java Simple implementation of dynamically loading classes using java reflection mechanism

////////////////// Load.java
 
package org.bromon.reflect;
 
import java.util.ArrayList;
import java.util.List;
 
public class Load implements Operator {
 
 @Override
 public List<?> act(List<?> params) {
 // TODO Auto-generated method stub
 List<String> result=new ArrayList<String>();
 result.add(new String("加载成功"));
 return result;
 }
 
}
 
/////////////////// Operator.java
 
package org.bromon.reflect;
import java.util.*;
 
public interface Operator {
 public List<?> act(List<?> params);
}
 
 
/////////////Store.java
 
package org.bromon.reflect;
 
import java.util.ArrayList;
import java.util.List;
 
 
public class Store implements Operator {
 
 @Override
 public List<?> act(List<?> params) {
 // TODO Auto-generated method stub
 List<String> result=new ArrayList<String>();
 result.add(new String("Store"));
 return result;
 }
 
}
 
///////////////Success.java
 
package org.bromon.reflect;
 
import java.util.List;
import java.util.ArrayList;
 
 
public class Success implements Operator {
 
 @Override
 public List<?> act(List<?> params) {
 // TODO Auto-generated method stub
 List<String> result=new ArrayList<String>();
 result.add(new String("操作成功"));
 return result;
 }
}
 
 
////////////////////////TestReflect.java
 
package org.bromon.reflect;
 
import java.io.FileInputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Properties;
import java.util.List;
 
public class TestReflect {
 private String loadProtocal(String header) {
 String result = null;
 try {
  Properties prop = new Properties();
  FileInputStream fis = new FileInputStream("emp.properties");
  prop.load(fis);
  result = prop.getProperty(header);
  fis.close();
 } catch (Exception e) {
  System.out.println(e);
 }
 return result;
 }
 
 // 针对消息作出响应,利用反射导入对应的类
 public String response(String header, String content) {
 String result = null;
 String s = null;
 try {
  /*
  * 导入属性文件emp.properties,查询header所对应
  *
  * 的类的名字 通过反射机制动态加载匹配的类,所有的类都
  *
  * 被Operator接口隔离 可以通过修改属性文件、添加新的类(继
  *
  * 承MsgOperator接口)来扩展协议
  */
  s = "org.bromon.reflect." + this.loadProtocal(header);
  // 加载类
  Class<?> c = Class.forName(s);
  // 创建类的事例
  Operator mo = (Operator) c.newInstance();
   
  // 构造参数列表
  Class<?> params[] = new Class[1];
  params[0] = Class.forName("java.util.List");
   
  // 查询act方法
  Method m = c.getMethod("act", params);
  List<String> args = new ArrayList<String>();
  args.add(content);
   
  // 调用方法并且获得返回
  Object returnObject = m.invoke(mo, args);
  List<?> list=(List<?>)returnObject;
  System.out.println(list.get(0));
 } catch (Exception e) {
  System.out.println("Handler-response:" + e);
 }
 return result;
 }
 public static void main(String args[]) {
 TestReflect tr = new TestReflect();
 tr.response("2000", "消息内容");
 }
}