Spring入门hello world

下载spring框架

http://www.springsource.org/spring-community-download

另外，不知道为什么，这里没有commons logging这个jar包，要在下面的链接中下载，是下载···bin.zip文件

http://commons.apache.org/proper/commons-logging/download_logging.cgi

打开eclipse，新建一个“java Project” 然后，点击新建的项目，右键-Properties-java Builder Path,在libraries中找到“Add Library”-user library-User libraries,新建一个User Library，名为“spring3.2.2”将lib中的几个jar包都导入进去，在把commons-logging的jar包也一起导进去

当然，也可以把用到的几个jar包导入进去

接下来编写第一个组件（component），他只是一个简单的JavaBean。

package onlyfun.caterpillar;

public class HelloBean {
private String helloWorld;

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

public String getHelloWorld(){
return this.helloWorld;
}
}

接下来，在src目录中新建一个beans-config.xml配置文件，当然，名字可以自己另外命名。

<?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-3.2.xsd">
<bean id="helloBean"
class="onlyfun.caterpillar.HelloBean">
<property name="helloWorld">
<value>Hello!riseaocean!</value>
</property>
</bean>
</beans>

最后，编写一个示范程序来运行

package onlyfun.caterpillar;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

public class SpringDemo {
@SuppressWarnings({ "deprecation", "resource" })
public static void main(String []args){
Resource rs = new ClassPathResource("beans-config.xml");
BeanFactory factory = new XmlBeanFactory(rs);

HelloBean hello = (HelloBean)factory.getBean("helloBean");
System.out.println(hello.getHelloWorld());
}
}

当然，由于提示The type XmlBeanFactory is deprecated，可以把程序改为：

package onlyfun.caterpillar;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringDemo {
@SuppressWarnings({ "resource" })
public static void main(String []args){
ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"beans-config.xml"});
BeanFactory factory = context;
HelloBean helloBean = (HelloBean)factory.getBean("helloBean");
System.out.println(helloBean.getHelloWorld());
}
}

程序运行结果：

Hello!riseaocean!