Spring 之 Bean的属性注入-蒲公英云

Spring 之 Bean的属性注入

Dear 丶 2022-09-21 13:23 301阅读 0赞

1.基本方式
a.构造函数

public class User {
    private String username;
    private String password;
    private Car car;
    public User(){
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public Car getCar() {
        return car;
    }
    public void setCar(Car car) {
        this.car = car;
    }
}
//配置
<bean id="user" class="com.brook.spring.injection.User">
        <property name="username" value="123"></property>
        <property name="password" value="123"></property>
</bean>

b.set方法注入

public class Car {
    private String id;
    private String band;    
    public Car(String id,String band)
    {
        this.setId(id);
        this.setBand(band);
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getBand() {
        return band;
    }
    public void setBand(String band) {
        this.band = band;
    }
}
//配置
<bean id="car" class="com.brook.spring.injection.Car">
       <constructor-arg name="id" value="123"></constructor-arg>
       <constructor-arg name="band" value="123"></constructor-arg>
</bean>

2.对象属性的注入

//配置,通过property中的ref来完成
<bean id="user" class="com.brook.spring.injection.User">
        <property name="username" value="123"></property>
        <property name="password" value="123"></property>
        <property name="car" ref="car" ></property>
</bean>