大家好，又见面了，我是你们的朋友全栈君。
场景
前端Vue的登录页面，验证码请求后台，后台生成验证码照片后使用Base64编码后，
返回给前端，前端进行显示。
注：
博客：
https://blog.csdn.net/badao_liumang_qizhi
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实现
首先看前端页面login.vue
<el-form-item prop="code">
<el-input
v-model="loginForm.code"
auto-complete="off"
placeholder="验证码"
style="width: 63%"
@keyup.enter.native="handleLogin"
>
<svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon" />
</el-input>
<div class="login-code">
<img :src="codeUrl" @click="getCode" />
</div>这里验证码的图片的src属性是绑定的codeUrl，此属性来自于请求后台，并且绑定点击事件为getCode
此方法也是请求后台获取验证码。
所以需要提前声明codeUrl属性
data() {
return {
codeUrl: "",然后在页面加载完时请求后台接口获取验证码图片。
所以在created函数中执行请求验证码图片的方法
created() {
this.getCode();
},此方法的具体实现
methods: {
getCode() {
getCodeImg().then(res => {
this.codeUrl = "data:image/gif;base64," + res.img;
this.loginForm.uuid = res.uuid;
});
},在此方法中调用了请求后台接口获取验证码图片编码后的代码并在前面拼接上
"data:image/gif;base64,"data:image/png;base64的用法详解
网页上有些图片的src或css背景图片的url后面跟了一大串字符，比如：
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FFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQB//2Q=='/>这是Data URI scheme。
Data URI scheme是在RFC2397中定义的，目的是将一些小的数据，直接嵌入到网页中，从而不用再从外部文件载入。比如上面那串字符，其实是一张图片。
在上面的Data URI中，data表示取得数据的协定名称，image/jpg 是数据类型名称，base64 是数据的编码方法，逗号后面就是这个image/png文件base64编码后的数据。 目前，Data URI scheme支持的类型有：
data:,文本数据
data:text/plain,文本数据
data:text/html,HTML代码
data:text/html;base64,base64编码的HTML代码
data:text/css,CSS代码
data:text/css;base64,base64编码的CSS代码
data:text/javascript,Javascript代码
data:text/javascript;base64,base64编码的Javascript代码
data:image/gif;base64,base64编码的gif图片数据
data:image/png;base64,base64编码的png图片数据
data:image/jpeg;base64,base64编码的jpeg图片数据
data:image/x-icon;base64,base64编码的icon图片数据
base64简单地说，它把一些 8-bit 数据翻译成标准 ASCII 字符。
我们把图像文件的内容直接写在了HTML 文件中，这样做的好处是，节省了一个HTTP 请求。坏处呢，就是浏览器不会缓存这种图像。
我们可以找一些在线网站将图片进行Base64编码。
https://tool.oschina.net/encrypt?type=4
所以在上面的请求图片验证的图片的src绑定的codeUrl中的路径是如下这种拼接的，所以后台SpringBoot只需要生成图片验证码并将其使用Base64b编码并返回即可。就是这里的res.img。
除了返回了img还返回了uuid这个属性，这就是用来控制验证码是否生效的字段。
UUID 是指Universally Unique Identifier，翻译为中文是通用唯一识别码，UUID 的目的是让分布式系统中的所有元素都能有唯一的识别信息
getCode() {
getCodeImg().then(res => {
this.codeUrl = "data:image/gif;base64," + res.img;
this.loginForm.uuid = res.uuid;
});将获取的uuid赋值给登录表单的uuid属性，所以需要提前声明uuid属性
data() {
return {
codeUrl: "",
loginForm: {
username: "",
password: "",
rememberMe: false,
code: "",
uuid: ""
},使验证码在2分钟有效的逻辑是
在每次请求验证码的接口时会生成一个uuid,并且将这个uuid存储进Redis缓存中并设置2分钟有效期。
然后验证码接口将验证码和uuid一起返回给前端，前端将其接受并将其存储进表单对象的uuid属性。
在登录接口中接收前端提交过来的表单对象的uuid属性然后去Redis缓存中去查询，如果为空则证明已经过了2分钟则是验证码失效。
上面的请求验证码的接口方法 getCodeImg()是引用的外部js的方法
import { getCodeImg } from "@/api/login";在login.js中
// 获取验证码
export function getCodeImg() {
return request({
url: '/captchaImage',
method: 'get'
})
}实现向后台指定的url发动get请求，这里的request是封装的axios请求的对象，不再细讲。
下面看验证码接口的SpringBoot代码
@GetMapping("/captchaImage")
