Spring 属性注入

1. 构造函数注入

<bean id="person" class="com.ibuyi.free.Case_one.Person">
         <constructor-arg name="name" value="Yang"/>
         <constructor-arg name="age" value="20"/>
   </bean>

2. setter方法注入

private String name;
    private Integer age;
    public Person(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;
    }

<bean id="person" class="com.ibuyi.free.Case_one.Person">
         <property name="name" value="Yang"/>
         <property name="age" value="20"/>
</bean>

3. -p名称空间

<beans 
xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
<!--这里需要引入p空间-->
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
   <bean id="person" class="com.ibuyi.free.Case_one.Person" 
         p:name="yangkun" p:age="30">
   </bean>
</beans>

4. Spring SqEL注入

<bean id="year" class="com.ibuyi.free.Case_one.Age"/>
    <bean id="person" class="com.ibuyi.free.Case_one.Person">
        <property name="name" value="#{'yang'}"></property>
        <property name="age" value="#{year.getAge(50)}"></property>
    </bean>

其中Age.java

package com.ibuyi.free.Case_one;

public class Age {
    public int getAge(int age){
        return age+10;
    }
}

结果：

5. 复杂类型的注入

package com.ibuyi.free.Case_one;

import java.lang.reflect.Array;
import java.util.*;

public class Collection {
    private String ars[];
    private List<String> list;
    private Set<String> set;
    private Map<String,Integer> map;
    private Properties properties;


    public String[] getArs() {
        return ars;
    }

    public void setArs(String[] ars) {
        this.ars = ars;
    }

    public List<String> getList() {
        return list;
    }

    public void setList(List<String> list) {
        this.list = list;
    }

    public Set<String> getSet() {
        return set;
    }

    public void setSet(Set<String> set) {
        this.set = set;
    }

    public Map<String, Integer> getMap() {
        return map;
    }

    public void setMap(Map<String, Integer> map) {
        this.map = map;
    }

    public Properties getProperties() {
        return properties;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    @Override
    public String toString() {
        return "Collection{" +
                "ars=" + Arrays.toString(ars) +
                ", list=" + list +
                ", set=" + set +
                ", map=" + map +
                ", properties=" + properties +
                '}';
    }
}

<bean id="collection" class="com.ibuyi.free.Case_one.Collection">
        <property name="ars">
            <list>
                <value>aaa</value>
                <value>bbb</value>
                <value>ccc</value>
            </list>
        </property>
        <property name="list">
            <list>
                <value>ddd</value>
                <value>eee</value>
                <value>fff</value>
            </list>
        </property>
        <property name="set">
            <set>
                <value>ggg</value>
                <value>hhh</value>
                <value>iii</value>
            </set>
        </property>
        <property name="map">
            <map>
                <entry value="1" key="jjj"></entry>
            </map>
        </property>
        <property name="properties">
            <props>
                <prop key="username">root</prop>
                <prop key="password">123456</prop>
            </props>
        </property>
    </bean>