图片验证码工具类

图片验证码工具类

文章

https://blog.csdn.net/lzxlfly/article/details/93381526

需求

  1. session中放入登录验证码，一定时间后定时清除。
  2. 每次使用过验证码后清除，需要重新生成验证码。

工具类

package com.yuantiao.smartcardms.util;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

public class CaptchaCodeUtil {

    public static void main(String[] args) throws IOException {
//        CaptchaCodeUtil captchaCodeUtil = new CaptchaCodeUtil();
//        captchaCodeUtil.createImageCode("changhe");
//        captchaCodeUtil.write(new FileOutputStream("d:\\00\\jie1.jpg"));
        CaptchaCodeUtil code = CaptchaCodeUtil.of(200, 50, "xiechangzhou");
        code.write(new FileOutputStream("d:\\00\\jie1.jpg"));
    }
    /**
     * 验证码图片的宽度
     */
    private  int width=160;
    /**
     * 验证码图片的宽度
     */
    private  int height=40;
    /**
     * 干扰线的数量
     */
    private  int lineCount=20;
    /**
     * 验证码
     */
    private  String  code=null;

    /**
     * 验证码图片上字符个数
     */
    private  int  codeCount=4;

    /**
     * 验证码图片Buffer
     */
    private BufferedImage buffImg = null;

    Random random = new Random();

    public CaptchaCodeUtil(){
        createImageCode();
    }

    public static CaptchaCodeUtil of(int width, int height, String code){
        CaptchaCodeUtil captchaCodeUtil = new CaptchaCodeUtil(width, height, code.length(), 20, code);
        captchaCodeUtil.createImageCode(code);
        return captchaCodeUtil;
    }

    /**
     * 指定宽高
     * @param width
     * @param height
     */
    public CaptchaCodeUtil(int width, int height){
        this.width=width;
        this.height=height;
        createImageCode();
    }

    /**
     * 指定宽高和干扰线的数量
     * @param width
     * @param height
     * @param lineCount
     */
    public CaptchaCodeUtil(int width, int height, int lineCount){
        this.width=width;
        this.height=height;
        this.lineCount=lineCount;
        createImageCode();
    }

    /**
     * 指定宽高、验证码字符个数、干扰线数量
     * @param width
     * @param height
     * @param codeCount
     * @param lineCount
     */
    public CaptchaCodeUtil(int width, int height, int codeCount, int lineCount){
        this.width=width;
        this.height=height;
        this.codeCount=codeCount;
        this.lineCount=lineCount;
        createImageCode();
    }

    /**
     * 指定宽高、验证码字符个数、干扰线数量、
     * @param width
     * @param height
     * @param codeCount
     * @param lineCount
     * @param code
     */
    public CaptchaCodeUtil(int width, int height, int codeCount, int lineCount, String code){
        this.width=width;
        this.height=height;
        this.codeCount=codeCount;
        this.lineCount=lineCount;
        createImageCode(code);
    }

    /**
     * 生成验证码
     */
    private void createImageCode(){
        // 字体的宽度
        int fontWidth = width / codeCount;
        // 字体的高度
        int fontHeight = height - 5;
        // 偏移量
        int codeY = height - 8;

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImg.getGraphics();
        // 设置背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);

        // 设置字体
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);

        // 设置干扰线
        setLine(g);

        // 添加噪点
        // 噪声率
        float yawpRate = 0.01f;
        int area = (int) (yawpRate * width * height);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            buffImg.setRGB(x, y, random.nextInt(255));
        }
        // 得到随机字符
        String str1 = randomStr(codeCount);
        this.code = str1;
        for (int i = 0; i < codeCount; i++) {
            String strRand = str1.substring(i, i + 1);
            g.setColor(getRandColor(1, 255));
            // a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处
            g.drawString(strRand, i*fontWidth+3, codeY);
        }

    }
    /**
     * 生成指定字符图片
     */
    private void createImageCode(String code) {
        // 字体的宽度
        int fontWidth = width / codeCount;
        // 字体的高度
        int fontHeight = height - 5;
        int codeY = height - 8;