public AjaxResult getCode(HttpServletResponse response) throws IOException
{
// 生成随机字串
String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
// 唯一标识
String uuid = IdUtils.simpleUUID();
String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;
redisCache.setCacheObject(verifyKey, verifyCode, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
// 生成图片
int w = 111, h = 36;
ByteArrayOutputStream stream = new ByteArrayOutputStream();
VerifyCodeUtils.outputImage(w, h, stream, verifyCode);
try
{
AjaxResult ajax = AjaxResult.success();
ajax.put("uuid", uuid);
ajax.put("img", Base64.encode(stream.toByteArray()));
return ajax;
}
catch (Exception e)
{
e.printStackTrace();
return AjaxResult.error(e.getMessage());
}
finally
{
stream.close();
}
}首先是生成随机字符串verifyCode ，这里调用了一个工具类的方法generateVerifyCode，参数4代表验证码的长度。
/**
* 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);
}此方法调用了generateVerifyCode，并增加了一个验证码的取值范围的参数。
VERIFY_CODES声明
public static final String VERIFY_CODES = "123456789ABCDEFGHJKLMNPQRSTUVWXYZ";去掉了1,0,i,o几个容易混淆的字符
生成字符串的方法实现为
/**
* 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();
}再回到接口Controller
生成字符串之后生成UUID即唯一标识
String uuid = IdUtils.simpleUUID();
String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;这里也调用了一个工具类的方法
/**
* 简化的UUID，去掉了横线
*
* @return 简化的UUID，去掉了横线
*/
public static String simpleUUID()
{
return UUID.randomUUID().toString(true);
}此工具类方法又调用了UUID的randomUUID方法
UUID.java全部代码
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import com.ruoyi.common.exception.UtilException;
/**
* 提供通用唯一识别码（universally unique identifier）（UUID）实现
*
*/
public final class UUID implements java.io.Serializable, Comparable<UUID>
{
private static final long serialVersionUID = -1185015143654744140L;
/**
* SecureRandom 的单例
*
*/
private static class Holder
{
static final SecureRandom numberGenerator = getSecureRandom();
}
/** 此UUID的最高64有效位 */
private final long mostSigBits;
/** 此UUID的最低64有效位 */
private final long leastSigBits;
/**
* 私有构造
*
* @param data 数据
*/
private UUID(byte[] data)
{
long msb = 0;
long lsb = 0;
assert data.length == 16 : "data must be 16 bytes in length";
for (int i = 0; i < 8; i++)
{
msb = (msb << 8) | (data[i] & 0xff);
}
for (int i = 8; i < 16; i++)
{
lsb = (lsb << 8) | (data[i] & 0xff);
}
this.mostSigBits = msb;
this.leastSigBits = lsb;
}
/**
* 使用指定的数据构造新的 UUID。
*
* @param mostSigBits 用于 {@code UUID} 的最高有效 64 位
* @param leastSigBits 用于 {@code UUID} 的最低有效 64 位
*/
public UUID(long mostSigBits, long leastSigBits)
{
this.mostSigBits = mostSigBits;
this.leastSigBits = leastSigBits;
}
/**
* 获取类型 4（伪随机生成的）UUID 的静态工厂。 使用加密的本地线程伪随机数生成器生成该 UUID。
*
* @return 随机生成的 {@code UUID}
*/
public static UUID fastUUID()
{
return randomUUID(false);
}
/**
* 获取类型 4（伪随机生成的）UUID 的静态工厂。 使用加密的强伪随机数生成器生成该 UUID。
*
* @return 随机生成的 {@code UUID}
*/
public static UUID randomUUID()
{
return randomUUID(true);
}
/**
* 获取类型 4（伪随机生成的）UUID 的静态工厂。 使用加密的强伪随机数生成器生成该 UUID。
