spring中通过ApplicationContext getBean获取注入对象的方法实例

package util;import java.util.Locale;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;public class SpringContextUtil implements ApplicationContextAware{ private static ApplicationContext context; @Override public void setApplicationContext(ApplicationContext contex)  throws BeansException {  System.out.println("--------------------contex---------"+contex);  SpringContextUtil.context = contex; } public static ApplicationContext getApplicationContext() {    return context;  }  public static Object getBean(String beanName) {  return context.getBean(beanName); } public static String getMessage(String key) {  return context.getMessage(key, null, Locale.getDefault()); }}

package redis;import redis.clients.jedis.JedisPool;import util.SpringContextUtil;public class RedisUtil { private static JedisPool jedisPool; static{  jedisPool = (JedisPool)SpringContextUtil.getBean("jedisPool");  }  public static JedisPool getJedisPool(){  if(jedisPool == null){   jedisPool = (JedisPool)SpringContextUtil.getBean("jedisPool");   }  return jedisPool;  }  public void flusDB(){  jedisPool.getResource().flushDB();  }  public static String set(String key,String value){  return jedisPool.getResource().set(key, value);  }  public static String get(String key){  return jedisPool.getResource().get(key);  }  public static Long del(String key){  return jedisPool.getResource().del(key);  }}

<!--1 自动扫描 将标注Spring注解的类自动转化Bean-->  <context:component-scan base-package="com.first,com.util" />  <!--2 加载数据资源属性文件 -->  <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">   <property name="locations">   <list>   <value>classpath:jdbc.properties</value>   <value>classpath:redis.properties</value>   </list>  </property> </bean>  <bean id="springContextUtil" class="util.SpringContextUtil"></bean> <import resource="redis-config.xml"/>在web项目中的web.xml中配置加载Spring容器的Listener<!-- 初始化Spring容器，让Spring容器随Web应用的启动而自动启动 --> <listener>  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>

 <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">    <property name="maxIdle" value="300" /> <!-- 最大能够保持idel状态的对象数 -->    <property name="testOnBorrow" value="true" /> <!-- 当调用borrow Object方法时，是否进行有效性检查 -->    <property name="maxActive" value="200" />     <property name="minIdle" value="10"/>      <property name="maxWait" value="300" />      <property name="testOnReturn" value="true" />      <property name="testWhileIdle" value="true" />   </bean>  <bean id="jedisPool" class="redis.clients.jedis.JedisPool">    <constructor-arg name="poolConfig" ref="jedisPoolConfig" />    <constructor-arg name="host" value="${redis_addr}" />    <constructor-arg name="port" value="${redis_port}" type="int" />    <constructor-arg name="timeout" value="${redis_timeout}" type="int" />    <constructor-arg name="password" value="#{'${redis_password}'!=''?'${redis_password}':null}" />    <constructor-arg name="database" value="${redis_db_index}" type="int" />  </bean>