anchor.diff:  <%@page import="org.apdplat.qa.model.CandidateAnswer"%>
   <%@page import="org.apdplat.qa.model.QuestionType"%>
   <%@page import="org.apdplat.qa.SharedQuestionAnsweringSystem"%>
  +<%@page import="org.apdplat.qa.parser.WordParser"%>
   <%@page import="java.util.List"%>
   <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
   <%
  
positive.code:     </head>
      <body>
          <h1><font color="blue">人机问答系统演示 <a href="https://github.com/ysc/QuestionAnsweringSystem" target="_blank">项目主页</a></font></h1>
                  <%
                      if (questionStr == null || questionStr.trim().length() <= 3) {
                  %>      
  
negative.code:         <%
              }
          %>  	
          <br/>
          <h2><a href="<%=request.getContextPath()%>/view.jsp">返回主页</a></h2>
          <h2><a href="history_questions.jsp">其他用户曾经问过的问题</a></h2>
      </body>
  </html>