*
* @param isSecure 是否使用{@link SecureRandom}如果是可以获得更安全的随机码，否则可以得到更好的性能
* @return 随机生成的 {@code UUID}
*/
public static UUID randomUUID(boolean isSecure)
{
final Random ng = isSecure ? Holder.numberGenerator : getRandom();
byte[] randomBytes = new byte[16];
ng.nextBytes(randomBytes);
randomBytes[6] &= 0x0f; /* clear version */
randomBytes[6] |= 0x40; /* set to version 4 */
randomBytes[8] &= 0x3f; /* clear variant */
randomBytes[8] |= 0x80; /* set to IETF variant */
return new UUID(randomBytes);
}
/**
* 根据指定的字节数组获取类型 3（基于名称的）UUID 的静态工厂。
*
* @param name 用于构造 UUID 的字节数组。
*
* @return 根据指定数组生成的 {@code UUID}
*/
public static UUID nameUUIDFromBytes(byte[] name)
{
MessageDigest md;
try
{
md = MessageDigest.getInstance("MD5");
}
catch (NoSuchAlgorithmException nsae)
{
throw new InternalError("MD5 not supported");
}
byte[] md5Bytes = md.digest(name);
md5Bytes[6] &= 0x0f; /* clear version */
md5Bytes[6] |= 0x30; /* set to version 3 */
md5Bytes[8] &= 0x3f; /* clear variant */
md5Bytes[8] |= 0x80; /* set to IETF variant */
return new UUID(md5Bytes);
}
/**
* 根据 {@link #toString()} 方法中描述的字符串标准表示形式创建{@code UUID}。
*
* @param name 指定 {@code UUID} 字符串
* @return 具有指定值的 {@code UUID}
* @throws IllegalArgumentException 如果 name 与 {@link #toString} 中描述的字符串表示形式不符抛出此异常
*
*/
public static UUID fromString(String name)
{
String[] components = name.split("-");
if (components.length != 5)
{
throw new IllegalArgumentException("Invalid UUID string: " + name);
}
for (int i = 0; i < 5; i++)
{
components[i] = "0x" + components[i];
}
long mostSigBits = Long.decode(components[0]).longValue();
mostSigBits <<= 16;
mostSigBits |= Long.decode(components[1]).longValue();
mostSigBits <<= 16;
mostSigBits |= Long.decode(components[2]).longValue();
long leastSigBits = Long.decode(components[3]).longValue();
leastSigBits <<= 48;
leastSigBits |= Long.decode(components[4]).longValue();
return new UUID(mostSigBits, leastSigBits);
}
/**
* 返回此 UUID 的 128 位值中的最低有效 64 位。
*
* @return 此 UUID 的 128 位值中的最低有效 64 位。
*/
public long getLeastSignificantBits()
{
return leastSigBits;
}
/**
* 返回此 UUID 的 128 位值中的最高有效 64 位。
*
* @return 此 UUID 的 128 位值中最高有效 64 位。
*/
public long getMostSignificantBits()
{
return mostSigBits;
}
/**
* 与此 {@code UUID} 相关联的版本号. 版本号描述此 {@code UUID} 是如何生成的。
* <p>
* 版本号具有以下含意:
* <ul>
* <li>1 基于时间的 UUID
* <li>2 DCE 安全 UUID
* <li>3 基于名称的 UUID
* <li>4 随机生成的 UUID
* </ul>
*
* @return 此 {@code UUID} 的版本号
*/
public int version()
{
// Version is bits masked by 0x000000000000F000 in MS long
return (int) ((mostSigBits >> 12) & 0x0f);
}
/**
* 与此 {@code UUID} 相关联的变体号。变体号描述 {@code UUID} 的布局。
* <p>
* 变体号具有以下含意：
* <ul>
* <li>0 为 NCS 向后兼容保留
* <li>2 <a href="http://www.ietf.org/rfc/rfc4122.txt">IETF RFC 4122</a>(Leach-Salz), 用于此类
* <li>6 保留，微软向后兼容
* <li>7 保留供以后定义使用
* </ul>
*
* @return 此 {@code UUID} 相关联的变体号
*/
public int variant()
{
// This field is composed of a varying number of bits.
