spring2

时间：2014-06-21 20:38:28 阅读：216 评论：0 收藏：0 [点我收藏+]

标签：spring

依赖注入两种方式：构造函数和属性
package x.y;
public class Foo {

public Foo(Bar bar, Baz baz) {
// ...
}

}
<beans>
<bean id="foo" class="x.y.Foo">
<constructor-arg ref="bar"/>
<constructor-arg ref="baz"/>
</bean>

<bean id="bar" class="x.y.Bar"/>

<bean id="baz" class="x.y.Baz"/>
</beans>

public class ExampleBean {

// Number of years to calculate the Ultimate Answer
private int years;

// The Answer to Life, the Universe, and Everything
private String ultimateAnswer;

public ExampleBean(int years, String ultimateAnswer) {
this.years = years;
this.ultimateAnswer = ultimateAnswer;
}

}

<bean id="exampleBean" class="examples.ExampleBean">
<constructor-arg type="int" value="7500000"/>
<constructor-arg type="java.lang.String" value="42"/>
</bean>
<bean id="exampleBean" class="examples.ExampleBean">
<constructor-arg index="0" value="7500000"/>
<constructor-arg index="1" value="42"/>
</bean>
<bean id="exampleBean" class="examples.ExampleBean">
<constructor-arg name="years" value="7500000"/>
<constructor-arg name="ultimateanswer" value="42"/>
</bean>
注意使用名称匹配，必须保证你的代码在debug 模式下编译了，否则spring 找不到名称。
还有另一种解决办法，就是使用java 注解：如下
package examples;

public class ExampleBean {

// Fields omitted

@ConstructorProperties({"years", "ultimateAnswer"})
public ExampleBean(int years, String ultimateAnswer) {
this.years = years;
this.ultimateAnswer = ultimateAnswer;
}

}

构造函数依赖多用于强制性的配置。
set 方法多用于可选择的属性配置。
public class ExampleBean {

private AnotherBean beanOne;
private YetAnotherBean beanTwo;
private int i;

public void setBeanOne(AnotherBean beanOne) {
this.beanOne = beanOne;
}

public void setBeanTwo(YetAnotherBean beanTwo) {
this.beanTwo = beanTwo;
}

public void setIntegerProperty(int i) {
this.i = i;
}

}
引用ref
<bean id="exampleBean" class="examples.ExampleBean">

<property name="beanOne">
<ref bean="anotherExampleBean"/>
</property>


<property name="beanTwo" ref="yetAnotherBean"/>
<property name="integerProperty" value="1"/>
</bean>

<bean id="anotherExampleBean" class="examples.AnotherBean"/>
<bean id="yetAnotherBean" class="examples.YetAnotherBean"/>

-----------------------------------常用配置
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-
method="close">

<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mydb"/>
<property name="username" value="root"/>
<property name="password" value="masterkaoli"/>
</bean>

p-namespace:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">

<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close"
p:driverClassName="com.mysql.jdbc.Driver"
p:url="jdbc:mysql://localhost:3306/mydb"
p:username="root"
p:password="masterkaoli"/>

</beans>

---------------------
<bean id="mappings"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">


<property name="properties">
<value>
jdbc.driver.className=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mydb
</value>
</property>
</bean>

------------引用父亲bean

<bean id="accountService" <-- bean name is the same as the parent bean -->
class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target">
<ref parent="accountService"/> 
</property>

</bean>

-----------内嵌bean
<bean id="outer" class="...">

<property name="target">
<bean class="com.example.Person"> 
<property name="name" value="Fiona Apple"/>
<property name="age" value="25"/>
</bean>
</property>
</bean>

----------------------集合bean
<list/>, <set/>, <map/>, and <props/>元素设置 Java 集合类型 List, Set, Map, and Properties
<bean id="moreComplexObject" class="example.ComplexObject">

<property name="adminEmails">
<props>
<prop key="administrator">administrator@example.org</prop>
<prop key="support">support@example.org</prop>
<prop key="development">development@example.org</prop>
</props>
</property>

<property name="someList">
<list>
<value>a list element followed by a reference</value>
<ref bean="myDataSource" />
</list>
</property>

<property name="someMap">
<map>
<entry key="an entry" value="just some string"/>
<entry key ="a ref" value-ref="myDataSource"/>
</map>
</property>

