Spring的学习(IoC，AOP)等

下面这个系列是非常好的例子：

http://www.yiibai.com/spring/spring-3-hello-world-example.html

正在看，把一些基础夯实。

IoC可以从下面一篇开始看（前面几篇的bean配置也需要看，是基础）：

http://www.yiibai.com/spring/spring-dependency-injection-di.html

AOP可以从下面一篇开始看：

http://www.yiibai.com/spring/spring-aop-examples-advice.html

开始写代码实验各种效果：

实验1（简单利用ApplicationContext）http://www.yiibai.com/spring/spring-3-hello-world-example.html:

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.myapp</groupId>

    <artifactId>springdemo</artifactId>

    <version>1.0-SNAPSHOT</version>

    <dependencies>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-core</artifactId>

            <version>4.3.2.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>4.3.2.RELEASE</version>

        </dependency>

    </dependencies>

</project>

resources里面方applicationContext.xml

<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="helloBean" class="com.myapp.springdemo.Hello">

        <property name="name" value="Here"/>

    </bean>

</beans>

src/main/java里面建package：com.myapp.springdemo，然后有两个class，分别是

Hello.java

package com.myapp.springdemo;

/**

 * Created by baidu on 16/10/20.

 */

public class Hello {

    private String name;

    public void setName(String name) {

        this.name = name;

    }

    public void printHello() {

        System.out.printf("Hello is %s\n", name);

    }

}

SpringDemo.java

package com.myapp.springdemo;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

 * Created by baidu on 16/10/20.

 */

public class SpringDemo {

    public static void main(String[] args) {

        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        Hello obj = (Hello) context.getBean("helloBean");

        obj.printHello();

    }

}

然后运行，成功：

十月 20, 2016 2:27:20 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 14:27:20 CST 2016]; root of context hierarchy

十月 20, 2016 2:27:20 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

Hello is Here

Process finished with exit code 0

实验2（松耦合，通过xml配置class之间的依赖关系）http://www.yiibai.com/spring/spring-loosely-coupled-example.html

pom.xml不变。

resources/applicationContext.xml

<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="helloBean" class="com.myapp.springdemo.Hello">

        <property name="outputGenerator" ref="CsvOutputGenerator"/>

    </bean>

    <bean id="CsvOutputGenerator" class="com.myapp.springdemo.CsvOutputGenerator"/>

</beans>

还有另一种写法，把property的ref单独提出来：

<bean id="helloBean" class="com.myapp.springdemo.Hello">

        <property name="outputGenerator">

            <ref local="CsvOutputGenerator"/>

        </property>

    </bean>

上面的local也可以写成bean。
其实，无论是在相同或不同的XML文件，“ref” 标签可以访问一个bean，但是，对于该项目的可读性，如果引用了相同的 XML文件中声明 bean，您应该使用“local”属性。

SpringDemo.java

package com.myapp.springdemo;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

 * Created by baidu on 16/10/20.

 */

public class SpringDemo {

    public static void main(String[] args) {

        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        Hello obj = (Hello) context.getBean("helloBean");

        obj.printHello();

    }

}

Hello.java

package com.myapp.springdemo;

/**

 * Created by baidu on 16/10/20.

 */

public class Hello {

    private IOutputGenerator outputGenerator;

    public void setOutputGenerator(IOutputGenerator outputGenerator) {

        this.outputGenerator = outputGenerator;

    }

    public void printHello() {

        this.outputGenerator.print();

    }

}

IOutputGenerator.java

package com.myapp.springdemo;

/**

 * Created by baidu on 16/10/20.

 */

public interface IOutputGenerator {

    public void print();

}

CsvOutputGenerator.java

package com.myapp.springdemo;

/**

 * Created by baidu on 16/10/20.

 */

public class CsvOutputGenerator implements IOutputGenerator{

    public void print() {

        System.out.printf("Here is csv output\n");

    }

}

运行，成功。

十月 20, 2016 2:42:20 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 14:42:20 CST 2016]; root of context hierarchy

十月 20, 2016 2:42:21 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

Here is csv output

Process finished with exit code 0

下面，再试一下AOP的内容：

在Spring AOP中，有 4 种类型通知(advices)的支持：

通知(Advice)之前 - 该方法执行前运行

通知(Advice)返回之后 – 运行后，该方法返回一个结果

通知(Advice)抛出之后 – 运行方法抛出异常后，

环绕通知 – 环绕方法执行运行，结合以上这三个通知。

实验1（在方法前执行）http://www.yiibai.com/spring/spring-aop-examples-advice.html：

增加一个 HijackMethod.java，注意是要实现MethodBeforeAdvice接口的方法：

package com.myapp.springdemo;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

/**

 * Created by baidu on 16/10/20.

