J2EE之Spring中Bean的配置细节

J2EE之Spring中Bean的配置细节

代码实现：

Car.java:

package com.mooc.spring.beans;

public class Car {

private String brand;
private String corp;
private double price;
private int maxSpeed;
public Car(String brand, String corp, double price) {
super();
this.brand = brand;
this.corp = corp;
this.price = price;
}

public Car(String brand, String corp, int maxSpeed) {
super();
this.brand = brand;
this.corp = corp;
this.maxSpeed = maxSpeed;
}

public Car(String brand, String corp, double price, int maxSpeed) {
super();
this.brand = brand;
this.corp = corp;
this.price = price;
this.maxSpeed = maxSpeed;
}

@Override
public String toString() {
return "Car [brand=" + brand + ", corp=" + corp + ", price=" + price + ", maxSpeed=" + maxSpeed + "]";
}

public void setMaxSpeed(int maxSpeed) {
this.maxSpeed = maxSpeed;
}

public void setPrice(double price) {
this.price = price;
}

}

Person.java:

package com.mooc.spring.beans;

public class Person {
private String name;
private int age;

private Car car;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public Car getCar() {
return car;
}

public void setCar(Car car) {
this.car = car;
}

@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", car=" + car + "]";
}

public Person() {
super();
}

public Person(String name, int age, Car car) {
super();
this.name = name;
this.age = age;
this.car = car;
}

}

main.java:

package com.mooc.spring.beans;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.Locale;
import java.util.Map;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.MessageSourceResolvable;
import org.springframework.context.NoSuchMessageException;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.env.Environment;
import org.springframework.core.io.Resource;

public class main {

public static void main(String[] args) {
/*
//创建HelloWord的一个对象

HelloWord helloWord=new HelloWord();
//为那么赋值
helloWord.setName("atguigu");
helloWord.hello();

*/

//1.创建SpringIOC的容器对象

//ApplicationContext 代表IOC容器
//ClassPathXmlApplicationContext：从 类路径下加载配置文件,是ApplicationContext接口的实现类
//FileSystemXmlApplicationContext: 从文件系统中加载配置文件,是ApplicationContext接口的实现类
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

//      2.从IOC容器中获取Bean对象
//      HelloWord helloWord=(HelloWord) context.getBean("helloWord");
HelloWord helloWord=context.getBean(HelloWord.class);//适用类型获取，只适用于唯一的一哥bean
System.out.println(helloWord);

//调用hello方法
helloWord.hello();

Car car=(Car) context.getBean("car");
System.out.println(car);

car =(Car) context.getBean("car2");
System.out.println(car);

Person person=(Person) context.getBean("person");
System.out.println(person);

person=(Person) context.getBean("person2");
System.out.println(person);

}

}

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:util="http://www.springframework.org/schema/util"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> 
<!-- 配置bean
class:bean的全类名，通过反射的方式在IOC容器中创建Bean，所以要求Bean中必须有无参数的构造器
id:标示容器中的bean，id必须唯一  HelloWord helloWord=(HelloWord) context.getBean("helloWord");
-->
<bean id="helloWord" class="com.mooc.spring.beans.HelloWord">
<property name="name" value="Spring"></property>
</bean>

<!-- 通过构造方法来配置Bean的属性  ,用index确定顺序，以type确定类型，以区分重载构造器-->
<bean id="car" class="com.mooc.spring.beans.Car">
<constructor-arg value="Audi" index="0"></constructor-arg>
<!-- 如果字面值包含特殊字符可以使用<![CDATA[<字面值>]]>包裹起来 -->
<!-- 属性值可以使用value子节点直接进行配置 -->
<constructor-arg index="1">
<value><![CDATA[<shanghai>]]></value>
</constructor-arg>
<constructor-arg value="300000" type="double"> </constructor-arg>
</bean>

<bean id="car2" class="com.mooc.spring.beans.Car">
<constructor-arg value="Baoma" type="java.lang.String"></constructor-arg>
<constructor-arg value="shanghai" type="java.lang.String"></constructor-arg>
<constructor-arg type="int">
<value>250</value>
</constructor-arg>
</bean>

