Spring小记(1)：构建一个Maven的Spring项目

通过maven构建项目是一件很简单的事情，下面我们使用Maven来构建一个Spring的项目
1、首先创建一个maven的简单project，如下

设置组和ArtifactId 设置工程名

2、添加maven的依赖，具体的做法是在pom.xml文件中写入下面的依赖信息

<?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>Group1</groupId>
    <artifactId>artifacId</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!-- Spring Core-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.2.9.RELEASE</version>
        </dependency>

        <!--Spring Context-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.2.9.RELEASE</version>
        </dependency>
        <!--Spring Jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.5.RELEASE</version>
        </dependency>
    </dependencies>
</project>

3、创建一个接口，定义一个未实现的方法，如下

public interface HelloWorld {
    public void sayHello();
}

4、对这个接口进行两个实现,方法如下
(1)SpringHelloWorld

public class SpringHelloWorld implements HelloWorld{
    public void sayHello() {
        System.out.println("Spring Say Hello!");
    }
}

(2)StructsHelloWorld

public class StructsHelloWorld implements HelloWorld{
    public void sayHello() {
        System.out.println("Structs Say Hello!");
    }
}

5、编写代理方法

public class HelloWorldService {
    private HelloWorld helloWorld;

    public HelloWorldService(){

    }

    public HelloWorld getHelloWorld() {
        return helloWorld;
    }

    public void setHelloWorld(HelloWorld helloWorld) {
        this.helloWorld = helloWorld;
    }
}

6、编写依赖注入的xml文件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.xsd">

    <bean id="springHelloWorld"
          class="com.fan.spring.hello.impl.SpringHelloWorld"/>

    <bean id="structsHelloWorld" class="com.fan.spring.hello.impl.StructsHelloWorld"/>

    <bean id="helloWorldService" class="com.fan.spring.hello.HelloWorldService">
        <property name="helloWorld" ref="structsHelloWorld"></property>
    </bean>
</beans>

7、编写测试方法

public class HelloProgram {

    public static void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        HelloWorldService service = (HelloWorldService) context.getBean("helloWorldService");
        HelloWorld hw = service.getHelloWorld();

        hw.sayHello();
    }
}

8、测试并查看运行的结果，如下

测试结果

这样，一个简单的spring工程就构建完毕了