今天記錄一下驗證碼的實現，希望能夠幫助到大家！

首先我們看一下實現的效果：

此驗證碼的實現沒有用到太多的插件，話不多說直接上代碼，大家拿過去就可以用。

中間用到了org.apache.commons.lang3.RandomUtils工具類，需要pom配置：

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.10</version> </dependency>

1.驗證碼類

package com.youyou.login.util.validatecode;import lombok.Data;/*** 驗證碼類*/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; }}

2.驗證碼生成接口

package com.youyou.login.util.validatecode;import java.io.IOException;import java.io.OutputStream;/*** 驗證碼生成接口*/public interface IVerifyCodeGen {/*** 生成驗證碼并返回code，將圖片寫的os中** @param width* @param height* @param os* @return* @throws IOException*/String generate(int width, int height, OutputStream os) throws IOException;/*** 生成驗證碼對象** @param width* @param height* @return* @throws IOException*/VerifyCode generate(int width, int height) throws IOException;}

3.驗證碼生成實現類

package com.youyou.login.util.validatecode;import com.youyou.util.RandomUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;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;/*** 驗證碼實現類*/public class SimpleCharVerifyCodeGenImpl implements IVerifyCodeGen {private static final Logger logger = LoggerFactory.getLogger(SimpleCharVerifyCodeGenImpl.class);private static final String[] FONT_TYPES = { 'u5b8bu4f53', 'u65b0u5b8bu4f53', 'u9ed1u4f53', 'u6977u4f53', 'u96b6u4e66' };private static final int VALICATE_CODE_LENGTH = 4;/*** 設置背景顏色及大小，干擾線** @param graphics* @param width* @param height*/private static void fillBackground(Graphics graphics, int width, int height) {// 填充背景graphics.setColor(Color.WHITE);//設置矩形坐標x y 為0graphics.fillRect(0, 0, width, height);// 加入干擾線條for (int i = 0; i < 8; i++) {//設置隨機顏色算法參數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);}}/*** 生成隨機字符** @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();//設置JPEG格式ImageIO.write(image, 'JPEG', os);return randomStr;}/*** 驗證碼生成** @param width* @param height* @return*/@Overridepublic VerifyCode generate(int width, int height) {VerifyCode verifyCode = null;try (//將流的初始化放到這里就不需要手動關閉流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;}/*** 設置字符顏色大小** @param g* @param randomStr*/private void createCharacter(Graphics g, String randomStr) {char[] charArray = randomStr.toCharArray();for (int i = 0; i < charArray.length; i++) {//設置RGB顏色算法參數g.setColor(new Color(50 + RandomUtils.nextint(100),+ RandomUtils.nextint(100), 50 + RandomUtils.nextint(100)));//設置字體大小，類型g.setFont(new Font(FONT_TYPES[RandomUtils.nextint(FONT_TYPES.length)], Font.BOLD, 26));//設置x y 坐標g.drawString(String.valueOf(charArray[i]), 15 * i + 5, 19 + RandomUtils.nextint(8));}}}

4.工具類

package com.youyou.util;import java.awt.*;import java.util.Random;public class RandomUtils extends org.apache.commons.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’, ’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);}}

經過以上代碼，我們的驗證碼生成功能基本上已經實現了，現在還需要一個controller來調用它。

@ApiOperation(value = '驗證碼')@GetMapping('/verifyCode')public void verifyCode(HttpServletRequest request, HttpServletResponse response) {IVerifyCodeGen iVerifyCodeGen = new SimpleCharVerifyCodeGenImpl();try {//設置長寬VerifyCode verifyCode = iVerifyCodeGen.generate(80, 28);String code = verifyCode.getCode();LOGGER.info(code);//將VerifyCode綁定sessionrequest.getSession().setAttribute('VerifyCode', code);//設置響應頭response.setHeader('Pragma', 'no-cache');//設置響應頭response.setHeader('Cache-Control', 'no-cache');//在代理服務器端防止緩沖response.setDateHeader('Expires', 0);//設置響應內容類型response.setContentType('image/jpeg');response.getOutputStream().write(verifyCode.getImgBytes());response.getOutputStream().flush();}catch (IOException e) {LOGGER.info('', e);}}

搞定！后臺編寫到此結束了。那么又會有博友說了：“說好的實現效果呢？”

好吧，那么我們繼續前端的代碼編寫。

前端代碼:

<html><body><div><input placeholder='驗證碼' type='text' class=''style='width:170px'><!-- 驗證碼 顯示 --><img οnclick='javascript:getvCode()' /></div><script type='text/javascript'>getvCode();/*** 獲取驗證碼* 將驗證碼寫到login.html頁面的id = verifyimg 的地方*/function getvCode() {document.getElementById('verifyimg').src = timestamp('http://127.0.0.1:81/verifyCode');}//為url添加時間戳function timestamp(url) {var getTimestamp = new Date().getTime();if (url.indexOf('?') > -1) {url = url + '&timestamp=' + getTimestamp} else {url = url + '?timestamp=' + getTimestamp}return url;};</script></body></html>

可以實現點擊圖片更換驗證碼。

實現效果：

當然文章開頭的截圖是我系統中的截圖，需要大家自己去根據自己的情況去開發前端了。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。