本文谈spring的helloworld,在谈spring的helloworld之前,我们先写一个程序。
public class Test {
public static void main(String[] args) {
HelloWorld helloWorld = new HelloWorld();
helloWorld.setName("haha");
helloWorld.hello();
}
}
public class HelloWorld {
private String name;
public void setName(String name) {
this.name = name;
}
public void hello(){
System.out.println("hello,"+name);
}
}
这个程序是传统的写法,我们要用helloworld的方法就要先new一个对象。
现在,用spring来写,不需要new,先看示例。
1、先导包,spring需要的包如下图:
2、编写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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="helloworld" class="bean.HelloWorld">
<property name="name" value="xixi"></property>
</bean>
</beans>
3、使用
public class Test {
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
HelloWorld helloWorld = (HelloWorld) ac.getBean("helloworld");
helloWorld.hello();
}
}
该示例演示了spring的helloworld,通过配置文件将name注入,程序输出hello,xixi