谷歌验证码框架kaptcha如何应用于长尾词识别？

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Web 文件 index.jsp 中配置 Kaptcha 验证码 Servlet，设置边框为无，字体颜色为红色，图片宽度为 135，字符集包括 ACDEFHKPRSTWX345679，图片高度为 50。

web 文件

index.jsp Kaptcha com.google.code.kaptcha.servlet.KaptchaServlet

kaptcha.border

no

kaptcha.textproducer.font.color

red

kaptcha.image.width

135

kaptcha.textproducer.char.string

ACDEFHKPRSTWX345679

kaptcha.image.height

50

kaptcha.textproducer.font.size

43

kaptcha.noise.color

black

kaptcha.textproducer.char.length

4

kaptcha.textproducer.font.names

Arial Kaptcha /Kaptcha.jpg VerifyServlet me.gacl.web.controller.VerifyServlet VerifyServlet /servlet/VerifyServlet html 界面

<%@ page language="java" pageEncoding="UTF-8"%>

请输入验证码： 看不清，换一张

后台验证

/** * */ package me.gacl.web.controller; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class VerifyServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charaset=utf-8"); response.setHeader("pragma", "no-cache"); response.setHeader("cache-control", "no-cache"); PrintWriter out = null; try { //响应数据 String resultData; //获取传过来的验证码 String verifyCode = request.getParameter("verifyCode"); System.out.println("verifyCode----"+verifyCode); if(verifyCode=="") { resultData = "N"; }else { //获取kaptcha生成存放在session中的验证码 String kaptchaValue = (String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY); //比较输入的验证码和实际生成的验证码是否相同 if(kaptchaValue == null || kaptchaValue == ""||!verifyCode.equalsIgnoreCase(kaptchaValue)) { resultData = "N"; }else { resultData = "Y"; } } out = response.getWriter(); out.write(resultData); out.flush(); }catch(Exception e) { e.printStackTrace(); }finally { if(out != null) { out.close(); } } } }