spring helloworld

    xiaoxiao2021-12-10  36

    初识spring,自然以helloword开始,spring将对象之间的关系交由spring配置文件管理,因此极大的减弱了对象间的耦合问题,想要say helloworld 当然少不了必要的工具: 1.开发工具; 2.jdk 3.spring-framework 相关jar包 如果上面的都准备好了,那么就开始吧!! 首先:创建HelloMessage接口,创建HelloWorld类,因为我们要说helloword嘛!再写个HelloChina 类,在中国就要说中国话。 第二:创建Person类,让Person来说! 第三:创建helloworld.xml配置文件来规定各类间关系。 第四:main方法读取配置文件,say HelloWorld 是不是很简单? 代码就这些: 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: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-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <bean id="helloWord" class="com.test.HelloWorld"></bean> <bean id="helloChina" class="E:\ompnew\springTest\src\com\test\HelloChina"></bean> <bean id="person" class="com.test.Person"> <property name="helloMesage" ref="helloWord"></property> </bean> </beans>

    person:

    package com.test; public class Person { private IHelloMessage helloMessage; public IHelloMessage getHelloMessage() { return helloMessage; } public void setHelloMessage(IHelloMessage helloMessage) { this.helloMessage = helloMessage; } public void sayHello(){ System.out.println(helloMessage.sayMessage()); } } hellomessage: package com.test; public interface IHelloMessage { public String sayMessage(); } helloworld: package com.test; public class HelloWorld implements IHelloMessage{ @Override public String sayMessage() { // TODO Auto-generated method stub return "hello everyone !!!"; } } main: package com.test; importorg.springframework.core.io.FileSystemResource; import org.springframework.core.io.Resource; importorg.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.xml.*; public class Main { public static void main(String args[]){ Resource res=new FileSystemResource("E:\\ompnew\\springTest\\src\\com\\test\\helloMessage.xml"); BeanFactory bf=new XmlBeanFactory(res); Person p=(Person) bf.getBean("person"); p.sayHello(); } } 好吧,代码就是这么简单,但此处注意,person的property与Person的属性对应,如若名称不同则会出下面错误: org.springframework.beans.NotWritablePropertyException: Invalid property 'helloMesage' of bean class [com.test.Person]: Bean property 'helloMesage' is not writable or has an invalid setter method. Did you mean 'helloMessage'?
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