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImg.getGraphics();
        // 设置背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);

        // 设置字体
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);

        // 设置干扰线
        setLine(g);

        // 添加噪点
        // 噪声率
        float yawpRate = 0.01f;
        int area = (int) (yawpRate * width * height);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);

            buffImg.setRGB(x, y, random.nextInt(255));
        }

        this.code = code;
        for (int i = 0; i < code.length(); i++) {
            String strRand = code.substring(i, i + 1);
            g.setColor(getRandColor(1, 255));
            // a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处
            g.drawString(strRand, i*fontWidth+3, codeY);
        }

    }

    /**
     * 设置干扰线
     * @param g
     */
    private void setLine(Graphics g){
        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width);
            int ye = ys + random.nextInt(height);
            g.setColor(getRandColor(1, 255));
            g.drawLine(xs, ys, xe, ye);
        }

    }
    /**
     * 得到随机字符
     * @param n
     * @return
     */
    public String randomStr(int n) {
        String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
        String str2 = "";
        int len = str1.length() - 1;
        double r;
        for (int i = 0; i < n; i++) {
            r = (Math.random()) * len;
            str2 = str2 + str1.charAt((int) r);
        }
        return str2;
    }

    /**
     * 得到随机颜色
     * @param fc
     * @param bc
     * @return
     */
    private Color getRandColor(int fc, int bc) {
        // 给定范围获得随机颜色
        if (fc > 255){
            fc = 255;
        }
        if (bc > 255){
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    /**
     * 产生随机字体
     */
    private Font getFont(int size) {
        Random random = new Random();
        Font font[] = new Font[5];
        font[0] = new Font("Ravie", Font.PLAIN, size);
        font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
        font[2] = new Font("Fixedsys", Font.PLAIN, size);
        font[3] = new Font("Wide Latin", Font.PLAIN, size);
        font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
        return font[random.nextInt(5)];
    }

    /**
     * 扭曲方法
     * @param g
     * @param w1
     * @param h1
     * @param color
     */
    private void shear(Graphics g, int w1, int h1, Color color) {
        shearX(g, w1, h1, color);
        shearY(g, w1, h1, color);
    }

    private void shearX(Graphics g, int w1, int h1, Color color) {

        int period = random.nextInt(2);

        boolean borderGap = true;
        int frames = 1;
        int phase = random.nextInt(2);

        for (int i = 0; i < h1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(0, i, w1, 1, (int) d, 0);
            if (borderGap) {
                g.setColor(color);
                g.drawLine((int) d, i, 0, i);
                g.drawLine((int) d + w1, i, w1, i);
            }
        }

    }

    private void shearY(Graphics g, int w1, int h1, Color color) {

        int period = random.nextInt(40) + 10;

        boolean borderGap = true;
        int frames = 20;
        int phase = 7;
        for (int i = 0; i < w1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(i, 0, 1, h1, 0, (int) d);
            if (borderGap) {
                g.setColor(color);
                g.drawLine(i, (int) d, i, 0);
                g.drawLine(i, (int) d + h1, i, h1);
            }

        }

    }

    public void write(OutputStream sos) throws IOException {
        ImageIO.write(buffImg, "png", sos);
        sos.close();
    }

    public BufferedImage getBuffImg() {
        return buffImg;
    }

    public String getCode() {
        return code.toLowerCase();
    }
}
package com.yuantiao.smartcardms.web.user.login;

import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.yuantiao.smartcardms.dao.domain.result.Result;
import com.yuantiao.smartcardms.dao.domain.result.ResultFactory;
import com.yuantiao.smartcardms.dao.domain.user.SysUser;
import com.yuantiao.smartcardms.dict.user.Dict_session_key;
import com.yuantiao.smartcardms.param.user.LoginParam;
import com.yuantiao.smartcardms.service.user.ISysUserService;
import com.yuantiao.smartcardms.service.user.impl.SysUserServiceImpl;
import com.yuantiao.smartcardms.util.CaptchaCodeUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.session.HttpServletSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.time.LocalDateTime;

