Spring IOC (DI) 依赖注入的四种方式示例详解

<bean id="student" class="cust.zaw.entity.Student">
	<property name="stuName" value="lc"></property>
</bean>

<bean id="student" class="cust.zaw.entity.Student">
参数顺序相同的话，可以不写index
<constructor-arg value=""></constructor-arg>
参数顺序不同的话，写index或者name或者type
<constructor-arg value="" index=“0”></constructor-arg>
<constructor-arg value="" index=“1”></constructor-arg>
<constructor-arg value="" name=“”></constructor-arg>
<constructor-arg value="" type=“”></constructor-arg>
</bean>

<bean id="student" class="cust.zaw.entity.Student" p:stuAge="" p:stuName="" p:stuNO-ref="">
</bean>

package cust.zaw.entity;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class AllCollectionType {
	private List<String> list;
	private String[] array;
	private Set<String> set;
	private Map<String,String> map;
	private Properties props;
	public List<String> getList() {
		return list;
	}
	public void setList(List<String> list) {
		this.list = list;
	}
	public String[] getArray() {
		return array;
	}
	public void setArray(String[] array) {
		this.array = array;
	}
	public Set<String> getSet() {
		return set;
	}
	public void setSet(Set<String> set) {
		this.set = set;
	}
	public Map<String, String> getMap() {
		return map;
	}
	public void setMap(Map<String, String> map) {
		this.map = map;
	}
	public Properties getProps() {
		return props;
	}
	public void setProps(Properties props) {
		this.props = props;
	}
	@Override
	public String toString() {
		String strContent=null;
		for(String str : array) {
			strContent +=str + ",";
		}
		return "AllCollectionType [getList()=" + getList() + ", getArray()=" + Arrays.toString(getArray())
				+ ", getSet()=" + getSet() + ", getMap()=" + getMap() + ", getProps()=" + getProps() + "]"+strContent;
	}
}

<bean id="collectionDemo" class="cust.zaw.entity.AllCollectionType">
		<property name="list">
			<list>
				<value>足球</value>
				<value>篮球</value>
				<value>乒乓球</value>
			</list>
		</property>
		<property name="array">
			<array>
				<value>足球1</value>
				<value>篮球1</value>
				<value>乒乓球1</value>
			</array>
		</property>
		<property name="set">
			<set>
				<value>足球2</value>
				<value>篮球2</value>
				<value>乒乓球2</value>
			</set>
		</property>
		<property name="map">
			<map>
				<entry>
					<key>
						<value>football3</value>
					</key>
					<value>足球3</value>
				</entry>
				<entry>
					<key>
						<value>basketball3</value>
					</key>
					<value>篮球3</value>
				</entry>
				<entry>
					<key>
						<value>ppq3</value>
					</key>
					<value>乒乓球3</value>
				</entry>
			</map>
		</property>
		<property name="props">
			<props>
				<prop key="football4">足球4</prop>
				<prop key="baskball4">篮球4</prop>
				<prop key="pp4">乒乓球4</prop>
			</props>
		</property>		
	</bean>

public static void collectionDemp() {
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        AllCollectionType type=(AllCollectionType)context.getBean("collectionDemo");
        System.out.println(type);
    }

<!-- 注意没有<value> -->
<property name="name">
			<null/>
</property>

<property name="name">
			<value></value>
</property>

<!--
		autowire="byName"
		Course类中有一个ref属性teacher（属性名），并且该ioc容器中恰好有一个 bean的id也是teacher
		bean的id=类的属性名 
 -->
<bean id="student" class="cust.zaw.entity.Student" autowire="byName">
		<property name="stuNO" value="2"></property>
		<property name="stuName" value="lc"></property>
		<property name="stuAge" value="24"></property>
		<!-- <property name="teacher" ref="teacher"></property>-->
</bean>

<beans xmlns="http://www.springframework.org/schema/beans"
	....
	default-autowire="byName">