
   }
}

<bean id="exampleBean"
         class="examples.ExampleBean" destroy-method="destroy"/>
         
public class ExampleBean {
   public void destroy() {
      // do some destruction work
   }
}

/*HelloWorld.java*/
public class HelloWorld {
   private String message;
   public void setMessage(String message){
      this.message  = message;
   }
   public void getMessage(){
      System.out.println("Your Message : " + message);
   }
   public void init(){
      System.out.println("Bean is going through init.");
   }
   public void destroy(){
      System.out.println("Bean will destroy now.");
   }
}
/*InitHelloWorld.java*/
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.BeansException;
public class InitHelloWorld implements BeanPostProcessor {
   public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
      System.out.println("BeforeInitialization : " + beanName);
      return bean;  // you can return any other object as well
   }
   public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
      System.out.println("AfterInitialization : " + beanName);
      return bean;  // you can return any other object as well
   }
}
/*MainApp.java*/
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
   public static void main(String[] args) {
      AbstractApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
      HelloWorld obj = (HelloWorld) context.getBean("helloWorld");
      obj.getMessage();
      context.registerShutdownHook();//关闭hook，确保bean被销毁
   }
}

/*Beans.xml*/
<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

   <bean id="helloWorld" class="com.tutorialspoint.HelloWorld"
       init-method="init" destroy-method="destroy">
       <property name="message" value="Hello World!"/>
   </bean>

   <bean class="com.tutorialspoint.InitHelloWorld" order="..可以用来定义执行前后的顺序..."/>

</beans>

public class TextEditor {
   private SpellChecker spellChecker;
   private String name;
   public TextEditor( SpellChecker spellChecker, String name ) {
      this.spellChecker = spellChecker;
      this.name = name;
   }
   public SpellChecker getSpellChecker() {
      return spellChecker;
   }
   public String getName() {
      return name;
   }
   public void spellCheck() {
      spellChecker.checkSpelling();
   }
}

public class Foo {
   public Foo(Bar bar, Baz baz) {
      // ...
   }
}

import org.springframework.beans.factory.annotation.Required;
public class Student {
    private Integer age;
    
    @Required
    public void setAge(Integer age) {
        this.age = age;
    }
    public Integer getAge() {
        return age;
    }
}

//Profile.java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
public class Profile {
   @Autowired
   @Qualifier("student1")//指定注入id为student1的bean
   private Student student;
   public Profile(){
      System.out.println("Inside Profile constructor." );
   }
   public void printAge() {
      System.out.println("Age : " + student.getAge() );
   }
   public void printName() {
      System.out.println("Name : " + student.getName() );
   }
}

//MainApp.java
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
   public static void main(String[] args) {
      ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
      Profile profile = (Profile) context.getBean("profile");
      profile.printAge();
      profile.printName();
   }
}

import org.springframework.context.annotation.*;
@Configuration
public class HelloWorldConfig {
   @Bean 
   public HelloWorld helloWorld(){
      return new HelloWorld();
   }
}

//以上代码等同于如下的xml配置
<beans>
   <bean id="helloWorld" class="com.tutorialspoint.HelloWorld" />
</beans>

//mainApp.java
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.*;

public class MainApp {
   public static void main(String[] args) {
      ApplicationContext ctx = 
      new AnnotationConfigApplicationContext(HelloWorldConfig.class);
	 /*也可以通过如下方式加载多个配置文件
	  ApplicationContext ctx = new AnnotationConfigApplicationContext();
	  ctx.register(AppConfig.class, OtherConfig.class);
   	  ctx.register(AdditionalConfig.class);
   	  ctx.refresh();
	 */	
      HelloWorld helloWorld = ctx.getBean(HelloWorld.class);

      helloWorld.setMessage("Hello World!");
      helloWorld.getMessage();
   }
}

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Around;
@Aspect
public class Logging2 {
    /** Following is the definition for a pointcut to select
     *  all the methods available. So advice will be called
     *  for all the methods.
     */
    @Pointcut("execution(* main.java.com.lqb.demo1.aop.*(..))")
    private void selectAll(){}
    /**
     * This is the method which I would like to execute
     * before a selected method execution.
     */
    @Before("selectAll()")
    public void beforeAdvice(){
        System.out.println("Going to setup student profile.");
    }
    /**
     * This is the method which I would like to execute
     * after a selected method execution.
     */
    @After("selectAll()")
    public void afterAdvice(){
        System.out.println("Student profile has been setup.");
    }
    /**
     * This is the method which I would like to execute
     * when any method returns.
     */
    @AfterReturning(pointcut = "selectAll()", returning="retVal")
    public void afterReturningAdvice(Object retVal){
        System.out.println("Returning:" + retVal.toString() );
    }
    /**
     * This is the method which I would like to execute
     * if there is an exception raised by any method.
     */
    @AfterThrowing(pointcut = "selectAll()", throwing = "ex")
    public void AfterThrowingAdvice(IllegalArgumentException ex){
        System.out.println("There has been an exception: " + ex.toString());
    }
}