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>
原创不易，转载请注明出处：java利用反射机制模拟spring IOC实现
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");
}
}