 */

public class HijackMethod implements MethodBeforeAdvice{

    public void before(Method method, Object[] objects, Object o) throws Throwable {

        System.out.println("HijackBeforeMethod");

    }

}

其他的文件，为了实验需要，稍作修改。

CsvOutputGenerator.java

package com.myapp.springdemo;

/**

 * Created by baidu on 16/10/20.

 */

public class CsvOutputGenerator implements IOutputGenerator{

    public void printHello() {

        System.out.printf("Here is csv output\n");

    }

    public void printBye() {

        System.out.printf("Byebye in csv output\n");

    }

}

Hello.java

package com.myapp.springdemo;

/**

 * Created by baidu on 16/10/20.

 */

public class Hello {

    private IOutputGenerator outputGenerator;

    public void setOutputGenerator(IOutputGenerator outputGenerator) {

        this.outputGenerator = outputGenerator;

    }

    public void print() {

        System.out.println("*************************");

        this.outputGenerator.printHello();

        System.out.println("*************************");

        this.outputGenerator.printBye();

        System.out.println("*************************");

    }

}

IOutputGenerator.java

package com.myapp.springdemo;

/**

 * Created by baidu on 16/10/20.

 */

public interface IOutputGenerator {

    public void printHello();

    public void printBye();

}

在applicationContext.xml里面需要进行配置：

<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="helloBean" class="com.myapp.springdemo.Hello">

        <property name="outputGenerator">

            <ref local="CsvOutputGenerator"/>

        </property>

    </bean>

    <bean id="hijackMethodBean" class="com.myapp.springdemo.HijackMethod"/>

    <bean id="helloProxyBean" class="org.springframework.aop.framework.ProxyFactoryBean">

        <property name="target" ref="helloBean"/>

        <property name="interceptorNames">

            <list>

                <value>hijackMethodBean</value>

            </list>

        </property>

    </bean>

    <bean id="CsvOutputGenerator" class="com.myapp.springdemo.CsvOutputGenerator"/>

</beans>

然后主文件的调用部分修改成调用Proxy：

package com.myapp.springdemo;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

 * Created by baidu on 16/10/20.

 */

public class SpringDemo {

    public static void main(String[] args) {

        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        //Hello obj = (Hello) context.getBean("helloBean");

        Hello obj = (Hello) context.getBean("helloProxyBean");

        obj.print();

    }

}

运行，得到结果：

十月 20, 2016 3:11:11 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 15:11:11 CST 2016]; root of context hierarchy

十月 20, 2016 3:11:11 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

HijackBeforeMethod

*************************

Here is csv output

*************************

Byebye in csv output

*************************

Process finished with exit code 0

这时候，发现"HijackBeforeMethod"打印在了"***"前面。这时候发现，我们的AoP是做在了Hello这个class，所以是在Hello的方法print之前进行了Advice的调用。修改一下xml配置：

<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="helloBean" class="com.myapp.springdemo.Hello">

        <property name="outputGenerator">

            <ref local="outputProxyBean"/>

        </property>

    </bean>

    <bean id="hijackMethodBean" class="com.myapp.springdemo.HijackMethod"/>

    <bean id="outputProxyBean" class="org.springframework.aop.framework.ProxyFactoryBean">

        <property name="target" ref="CsvOutputGenerator"/>

        <property name="interceptorNames">

            <list>

                <value>hijackMethodBean</value>

            </list>

        </property>

    </bean>

    <bean id="CsvOutputGenerator" class="com.myapp.springdemo.CsvOutputGenerator"/>

</beans>

然后在主函数里面把调用改回原来的class：

package com.myapp.springdemo;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**

 * Created by baidu on 16/10/20.

 */

public class SpringDemo {

    public static void main(String[] args) {

        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        //Hello obj = (Hello) context.getBean("helloBean");

        Hello obj = (Hello) context.getBean("helloBean");

        obj.print();

    }

}

运行，得到结果：

十月 20, 2016 3:19:34 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 15:19:34 CST 2016]; root of context hierarchy

十月 20, 2016 3:19:34 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

*************************

HijackBeforeMethod

Here is csv output

*************************

HijackBeforeMethod

Byebye in csv output

*************************

Process finished with exit code 0

实验2，环绕AOP，包括了前、后、异常的处理，http://www.yiibai.com/spring/spring-aop-examples-advice.html 最后一部分。

增加一个 HijackAroundMethod.java，需要实现 MethodInterceptor接口的方法，而不是之前的MethodBeforeAdvice接口的方法：

package com.myapp.springdemo;

import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

import java.util.Arrays;

import java.util.IllegalFormatCodePointException;

/**

 * Created by baidu on 16/10/20.

