Spring入门

Spring的本结构

在src的根目录下有个bean.xml文件

关于xml文件是提示问题

可以这样的设置（在eclipse）

Window -> preferences->xml->xml catalog->add->在location的fileSYS

E:\hiberbate&Spring\spring\spring-beans-3.0.xsd

一个简单的Spring 如下：

在bean 文件

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns="http://www.springframework.org/schema/beans"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<!-- 将PersonService类部署成Spring容器中的Bean -->

<bean id="personService" class="org.crazyit.app.service.PersonService">

<property name="name" value="wawa"/>

</bean>

</beans>

package org.crazyit.app.service;

public class PersonService

{

private String name;

//name属性的setter方法

public void setName(String name)

{

this.name = name;

}

//测试Person类的info方法

public void info()

{

System.out.println("此人名为："

+ name);

}

在设置有参数的构造方法时；一定要有

public PersonService(){}

public PersonService(String name){}

}

package lee;

import org.crazyit.app.service.PersonService;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringTest

{

public static void main(String[] args)

{

//创建Spring的ApplicationContext

ApplicationContext ctx = new ClassPathXmlApplicationContext

("bean.xml");

//输出Spring容器

System.out.println(ctx);

PersonService p = ctx.getBean("personService" , PersonService.class);

//p.setName("dsfaf");

p.info();

}

}

这一切都依赖Spring 容器

Spring容器根据配置文件信息，负责创建person实例

IOC(inversion of Control)

Di(dependency lnjection)

scope

The scope of this bean: typically "singleton" (one shared instance, which will be returned by

all calls to getBean with the given id), or "prototype" (independent instance resulting from

each call to getBean). By default, a bean will be a singleton, unless the bean has a parent

bean definition in which case it will inherit the parent's scope. Singletons are most commonly

used, and are ideal for multi-threaded service objects. Further scopes, such as "request" or

"session", might be supported by extended bean factories (e.g. in a web environment). Inner

bean definitions inherit the singleton status of their containing bean definition, unless

explicitly specified: The inner bean will be a singleton if the containing bean is a singleton,

and a prototype if the containing bean has any other scope.