Spring 之 Bean的属性注入

Dear 丶 2022-09-21 13:23 213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>