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Spring入门篇 学习笔记

1. No: (默认)不做任何操作
2. byName: 根据属性名自动装配。此选项将检查容器并根据名字查找与属性完全一致的 bean，并将其与属性自动装配
3. byType: 如果容器中存在一个与指定属性类型相同的 bean，那么将与该属性自动装配；如果存在多个该类型的 bean，那么抛出异常，并指出不能使用 byType 方式进行自动装配；如果没有找到相匹配的 bean，则什么事都不发生
4. constructor: 与 byType 方式类似，不同之处在于它应用于构造器参数。如果容器中没有找到与构造器参数类型一致的 bean 则抛出异常

准备工作，添加 AutoWiringDAO：

public class AutoWiringDAO {public void say(String word) {System.out.println("AutoWiringDAO : " + word);}}

byName

添加 AutoWiringServiceByName：

public class AutoWiringServiceByName {private AutoWiringDAO autoWiringDAO;public void setAutoWiringDAO(AutoWiringDAO autoWiringDAO) {this.autoWiringDAO = autoWiringDAO;}public void say(String word) {this.autoWiringDAO.say(word);}}

添加配置文件 spring-autowiring-byname.xml：

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd" default-autowire="byName"><bean id="autoWiringService" class="com.karonda.autowiring.AutoWiringServiceByName" ></bean><bean id="autoWiringDAO" class="com.karonda.autowiring.AutoWiringDAO" ></bean></beans>

添加测试类：

@RunWith(BlockJUnit4ClassRunner.class)
public class TestAutoWiringByName extends UnitTestBase {public TestAutoWiringByName() {super("classpath:spring-autowiring-byname.xml");}@Testpublic void testSay() {AutoWiringServiceByName service = super.getBean("autoWiringService");service.say(" this is a test");}}

byType

添加 AutoWiringServiceByType：

public class AutoWiringServiceByType {private AutoWiringDAO autoWiringDAO;public void setAutoWiringDAO(AutoWiringDAO autoWiringDAO) {this.autoWiringDAO = autoWiringDAO;}public void say(String word) {this.autoWiringDAO.say(word);}}

添加配置文件 spring-autowiring-bytype.xml：

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd" default-autowire="byType"><bean id="autoWiringService" class="com.karonda.autowiring.AutoWiringServiceByType" ></bean><bean class="com.karonda.autowiring.AutoWiringDAO" ></bean></beans>

添加测试类：

@RunWith(BlockJUnit4ClassRunner.class)
public class TestAutoWiringByType extends UnitTestBase {public TestAutoWiringByType() {super("classpath:spring-autowiring-bytype.xml");}@Testpublic void testSay() {AutoWiringServiceByType service = super.getBean("autoWiringService");service.say(" this is a test");}}

constructor

添加 AutoWiringServiceConstructor

public class AutoWiringServiceConstructor {private AutoWiringDAO autoWiringDAO;public AutoWiringServiceConstructor(AutoWiringDAO autoWiringDAO){this.autoWiringDAO = autoWiringDAO;}public void say(String word) {this.autoWiringDAO.say(word);}}

添加配置文件 spring-autowiring-constructor.xml：

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd" default-autowire="constructor"><bean id="autoWiringService" class="com.karonda.autowiring.AutoWiringServiceConstructor" ></bean><bean class="com.karonda.autowiring.AutoWiringDAO" ></bean></beans>

添加测试类：

@RunWith(BlockJUnit4ClassRunner.class)
public class TestAutoWiringConstructor extends UnitTestBase {public TestAutoWiringConstructor() {super("classpath:spring-autowiring-constructor.xml");}@Testpublic void testSay() {AutoWiringServiceConstructor service = super.getBean("autoWiringService");service.say(" this is a test");}}

源码：learning-spring