Spring Boot Shiro权限管理--自定义 FormAuthenticationFilter验证码整合

思路
shiro使用FormAuthenticationFilter进行表单认证，验证校验的功能应该加在FormAuthenticationFilter中，在认证之前进行验证码校验。

需要写FormAuthenticationFilter的子类，继承FormAuthenticationFilter，改写它的认证方法，在认证之前进行验证码校验。

自定义FormAuthenticationFilter

package com.example.config.shiro;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.shiro.web.filter.authc.FormAuthenticationFilter;

public class CustomFormAuthenticationFilter extends FormAuthenticationFilter{
    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
        // 在这里进行验证码的校验
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpSession session = httpServletRequest.getSession();  

        // 取出验证码
        String validateCode = (String) session.getAttribute("validateCode");
        // 取出页面的验证码
        // 输入的验证和session中的验证进行对比
        String randomcode = httpServletRequest.getParameter("randomcode");
        if (randomcode != null && validateCode != null && !randomcode.equals(validateCode)) {
            // 如果校验失败，将验证码错误失败信息，通过shiroLoginFailure设置到request中
            httpServletRequest.setAttribute("shiroLoginFailure", "kaptchaValidateFailed");//自定义登录异常
            // 拒绝访问，不再校验账号和密码
            return true;
        }
        return super.onAccessDenied(request, response);
    }
}

在ShiroConfiguration.java中的shiroFilter方法注入自定义FormAuthenticationFilter

@Bean
    public ShiroFilterFactoryBean shiroFilter(SecurityManager securityManager) {
        System.out.println("ShiroConfiguration.shiroFilter()");
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();

        Map<String, Filter> filters = shiroFilterFactoryBean.getFilters();//获取filters
        filters.put("authc", new CustomFormAuthenticationFilter());//将自定义 的FormAuthenticationFilter注入shiroFilter中
        // 必须设置SecuritManager
        shiroFilterFactoryBean.setSecurityManager(securityManager);

        // 拦截器
        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<String, String>();

        // 配置退出过滤器,其中的具体代码Shiro已经替我们实现了
        filterChainDefinitionMap.put("/logout", "logout");
        //验证码可以匿名访问
        filterChainDefinitionMap.put("/validatecodeServlet", "anon");

        //配置记住我或认证通过可以访问的地址

        filterChainDefinitionMap.put("/index", "user");
        filterChainDefinitionMap.put("/", "user");

        // <!-- 过滤链定义，从上向下顺序执行，一般将 /**放在最为下边 -->:这是一个坑呢，一不小心代码就不好使了;
        // <!-- authc:所有url都必须认证通过才可以访问; anon:所有url都都可以匿名访问-->

        filterChainDefinitionMap.put("/**", "authc");

        // 如果不设置默认会自动寻找Web工程根目录下的"/login.jsp"页面
        shiroFilterFactoryBean.setLoginUrl("/login");
        // 登录成功后要跳转的链接
        shiroFilterFactoryBean.setSuccessUrl("/index");
        // 未授权界面;
        shiroFilterFactoryBean.setUnauthorizedUrl("/403");

        shiroFilterFactoryBean
                .setFilterChainDefinitionMap(filterChainDefinitionMap);
        return shiroFilterFactoryBean;

    }

ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();

Map<String, Filter> filters = shiroFilterFactoryBean.getFilters();//获取filters
filters.put("authc", new CustomFormAuthenticationFilter());//将自定义 的FormAuthenticationFilter注入shiroFilter中

登录方法加入自定义的异常kaptchaValidateFailed

@RequestMapping(value = "/login", method = RequestMethod.POST)
    public String login(HttpServletRequest request, Map<String, Object> map) {
        System.out.println("HomeController.login");
        // 登录失败从request中获取shiro处理的异常信息
        // shiroLoginFailure:就是shiro异常类的全类名
        String exception = (String) request.getAttribute("shiroLoginFailure");
        String msg = "";
        if (exception != null) {
            if (UnknownAccountException.class.getName().equals(exception)) {
                System.out.println("UnknownAccountException -->帐号不存在：");
                msg = "UnknownAccountException -->帐号不存在：";
            } else if (IncorrectCredentialsException.class.getName().equals(exception)) {
                System.out.println("IncorrectCredentialsException -- > 密码不正确：");
                msg = "IncorrectCredentialsException -- > 密码不正确：";
            } else if ("kaptchaValidateFailed".equals(exception)) {
                System.out.println("kaptchaValidateFailed -- > 验证码错误");
                msg = "kaptchaValidateFailed -- > 验证码错误";
            } else {
                msg = "else >> " + exception;
                System.out.println("else -- >" + exception);
            }
        }
        map.put("msg", msg);
        // 此方法不处理登录成功,由shiro进行处理.
        return "/login";
    }  

login.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
</head>
<body>
            错误信息：<h4 th:text="${msg}"></h4>
       <form action="" method="post">
           <p>账号：<input type="text" name="username" value="admin"/></p>
           <p>密码：<input type="text" name="password" value="123456"/></p>
           <p>验证码：<input type="text" name="randomcode"/>
           <img th:src="@{/validatecodeServlet}" height="20px" width="60px" onclick="random(this)"/></p>
           <P><input type="checkbox" name="rememberMe" />记住我</P>
           <p><input type="submit" value="登录"/></p>
       </form>
       <script th:inline="javascript">
          function random(tmp){
               tmp.src="/validatecodeServlet?rnd="+Math.random();
          }
       </script>
</body>
</html> 

验证码Servlet

package com.example.servlet;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet(urlPatterns="/validatecodeServlet")
public class ValidatecodeServlet extends HttpServlet{
     /**
     *
     */
    private static final long serialVersionUID = 1L;

    @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.println(">>>>>>>>>>doGet()<<<<<<<<<<<");
            doPost(req, resp);
        }  

        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.println(">>>>>>>>>>doPost()<<<<<<<<<<<");
            int width = 60;
            int height = 32;
            //create the image
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = image.getGraphics();
            // set the background color
            g.setColor(new Color(0xDCDCDC));
            g.fillRect(0, 0, width, height);
            // draw the border
            g.setColor(Color.black);
            g.drawRect(0, 0, width - 1, height - 1);
            // create a random instance to generate the codes
            Random rdm = new Random();
            String hash1 = Integer.toHexString(rdm.nextInt());
            System.out.print(hash1);
            // make some confusion
            for (int i = 0; i < 50; i++) {
                int x = rdm.nextInt(width);
                int y = rdm.nextInt(height);
                g.drawOval(x, y, 0, 0);
            }
            // generate a random code
            String capstr = hash1.substring(0, 4);
            HttpSession session = req.getSession(true);
            //将生成的验证码存入session
            session.setAttribute("validateCode", capstr);
            g.setColor(new Color(0, 100, 0));
            g.setFont(new Font("Candara", Font.BOLD, 24));
            g.drawString(capstr, 8, 24);
            g.dispose();
            //输出图片
            resp.setContentType("image/jpeg");
            OutputStream strm = resp.getOutputStream();
            ImageIO.write(image, "jpeg", strm);
            strm.close();   

        }
}

Application.java

package com.example;  

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@ServletComponentScan
@SpringBootApplication
public class Application {
     public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}