Kaptcha验证码

Kaptcha的使用：

1.在pom.xml中添加依赖，在applicationContext.xml中配置Kaptcha

 

2.在applicationContext.xml中配置Kaptcha

 

 

3.开发KapatchaController生成验证码图片

package com.imooc.reader.controller;

import com.google.code.kaptcha.Producer;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;

@Controller
public class KaptchaController {
    @Resource
    private Producer kaptchaProducer;
    @GetMapping("/verify_code")
    public void createVerifyCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
        //响应立即过期
        response.setDateHeader("Expires",0);
        //不缓存任何图片数据
        response.setHeader("Cache-Control", "no-store,no-cache,must-revalidate");
        response.setHeader("Cache-Control","post-check=0,pre-check=0");
        response.setHeader("Pragma","no-cache");
        response.setContentType("image/png");

        //生成验证码字符文本
        String verifyCode = kaptchaProducer.createText();
        request.getSession().setAttribute("kaptchaVerifyCode",verifyCode);
        System.out.println(request.getSession().getAttribute("kaptchaVerifyCode"));
        //创建验证码图片
        BufferedImage image = kaptchaProducer.createImage(verifyCode);
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(image, "png", out);
        out.flush();
        out.close();
    }
}

4.将生成图片方法绑定的url写入前端页面

 

package com.imooc.reader.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;

@Controller
public class MemberController {
    @GetMapping("/register.html")
    public ModelAndView showRegister() {
        return new ModelAndView("/register");
    }
}

4.将前台输入验证码与session保存的验证码进行比对

package com.imooc.reader.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

@Controller
public class MemberController {
    @GetMapping("/register.html")
    public ModelAndView showRegister() {
        return new ModelAndView("/register");
    }
    
    @PostMapping("/registe")
    @ResponseBody
    public Map registe(String vc, String username, String password, String nickname, HttpServletRequest request){
        //获取验证码
        String verifyCode = (String) request.getSession().getAttribute("kaptchaVerifyCode");
        //验证码比对
        Map result = new HashMap();
        if (vc == null || verifyCode == null || !vc.equals(verifyCode)) {
            result.put("code", "VC01");
            result.put("msg", "验证码错误");
        } else {
            result.put("code", "0");
            result.put("msg", "success");
        }
        return result;
    }
}