目录：

spring（23种设计模式环境）

ClassA.java

package cn.itcast.domain;

public class ClassA {
    public String say() {
        return "Hello World!";
    }
}

applicationContext.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" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
    <bean id="classA" class="cn.itcast.domain.ClassA" />
</beans>

ClassTest.java

package cn.itcast.dao.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.itcast.domain.ClassA;

public class ClassTest {
    @Test
    public void test() {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        ClassA classA = (ClassA) ctx.getBean("classA");
        classA.say();
    }
}

测试结果：

spring（23种设计模式环境）