spring 配置bean
Posted 啄木鸟伍迪
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了spring 配置bean相关的知识，希望对你有一定的参考价值。
Main(测试方法)
public class Main {
public static void main(String[] args) {
//1.创建Spring 的IOC容器对象；
//spring提供了两种IOC容器的实现
//1.BeanFactory:面向spring本身，，（就是底层的东西）
//2.ApplicationContext: 面向使用spring框架的开发者，她提供了更多高级特性，是BeanFactory的子接口
// ----ConfigurableApplicationContext:ApplicationContext的子接口；增加了两个方法，refresh()和close()
// -------主要实现类ClassPathXmlApplicationContext:从类路径下加载配置文件
//--------主要实现类FileSystemXmlApplicationContext:从文件系统中加载配置文件
//applicationContext 代表IOC容器，
ApplicationContext cxt = new ClassPathXmlApplicationContext("applicationContext.xml");
//2.从IOC容器中获取beans实例
HelloWorld helloWorld =(HelloWorld) cxt.getBean("helloWorld");
//3.调用hello方法
helloWorld.hello();
Car car = (Car) cxt.getBean("car");
System.out.println(car);
Car car2 = (Car)cxt.getBean("car2");
System.out.println(car2);
Person person = (Person) cxt.getBean("person");
System.out.println(person);
Person1 person3 = (Person1)cxt.getBean("person3");
System.out.println("集合属性：：："+person3);
Person2 person2 = (Person2)cxt.getBean("person2");
System.out.println("Map属性：：："+person2);
DataSource dataSource = (DataSource) cxt.getBean("dataSource");
System.out.println(dataSource);
Person1 person4 = (Person1)cxt.getBean("person4");
System.out.println("集合属性：：："+person4);
Person2 person5 = (Person2)cxt.getBean("person5");
System.out.println("Map属性：：："+person5);
Person1 person6 = (Person1)cxt.getBean("person6");
System.out.println("p属性：：："+person6);
}
/**************************************************************************************/
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的路径一般都是包名+类名，中间用“.”分开
class:bean的全类目名，通过反射的方式在IOC容器中穿件Bean,所以要求bean中有无参数的构造器
id:标识容器中的bean,id值唯一
-->
<!-- property 是属性配置，这里是属性注入 -->
<bean id="helloWorld" class ="lixiuming.spring.beans.HelloWorld">
<property name="name" value="Spring"></property>
</bean>
<!-- 通过构造方法来配置bean属性 ,可以指定参数的位置和参数的类型，来区分重载的构造器 value值可以拿到外面，遇到特殊字符用CDATA-->
<bean id="car" class="lixiuming.spring.beans.Car">
<constructor-arg index="0">
<value><![CDATA[<Shanghai>]]></value>
</constructor-arg>
<constructor-arg index="1">
<value>shanghai</value>
</constructor-arg>
<constructor-arg value="30000000" index="2"></constructor-arg>
</bean>
<bean id="car2" class="lixiuming.spring.beans.Car">
<constructor-arg value="Audi" index="0"></constructor-arg>
<constructor-arg value="Shanghai" index="1"></constructor-arg>
<constructor-arg value="240" index="2" type="int"></constructor-arg>
</bean>
<!-- 配置person
——引用其他外部Bean ref="car2"
——内部Bean创建 内部的bean 不能被外部引用
——级联属性
-->
<bean id="person" class="lixiuming.spring.beans.Person">
<property name="name" value="LiXiuming"></property>
<property name="age" value="18" ></property>
<!-- <property name="car" ref="car2"></property>
--> <!-- 内部Bean引用 -->
<property name= "car">
<bean class="lixiuming.spring.beans.Car">
<constructor-arg value="Fode"></constructor-arg>
<constructor-arg value="Changan"></constructor-arg>
<constructor-arg value="200" type="int"></constructor-arg>
</bean>
</property>
<property name="car.price" value="300000"></property>
</bean>
<!-- 配置集合属性 -->
<bean id="person3" class="lixiuming.spring.beans.Person1">
<property name="name" value="Mike"></property>
<property name="age" value="20"></property>
<property name="car" >
<list>
<ref bean="car"></ref>
<ref bean="car2"></ref>
<bean class="lixiuming.spring.beans.Car">
<constructor-arg value="Fode"></constructor-arg>
<constructor-arg value="Changan"></constructor-arg>
<constructor-arg value="200" type="int"></constructor-arg>
</bean>
</list>
</property>
</bean>
<!-- 配置Map属性值 -->
<bean id="person2" class="lixiuming.spring.beans.Person2">
<property name="name" value="tom"></property>
