Spring-依赖注入

目录

• 构造注入
• setter注入

构造注入

public class User1 {
    private int id;
    private String name;
    private String password;

    public User1(int id, String name, String password) {
        this.id = id;
        this.name = name;
        this.password = password;
    }

    @Override
    public String toString() {
        return "User1{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

//applicatonContext.xml
	<bean id="user1" class="edu.cyl.User1">
            <constructor-arg name="id" value="1"></constructor-arg>
            <constructor-arg name="name" value="老二"></constructor-arg>
            <constructor-arg name="password" value="123"></constructor-arg>
	</bean>

setter注入

public class User2 {
    private int id;
    private String name;
    private String password;

    public void setId(int id) {
        this.id = id;
    }

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

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User2{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

//applicationContext.xml
	<bean id="user2" class="edu.cyl.User2">
            <property name="id" value="2"></property>
            <property name="name" value="老三"></property>
            <property name="password" value="123"></property>
	</bean>