手动装配Bean

代码：

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class Main {
    public static void main(String[] args)   {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        Person person = (Person) ctx.getBean("person");
        System.out.println(person);
    }
}
 
 class Car {
    private String brand;
    private double price;
    public String getBrand() {
        return brand;
    }
    public void setBrand(String brand) {
        this.brand = brand;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "Car [brand=" + brand + ", price=" + price + "]";
    }
}
 
  class Address {
    private String city;
    private String street;
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getStreet() {
        return street;
    }
    public void setStreet(String street) {
        this.street = street;
    }
    @Override
    public String toString() {
        return "Address [city=" + city + ", street=" + street + "]";
    }
}
 
 class Person {
    private String name;
    private Address address;
    private Car car;
 
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Address getAddress() {
        return address;
    }
    public void setAddress(Address address) {
        this.address = address;
    }
    public Car getCar() {
        return car;
    }
    public void setCar(Car car) {
        this.car = car;
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", address=" + address + ", car=" + car
                + "]";
    }
}

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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd">
 
    <!-- 手动装配Bean -->
    <bean id="address" class="com.company.Address"
          p:city="WhuHan" p:street="Bayi"></bean>
 
    <bean id="car" class="com.company.Car"
          p:brand="Audi" p:price="300000"></bean>
 
    <bean id="person" class="com.company.Person"
          p:name="Roger" p:address-ref="address" p:car-ref="car"></bean>
 
</beans>

结果：

Person [name=Roger, address=Address [city=WhuHan, street=Bayi], car=Car [brand=Audi, price=300000.0]]

对applicationContext.xml进行修改

    <bean id="person" class="com.company.Person"
          p:name="Roger" ></bean>

结果：

Person [name=Roger, address=null, car=null]

<?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:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd">
 
    <!-- 手动装配Bean -->
    <bean id="address" class="com.company.Address"
          p:city="WhuHan" p:street="Bayi"></bean>
 
    <bean id="car" class="com.company.Car"
          p:brand="Audi" p:price="300000"></bean>
 
    <bean id="person" class="com.company.Person"
          p:name="Roger" autowire="byName"></bean>
</beans>    

Person [name=Roger, address=Address [city=WhuHan, street=Bayi], car=Car [brand=Audi, price=300000.0]]

使用自动装配auotwire="byName"

将上面的autowire改成byType一样可以运行，结果也一样。

自动检测Bean

    <context:component-scan
            base-package="com.company">
    </context:component-scan>

https://my.oschina.net/u/1020238/blog/502599

https://my.oschina.net/u/1020238/blog/502930

http://blog.csdn.net/evankaka/article/details/45023835