 */

public class HijackAroundMethod implements MethodInterceptor{

    public Object invoke(MethodInvocation methodInvocation) throws Throwable {

        System.out.println("Method name: " + methodInvocation.getMethod().getName());

        System.out.println("Method args: " + Arrays.toString(methodInvocation.getArguments()));

        System.out.println("Before Method");

        try {

            Object result = methodInvocation.proceed();

            System.out.println("After Method");

            return result;

        } catch (IllegalArgumentException e) {

            System.out.println("Catch Exception for Method");

            throw e;

        }

    }

}

然后其他的java代码都不用变，只需要修改applicationContext.xml配置文件里面关于拦截器Interceptor的bean映射class的内容，只需要改一行：

<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="helloBean" class="com.myapp.springdemo.Hello">

        <property name="outputGenerator">

            <ref local="outputProxyBean"/>

        </property>

    </bean>

    <bean id="hijackMethodBean" class="com.myapp.springdemo.HijackAroundMethod"/>

    <bean id="outputProxyBean" class="org.springframework.aop.framework.ProxyFactoryBean">

        <property name="target" ref="CsvOutputGenerator"/>

        <property name="interceptorNames">

            <list>

                <value>hijackMethodBean</value>

            </list>

        </property>

    </bean>

    <bean id="CsvOutputGenerator" class="com.myapp.springdemo.CsvOutputGenerator"/>

</beans>

只需要修改上面飘红的那一行。然后运行，得到：

十月 20, 2016 3:29:10 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 15:29:10 CST 2016]; root of context hierarchy

十月 20, 2016 3:29:10 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

*************************

Method name: printHello

Method args: []

Before Method

Here is csv output

After Method

*************************

Method name: printBye

Method args: []

Before Method

Byebye in csv output

After Method

*************************

Process finished with exit code 0

实验3，只对部分函数进行拦截，http://www.yiibai.com/spring/spring-aop-example-pointcut-advisor.html 后面一部分：

修改xml配置，要用到"org.springframework.aop.support.NameMatchMethodYiibaicut"（新版已经改成NameMatchMethodPointcut）

在Spring AOP中，有三个非常专业术语- Advices, Yiibaicut , Advisor，把它在非官方的方式...

Advice – 指示之前或方法执行后采取的行动。

Yiibaicut – 指明哪些方法应该拦截，通过方法的名称或正则表达式模式。

Advisor – 分组"通知"和”切入点“成为一个单元，并把它传递到代理工厂对象。

要对部分函数进行拦截，就要用到上面的概念。只需要修改xml配置文件即可，不需要改代码：

applicationContext.xml

<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="helloBean" class="com.myapp.springdemo.Hello">

        <property name="outputGenerator">

            <ref local="outputProxyBean"/>

        </property>

    </bean>

    <bean id="hijackMethodBean" class="com.myapp.springdemo.HijackAroundMethod"/>

    <bean id="customerYiibaicut" class="org.springframework.aop.support.NameMatchMethodPointcut">

        <property name="mappedName" value="printBye"/>

    </bean>

    <bean id="outputAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor">

        <property name="pointcut" ref="customerYiibaicut"/>

        <property name="advice" ref="hijackMethodBean"/>

    </bean>

    <bean id="outputProxyBean" class="org.springframework.aop.framework.ProxyFactoryBean">

        <property name="target" ref="CsvOutputGenerator"/>

        <property name="interceptorNames">

            <list>

                <value>outputAdvisor</value>

            </list>

        </property>

    </bean>

    <bean id="CsvOutputGenerator" class="com.myapp.springdemo.CsvOutputGenerator"/>

</beans>

在上面的文件中，可以看出，增加了一个"NameMatchMethodPointcut"的bean，再增加一个"DefaultPointcutAdvisor"的bean把这个Pointcut的过滤条件，和之前的advice “hijackMethodBean”关联起来。然后在“ProxyFactoryBean”里面把之前的advice换成这个advisor即可。

运行，得到结果：

十月 20, 2016 3:50:57 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 15:50:57 CST 2016]; root of context hierarchy

十月 20, 2016 3:50:57 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

*************************

Here is csv output

*************************

Method name: printBye

Method args: []

Before Method

Byebye in csv output

After Method

*************************

Process finished with exit code 0

如果要拦截多个方法，xml里面可以这样写：

<bean id="customerYiibaicut" class="org.springframework.aop.support.NameMatchMethodPointcut">

        <property name="mappedNames">

            <list>

                <value>printHello</value>

                <value>printBye</value>

            </list>

        </property>

    </bean>

运行，得到结果：

十月 20, 2016 3:55:54 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 15:55:54 CST 2016]; root of context hierarchy