// 0 - - Reserved for NCS backward compatibility
// 1 0 - The IETF aka Leach-Salz variant (used by this class)
// 1 1 0 Reserved, Microsoft backward compatibility
// 1 1 1 Reserved for future definition.
return (int) ((leastSigBits >>> (64 - (leastSigBits >>> 62))) & (leastSigBits >> 63));
}
/**
* 与此 UUID 相关联的时间戳值。
*
* <p>
* 60 位的时间戳值根据此 {@code UUID} 的 time_low、time_mid 和 time_hi 字段构造。<br>
* 所得到的时间戳以 100 毫微秒为单位，从 UTC（通用协调时间） 1582 年 10 月 15 日零时开始。
*
* <p>
* 时间戳值仅在在基于时间的 UUID（其 version 类型为 1）中才有意义。<br>
* 如果此 {@code UUID} 不是基于时间的 UUID，则此方法抛出 UnsupportedOperationException。
*
* @throws UnsupportedOperationException 如果此 {@code UUID} 不是 version 为 1 的 UUID。
*/
public long timestamp() throws UnsupportedOperationException
{
checkTimeBase();
return (mostSigBits & 0x0FFFL) << 48//
| ((mostSigBits >> 16) & 0x0FFFFL) << 32//
| mostSigBits >>> 32;
}
/**
* 与此 UUID 相关联的时钟序列值。
*
* <p>
* 14 位的时钟序列值根据此 UUID 的 clock_seq 字段构造。clock_seq 字段用于保证在基于时间的 UUID 中的时间唯一性。
* <p>
* {@code clockSequence} 值仅在基于时间的 UUID（其 version 类型为 1）中才有意义。 如果此 UUID 不是基于时间的 UUID，则此方法抛出
* UnsupportedOperationException。
*
* @return 此 {@code UUID} 的时钟序列
*
* @throws UnsupportedOperationException 如果此 UUID 的 version 不为 1
*/
public int clockSequence() throws UnsupportedOperationException
{
checkTimeBase();
return (int) ((leastSigBits & 0x3FFF000000000000L) >>> 48);
}
/**
* 与此 UUID 相关的节点值。
*
* <p>
* 48 位的节点值根据此 UUID 的 node 字段构造。此字段旨在用于保存机器的 IEEE 802 地址，该地址用于生成此 UUID 以保证空间唯一性。
* <p>
* 节点值仅在基于时间的 UUID（其 version 类型为 1）中才有意义。<br>
* 如果此 UUID 不是基于时间的 UUID，则此方法抛出 UnsupportedOperationException。
*
* @return 此 {@code UUID} 的节点值
*
* @throws UnsupportedOperationException 如果此 UUID 的 version 不为 1
*/
public long node() throws UnsupportedOperationException
{
checkTimeBase();
return leastSigBits & 0x0000FFFFFFFFFFFFL;
}
/**
* 返回此{@code UUID} 的字符串表现形式。
*
* <p>
* UUID 的字符串表示形式由此 BNF 描述：
*
* <pre>
* {@code
* UUID = <time_low>-<time_mid>-<time_high_and_version>-<variant_and_sequence>-<node>
* time_low = 4*<hexOctet>
* time_mid = 2*<hexOctet>
* time_high_and_version = 2*<hexOctet>
* variant_and_sequence = 2*<hexOctet>
* node = 6*<hexOctet>
* hexOctet = <hexDigit><hexDigit>
* hexDigit = [0-9a-fA-F]
* }
* </pre>
*
* </blockquote>
*
* @return 此{@code UUID} 的字符串表现形式
* @see #toString(boolean)
*/
@Override
public String toString()
{
return toString(false);
}
/**
* 返回此{@code UUID} 的字符串表现形式。
*
* <p>
* UUID 的字符串表示形式由此 BNF 描述：
*
* <pre>
* {@code
* UUID = <time_low>-<time_mid>-<time_high_and_version>-<variant_and_sequence>-<node>
* time_low = 4*<hexOctet>
* time_mid = 2*<hexOctet>
* time_high_and_version = 2*<hexOctet>
* variant_and_sequence = 2*<hexOctet>
* node = 6*<hexOctet>
* hexOctet = <hexDigit><hexDigit>
* hexDigit = [0-9a-fA-F]
* }
* </pre>
*
* </blockquote>
*
* @param isSimple 是否简单模式，简单模式为不带'-'的UUID字符串
* @return 此{@code UUID} 的字符串表现形式
*/
public String toString(boolean isSimple)
{
final StringBuilder builder = new StringBuilder(isSimple ? 32 : 36);
// time_low
builder.append(digits(mostSigBits >> 32, 8));
if (false == isSimple)
{
builder.append('-');
}
// time_mid
builder.append(digits(mostSigBits >> 16, 4));
if (false == isSimple)
{
builder.append('-');
}
// time_high_and_version
builder.append(digits(mostSigBits, 4));
