SpringMVC+Apache Shiro+JPA（hibernate）案例教学（三）给Shiro登录验证加上验证码

序：

给Shiro加入验证码，有多种方式，当然你也可以通过继承修改FormAuthenticationFilter类，通过Shiro去验证验证码。
具体实现请百度： 

应用Shiro到Web Application(验证码实现)

而今天我要说的，既然使用的SpringMVC，为什么不直接在Controller中就处理验证码验证，让事情变的更简单一点呢？

---

一、新建ValidateCode.java验证码工具类 

package org.shiro.demo.util;

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

/**
 * 验证码生成器类，可生成数字、大写、小写字母及三者混合类型的验证码。 支持自定义验证码字符数量； 支持自定义验证码图片的大小； 支持自定义需排除的特殊字符；
 * 支持自定义干扰线的数量； 支持自定义验证码图文颜色
 */
public class ValidateCode {

    /**
     * 验证码类型为仅数字 0~9
     */
    public static final int TYPE_NUM_ONLY = 0;

    /**
     * 验证码类型为仅字母，即大写、小写字母混合
     */
    public static final int TYPE_LETTER_ONLY = 1;

    /**
     * 验证码类型为数字、大写字母、小写字母混合
     */
    public static final int TYPE_ALL_MIXED = 2;

    /**
     * 验证码类型为数字、大写字母混合
     */
    public static final int TYPE_NUM_UPPER = 3;

    /**
     * 验证码类型为数字、小写字母混合
     */
    public static final int TYPE_NUM_LOWER = 4;

    /**
     * 验证码类型为仅大写字母
     */
    public static final int TYPE_UPPER_ONLY = 5;

    /**
     * 验证码类型为仅小写字母
     */
    public static final int TYPE_LOWER_ONLY = 6;

    private ValidateCode() {
        
    }

    /**
     * 生成验证码字符串
     * 
     * @param type
     *            验证码类型，参见本类的静态属性
     * @param length
     *            验证码长度，大于0的整数
     * @param exChars
     *            需排除的特殊字符（仅对数字、字母混合型验证码有效，无需排除则为null）
     * @return 验证码字符串
     */
    public static String generateTextCode(int type, int length, String exChars) {

        if (length <= 0)
            return "";

        StringBuffer code = new StringBuffer();
        int i = 0;
        Random r = new Random();

        switch (type) {

        // 仅数字
        case TYPE_NUM_ONLY:
            while (i < length) {
                int t = r.nextInt(10);
                if (exChars == null || exChars.indexOf(t + "") < 0) {// 排除特殊字符
                    code.append(t);
                    i++;
                }
            }
            break;

        // 仅字母（即大写字母、小写字母混合）
        case TYPE_LETTER_ONLY:
            while (i < length) {
                int t = r.nextInt(123);
                if ((t >= 97 || (t >= 65 && t <= 90)) && (exChars == null || exChars.indexOf((char) t) < 0)) {
                    code.append((char) t);
                    i++;
                }
            }
            break;

        // 数字、大写字母、小写字母混合
        case TYPE_ALL_MIXED:
            while (i < length) {
                int t = r.nextInt(123);
                if ((t >= 97 || (t >= 65 && t <= 90) || (t >= 48 && t <= 57))
                        && (exChars == null || exChars.indexOf((char) t) < 0)) {
                    code.append((char) t);
                    i++;
                }
            }
            break;

        // 数字、大写字母混合
        case TYPE_NUM_UPPER:
            while (i < length) {
                int t = r.nextInt(91);
                if ((t >= 65 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {
                    code.append((char) t);
                    i++;
                }
            }
            break;

        // 数字、小写字母混合
        case TYPE_NUM_LOWER:
            while (i < length) {
                int t = r.nextInt(123);
                if ((t >= 97 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {
                    code.append((char) t);
                    i++;
                }
            }
            break;

        // 仅大写字母
        case TYPE_UPPER_ONLY:
            while (i < length) {
                int t = r.nextInt(91);
                if ((t >= 65) && (exChars == null || exChars.indexOf((char) t) < 0)) {
                    code.append((char) t);
                    i++;
                }
            }
            break;

        // 仅小写字母
        case TYPE_LOWER_ONLY:
            while (i < length) {
                int t = r.nextInt(123);
                if ((t >= 97) && (exChars == null || exChars.indexOf((char) t) < 0)) {
                    code.append((char) t);
                    i++;
                }
            }
            break;

        }

        return code.toString();
    }

    /**
     * 已有验证码，生成验证码图片
     * 
     * @param textCode
     *            文本验证码
     * @param width
     *            图片宽度
     * @param height
     *            图片高度
     * @param interLine
     *            图片中干扰线的条数
     * @param randomLocation
     *            每个字符的高低位置是否随机
     * @param backColor
     *            图片颜色，若为null，则采用随机颜色
     * @param foreColor
     *            字体颜色，若为null，则采用随机颜色
     * @param lineColor
     *            干扰线颜色，若为null，则采用随机颜色
     * @return 图片缓存对象
     */
    public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine,
            boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {

        BufferedImage bim = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = bim.getGraphics();

        // 画背景图
        g.setColor(backColor == null ? getRandomColor() : backColor);
        g.fillRect(0, 0, width, height);

