java通过服务名动态实例化对象并调用指定方法
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.xainfor.service.UserService " template = " normal " />
< service name = " GnmkService " class = " com.xainfor.service.GnmkService " template = " normal " />
</ service - config >
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

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
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
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");
}

}public class UserService implements Service {

public void execute() {
// TODO Auto-generated method stub
System.out.println("执行的是UserService");

}
}第六步:测试类
public class testService {

public static void main(String [] temp) {
ServiceExecuteHelper.execute("UserService");
}
}