Spring+Maven——HelloWorld

Spring+Maven——HelloWorld

开始Spring的学习，在学习开始之间，首先介绍一下目前我了解的Spring。spring是用来创建类的。以往我们程序中的对象都是通过new的方式进行创建的。后来，人们发现类和类之间的耦合太强了，所以改用工厂模式。在后来把工厂模式和其他模式一起整个到框架中，从而形成了spring中IOC和DI的部分。其他的部分目前还没有了解，希望以后了解之后，再和大家介绍。下面是一个例子程序，使用的是Maven进行项目构建，当然构建的是一个普通的java程序。本文参考书籍《轻量级javaEE》

<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.xueyoucto.xueyou</groupId>
<artifactId>Spring-helloworld</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<name>Spring-helloworld</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jms -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jms</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc-portlet -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc-portlet</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-messaging -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-messaging</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-instrument -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-instrument</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-framework-bom -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-framework-bom</artifactId>
<version>4.0.5.RELEASE</version>
<type>pom</type>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.0.5.RELEASE</version>
</dependency>
</dependencies>
</project>

package com.xueyoucto.xueyou;

/**
* Created by Administrator on 2016/7/10.
*/
public interface Axe {
public String chop();
}

package com.xueyoucto.xueyou;

/**
* Created by Administrator on 2016/7/10.
*/
public interface Person {
public void useAxe();
}

package com.xueyoucto.xueyou;

/**
* Created by Administrator on 2016/7/10.
*/
public class Chinese  implements Person{
private  Axe axe;

public void setAxe(Axe axe) {
this.axe = axe;
}

@Override
public void useAxe() {
System.out.println(axe.chop());
}
}

package com.xueyoucto.xueyou;

/**
* Created by Administrator on 2016/7/10.
*/
public class StoneAxe implements Axe{
@Override
public String chop() {
return "石斧砍柴好慢";
}
}

package com.xueyoucto.xueyou;

/**
* Created by Administrator on 2016/7/10.
*/
public class StealAxe implements Axe{
@Override
public String chop() {
return "铁斧砍柴好快";
}
}

package com.xueyoucto.xueyou;

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

/**
* Hello world!
*/
public class App {
public static void main(String[] args) {
System.out.println("Hello World!");
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
Person p = ctx.getBean("chinese",Person.class);
p.useAxe();
}
}

<?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="chinese" class="com.xueyoucto.xueyou.Chinese">
<property name="axe" ref="stoneAxe"></property>
</bean>
<bean id="stoneAxe" class="com.xueyoucto.xueyou.StoneAxe">
</bean>
<bean id="stealAxe" class="com.xueyoucto.xueyou.StealAxe"></bean>
</beans>

运行结果：



这样做的好处就是，如果程序想用stealAxe直接在XML中进行配置即可，不用再对类进行重新的编译。

<?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="chinese" class="com.xueyoucto.xueyou.Chinese">
<property name="axe" ref="stealAxe"></property>
</bean>
<bean id="stoneAxe" class="com.xueyoucto.xueyou.StoneAxe">
</bean>
<bean id="stealAxe" class="com.xueyoucto.xueyou.StealAxe"></bean>
</beans>

运行结果：