if (false == isSimple)
{
builder.append('-');
}
// variant_and_sequence
builder.append(digits(leastSigBits >> 48, 4));
if (false == isSimple)
{
builder.append('-');
}
// node
builder.append(digits(leastSigBits, 12));
return builder.toString();
}
/**
* 返回此 UUID 的哈希码。
*
* @return UUID 的哈希码值。
*/
@Override
public int hashCode()
{
long hilo = mostSigBits ^ leastSigBits;
return ((int) (hilo >> 32)) ^ (int) hilo;
}
/**
* 将此对象与指定对象比较。
* <p>
* 当且仅当参数不为 {@code null}、而是一个 UUID 对象、具有与此 UUID 相同的 varriant、包含相同的值（每一位均相同）时，结果才为 {@code true}。
*
* @param obj 要与之比较的对象
*
* @return 如果对象相同，则返回 {@code true}；否则返回 {@code false}
*/
@Override
public boolean equals(Object obj)
{
if ((null == obj) || (obj.getClass() != UUID.class))
{
return false;
}
UUID id = (UUID) obj;
return (mostSigBits == id.mostSigBits && leastSigBits == id.leastSigBits);
}
// Comparison Operations
/**
* 将此 UUID 与指定的 UUID 比较。
*
* <p>
* 如果两个 UUID 不同，且第一个 UUID 的最高有效字段大于第二个 UUID 的对应字段，则第一个 UUID 大于第二个 UUID。
*
* @param val 与此 UUID 比较的 UUID
*
* @return 在此 UUID 小于、等于或大于 val 时，分别返回 -1、0 或 1。
*
*/
@Override
public int compareTo(UUID val)
{
// The ordering is intentionally set up so that the UUIDs
// can simply be numerically compared as two numbers
return (this.mostSigBits < val.mostSigBits ? -1 : //
(this.mostSigBits > val.mostSigBits ? 1 : //
(this.leastSigBits < val.leastSigBits ? -1 : //
(this.leastSigBits > val.leastSigBits ? 1 : //
0))));
}
// -------------------------------------------------------------------------------------------------------------------
// Private method start
/**
* 返回指定数字对应的hex值
*
* @param val 值
* @param digits 位
* @return 值
*/
private static String digits(long val, int digits)
{
long hi = 1L << (digits * 4);
return Long.toHexString(hi | (val & (hi - 1))).substring(1);
}
/**
* 检查是否为time-based版本UUID
*/
private void checkTimeBase()
{
if (version() != 1)
{
throw new UnsupportedOperationException("Not a time-based UUID");
}
}
/**
* 获取{@link SecureRandom}，类提供加密的强随机数生成器 (RNG)
*
* @return {@link SecureRandom}
*/
public static SecureRandom getSecureRandom()
{
try
{
return SecureRandom.getInstance("SHA1PRNG");
}
catch (NoSuchAlgorithmException e)
{
throw new UtilException(e);
}
}
/**
* 获取随机数生成器对象<br>
* ThreadLocalRandom是JDK 7之后提供并发产生随机数，能够解决多个线程发生的竞争争夺。
*
* @return {@link ThreadLocalRandom}
*/
public static ThreadLocalRandom getRandom()
{
return ThreadLocalRandom.current();
}
}
这样就能生成UUID作为唯一标志。在将其存进Redi缓存时添加一个常量类中定义的指定前缀
String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;常量
public static final String CAPTCHA_CODE_KEY = "captcha_codes:";然后将其存储进redis中并设置2分钟有效
redisCache.setCacheObject(verifyKey, verifyCode, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);有效期也是在常量类中定义
public static final Integer CAPTCHA_EXPIRATION = 2;然后下面就是生成图片的操作，调用了验证码工具类VerifyCodeUtils的方法outputImage
工具类全部代码
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.IOException;
import java.io.OutputStream;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Random;
import javax.imageio.ImageIO;
/**
* 验证码工具类
*
*/
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 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZ";
private static Random random = new SecureRandom();
/**
* 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();
