使用kaptcha生產純數字驗證碼
使用kaptcha生產純數字驗證碼錄
1引入依賴
<dependency>
<groupId>com.github.axet</groupId>
<artifactId>kaptcha</artifactId>
<version>0.0.9</version>
</dependency>
2編寫容器配置類
package com.hengquanrui.controller;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.servlet.ModelAndView;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@Controller
@RequestMapping("/kaptcha")
public class CaptchaController {
@Autowired
private Producer captchaProducer;
@CrossOrigin
@RequestMapping("getKaptchaImage")
public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
HttpSession session = request.getSession();
response.setDateHeader("Expires", 0);
// Set standard HTTP/1.1 no-cache headers.
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
// Set standard HTTP/1.0 no-cache header.
response.setHeader("Pragma", "no-cache");
// return a jpeg
response.setContentType("image/jpeg");
// create the text for the image
String capText = captchaProducer.createText();
// store the text in the session
session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
// String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
// System.out.println("******************驗證碼是: " + code + “******************”);
// create the image with the text
BufferedImage bi = captchaProducer.createImage(capText);
ServletOutputStream out = response.getOutputStream();
// write the data out
ImageIO.write(bi, "jpg", out);
try {
out.flush();
} finally {
out.close();
}
return null;
}
}
3生產驗證碼工具類
package com.hengquanrui.controller;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
@Controller
@RequestMapping("/kaptcha")
public class CaptchaController {
@Autowired
private Producer captchaProducer;
@Autowired
private static Logger logger = LoggerFactory.getLogger(CaptchaController.class);
@CrossOrigin
@RequestMapping("getImage")
public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
HttpSession session = request.getSession();
response.setDateHeader("Expires", 0);
// Set standard HTTP/1.1 no-cache headers.
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
// Set standard HTTP/1.0 no-cache header.
response.setHeader("Pragma", "no-cache");
// return a jpeg
response.setContentType("image/jpeg");
// create the text for the image
String capText = captchaProducer.createText();
// store the text in the session
session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
// String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
// System.out.println("******************驗證碼是: " + code + “******************”);
// create the image with the text
BufferedImage bi = captchaProducer.createImage(capText);
ServletOutputStream out = response.getOutputStream();
// write the data out
ImageIO.write(bi, "jpg", out);
try {
out.flush();
} finally {
out.close();
}
return null;
}
}
4控制層邏輯
@RequestMapping(value = "/login", method = RequestMethod.POST)
@ResponseBody
public Map loginVerification(HttpServletRequest request, String username, String password, @RequestParam("code")String code){
HashMap<String, Object> map = new HashMap<>();
String sessionCode = (String)request.getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY);
System.out.println(" session中獲取的驗證碼: " + sessionCode);
if (!code.equalsIgnoreCase(sessionCode)){
map.put("code",404);
map.put("msg","驗證碼錯誤!");
return map;
}
//1.獲取Subject
Subject user = SecurityUtils.getSubject();
//2.封裝使用者資訊
UsernamePasswordToken token = new UsernamePasswordToken(username, password);
//3.執行登入方法
try {
user.login(token);
map.put("code",200);
map.put("msg","登陸成功!");
return map;
} catch (AuthenticationException e) {
e.printStackTrace();
}
map.put("code",404);
map.put("msg","登陸失敗!");
return map;
}
5登陸頁面設定
前端核心程式碼
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<div class="form-group">
<input type="text" class="form-control" name="code" placeholder="驗證碼" required="">
<span class="p-new-code l-mar-r15"> <img src="http://127.0.0.1:8081/kaptcha/getImage" class="reloadImage" id="reloadImage"
width="121" height="40"/> </span>
<a href="javaScript:;" class="l-color9 reloadImage">看不清楚，換一張</a>
</div>
6 訪問你的登入介面測試
注意問題：1，以上如出現圖片載入不出來，可以嘗試把生成圖片介面訪問許可權放開。
2，如果涉及到跨域問題，可以把127.0.0.1改成localhost。
3，可以在properties.setProperty(…)，設定純數字驗證碼，或者文字驗證碼。