SpringBoot登录验证码实现过程详解

今天记录一下验证码的实现，希望能够帮助到大家！

首先我们看一下实现的效果：

此验证码的实现没有用到太多的插件，话不多说直接上代码，大家拿过去就可以用。

中间用到了org.apache.commons.lang3.RandomUtils工具类，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.验证码类

package com.youyou.login.util.validatecode;

import lombok.Data;

/**
* 验证码类
*/
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;
 }

}

2.验证码生成接口

package com.youyou.login.util.validatecode;

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;
}

3.验证码生成实现类

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;
/**
* 验证码实现类
*/
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;
/**
* 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
graphics.setColor(Color.WHITE);
//设置矩形坐标x y 为0
graphics.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);
}
}
/**
* 生成随机字符
*
* @param width
* @param height
* @param os
* @return
* @throws IOException
*/
@Override
public 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
*/
@Override
public 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),
+ 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));
}
}
}

4.工具类

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);
}
}

经过以上代码，我们的验证码生成功能基本上已经实现了，现在还需要一个controller来调用它。

@ApiOperation(value = "验证码")
@GetMapping("/verifyCode")
public void verifyCode(HttpServletRequest request, HttpServletResponse response) {
IVerifyCodeGen iVerifyCodeGen = new SimpleCharVerifyCodeGenImpl();
try {
//设置长宽
VerifyCode verifyCode = iVerifyCodeGen.generate(80, 28);
String code = verifyCode.getCode();
LOGGER.info(code);
//将VerifyCode绑定session
request.getSession().setAttribute("VerifyCode", code);
//设置响应头
response.setHeader("Pragma", "no-cache");
//设置响应头
response.setHeader("Cache-Control", "no-cache");
//在代理服务器端防止缓冲
response.setDateHeader("Expires", 0);
//设置响应内容类型
response.setContentType("image/jpeg");
response.getOutputStream().write(verifyCode.getImgBytes());
response.getOutputStream().flush();
}
catch (IOException e) {
LOGGER.info("", e);
}
}

搞定！后台编写到此结束了。那么又会有博友说了：“说好的实现效果呢？”

好吧，那么我们继续前端的代码编写。

前端代码:

<html>
<body>

<div>
<input id="code" placeholder="验证码" type="text" class=""
style="width:170px">
<!-- 验证码 显示 -->
<img οnclick="javascript:getvCode()" id="verifyimg" style="margin-left: 20px;"/>
</div>

<script type="text/javascript">
getvCode();

/**
* 获取验证码
* 将验证码写到login.html页面的id = verifyimg 的地方
*/
function getvCode() {
document.getElementById("verifyimg").src = timestamp("http://127.0.0.1:81/verifyCode");
}
//为url添加时间戳
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>

可以实现点击图片更换验证码。

实现效果：

当然文章开头的截图是我系统中的截图，需要大家自己去根据自己的情况去开发前端了。

来源：https://blog.csdn.net/qq_37651267/article/details/99305573