}
/**
* 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);
}
}
}
}然后就是将图片使用Base64编码，这里也调用了Base64工具类,全部代码
/**
* Base64工具类
*
*/
public final class Base64
{
static private final int BASELENGTH = 128;
static private final int LOOKUPLENGTH = 64;
static private final int TWENTYFOURBITGROUP = 24;
static private final int EIGHTBIT = 8;
static private final int SIXTEENBIT = 16;
static private final int FOURBYTE = 4;
static private final int SIGN = -128;
static private final char PAD = '=';
static final private byte[] base64Alphabet = new byte[BASELENGTH];
static final private char[] lookUpBase64Alphabet = new char[LOOKUPLENGTH];
static
{
for (int i = 0; i < BASELENGTH; ++i)
{
base64Alphabet[i] = -1;
}
for (int i = 'Z'; i >= 'A'; i--)
{
base64Alphabet[i] = (byte) (i - 'A');
}
for (int i = 'z'; i >= 'a'; i--)
{
base64Alphabet[i] = (byte) (i - 'a' + 26);
}
for (int i = '9'; i >= '0'; i--)
{
base64Alphabet[i] = (byte) (i - '0' + 52);
}
base64Alphabet['+'] = 62;
base64Alphabet['/'] = 63;
for (int i = 0; i <= 25; i++)
{
lookUpBase64Alphabet[i] = (char) ('A' + i);
}
for (int i = 26, j = 0; i <= 51; i++, j++)
{
lookUpBase64Alphabet[i] = (char) ('a' + j);
}
for (int i = 52, j = 0; i <= 61; i++, j++)
{
lookUpBase64Alphabet[i] = (char) ('0' + j);
}
lookUpBase64Alphabet[62] = (char) '+';
lookUpBase64Alphabet[63] = (char) '/';
}
private static boolean isWhiteSpace(char octect)
{
return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
}
private static boolean isPad(char octect)
{
return (octect == PAD);
}
private static boolean isData(char octect)
{
return (octect < BASELENGTH && base64Alphabet[octect] != -1);
}
/**
* Encodes hex octects into Base64
*
* @param binaryData Array containing binaryData
* @return Encoded Base64 array
*/
public static String encode(byte[] binaryData)
{
if (binaryData == null)
{
return null;
}
int lengthDataBits = binaryData.length * EIGHTBIT;
if (lengthDataBits == 0)
{
return "";
}
int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets;
char encodedData[] = null;
encodedData = new char[numberQuartet * 4];
byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
int encodedIndex = 0;
int dataIndex = 0;
for (int i = 0; i < numberTriplets; i++)
{
b1 = binaryData[dataIndex++];
b2 = binaryData[dataIndex++];
b3 = binaryData[dataIndex++];
l = (byte) (b2 & 0x0f);
k = (byte) (b1 & 0x03);
byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);
encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3];
encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];
}
// form integral number of 6-bit groups
if (fewerThan24bits == EIGHTBIT)
{
b1 = binaryData[dataIndex];
k = (byte) (b1 & 0x03);
byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4];
encodedData[encodedIndex++] = PAD;
encodedData[encodedIndex++] = PAD;
}
else if (fewerThan24bits == SIXTEENBIT)
{
b1 = binaryData[dataIndex];
b2 = binaryData[dataIndex + 1];
l = (byte) (b2 & 0x0f);
k = (byte) (b1 & 0x03);
byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];
encodedData[encodedIndex++] = PAD;
}
return new String(encodedData);
}
/**
* Decodes Base64 data into octects
*
* @param encoded string containing Base64 data
* @return Array containind decoded data.
