©2020-2024 ioDraw All rights reserved,
Privacy Policy
首先自己导入Vue和jQuery等需要的包，这里我就不放图了。
工具类由于过长我放在文章的最后
在html写入基本请求验证码
<input type="text" name="yzm" placeholder="填写右侧的验证码"
data-validate="required:请填写右侧的验证码" v-model="yzm" /> <img src="/in/getImage"
alt="" width="100" height="32" class="passcode"
style="height:43px;cursor:pointer;" onclick="this.src=this.src+'?'">
src="/in/getImage"
代码的意思是通过路径请求验证码
οnclick="this.src=this.src+'?'"
这句 代码的意思主要是通过点击事件去请求重新获取验证码
因为这是一个项目的代码片段所以我这把返回登录的控制器代码附上
@RequestMapping("login") public String login(Model model,HttpServletRequest
request){ return "/news/login"; }
下面附上Vue的代码实例
我这里还有传的参数用来判断用户名是否登录成功的
<script> var vm = new Vue({ el:"#app", data:{ uname:"", pwd:"", yzm:"" },
methods:{ login:function () {
$.post("/in/doLogin",{uname:this.uname,pwd:this.pwd,yzm:this.yzm},function
(data) { if (data.info==1){ alert(data.success);
window.location.href="/in/index"; } else { alert(data.success); } }); },//login
}, }); </script>
这一步应该就到了去获取验证码的代码了，同时 我们应该给赋值上session
/** * 生成验证码 * @param request * @param response * @throws IOException */
@RequestMapping("getImage") 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); }
这边我们点击提交应该去判断验证码和用户名密码的是否正确
@RequestMapping("doLogin") @ResponseBody public JSONObject
doLogin(HttpServletRequest request){ String uname =
request.getParameter("uname"); String pwd = request.getParameter("pwd"); String
yzm = request.getParameter("yzm").toLowerCase(); System.out.println(uname+"
"+pwd); User user = userService.findByUnameAndPwd(uname,pwd); HttpSession
session = request.getSession(); JSONObject data = new JSONObject();
System.out.println(session.getAttribute("verCode")); if
(!yzm.equals(session.getAttribute("verCode"))){ data.put("info","0");
data.put("success","验证码错误"); }else if (user==null || user.equals("")){
data.put("success","用户名或密码错误"); data.put("info","0"); }else {
session.setAttribute("uname",uname); data.put("success","登录成功");
data.put("info","1"); } return data; }
这是写的一个小判断。仅供参考！
在最后给大家附上工具类的一个代码
package com.msfh.news.until; 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); } } } }