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public abstract class Handler

{

protected Handler successor;

public void setSuccessor(Handler successor)

{

this.successor=successor;

}

public abstract void handleRequest(String request);

}

public class ConcreteHandler extends Handler

{

public void handleRequest(String request)

{

if(请求request满足条件)

{

...... //处理请求；

}

else

{

this.successor.handleRequest(request); //转发请求

}

}

}