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Spring中依赖注入的使用和配置
使用方法1：
//在执行此实例化的时候就会完成所有注入
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
UserService service = (UserService)ctx.getBean("userService");
使用方法2：
public class SocketRequest {
/**
* 默认实例
*/
private static final SocketRequest INSTANCE = new SocketRequest();
/**
* 获取默认实例
*
* @return 默认实例
*/
public static SocketRequest get() {
return INSTANCE;
}
/**
* 处理系统控制器操作方法
*
* @param context
* spring上下文
*/
public void methodHolder(ApplicationContext context) {
String[] beans = context.getBeanDefinitionNames();//通过此方法可以获得所有的注入类
}
}
public class GameServer implements ApplicationContextAware{ @Override public void setApplicationContext(ApplicationContext arg0) throws BeansException { SocketRequest.get().methodHolder(arg0); }}
public class mainServer { public static void main(String[] args) {
//在执行此实例化的时候就会完成所有注入，同时会调用GameServer的setApplicationContext方法
GameServer server = new ClassPathXmlApplicationContext("server.xml").getBean(GameServer.class);
}
}
Spring配置
1.属性中引用另外的bean
<?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-2.5.xsd"> <!-- IoC控制反转 --> <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl"> </bean> <!-- 属性中引用另外的bean--> <bean id="userService" class="com.bjsxt.service.UserService"> <property name="userDAO" ref="u" /> </bean></beans>
2.有构造函数的注入
<?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-2.5.xsd"> <!-- IoC控制反转 --> <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl"> </bean> <bean id="userService" class="com.bjsxt.service.UserService"> <!-- 有构造函数的注入 --> <constructor-arg> <ref bean="u" /> </constructor-arg> </bean></beans>
3.有属性的注入,直接把属性写入，很少用到
<?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-2.5.xsd"> <!-- IoC控制反转 --> <bean name="u" class="com.bjsxt.dao.impl.UserDAOImpl"> <!-- 有属性的注入,直接把属性写入，很少用到 --> <property name="daoId" value="123"></property> <property name="daoStatus" value="DDD"></property> </bean> <!-- 可以写id也可以写name(如果是name则可以写特殊字符) --> <bean id="userService" class="com.bjsxt.service.UserService"> <constructor-arg> <ref bean="u" /> </constructor-arg> </bean></beans>
4.scope范围，默认是singleton即单例，如果是prototype则每次是新实例
<?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-2.5.xsd"> <!-- IoC控制反转 --> <bean name="u" class="com.bjsxt.dao.impl.UserDAOImpl"> <property name="daoId" value="123"></property> <property name="daoStatus" value="DDD"></property> </bean> <!-- scope范围，默认是singleton即单例，如果是prototype则每次是新实例 --> <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype"> <constructor-arg> <ref bean="u" /> </constructor-arg> </bean></beans>
5.可以注入集合类型
<?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-2.5.xsd"> <!-- IoC控制反转 --> <bean name="u" class="com.bjsxt.dao.impl.UserDAOImpl"> <!-- 可以注入集合类型 --> <property name="sets"> <set> <value>1</value> <value>2</value> </set> </property> <property name="lists"> <list> <value>1</value> <value>2</value> <value>3</value> </list> </property> <property name="maps"> <map> <entry key="1" value="1"></entry> <entry key="2" value="2"></entry> <entry key="3" value="3"></entry> <entry key="4" value="4"></entry> </map> </property> </bean> <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype"> <constructor-arg> <ref bean="u" /> </constructor-arg> </bean></beans>
6.自动装配
<?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-2.5.xsd"> <!-- IoC控制反转 --> <bean name="userDAO" class="com.bjsxt.dao.impl.UserDAOImpl"> <property name="name" value="myname"></property> </bean> <!-- 自动装配(用的不多)： byName按名称自动匹配（即要装配的bean中的属性名称和配置中的bean名称相同就会自动装配，如UserService类中的属性和userDAO的bean名称相同就自动装配） byType按类型自动匹配 （即要装配的bean中的属性类型和配置中的bean的类型相同就会自动装配，如UserService类中的属性类型和userDAO的bean类型相同就自动装配） --> <bean id="userService" class="com.bjsxt.service.UserService" autowire="default"> </bean></beans>
7.初始化bean时执行init-method方法和销毁的时候执行destroy-method方法
<?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-2.5.xsd" default-autowire="byName" > <!-- IoC控制反转 --> <bean name="userDAO" class="com.bjsxt.dao.impl.UserDAOImpl"> <property name="name" value="myname"></property> </bean> <!-- 初始化bean时执行init-method方法和销毁的时候执行destroy-method方法 --> <bean id="userService" class="com.bjsxt.service.UserService" init-method="init" destroy-method="destroy"> </bean></beans>
8.使用注解
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:annotation-config></context:annotation-config></beans>
9.扫描包名，包名下的类都可以注入。
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:component-scan base-package="com.bjsxt"></context:component-scan></beans>
10.实际项目配置参考
