Java实现登录验证码功能

目录

1、效果

2、代码

3、整体下载地址

1、效果

可以不停的变

变

2、代码（有可能不全）

（1）验证码随机字符

import java.awt.*;import java.util.Random;//生成验证码随机字符public class RandomUtils extends mons.lang3.RandomUtils {private static final char[] CODE_SEQ = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J','K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W','X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j','k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w','x', 'y', 'z', '2', '3', '4', '5', '6', '7', '8', '9'};private static final char[] NUMBER_ARRAY = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};private static Random random = new Random();public static String randomString(int length) {StringBuilder sb = new StringBuilder();for (int i = 0; i < length; i++) {sb.append(String.valueOf(CODE_SEQ[random.nextInt(CODE_SEQ.length)]));}return sb.toString();}public static String randomNumberString(int length) {StringBuilder sb = new StringBuilder();for (int i = 0; i < length; i++) {sb.append(String.valueOf(NUMBER_ARRAY[random.nextInt(NUMBER_ARRAY.length)]));}return sb.toString();}public static Color randomColor(int fc, int bc) {int f = fc;int b = bc;Random random = new Random();if (f > 255) {f = 255;}if (b > 255) {b = 255;}return new Color(f + random.nextInt(b - f), f + random.nextInt(b - f), f + random.nextInt(b - f));}public static int nextInt(int bound) {return random.nextInt(bound);}}

（2）工具类

public class VerifyCode {private String code;private byte[] imgBytes;private long expireTime;public String getCode() {return code;}public void setCode(String code) {this.code = code;}public byte[] getImgBytes() {return imgBytes;}public void setImgBytes(byte[] imgBytes) {this.imgBytes = imgBytes;}public long getExpireTime() {return expireTime;}public void setExpireTime(long expireTime) {this.expireTime = expireTime;}}

（3）验证码生成接口

import java.io.IOException;import java.io.OutputStream;//验证码生成接口public interface IVerifyCodeGen {/*** 生成验证码并返回code，将图片写的os中** @param width* @param height* @param os* @return* @throws IOException*/String generate(int width, int height, OutputStream os) throws IOException;/*** 生成验证码对象** @param width* @param height* @return* @throws IOException*/VerifyCode generate(int width, int height) throws IOException;}

（4）Service

import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Random;@Servicepublic class SimpleCharVerifyCodeGenImpl implements IVerifyCodeGen {private static final Logger logger = LoggerFactory.getLogger(SimpleCharVerifyCodeGenImpl.class);private static final String[] FONT_TYPES = {"\u5b8b\u4f53", "\u65b0\u5b8b\u4f53", "\u9ed1\u4f53", "\u6977\u4f53", "\u96b6\u4e66"};private static final int VALICATE_CODE_LENGTH = 4;/*** 生成随机字符** @param width* @param height* @param os* @return* @throws IOException*/@Overridepublic String generate(int width, int height, OutputStream os) throws IOException {BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics graphics = image.getGraphics();fillBackground(graphics, width, height);String randomStr = RandomUtils.randomString(VALICATE_CODE_LENGTH);createCharacter(graphics, randomStr);graphics.dispose();//设置JPEG格式ImageIO.write(image, "JPEG", os);return randomStr;}/*** 验证码生成** @param width* @param height* @return*/@Overridepublic VerifyCode generate(int width, int height) {VerifyCode verifyCode = null;try (//将流的初始化放到这里就不需要手动关闭流ByteArrayOutputStream baos = new ByteArrayOutputStream();) {String code = generate(width, height, baos);verifyCode = new VerifyCode();verifyCode.setCode(code);verifyCode.setImgBytes(baos.toByteArray());} catch (IOException e) {logger.error(e.getMessage(), e);verifyCode = null;}return verifyCode;}/*** 设置字符颜色大小** @param g* @param randomStr*/private void createCharacter(Graphics g, String randomStr) {char[] charArray = randomStr.toCharArray();for (int i = 0; i < charArray.length; i++) {//设置RGB颜色算法参数g.setColor(new Color(50 + RandomUtils.nextInt(100),50 + RandomUtils.nextInt(100), 50 + RandomUtils.nextInt(100)));//设置字体大小，类型g.setFont(new Font(FONT_TYPES[RandomUtils.nextInt(FONT_TYPES.length)], Font.BOLD, 26));//设置x y 坐标g.drawString(String.valueOf(charArray[i]), 15 * i + 5, 19 + RandomUtils.nextInt(8));}}/*** 设置背景颜色及大小，干扰线** @param graphics* @param width* @param height*/private static void fillBackground(Graphics graphics, int width, int height) {// 填充背景System.setProperty("myColor", "#BBDAEE");graphics.setColor(Color.getColor("myColor"));//设置矩形坐标x y 为0graphics.fillRect(0, 0, width, height);// 加入干扰线条for (int i = 0; i < 8; i++) {//设置随机颜色算法参数graphics.setColor(RandomUtils.randomColor(40, 150));Random random = new Random();int x = random.nextInt(width);int y = random.nextInt(height);int x1 = random.nextInt(width);int y1 = random.nextInt(height);graphics.drawLine(x, y, x1, y1);}}}

（5）LoginController

@Controller@RequestMapping("login")@ResponseBodypublic class LoginController {@Resourceprivate UserService userService;/*** 获取验证码controller* @param response* @param request*/@RequestMapping(value = "verifyCode",method = RequestMethod.GET)public void verifyCode(HttpServletResponse response, HttpServletRequest request){IVerifyCodeGen iVerifyCodeGen = new SimpleCharVerifyCodeGenImpl();//设置长宽try {VerifyCode verifyCode = iVerifyCodeGen.generate(120, 28);String code = verifyCode.getCode();request.getSession().setAttribute("VerifyCode",code);response.setHeader("Pragma","no-cache");response.setHeader("Cache-Control","no-cache");response.setDateHeader("Expires",0);response.setContentType("image/jpeg");response.getOutputStream().write(verifyCode.getImgBytes());response.getOutputStream().flush();} catch (IOException e) {e.printStackTrace();}}

（6）前端

<script>$(function () {// 页面加载时先请求验证码getvCode();});//登录请求接口$("#btnLogin").click(function () {$.ajax({type:"POST",url:"/login",data:$("#myForm").serialize(),dataType:"json",success:function (vo) {if(vo.code === 200){window.location.href = "/pages/index.html";}else {alert(vo.msg);}}});});/*** 获取验证码* 将验证码写到login.html页面的id = verifyimg 的地方*/function getvCode() {var getTimestamp = new Date().getTime();let requestUrl = "/login/verifyCode?timestamp="+getTimestamp;$("#verifyImg").attr('src', requestUrl);}/*** 点击图片刷新验证码*/$("#verifyImg").click(function () {getvCode();});</script>

3、整体下载地址

Java实现登录验证码功能-Java文档类资源-CSDN下载