设计模式之责任链模式_动力节点Java学院整理

public void test(int i, Request request){ 
 if(i==1){ 
 Handler1.response(request); 
 }else if(i == 2){ 
 Handler2.response(request); 
 }else if(i == 3){ 
 Handler3.response(request); 
 }else if(i == 4){ 
 Handler4.response(request); 
 }else{ 
 Handler5.response(request); 
 } 
} 

class Level { 
 private int level = 0; 
 public Level(int level){ 
 this.level = level; 
 }; 
 
 public boolean above(Level level){ 
 if(this.level >= level.level){ 
  return true; 
 } 
 return false; 
 } 
} 
 
class Request { 
 Level level; 
 public Request(Level level){ 
 this.level = level; 
 } 
 
 public Level getLevel(){ 
 return level; 
 } 
} 
 
class Response { 
 
} 

abstract class Handler { 
 private Handler nextHandler; 
 public final Response handleRequest(Request request){ 
 Response response = null; 
  
 if(this.getHandlerLevel().above(request.getLevel())){ 
  response = this.response(request); 
 }else{ 
  if(this.nextHandler != null){ 
  this.nextHandler.handleRequest(request); 
  }else{ 
  System.out.println("-----没有合适的处理器-----"); 
  } 
 } 
 return response; 
 } 
 public void setNextHandler(Handler handler){ 
 this.nextHandler = handler; 
 } 
 protected abstract Level getHandlerLevel(); 
 public abstract Response response(Request request); 
} 
 
class ConcreteHandler1 extends Handler { 
 protected Level getHandlerLevel() { 
 return new Level(1); 
 } 
 public Response response(Request request) { 
 System.out.println("-----请求由处理器1进行处理-----"); 
 return null; 
 } 
} 
 
class ConcreteHandler2 extends Handler { 
 protected Level getHandlerLevel() { 
 return new Level(3); 
 } 
 public Response response(Request request) { 
 System.out.println("-----请求由处理器2进行处理-----"); 
 return null; 
 } 
} 
 
class ConcreteHandler3 extends Handler { 
 protected Level getHandlerLevel() { 
 return new Level(5); 
 } 
 public Response response(Request request) { 
 System.out.println("-----请求由处理器3进行处理-----"); 
 return null; 
 } 
} 
 
public class Client { 
 public static void main(String[] args){ 
 Handler handler1 = new ConcreteHandler1(); 
 Handler handler2 = new ConcreteHandler2(); 
 Handler handler3 = new ConcreteHandler3(); 
 
 handler1.setNextHandler(handler2); 
 handler2.setNextHandler(handler3); 
  
 Response response = handler1.handleRequest(new Request(new Level(4))); 
 } 
}