<?xml version="1.0" encoding="UTF-8"?><beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jdbc="http://www.eelpo.com/schema/jdbc" xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.eelpo.com/schema/jdbc http://www.eelpo.com/schema/jdbc/jdbc.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:property-placeholder location="classpath:system.properties" /> <context:component-scan base-package="com.egaplay.foi.controller" /> <context:component-scan base-package="com.egaplay.foi.core.listener" /> <context:component-scan base-package="com.egaplay.foi.tools.controller" /> <context:component-scan base-package="com.egaplay.foi.module.*.service" /> <context:component-scan base-package="com.egaplay.foi.module" resource-pattern="Context.class" /> <jdbc:repositories base-package="com.egaplay.foi.module.*.dao"></jdbc:repositories> <bean class="com.eelpo.framework.socket.server.GameServer"> <property name="port" value="http://www.mamicode.com/${port}" /> <property name="shutdownPort" value="http://www.mamicode.com/${shutdownPort}" /> <property name="crossDomainPort" value="http://www.mamicode.com/${crossDomainPort}" /> <property name="startCrossDomainServer" value="http://www.mamicode.com/${startCrossDomainServer}" /> <property name="shutdownCommand" value="http://www.mamicode.com/${shutdownCommand}" /> <property name="executionHandler" ref="executionHandler" /> <property name="socketIdleStateHandler" ref="socketIdleStateHandler" /> <property name="gameServerListener" ref="foiServerListener" /> <property name="socketIdleListener" ref="foiSocketIdleListener" /> <property name="socketSessionListener" ref="foiSocketSessionListener" /> <property name="socketContextListener" ref="foiSocketContextListener" /> <property name="socketRequestListener" ref="foiSocketRequestListener" /> </bean> <bean id="executionHandler" class="org.jboss.netty.handler.execution.ExecutionHandler"> <constructor-arg index="0"> <bean class="org.jboss.netty.handler.execution.OrderedMemoryAwareThreadPoolExecutor"> <constructor-arg index="0" value="http://www.mamicode.com/${threadPool.corePoolSize}" type="int" /> <constructor-arg index="1" value="http://www.mamicode.com/${threadPool.maxChannelMemorySize}" type="long" /> <constructor-arg index="2" value="http://www.mamicode.com/${threadPool.maxTotalMemorySize}" type="long" /> <constructor-arg index="3" value="http://www.mamicode.com/${threadPool.keepAliveTime}" type="long" /> <constructor-arg index="4" value="http://www.mamicode.com/SECONDS" type="java.util.concurrent.TimeUnit" /> <constructor-arg index="5"> <bean class="com.eelpo.framework.utils.concurrent.NamedThreadFactory"> <constructor-arg index="0" value="http://www.mamicode.com/Business Process #" /> </bean> </constructor-arg> </bean> </constructor-arg> </bean> <bean id="socketIdleStateHandler" class="com.eelpo.framework.socket.server.handler.SocketIdleStateHandler"> <constructor-arg index="0" ref="foiSocketIdleListener" /> <constructor-arg index="1"> <bean class="org.jboss.netty.util.HashedWheelTimer"> <constructor-arg index="0" value="http://www.mamicode.com/${wheelTimer.tickDuration}" type="long" /> <constructor-arg index="1" value="http://www.mamicode.com/SECONDS" type="java.util.concurrent.TimeUnit" /> <constructor-arg index="2" value="http://www.mamicode.com/${wheelTimer.ticksPerWheel}" type="int" /> </bean> </constructor-arg> <constructor-arg index="2" value="http://www.mamicode.com/${socketIdle.readerIdleTimeSeconds}" type="int" /> <constructor-arg index="3" value="http://www.mamicode.com/${socketIdle.writerIdleTimeSeconds}" type="int" /> <constructor-arg index="4" value="http://www.mamicode.com/${socketIdle.allIdleTimeSeconds}" type="int" /> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="username" value="http://www.mamicode.com/${jdbc.username}" /> <property name="password" value="http://www.mamicode.com/${jdbc.password}" /> <property name="url" value="http://www.mamicode.com/${jdbc.url}" /> <property name="driverClassName" value="http://www.mamicode.com/${jdbc.driverClassName}" /> <property name="connectionProperties" value="http://www.mamicode.com/${jdbc.connectionProperties}" /> <property name="defaultAutoCommit" value="http://www.mamicode.com/${dbcp.defaultAutoCommit}" /> <property name="defaultCatalog" value="http://www.mamicode.com/${dbcp.defaultCatalog}" /> <property name="initialSize" value="http://www.mamicode.com/${dbcp.initialSize}" /> <property name="maxActive" value="http://www.mamicode.com/${dbcp.maxActive}" /> <property name="maxIdle" value="http://www.mamicode.com/${dbcp.maxIdle}" /> <property name="minIdle" value="http://www.mamicode.com/${dbcp.minIdle}" /> <property name="maxWait" value="http://www.mamicode.com/${dbcp.maxWait}" /> <property name="timeBetweenEvictionRunsMillis" value="http://www.mamicode.com/${dbcp.timeBetweenEvictionRunsMillis}" /> <property name="numTestsPerEvictionRun" value="http://www.mamicode.com/${dbcp.numTestsPerEvictionRun}" /> <property name="minEvictableIdleTimeMillis" value="http://www.mamicode.com/${dbcp.minEvictableIdleTimeMillis}" /> <property name="poolPreparedStatements" value="http://www.mamicode.com/${dbcp.poolPreparedStatements}" /> <property name="maxOpenPreparedStatements" value="http://www.mamicode.com/${dbcp.maxOpenPreparedStatements}" /> <property name="accessToUnderlyingConnectionAllowed" value="http://www.mamicode.com/${dbcp.accessToUnderlyingConnectionAllowed}" /> <property name="removeAbandoned" value="http://www.mamicode.com/${dbcp.removeAbandoned}" /> <property name="removeAbandonedTimeout" value="http://www.mamicode.com/${dbcp.removeAbandonedTimeout}" /> <property name="logAbandoned" value="http://www.mamicode.com/${dbcp.logAbandoned}" /> </bean></beans>
Spring中依赖注入的使用和配置
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