三.Spring配置文件详解随笔

水深无声 2022-06-17 13:38 192阅读 0赞

## **一.** ##

**Bean 元素说明**

attributes:
    id
    name
    class
    parent
    abstract
    scope
    lazy-init
    autowire
    dependency-check
    depends-on
    init-method destroy-method factory-method factory-bean 子元素:
    description
    constructor-arg property lookup-method replace-method

## 二. ##

**Bean property:设置类属性值**

字面值：
          <property name=“maxSpeed”>
              <value>200</value> 
         </property>
         <property name=“brand”>
              <value><![CDATA[红旗&CA72]]</value>
         </property>
    引用其他Bean：
    public class Boss{
        private Car car;
        public void setCar(Car car) {
               this.car = car;
        }
    }
    <bean id=“car” class=“***”/>
    <bean id=“boss” class=“***”>
        <property name=“car”>
             <ref bean=“car”></ref>
        </property>
    </bean>
    内部Bean：
    <bean id=“boss” class=“***”/>
         <property name=“car”>
             <bean class=“***” >
                     <property name=“price” value=“200”>
              </bean>
        </property>
    </bean>
    null值：<null/>
    级联：public class Boss{
        private Car car = nea Car();
        public void setCar(Car car) {
               this.car = car;
        }
    }
    <bean id=“boss” class=“***”>
        <property name=“car.brand”>
             <value>奔驰E级</value>
        </property>
    </bean>
    属性(List)：
    public class Boss{
        private List favorites = new ArrayList();
        public List getFavorites()  {
                return favorites; 
          }
        public void setFavorites(List favorites)  {
               this.favorites = favorites;
         }
    }
    <bean id=“boss” class=“***”>
        <property name=“favorites”>
               <list>
                      <value>唱歌</value>
                      <value>运动</value>
                      <value>读书</value>
               </list>
          </property>
    </bean>
    属性(Set)：
    和List差别不大
    属性(Map)：
    public class Boss{
        private Map favorites;
        public Map getFavorites() {
             return favorites;  
        }
        public void setFavorites(Map  favorites){
             this.favorites = favorites;
         }
    }
    <bean id=“boss” class=“***”>
        <property name=“favorites”>
               <map>
                     <entry>
                          <key><value>key01</value></key> 
                          <value>唱歌</value>
                     </entry>
                     <entry>
                          <key><value>key02</value></key> 
                          <value>唱歌</value>
                     </entry>
                 </map>
          </property>
    </bean>
    
    集合合并：
    <bean id=“parentBoss”abstract=“true”class=“***”>
        <property name=“favorites”>
               <set>
                     <value>唱歌</value>
                     <value>运动</value>
                    <value>看书</value>
                </set>
        </property>
    </bean>
    
    <bean id=“childtBoss”parent=“parentBoss”>
        <property name=“favorites”>
               <set merge=“true”>
                     <value>旅游</value>
                     <value>睡觉</value>
                </set>
        </property>
    </bean>
    自动装配：
    autowire=“byName”
    autowire=“ byType ”
    autowire=“ constructor ”
    autowire=“ autodetect ”
    属性注入方法：
    Public class Car {
        private String brand;
        public void setBrand(String brand) {
              this.brand = brand;
         }
         public String getBrand() {
              return this.brand;
         }
    }
    <bean id=“car” class=“com.jike.***.Car” >
        <property name=“brand”>
             <value>奔驰</value>
         </property>
    </bean>
    构造函数注入：
    工厂方法注入：
    
    三.
    --
    
    Bean 的依赖关系:继承、依赖、引用
    继承：<bean id=“abstractCar” class=“com.jike.***.Car”/
         p:brand=“奔驰E300” p:price=“2000” p:color=“黑色” abstract=“true”>   ①
    <bean id=“car1” p:color=“红色” parent=“abstractCar” />②
    <bean id=“car1” p:color=“白色” parent=“abstractCar” />③
    依赖：保证Bean依赖的Bean已初始化
    <bean id=“manager” class=“com.jike.***.CacheManager” depends-on=“sysInit”; /> ①
    <bean id=“sysInit” class=“com.jike.***.SysInit” /> ② 
    引用：idref