<property name="age" value="25"></property>
<property name="car">
<map>
<entry key="aa" value-ref="car"></entry>
<entry key="bb" value-ref="car2"></entry>
</map>
</property>
</bean>
<!-- 配置Property属性值 需要导入util 命名空间-->
<bean id="dataSource" class="lixiuming.spring.beans.DataSource" >
<property name="properties">
<props>
<prop key="user"> root</prop>
<prop key="password"></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调用 -->
<util:list id="cars">
<ref bean="car"/>
<ref bean="car2"/>
</util:list>
<bean id="person4" class="lixiuming.spring.beans.Person1">
<property name="name" value="Jack"></property>
<property name="age" value="18"></property>
<property name="car" ref="cars"> </property>
</bean>
<!-- 配置单例的map bean以供多个bean调用 -->
<util:map id="carsmap">
<entry key="aa" value-ref="car"></entry>
<entry key="bb" value-ref="car2"></entry>
</util:map>
<bean id="person5" class="lixiuming.spring.beans.Person2">
<property name="name" value="Jack"></property>
<property name="age" value="18"></property>
<property name="car" ref="carsmap"> </property>
</bean>
<!-- 配置P命名空间为bean的属性赋值，需要先导入P命名空间 -->
<bean id="person6" class="lixiuming.spring.beans.Person1" p:age="30" p:name="aaa" p:car-ref="cars"></bean>
<!-- 对比配置servlet
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>com.bro.HelloServlet3</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>
-->
</beans>
/**************************************************************************************/
附录
public class HelloWorld {
private String name;
public void setName(String name){
this.name = name;
System.out.println("setName:"+name);
}
public void hello(){
System.out.println("hello:"+name);
}
}
/**************************************************************************************/
public class Car {
private String brand;
private String corp;
private double price;
private int maxSpeed;
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public String getCorp() {
return corp;
}
public void setCorp(String corp) {
this.corp = corp;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getMaxSpeed() {
return maxSpeed;
}
public void setMaxSpeed(int maxSpeed) {
this.maxSpeed = 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;
}
@Override
public String toString() {
return "Car [brand=" + brand + ", corp=" + corp + ", price=" + price + ", maxSpeed=" + maxSpeed + "]";
}
}
/**************************************************************************************/
public class DataSource {
private Properties properties;
public Properties getProperties() {
return properties;
}
public void setProperties(Properties properties) {
this.properties = properties;
}
@Override
public String toString() {
return "DataSource [properties=" + properties + "]";
}
/**************************************************************************************/
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 class Person1 {
private String name;
private int age;
private List<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 List<Car> getCar() {
return car;
}
public void setCar(List<Car> car) {
this.car = car;
}
@Override
public String toString() {
return "Person1 [name=" + name + ", age=" + age + ", car=" + car + "]";
}
}
/**************************************************************************************/
public class Person2 {
private String name;
private int age;
private Map<String,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 Map<String, Car> getCar() {
return car;
}
public void setCar(Map<String, Car> car) {
this.car = car;
}
@Override
public String toString() {
return "Person2 [name=" + name + ", age=" + age + ", car=" + car + "]";
}
}
/**************************************************************************************/
以上是关于spring 配置bean的主要内容，如果未能解决你的问题，请参考以下文章