java 利用java反射机制动态加载类的简单实现

如下所示：

////////////////// 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 result=new ArrayList();
 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 result=new ArrayList();
 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 result=new ArrayList();
 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 {
  
  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 args = new ArrayList();
  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");
 }
}

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