<bean id="person" class="com.mooc.spring.beans.Person">
<property name="name" value="Tom"></property>
<property name="age" value="24"></property>
<!-- 可以使用property的ref属性建立bean之间的引用关系 -->
<property name="car" ref="car2"></property>

<!--
也可以写成以下方式
<property name="car>
<ref bean="car2 />
</property>
-->
<!--
内部bean： 不能被外部引用，只能在内部被引用，不需使用id=“”
<property name="car">
<bean class="com.mooc.spring.beans.Car">
<constructor-arg value="Baoma" type="java.lang.String"></constructor-arg>
<constructor-arg value="shanghai" type="java.lang.String"></constructor-arg>
<constructor-arg type="double" value="200000"></constructor-arg>
</bean>
</property>
<property name="car.maxSpeed" value="8"></property>

-->
</bean>

<bean id="person2" class="com.mooc.spring.beans.Person">
<constructor-arg value="Jerry"></constructor-arg>
<constructor-arg value="25"></constructor-arg>
<constructor-arg ref="car2"></constructor-arg>
<!-- 测试赋值null
<constructor-arg><null/></constructor-arg>
-->
<!-- 级联属性的配置 ,属性先要初始化，后才可以被级联属性赋值，否则会爆出异常，和Struct2不同
<constructor-arg ref="car"></constructor-arg>
<property name="car.maxSpeed" value="8"></property>
-->
</bean>

</beans>

代码实现：

Person.java:

package com.mooc.spring.beans.collections;

import java.util.List;

import com.mooc.spring.beans.Car;

public class Person {
private String name;
private int age;

private List<Car> cars;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public List<Car> getCars() {
return cars;
}

public void setCars(List<Car> cars) {
this.cars = cars;
}

@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", cars=" + cars + "]";
}

}

NewPerson.java:

package com.mooc.spring.beans.collections;

import java.util.List;
import java.util.Map;

import com.mooc.spring.beans.Car;

public class NewPerson {
private String name;
private int age;

private Map<String, Car> cars;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}
public Map<String, Car> getCars() {
return cars;
}
public void setCars(Map<String, Car> cars) {
this.cars = cars;
}
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", cars=" + cars + "]";
}

}

DataSourse.java:

package com.mooc.spring.beans.collections;

import java.util.Properties;

public class DataSourse {
private Properties properties;

public Properties getProperties() {
return properties;
}

public void setProperties(Properties properties) {
this.properties = properties;
}

@Override
public String toString() {
return "DataSourse [properties=" + properties + "]";
}

}

main.java:

package com.mooc.spring.beans.collections;

import java.util.Properties;

public class DataSourse {
private Properties properties;

public Properties getProperties() {
return properties;
}

public void setProperties(Properties properties) {
this.properties = properties;
}

@Override
public String toString() {
return "DataSourse [properties=" + properties + "]";
}

}

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:util="http://www.springframework.org/schema/util"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> 
<!-- 配置bean
class:bean的全类名，通过反射的方式在IOC容器中创建Bean，所以要求Bean中必须有无参数的构造器
id:标示容器中的bean，id必须唯一  HelloWord helloWord=(HelloWord) context.getBean("helloWord");
-->
<bean id="helloWord" class="com.mooc.spring.beans.HelloWord">
<property name="name" value="Spring"></property>
</bean>

<!-- 通过构造方法来配置Bean的属性  ,用index确定顺序，以type确定类型，以区分重载构造器-->
<bean id="car" class="com.mooc.spring.beans.Car">
<constructor-arg value="Audi" index="0"></constructor-arg>
<!-- 如果字面值包含特殊字符可以使用<![CDATA[<字面值>]]>包裹起来 -->
<!-- 属性值可以使用value子节点直接进行配置 -->
<constructor-arg index="1">
<value><![CDATA[<shanghai>]]></value>
</constructor-arg>
<constructor-arg value="300000" type="double"> </constructor-arg>
</bean>

