java利用反射机制模拟spring IOC实现

第一步:定义服务的配置文件(指定服务名和服务路径)

<?xml version="1.0" encoding="gb2312" ?> 
 <!-- DOCTYPE service - config SYSTEM " service.dtd " --> 
 <service - config> 
 <!-- 用户服务 --> 
 <service name="UserService " class="com.zuidaima.service.UserService" template="normal" /> 
 <service name="GnmkService" class="com.zuidaima.service.GnmkService" template= "normal" /> 
 </service - config> 

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代码下载地址：http://www.zuidaima.com/share/1724245276724224.htm

 

第二步:系统初始化是将所有服务名和路径加载到一个静态的HashMap中

package com.zuidaima;
public class ServiceConfig {
 
    public static HashMap serviceMap= new HashMap();
 
    public static String getService(String serviceName) {
    String serviceClass= "";
    serviceClass= ServiceConfig.serviceMap.get(serviceName).toString();
       return serviceClass;
    }  
 }

 第三步:定义一个接口类

 

public interface Service {
 public void execute();
} 

 第四步:服务实例化类

 

 

package com.zuidaima;
public class ServiceExecuteHelper {
 
 /** *//**
 * 日志处理
 */
 private static final MsgLogger logger=MsgLogger.getLogger();
 
 public static void execute(String servicename) {
         try {
             //验证服务是否存在
            String servicClass=ServiceConfig.getService(servicename);
            //如果服务存在就加载服务信息
            if (servicClass !=null && !servicClass.equals("")) {
                 Class classObject=Class.forName(servicClass);
                 Service service=(Service) classObject.newInstance();
                 service.execute(); 
             } else {
                 logger.info("服务["+servicename+"]未定义");
             }
           }catch(Exception e) {
               logger.info("服务["+servicename+"]不存在!");
           }
        }
}

 第五步:定义接具体服务并实现接口类

package com.zuidaima;
public class GnmkService implements Service {

          /**//* (non-Javadoc)
           * @see com.xainfor.service.Service#println()
           */
          public void execute() {
            // TODO Auto-generated method stub
           System.out.println("执行的是GnmkService");
          }

}