Spring属性注入

对象类型的注入

值类型：value属性
对象类型：ref属性

<bean name="user" class="Object.User" init-method="init" destroy-method="destroy">    <property name="name" value="wuxiangsheng"></property>        <property name="age" value="20"></property>        <property name="car" ref="car"></property></bean><bean name="car" class="Object.Car">        <property name="name" value="奥迪"></property>        <property name="age" value="1"></property></bean>

Set方式注入

直接在配置文件中指定对象属性的值

<bean name="user" class="Object.User">    <property name="name" value="wuxiangsheng"></property>    <property name="age" value="20"></property></bean>

构造方法注入

使用constructor-arg，为构造方法的属性传参。

为了在多个构造方法中确定指定的构造方法，使用type属性和index属性。

<bean name="user" class="Object.User">    <constructor-arg name="name" value="zhangsan"></constructor-arg>    <constructor-arg name="age" value="30"></constructor-arg></bean>

p名称空间注入

值类型：p：属性名=值
对象类型：p：属性名-ref=对象bean名

<!-- 导入额外空间 -->xmlns:p="http://www.springframework.org/schema/p"

<bean name="user" class="Object.User" p:name="wxs" p:age="10" p:car-ref="car"></bean><bean name="car" class="Object.Car">    <property name="name" value="奥迪"></property>    <property name="age" value="1"></property></bean>

SPEL(Spring Expression Language)注入

spel注入需要和Set注入或构造方法注入结合使用。

将value值修改为#{Bean对象名.属性}的格式。

注：引用类型没有spel注入，因此仍然使用ref！

<bean name ="user" class="Object.User">    <property name="name" value="#{user1.name}"></property>    <property name="age" value="#{user1.age}"></property>    <property name="car" ref="car"></property></bean>

复杂类型注入

<bean name="cb" class="Object.CollectionBean">    <!-- 数组类型注入 -->        <property name="arr">            <array>                <value>wxs</value>                <value>员工</value>            </array>        </property>    <!-- List类型注入 -->        <property name="list">            <list>                <value>zhouyang</value>                <value>清理员</value>            </list>        </property>     <!-- Map类型注入 -->        <property name="map">            <map>                <entry key="姓名" value="吴祥生"></entry>                <entry key="年龄" value="20"></entry>                <entry key="汽车" value-ref="car"></entry>            </map>        </property>     <!-- properties类型注入 -->        <property name="properties">            <props>                <prop key="url">http://www.jitwxs.cn</prop>                <prop key="name">猿来极客</prop>            </props>        </property></bean><bean name="car" class="Object.Car">    <property name="name" value="奥迪"></property>    <property name="age" value="1"></property></bean>

相关JavaBean类

//User.javapackage Object;public class User {    private String name;    private Integer age;    private Car car;    public User(){}    public User(String name, Integer age) {        this.name = name;        this.age = age;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    public Car getCar() {        return car;    }    public void setCar(Car car) {        this.car = car;    }    @Override    public String toString() {        return "User [name=" + name + ", age=" + age + ", car=" + car + "]";    }}

//Car.javapackage Object;public class Car {    private String name;    private Integer age;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    @Override    public String toString() {        return "Car [name=" + name + ", age=" + age + "]";    }}

//CollectionBean.javapackage Object;import java.util.Arrays;import java.util.List;import java.util.Map;import java.util.Properties;public class CollectionBean {    private Object[] arr;    private List list;    private Map map;    private Properties properties;    public Map getMap() {        return map;    }    public void setMap(Map map) {        this.map = map;    }    public Object[] getArr() {        return arr;    }    public void setArr(Object[] arr) {        this.arr = arr;    }    public List getList() {        return list;    }    public void setList(List list) {        this.list = list;    }    public Properties getProperties() {        return properties;    }    public void setProperties(Properties properties) {        this.properties = properties;    }    @Override    public String toString() {        return "CollectionBean [arr=" + Arrays.toString(arr) + ", list=" + list + ", map=" + map + ", properties="                + properties + "]";    }}