Spring v3.0.2 Learning Note 6 - Inject Components

注入依赖对象

基本类型对象注入：

<bean id="myId" class="xxx">

<constructor-arg index="0" type="java.lang.String" value="aaa"/> //构造器注入

<porperty name="name" value="test"/> // 属性setter方式注入

</bean>

Ref

<bean id="personDao" class="com.spring.test.dao.PersonDao"/>

<bean id="personManager" class="com.spring.test.manager.PersonManager">

<property name="personDao" ref="personDao"/>

</bean>

使用内部bean
,但该bean不能被其他bean使用

<bean id="personManager" class="com.spring.test.manager.PersonManager">

<property name="personDao">

<bean class="com.spring.test.dao.PersonDao"/>

</property>

</bean>

spring还提供了其他注入方式，比如基于接口的注入等，详见参考手册。

集合类型的注入

public class PersonManager {

Set<String> sets = new HashSet<String>();

List<String> lists = new ArrayList<String>();

Properties properties = new Properties();

Map<String,String> maps = new HashMap<String,String>();

// 省略setter方法，对于spring的组件注入，对应的setter方法是必须的
！

}

注入Set

<bean id="personService" class="com.spring.test.manager.impl.PersonManager">

<property name="sets"> // name是类中的属性名

<set>

<value>AAA</value>

<value>BBB</value>

<value>CCC</value>

</set>

</property>

</bean>

测试类：

package com.spring.test.junit;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.spring.test.manager.IPersonService;

public class PersonServiceTest {

@BeforeClass

public static void setUpBeforeClass() throws Exception {

}

@AfterClass

public static void tearDownAfterClass() throws Exception {

}

@Test

public void test() {

AbstractApplicationContext ctx = new ClassPathXmlApplicationContext(

"spring.xml");

IPersonService personService = (IPersonService) ctx

.getBean("personService");

for (String value : personService.getSets()) {

System.out.println(value);

}

}

}

运行该测试类，可在控制台看到Set的内容。

注入List

<property name="lists"> // name是类中的属性名

<list>

<value>AAA</value>

<value>BBB</value>

<value>CCC</value>

</list>

</property>

注入Properties

<bean id="personService" class="com.spring.test.manager.impl.PersonManager">

<property name="properties">

<props>

<prop key="key1">value1</prop>

<prop key="key2">value2</prop>

<prop key="key3">value3</prop>

</props>

</property>

</bean>

测试类：

package com.spring.test.junit;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.spring.test.manager.IPersonService;

public class PersonServiceTest {

@BeforeClass

public static void setUpBeforeClass() throws Exception {

}

@AfterClass

public static void tearDownAfterClass() throws Exception {

}

@Test

public void test() {

AbstractApplicationContext ctx = new ClassPathXmlApplicationContext(

"spring.xml");

IPersonService personService = (IPersonService) ctx

.getBean("personService");

for (Object key : personService.getProperties().keySet()) {

System.out.println(personService.getProperties().getProperty(

(String) key));

}

}

}

运行该测试类，可在控制台看到注入的内容。

注入Map

<property name="maps">

<map>

<entry key="key1" value="value1"/>

<entry key="key2" value="value2"/>

<entry key="key3" value="value3"/>

</map>

</property>