Spring 4 依赖注入

对于bean的属性 进行注入

1.参数注入

<bean id="user" class="com.cai.helloworld.User">  <property name="id" value="1" ></property>  <property name="username" value="cai"></property>  <property name="password" value="123"></property>  <property name="age" value="12"></property>  </bean>

2.构造方法注入 可以是name也可以是index 

<bean id="user" class="com.cai.helloworld.User">  <constructor-arg name="id" value="1" ></constructor-arg>  <constructor-arg name="username" value="cai"></constructor-arg>  <constructor-arg name="age" value="12"></constructor-arg>  <constructor-arg name="password" value="123"></constructor-arg>  </bean>

3.工厂注入，有静态和非静态，非静态bean写一个factory-bean 静态直接调用方法（非静态不写）

 <bean id="user" class="com.cai.helloworld.CreatUser" factory-method="creatUser"></bean>

public class CreatUser {    public static User creatUser(){        User user=new User();        user.setId(1);        user.setAge("12");        user.setPassword("123");        user.setUsername("cai");        return user;    }}

感觉还是第一个参数注入舒服点

4.内部bean，list，map使用，主要要new map（）

<bean name="dog" class="com.cai.helloworld.Dog"></bean>      <bean id="user" class="com.cai.helloworld.User">  <property name="id" value="1" ></property>  <property name="username" value="cai"></property>  <property name="password" value="123"></property>  <property name="age" value="12"></property>  /  <!--  引用<property name="dog" ref="dog" >-->  <!-- 内部bean -->  <property name="dog"  >  <bean class="com.cai.helloworld.Dog">  <property name="name" value="tom"></property>  <property name="age" value="1"></property>  </bean>  </property>  <property name="hobbys"  >  <list>  <value>唱歌</value>  <value>跳舞</value>  </list>  </property>  <property name="nameandage"  >  <map>  <entry>  <key><value>上午</value></key>  <value>1</value>  </entry>  </map>  </property>  </bean>

public class User {    private int id;    private String username;    private String password;    private String age;    private Dog dog=new Dog();    private java.util.List<String> hobbys=new ArrayList<String>();    private Map<String ,Integer > nameandage=new HashMap<String,Integer>();