<property name="someSet">
<set>
<value>just some string</value>
<ref bean="myDataSource" />
</set>
</property>
</bean>
map的或者value set 的value 还可以在
是下面这些元素
bean | ref | idref | list | set | map | props | value | null

合并映射

<beans>
<bean id="parent" abstract="true" class="example.ComplexObject">
<property name="adminEmails">
<props>
<prop key="administrator">administrator@example.com</prop>
<prop key="support">support@example.com</prop>
</props>
</property>
</bean>
<bean id="child" parent="parent">
<property name="adminEmails">

<props merge="true">
<prop key="sales">sales@example.com</prop>
<prop key="support">support@example.co.uk</prop>
</props>
</property>
</bean>
<beans>
你知道的，child 的adminEmails 属性里包含了父子两个的属性集合。

强类型映射

public class Foo {

private Map<String, Float> accounts;

public void setAccounts(Map<String, Float> accounts) {
this.accounts = accounts;
}
}

<beans>
<bean id="foo" class="x.y.Foo">
<property name="accounts">
<map>
<entry key="one" value="9.99"/>
<entry key="two" value="2.75"/>
<entry key="six" value="3.99"/>
</map>
</property>
</bean>
</beans>

-----------------------空
<bean class="ExampleBean">
<property name="email" value=""/>
</bean>
<bean class="ExampleBean">
<property name="email">
<null/>
</property>
</bean>
------p-namespace
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">

<bean name="classic" class="com.example.ExampleBean">
<property name="email" value="foo@bar.com"/>
</bean>

<bean name="p-namespace" class="com.example.ExampleBean"
p:email="foo@bar.com"/>
</beans>

---c_namespace

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"
xmlns:c= "http://www.springframework.org/schema/c"
xsi:schemaLocation= "http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">

<bean id= "bar" class="x.y.Bar"/>
<bean id= "baz" class="x.y.Baz"/>


<bean id= "foo" class="x.y.Foo">
<constructor-arg ref= "bar"/>
<constructor-arg ref= "baz"/>
<constructor-arg value= "foo@bar.com"/>
</bean>


<bean id= "foo" class="x.y.Foo" c:bar-ref= "bar" c:baz-ref= "baz" c:email= "foo@bar.com"/>

<bean id="foo" class="x.y.Foo" c:_0-ref= "bar" c:_1-ref= "baz"/>

</beans>

---depend-on bean初始化前，被依赖的bean 先初始化。
<bean id="beanOne" class="ExampleBean" depends-on="manager,accountDao">
<property name="manager" ref="manager" />
</bean>

<bean id="manager" class="ManagerBean" />
<bean id="accountDao" class="x.y.jdbc.JdbcAccountDao" />

---懒加载（容器启动时候，不愿意生成实例）

bean 级别
<bean id="lazy" class="com.foo.ExpensiveToCreateBean" lazy-init="true"/>
<bean name="not.lazy" class="com.foo.AnotherBean"/>
容器级别
<beans default-lazy-init="true">

</beans>

自动装配
byName byType no constructor

autowire-candidate false

-------------lookup method


<bean id="command" class="fiona.apple.AsyncCommand" scope="prototype">

</bean>


<bean id="commandManager" class="fiona.apple.CommandManager">
<lookup-method name="createCommand" bean="command"/>
</bean>

-----repace

<bean id="myValueCalculator" class="x.y.z.MyValueCalculator">

<replaced-method name="computeValue" replacer="replacementComputeValue">
<arg-type>String</arg-type>
</replaced-method>
</bean>

<bean id="replacementComputeValue" class="a.b.c.ReplacementComputeValue"/>

spring2,布布扣,bubuko.com

spring2

标签：spring

原文地址：http://blog.csdn.net/xiaoliuliu2050/article/details/32188213

踩

(0)

评论一句话评论（0）

分享档案

更多>

2021年07月29日 (22)
2021年07月28日 (40)
2021年07月27日 (32)
2021年07月26日 (79)
2021年07月23日 (29)
2021年07月22日 (30)
2021年07月21日 (42)
2021年07月20日 (16)
2021年07月19日 (90)
2021年07月16日 (35)

周排行