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

唐伯虎

用springcontextutil实现applicationcontextaware

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());
 }
}

工具类

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);
  }
}

在spring的配置文件中配置这个类，spring容器会在加载完spring容器后把上下文对象调用这个对象中的setapplicationcontext方法

<!--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>

spring配置文件注入bean类

<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>

总结
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