/**
 * @description:
 * @author: [email protected]
 * @date: 2019/11/1 15:55
 */
@Slf4j
@RequestMapping("/user")
@RestController
public class LoginController {
    @Autowired
    private ISysUserService sysUserService;

    @RequestMapping("/checkCode")
    public void checkCode(HttpServletRequest request, HttpServletResponse response){
        log.info("[系统用户pc登录图片验证码生成]");
        String checkCode = RandomStringUtils.randomAlphanumeric(5);
        HttpSession session = request.getSession();
        BufferedImage bufferedImage = CaptchaCodeUtil.of(200, 50, checkCode).getBuffImg();
        try {
            ImageIO.write(bufferedImage, "png", response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
        log.info("[系统用户pc登录图片验证码生成]将验证码放入session,checkCode={}", checkCode);
        session.setAttribute(Dict_session_key.USER_LOGIN_PC_CHECK_CODE, checkCode);
    }

    @RequestMapping("/login/pc")
    public Result login(@RequestBody LoginParam loginParam, HttpServletRequest request){
        log.info("[系统用户pc登录][入参]loginParam={}", JSONObject.toJSONString(loginParam));
        if(StringUtils.isBlank(loginParam.getCheckCode())){
            return ResultFactory.buildFailResult("验证码不能为空");
        }
        String sessionCheckCode = (String) request.getSession().getAttribute(Dict_session_key.USER_LOGIN_PC_CHECK_CODE);
        request.getSession().removeAttribute(Dict_session_key.USER_LOGIN_PC_CHECK_CODE);
        if(null == sessionCheckCode || !sessionCheckCode.equalsIgnoreCase(loginParam.getCheckCode())){
            return ResultFactory.buildFailResult("验证码错误");
        }
        if(StringUtils.isBlank(loginParam.getUsername())){
            return ResultFactory.buildFailResult("用户名不能为空");
        }
        if(StringUtils.isBlank(loginParam.getPassword())){
            return ResultFactory.buildFailResult("密码不能为空");
        }
        UsernamePasswordToken token = new UsernamePasswordToken(loginParam.getUsername(), loginParam.getPassword());
        Subject subject = SecurityUtils.getSubject();
        try {
            subject.login(token);
        } catch (IncorrectCredentialsException e) {
            return ResultFactory.buildFailResult("用户密码错误");
        } catch (UnknownAccountException e){
            return ResultFactory.buildFailResult("用户名不存在");
        } catch (Exception e){
            e.printStackTrace();
            return ResultFactory.buildFailResult("用户登录失败");
        }
        log.info("[系统用户pc登录][用户登录成功]");
        //获取登录用户
        SysUser sysUser = sysUserService.getOne(Wrappers.<SysUser>lambdaQuery()
                                                .eq(SysUser::getUsername, loginParam.getUsername())
                                                .eq(SysUser::getPassword, loginParam.getPassword())
                                               );
        request.getSession().setAttribute(Dict_session_key.CURRENT_USER, sysUser);
        //更新登录时间 todo 更新登录时间有问题
        boolean update = sysUserService.update(Wrappers.<SysUser>lambdaUpdate()
                                               .eq(SysUser::getId, sysUser.getId())
                                               .set(SysUser::getLoginTime, LocalDateTime.now())
                                              );
        if (!update){
            log.info("[系统用户pc登录][更新用户登录时间失败]");
        }
        sysUser.setPassword("***");
        return ResultFactory.buildSuccessResult(sysUser);
    }

    @RequestMapping("/logout")
    public void logout(){
        log.info("[系统用户pc退出]");
        Subject subject = SecurityUtils.getSubject();
        subject.logout();
    }

}

bugs

严重: Servlet.service() for servlet [dispatcherServlet] in context with path [/smartcard] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Cannot create a session after the response has been committed] with root cause
java.lang.IllegalStateException: Cannot create a session after the response has been committed
原因：在response.getOutputStream()之后使用request.getSession()，应该放在前面获取session。

原文地址：https://www.cnblogs.com/mozq/p/11786024.html

时间： 2024-10-07 17:50:23

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