-
基礎配置模版
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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="..." class="...">
<!-- collaborators and configuration for this bean go here -->
</bean>
<bean id="..." class="...">
<!-- collaborators and configuration for this bean go here -->
</bean>
<!-- more bean definitions go here -->
</beans>
- 配置文件的名字可以根據自己需要進行定義
-
使用這個配置文件
//加載配置文件，創建配置文件的bean
ApplicationContext context =new ClassPathXmlApplicationContext("Spring.xml");
//第一種方法：根據id取到配置的bean
Person per1 = (Person) context.getBean("person");
//第二種
Person per2 = context.getBean("person",Person.class);
//默認是單例模式，spring容器一直持有這個對象
System.out.println(per1==per2);
-
設置成非單例模式，每次想spring容器請求對象，spring都創建一個新的返回
<bean id="t3" class="i.test.Test3" scope="prototype" />
-
可以一次加載多個配置文件
ApplicationContext context =new ClassPathXmlApplicationContext("Spring.xml","Beans.xml");
-
將多個配置文件導入一個配置文件中
<beans>
<import resource="services.xml"/>
<import resource="resources/messageSource.xml"/>
<import resource="/resources/themeSource.xml"/>
<bean id="bean1" class="..."/>
<bean id="bean2" class="..."/>
</beans>
-
爲id設置別名
<!-- id="t2" 設置別名 t3 -->
<alias name="t2" alias="t3"/>
-
靜態工廠方法
public class FactoryBean {
private static Test2 t2 = new Test2();
private FactoryBean() {}
public static Test2 getInstanceT2() {
return t2;
}
}
<!-- Spring不會初始化這個class，而是每次調用getInstanceT2 -->
<bean id="t2" class="i.test.FactoryBean" factory-method="getInstanceT2" />
如果getInstanceT2 不是靜態的方法，就要將類初始化，然後調用
<bean id="factoryBean" class="i.test.FactoryBean" />
<bean id="t2" factory-bean="factoryBean" factory-method="getInstanceT2" />
-
配置有參數構造器
public class Test3 {
public Test3(Test1 t1, String str, int i) {
}
}
配置1
<bean id="t1" class="i.test.Test1" />
<bean id="t3" class="i.test.Test3">
<constructor-arg ref="t1" />
<constructor-arg type="java.lang.String" value="1"/>
<constructor-arg type="int" value="2"/>
</bean>
配置2：
<bean id="t1" class="i.test.Test1" />
<bean id="t3" class="i.test.Test3">
<constructor-arg index="0" ref="t1" />
<constructor-arg index="1" value="1"/>
<constructor-arg index="2" value="2"/>
</bean>
配置3：
<bean id="t1" class="i.test.Test1" />
<bean id="t3" class="i.test.Test3">
<constructor-arg name="t1" ref="t1" />
<constructor-arg name="i" value="1"/>
<constructor-arg name="str" value="2"/>
</bean>
-
set方法注入
public class Test3 {
private Test1 t1;
private Test2 t2;
private int i;
public void setT1(Test1 t1) {
this.t1 = t1;
}
public void setT2(Test2 t2) {
this.t2 = t2;
}
public void setInteger(int i) {
this.i = i;
}
}
配置
<bean id="t1" class="i.test.Test1" />
<bean id="t2" class="i.test.Test2" />
<bean id="t3" class="i.test.Test3">
<property name="test1"><ref bean="t1" /></property>
<property name="test2" ref="t2" />
<property name="integer" value="1" />
</bean>
-
構造器注入
public class Test3 {
private Test1 t1;
private Test2 t2;
private int i;
public Test3(Test1 t1, Test2 t2, int i) {
this.t1 = t1;
this.t2 = t2;
this.i = i;
}
}
<bean id="t1" class="i.test.Test1" />
<bean id="t2" class="i.test.Test2" />
<bean id="t3" class="i.test.Test3">
<constructor-arg><ref bean="t1" /></constructor-arg>
<constructor-arg ref="t2" />
<constructor-arg type="int" value="1" />
</bean>
-
配置一個帶參數的靜態工廠方法
public class Test3 {
private Test1 t1;
private Test2 t2;
private int i;
private Test3(Test1 t1, Test2 t2, int i) {
this.t1 = t1;
this.t2 = t2;
this.i = i;
}
public static Test3 createInstance(Test1 t1, Test2 t2, int i){
return new Test3(t1, t2, i);
}
}
<bean id="t1" class="i.test.Test1" />
<bean id="t2" class="i.test.Test2" />
<bean id="t3" class="i.test.Test3" factory-method="createInstance">
<constructor-arg ref="t1" />
<constructor-arg ref="t2" />
<constructor-arg value="1" />
</bean>
-
定義<property/> or
<constructor-arg/>內部屬性bean
<bean id="outer" class="...">
<!-- instead of using a reference to a target bean, simply define the target bean inline -->
<property name="target">
<bean class="com.example.Person"> <!-- this is the inner bean -->
<property name="name" value="Fiona Apple"/>
<property name="age" value="25"/>
</bean>
</property>
</bean>
-
collections
<bean id="moreComplexObject" class="example.ComplexObject">
<!-- results in a setAdminEmails(java.util.Properties) call -->
<property name="adminEmails">
<props>
<prop key="administrator">[email protected]</prop>
<prop key="support">[email protected]</prop>
<prop key="development">[email protected]</prop>
</props>
</property>
<!-- results in a setSomeList(java.util.List) call -->
<property name="someList">
<list>
<value>a list element followed by a reference</value>
<ref bean="myDataSource" />
</list>
</property>
<!-- results in a setSomeMap(java.util.Map) call -->
<property name="someMap">
<map>
<entry key="an entry" value="just some string"/>
<entry key ="a ref" value-ref="myDataSource"/>
</map>
</property>
<!-- results in a setSomeSet(java.util.Set) call -->
<property name="someSet">
<set>
<value>just some string</value>
<ref bean="myDataSource" />
</set>
</property>
</bean>
-
idref
<bean id="theTargetBean" class="..." />
<bean id="theClientBean" class="...">
<property name="targetName">
<idref bean="theTargetBean" />
</property>
</bean>
<!--上面效果等同下面，idref在加載時會檢查是否存在id=“theTargetBean”的bean -->
<bean id="client" class="...">
<property name="targetName" value="theTargetBean" />
</bean>
-
local跟bean的區別只加載當前xml的bean
<ref local="someBean"/>
<property name="targetName">
<idref local="theTargetBean"/>
</property>
-
可以通過parent來繼承屬性
<!-- abstract="true" 容器不會初始化這個bean，可作爲公共屬性使用 -->
<bean id="parent" abstract="true">
<property name="aa" value="xiao" />
<property name="ee" value="xiaoe" />
</bean>
<!-- 繼承id="parent"的屬性 -->
<bean id="child" class="i.test.Test3" parent="parent">
<property name="cc" value="xiaoc" />
</bean>
