spring boot实现验证码功能

2019-11-26 08:48:30

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本文实例为大家分享了spring boot实现验证码功能的具体代码，供大家参考，具体内容如下

流程是按照交互顺序。

1.controller层代码，获取验证码，以及生成验证码图片。

1.1获取html

@RequestMapping(value="/authImage",method=RequestMethod.GET) public String authImage(){ return "authImage"; }

1.2 html

<!DOCTYPE html><html>  <head> <title>验证码</title> </head> <body> <table> <tr> <td nowrap width="437"></td> <td>  <img id="img" src="/image" />  <a href='#' οnclick="javascript:changeImg()" style="color:white;"><label style="color:black;">看不清？</label></a> </td> </tr> </table> <!-- 触发JS刷新--> <script type="text/javascript"> function changeImg(){ var img = document.getElementById("img");  img.src = "/image?date=" + new Date(); }</script></body></html>

1.3.获取验证码图片

@RequestMapping(value="/getImage",method=RequestMethod.GET) public void authImage(HttpServletRequest request, HttpServletResponse response) throws IOException { response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); response.setContentType("image/jpeg"); // 生成随机字串 String verifyCode = VerifyCodeUtils.generateVerifyCode(4); // 存入会话session HttpSession session = request.getSession(true); // 删除以前的 session.removeAttribute("verCode"); session.removeAttribute("codeTime"); session.setAttribute("verCode", verifyCode.toLowerCase()); session.setAttribute("codeTime", LocalDateTime.now()); // 生成图片 int w = 100, h = 30; OutputStream out = response.getOutputStream(); VerifyCodeUtils.outputImage(w, h, out, verifyCode); }

1.4 核对验证码

 @RequestMapping(value="validImage",method=RequestMethod.GET) public String validImage(HttpServletRequest request,HttpSession session){ String code = request.getParameter("code"); Object verCode = session.getAttribute("verCode"); if (null == verCode) { request.setAttribute("errmsg", "验证码已失效，请重新输入"); return "验证码已失效，请重新输入"; } String verCodeStr = verCode.toString(); LocalDateTime localDateTime = (LocalDateTime)session.getAttribute("codeTime"); long past = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli(); long now = LocalDateTime.now().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli(); if(verCodeStr == null || code == null || code.isEmpty() || !verCodeStr.equalsIgnoreCase(code)){ request.setAttribute("errmsg", "验证码错误"); return "验证码错误"; } else if((now-past)/1000/60>5){ request.setAttribute("errmsg", "验证码已过期，重新获取"); return "验证码已过期，重新获取"; } else { //验证成功，删除存储的验证码 session.removeAttribute("verCode"); return "200"; } }

2、VerifyCodeUtils的工具类

package com.example.springboot.demo.util.varcode; import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.RenderingHints;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Arrays;import java.util.Random; import javax.imageio.ImageIO; public class VerifyCodeUtils{  //使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符 public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; private static Random random = new Random();   /** * 使用系统默认字符源生成验证码 * @param verifySize 验证码长度 * @return */ public static String generateVerifyCode(int verifySize){ return generateVerifyCode(verifySize, VERIFY_CODES); } /** * 使用指定源生成验证码 * @param verifySize 验证码长度 * @param sources 验证码字符源 * @return */ public static String generateVerifyCode(int verifySize, String sources){ if(sources == null || sources.length() == 0){  sources = VERIFY_CODES; } int codesLen = sources.length(); Random rand = new Random(System.currentTimeMillis()); StringBuilder verifyCode = new StringBuilder(verifySize); for(int i = 0; i < verifySize; i++){  verifyCode.append(sources.charAt(rand.nextInt(codesLen-1))); } return verifyCode.toString(); }  /** * 生成随机验证码文件,并返回验证码值 * @param w * @param h * @param outputFile * @param verifySize * @return * @throws IOException */ public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{ String verifyCode = generateVerifyCode(verifySize); outputImage(w, h, outputFile, verifyCode); return verifyCode; }  /** * 输出随机验证码图片流,并返回验证码值 * @param w * @param h * @param os * @param verifySize * @return * @throws IOException */ public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{ String verifyCode = generateVerifyCode(verifySize); outputImage(w, h, os, verifyCode); return verifyCode; }  /** * 生成指定验证码图像文件 * @param w  * @param h * @param outputFile * @param code * @throws IOException */ public static void outputImage(int w, int h, File outputFile, String code) throws IOException{ if(outputFile == null){  return; } File dir = outputFile.getParentFile(); if(!dir.exists()){  dir.mkdirs(); } try{  outputFile.createNewFile();  FileOutputStream fos = new FileOutputStream(outputFile);  outputImage(w, h, fos, code);  fos.close(); } catch(IOException e){  throw e; } }  /** * 输出指定验证码图片流 * @param w * @param h * @param os * @param code * @throws IOException */ public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{ int verifySize = code.length(); BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Random rand = new Random(); Graphics2D g2 = image.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); Color[] colors = new Color[5]; Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,  Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,  Color.PINK, Color.YELLOW }; float[] fractions = new float[colors.length]; for(int i = 0; i < colors.length; i++){  colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];  fractions[i] = rand.nextFloat(); } Arrays.sort(fractions);   g2.setColor(Color.GRAY);// 设置边框色 g2.fillRect(0, 0, w, h);   Color c = getRandColor(200, 250); g2.setColor(c);// 设置背景色 g2.fillRect(0, 2, w, h-4);   //绘制干扰线 Random random = new Random(); g2.setColor(getRandColor(160, 200));// 设置线条的颜色 for (int i = 0; i < 20; i++) {  int x = random.nextInt(w - 1);  int y = random.nextInt(h - 1);  int xl = random.nextInt(6) + 1;  int yl = random.nextInt(12) + 1;  g2.drawLine(x, y, x + xl + 40, y + yl + 20); }   // 添加噪点 float yawpRate = 0.05f;// 噪声率 int area = (int) (yawpRate * w * h); for (int i = 0; i < area; i++) {  int x = random.nextInt(w);  int y = random.nextInt(h);  int rgb = getRandomIntColor();  image.setRGB(x, y, rgb); }   shear(g2, w, h, c);// 使图片扭曲  g2.setColor(getRandColor(100, 160)); int fontSize = h-4; Font font = new Font("Algerian", Font.ITALIC, fontSize); g2.setFont(font); char[] chars = code.toCharArray(); for(int i = 0; i < verifySize; i++){  AffineTransform affine = new AffineTransform();  affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);  g2.setTransform(affine);  g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10); }   g2.dispose(); ImageIO.write(image, "jpg", os); }  private static Color getRandColor(int fc, int bc) { 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); }  private static int getRandomIntColor() { int[] rgb = getRandomRgb(); int color = 0; for (int c : rgb) {  color = color << 8;  color = color | c; } return color; }  private static int[] getRandomRgb() { int[] rgb = new int[3]; for (int i = 0; i < 3; i++) {  rgb[i] = random.nextInt(255); } return rgb; }  private static void shear(Graphics g, int w1, int h1, Color color) { shearX(g, w1, h1, color); shearY(g, w1, h1, color); }  private static 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 static void shearY(Graphics g, int w1, int h1, Color color) {  int period = random.nextInt(40) + 10; // 50;  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);  }  }  } }}

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