十月 20, 2016 3:55:54 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

*************************

Method name: printHello

Method args: []

Before Method

Here is csv output

After Method

*************************

Method name: printBye

Method args: []

Before Method

Byebye in csv output

After Method

*************************

Process finished with exit code 0

或者可以用patter匹配的方法(注意，改的是Advisor，而Pointcut可以不用了)：

<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="helloBean" class="com.myapp.springdemo.Hello">

        <property name="outputGenerator">

            <ref local="outputProxyBean"/>

        </property>

    </bean>

    <bean id="hijackMethodBean" class="com.myapp.springdemo.HijackAroundMethod"/>

    <bean id="outputAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">

        <property name="patterns">

            <list>

                <value>.*print.*</value>

            </list>

        </property>

        <property name="advice" ref="hijackMethodBean"/>

    </bean>

    <bean id="outputProxyBean" class="org.springframework.aop.framework.ProxyFactoryBean">

        <property name="target" ref="CsvOutputGenerator"/>

        <property name="interceptorNames">

            <list>

                <value>outputAdvisor</value>

            </list>

        </property>

    </bean>

    <bean id="CsvOutputGenerator" class="com.myapp.springdemo.CsvOutputGenerator"/>

</beans>

在上面文件中，使用pattern advisor的话，原来的"NameMatchPointcut"的bean不用了可以删去；创建一个RegexMethodPointcutAdvisor的bean，里面的property方面不再使用上个例子上的pointcut，而是配上新的property：patterns，注意patterns里面写的".*print.*"前面的.*也一定要加上，不加上的话不能匹配，可能是因为在方法名前面有调用的前缀吧，虽然打印出来的方法名称的确从print开始。运行，得到结果：

十月 20, 2016 4:01:59 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7a07c5b4: startup date [Thu Oct 20 16:01:59 CST 2016]; root of context hierarchy

十月 20, 2016 4:01:59 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

*************************

Method name: printHello

Method args: []

Before Method

Here is csv output

After Method

*************************

Method name: printBye

Method args: []

Before Method

Byebye in csv output

After Method

*************************

Process finished with exit code 0

（下面一小段可以忽略）

再回顾一下之前Pointcut的例子，对一个class里面的部分函数进行AOP，参考网页里面的配置：

<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-2.5.xsd">

    <bean id="customerService" class="com.yiibai.customer.services.CustomerService">

        <property name="name" value="Yiibai" />

        <property name="url" value="http://www.yiibai.com" />

    </bean>

    <bean id="hijackAroundMethodBeanAdvice" class="com.yiibai.aop.HijackAroundMethod" />

    <bean id="customerServiceProxy"

                class="org.springframework.aop.framework.ProxyFactoryBean">

        <property name="target" ref="customerService" />

        <property name="interceptorNames">

            <list>

                <value>customerAdvisor</value>

            </list>

        </property>

    </bean>

    <bean id="customerYiibaicut"

                class="org.springframework.aop.support.NameMatchMethodYiibaicut">

        <property name="mappedName" value="printName" />

    </bean>

    <bean id="customerAdvisor"

                 class="org.springframework.aop.support.DefaultYiibaicutAdvisor">

        <property name="pointcut" ref="customerYiibaicut" />

        <property name="advice" ref="hijackAroundMethodBeanAdvice" />

    </bean>

</beans>

里面还有一些其他的例子，比如Lucence：

http://www.yiibai.com/html/java/

最后，给一下全部目录：

Spring教程

Spring hello world实例

Spring松耦合实例

Spring JavaConfig实例

Spring JavaConfig @Import实例

Spring依赖注入（DI）

Spring使用Setter依赖注入

Spring通过构造方法依赖注入

Spring Bean引用例子

如何注入值到Spring bean属性

Spring bean加载多个配置文件

Spring内部bean实例

Spring Bean作用域实例

Spring集合 (List,Set,Map,Properties) 实例

Spring ListFactoryBean实例

Spring SetFactoryBean实例

Spring MapFactoryBean例子

Spring注入日期到bean属性-CustomDateEditor

Spring PropertyPlaceholderConfigurer实例

Spring bean配置继承

Spring依赖检查

Spring使用@Required注解依赖检查

Spring自定义@Required-style注解

Spring Bean InitializingBean和DisposableBean实例

Spring Bean init-method 和 destroy-method实例

Spring @PostConstruct和@PreDestroy实例

Spring EL hello world实例

Spring EL bean引用实例

Spring EL方法调用实例

Spring EL运算符实例

Spring EL三元运算(if-then-else)实例

Spring EL Lists,Maps实例

Spring EL正则表达式实例

Spring自动扫描组件

Spring过滤器组件自动扫描

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