<bean id="car2" class="com.mooc.spring.beans.Car">
<constructor-arg value="Baoma" type="java.lang.String"></constructor-arg>
<constructor-arg value="shanghai" type="java.lang.String"></constructor-arg>
<constructor-arg type="int">
<value>250</value>
</constructor-arg>
</bean>

<bean id="person" class="com.mooc.spring.beans.Person">
<property name="name" value="Tom"></property>
<property name="age" value="24"></property>
<!-- 可以使用property的ref属性建立bean之间的引用关系 -->
<property name="car" ref="car2"></property>

<!--
也可以写成以下方式
<property name="car>
<ref bean="car2 />
</property>
-->
<!--
内部bean： 不能被外部引用，只能在内部被引用，不需使用id=“”
<property name="car">
<bean class="com.mooc.spring.beans.Car">
<constructor-arg value="Baoma" type="java.lang.String"></constructor-arg>
<constructor-arg value="shanghai" type="java.lang.String"></constructor-arg>
<constructor-arg type="double" value="200000"></constructor-arg>
</bean>
</property>
<property name="car.maxSpeed" value="8"></property>

-->
</bean>

<bean id="person2" class="com.mooc.spring.beans.Person">
<constructor-arg value="Jerry"></constructor-arg>
<constructor-arg value="25"></constructor-arg>
<constructor-arg ref="car2"></constructor-arg>
<!-- 测试赋值null
<constructor-arg><null/></constructor-arg>
-->
<!-- 级联属性的配置 ,属性先要初始化，后才可以被级联属性赋值，否则会爆出异常，和Struct2不同
<constructor-arg ref="car"></constructor-arg>
<property name="car.maxSpeed" value="8"></property>
-->
</bean>

<!-- 测试如何配置集合属性 使用list节点为list属性赋值 -->
<bean id="person3" class="com.mooc.spring.beans.collections.Person">
<property name="name" value="fzw"></property>
<property name="age" value="27"></property>
<property name="cars">
<list>
<ref bean="car"/>
<ref bean="car2"/>
<bean class="com.mooc.spring.beans.Car">
<constructor-arg value="fort" type="java.lang.String"></constructor-arg>
<constructor-arg value="shanghai" type="java.lang.String"></constructor-arg>
<constructor-arg type="double" value="200000"></constructor-arg>
</bean>
</list>
</property>
</bean>

<!-- 配置Map属性值  使用map节点及entry子节点配置Map类型的成员变量-->
<bean id="newPerson" class="com.mooc.spring.beans.collections.NewPerson">
<property name="name" value="Rose"></property>
<property name="age" value="17"></property>
<property name="cars">
<map>
<entry key="AA" value-ref="car"></entry>
<entry key="BB" value-ref="car2"></entry>
</map>
</property>
</bean>

<!-- 配置Properties配置属性  ,使用 props和prop为properties属性赋值-->
<bean id="dataSourse" class="com.mooc.spring.beans.collections.DataSourse">
<property name="properties">
<props>
<prop key="user">root</prop>
<prop key="password">123456</prop>
<prop key="jdbcUrl">jdbc:mysql:///test</prop>
<prop key="driverClass">com.mysql.jdbc.Driver</prop>
</props>
</property>
</bean>

<!-- 配置单例的集合bean，以供多个bean进行引用,**需要导入util命名空间**  使用util把bean独立出来 -->
<util:list id="cars">
<ref bean="car" />
<ref bean="car2" />
</util:list>

<bean id="person4" class="com.mooc.spring.beans.collections.Person">
<property name="name" value="jack"></property>
<property name="age" value="29"></property>
<property name="cars" ref="cars"></property>

</bean>

<!-- 通过p命名空间为bean的属性赋值，**需要先导入p命名空间** ,相对于传统的配置方式更加简洁-->
<bean id="person5" class="com.mooc.spring.beans.collections.Person" p:age="30" p:name="queen" p:cars-ref="cars"></bean>

</beans>