        // 画干扰线
        Random r = new Random();
        if (interLine > 0) {

            int x = 0, y = 0, x1 = width, y1 = 0;
            for (int i = 0; i < interLine; i++) {
                g.setColor(lineColor == null ? getRandomColor() : lineColor);
                y = r.nextInt(height);
                y1 = r.nextInt(height);

                g.drawLine(x, y, x1, y1);
            }
        }

        // 写验证码

        // g.setColor(getRandomColor());
        // g.setColor(isSimpleColor?Color.BLACK:Color.WHITE);

        // 字体大小为图片高度的80%
        int fsize = (int) (height * 0.8);
        int fx = height - fsize;
        int fy = fsize;

        g.setFont(new Font("Default", Font.PLAIN, fsize));

        // 写验证码字符
        for (int i = 0; i < textCode.length(); i++) {
            fy = randomLocation ? (int) ((Math.random() * 0.3 + 0.6) * height) : fy;// 每个字符高低是否随机
            g.setColor(foreColor == null ? getRandomColor() : foreColor);
            g.drawString(textCode.charAt(i) + "", fx, fy);
            fx += fsize * 0.9;
        }

        g.dispose();

        return bim;
    }

    /**
     * 生成图片验证码
     * 
     * @param type
     *            验证码类型，参见本类的静态属性
     * @param length
     *            验证码字符长度，大于0的整数
     * @param exChars
     *            需排除的特殊字符
     * @param width
     *            图片宽度
     * @param height
     *            图片高度
     * @param interLine
     *            图片中干扰线的条数
     * @param randomLocation
     *            每个字符的高低位置是否随机
     * @param backColor
     *            图片颜色，若为null，则采用随机颜色
     * @param foreColor
     *            字体颜色，若为null，则采用随机颜色
     * @param lineColor
     *            干扰线颜色，若为null，则采用随机颜色
     * @return 图片缓存对象
     */
    public static BufferedImage generateImageCode(int type, int length, String exChars, int width, int height,
            int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {

        String textCode = generateTextCode(type, length, exChars);
        BufferedImage bim = generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor,
                lineColor);

        return bim;
    }

    /**
     * 产生随机颜色
     * 
     * @return
     */
    private static Color getRandomColor() {
        Random r = new Random();
        Color c = new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255));
        return c;
    }

}

 

 二、修改UserController.java的实现 

package org.shiro.demo.controller;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.lang.StringUtils;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.util.WebUtils;
import org.shiro.demo.entity.User;
import org.shiro.demo.util.ValidateCode;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class LoginController {
    
    @RequestMapping(value = "/login" ,method=RequestMethod.POST,produces={"application/json;charset=UTF-8"})
    public String login(User currUser,HttpSession session, HttpServletRequest request){
        String code = (String) session.getAttribute("validateCode");
        String submitCode = WebUtils.getCleanParam(request, "validateCode");
        if (StringUtils.isEmpty(submitCode) || !StringUtils.equals(code,submitCode.toLowerCase())) {
            return "redirect:/";
        }
        Subject user = SecurityUtils.getSubject();
        UsernamePasswordToken token = new UsernamePasswordToken(currUser.getAccount(),currUser.getPassword());
        token.setRememberMe(true);
        try {
            user.login(token);
            return "/system/main";
        }catch (AuthenticationException e) {
            token.clear();
            return "redirect:/";
        }
    }

    /**
     * 生成验证码
     * @param request
     * @param response
     * @throws IOException
     */
    @RequestMapping(value = "/validateCode")
    public void validateCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setHeader("Cache-Control", "no-cache");
        String verifyCode = ValidateCode.generateTextCode(ValidateCode.TYPE_NUM_ONLY, 4, null);
        request.getSession().setAttribute("validateCode", verifyCode);
        response.setContentType("image/jpeg");
        BufferedImage bim = ValidateCode.generateImageCode(verifyCode, 90, 30, 3, true, Color.WHITE, Color.BLACK, null);
        ImageIO.write(bim, "JPEG", response.getOutputStream());
    }
}

 

 三、修改login.jsp

<%@ page language="java" pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    <title>shirodemo login page</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <script type="text/javascript" src='<c:url value="/resources/js/jquery-1.6.3.min.js"/>'></script>
    <script type="text/javascript">
    <!--
    function reloadValidateCode(){
        $("#validateCodeImg").attr("src","<%=basePath%>/validateCode?data=" + new Date() + Math.floor(Math.random()*24));
    }
    //-->
    </script>
  </head>
  
  <body>
    <form action="<%=basePath%>/login" method="post">
    <ul>
        <li>姓　名：<input type="text" name="account" /> </li>
        <li>密　码：<input type="text" name="password" /> </li>
        <li>验证码：<input type="text" name="validateCode" />&nbsp;&nbsp;<img id="validateCodeImg" src="<%=basePath%>/validateCode" />&nbsp;&nbsp;<a href="#" onclick="javascript:reloadValidateCode();">看不清？</a></li>
        <li><input type="submit" value="确认" /> </li>
    </ul>
    </form>
  </body>
</html>

 

至此，就给你的登陆页面加上验证码了。访问你的login.jsp试试？