*/
public static byte[] decode(String encoded)
{
if (encoded == null)
{
return null;
}
char[] base64Data = encoded.toCharArray();
// remove white spaces
int len = removeWhiteSpace(base64Data);
if (len % FOURBYTE != 0)
{
return null;// should be divisible by four
}
int numberQuadruple = (len / FOURBYTE);
if (numberQuadruple == 0)
{
return new byte[0];
}
byte decodedData[] = null;
byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
char d1 = 0, d2 = 0, d3 = 0, d4 = 0;
int i = 0;
int encodedIndex = 0;
int dataIndex = 0;
decodedData = new byte[(numberQuadruple) * 3];
for (; i < numberQuadruple - 1; i++)
{
if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))
|| !isData((d3 = base64Data[dataIndex++])) || !isData((d4 = base64Data[dataIndex++])))
{
return null;
} // if found "no data" just return null
b1 = base64Alphabet[d1];
b2 = base64Alphabet[d2];
b3 = base64Alphabet[d3];
b4 = base64Alphabet[d4];
decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
}
if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++])))
{
return null;// if found "no data" just return null
}
b1 = base64Alphabet[d1];
b2 = base64Alphabet[d2];
d3 = base64Data[dataIndex++];
d4 = base64Data[dataIndex++];
if (!isData((d3)) || !isData((d4)))
{// Check if they are PAD characters
if (isPad(d3) && isPad(d4))
{
if ((b2 & 0xf) != 0)// last 4 bits should be zero
{
return null;
}
byte[] tmp = new byte[i * 3 + 1];
System.arraycopy(decodedData, 0, tmp, 0, i * 3);
tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
return tmp;
}
else if (!isPad(d3) && isPad(d4))
{
b3 = base64Alphabet[d3];
if ((b3 & 0x3) != 0)// last 2 bits should be zero
{
return null;
}
byte[] tmp = new byte[i * 3 + 2];
System.arraycopy(decodedData, 0, tmp, 0, i * 3);
tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
return tmp;
}
else
{
return null;
}
}
else
{ // No PAD e.g 3cQl
b3 = base64Alphabet[d3];
b4 = base64Alphabet[d4];
decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
}
return decodedData;
}
/**
* remove WhiteSpace from MIME containing encoded Base64 data.
*
* @param data the byte array of base64 data (with WS)
* @return the new length
*/
private static int removeWhiteSpace(char[] data)
{
if (data == null)
{
return 0;
}
// count characters that's not whitespace
int newSize = 0;
int len = data.length;
for (int i = 0; i < len; i++)
{
if (!isWhiteSpace(data[i]))
{
data[newSize++] = data[i];
}
}
return newSize;
}
}这样验证码接口就会把UUID和验证码都返回给前端。
其中AjaxResult是自定义响应结果类
import java.util.HashMap;
import com.ruoyi.common.constant.HttpStatus;
import com.ruoyi.common.utils.StringUtils;
/**
* 操作消息提醒
*
*/
public class AjaxResult extends HashMap<String, Object>
{
private static final long serialVersionUID = 1L;
/** 状态码 */
public static final String CODE_TAG = "code";
/** 返回内容 */
public static final String MSG_TAG = "msg";
/** 数据对象 */
public static final String DATA_TAG = "data";
/**
* 初始化一个新创建的 AjaxResult 对象，使其表示一个空消息。
*/
public AjaxResult()
{
}
/**
* 初始化一个新创建的 AjaxResult 对象
*
* @param code 状态码
* @param msg 返回内容
*/
public AjaxResult(int code, String msg)
{
super.put(CODE_TAG, code);
super.put(MSG_TAG, msg);
}
/**
* 初始化一个新创建的 AjaxResult 对象
*
* @param code 状态码
* @param msg 返回内容
* @param data 数据对象
*/
public AjaxResult(int code, String msg, Object data)
{
super.put(CODE_TAG, code);
super.put(MSG_TAG, msg);
if (StringUtils.isNotNull(data))
{
super.put(DATA_TAG, data);
}
}
/**
* 返回成功消息
*
* @return 成功消息
*/
public static AjaxResult success()
{
return AjaxResult.success("操作成功");
}
/**
* 返回成功数据
*
* @return 成功消息
*/
public static AjaxResult success(Object data)
{
return AjaxResult.success("操作成功", data);
}
/**
* 返回成功消息
*
* @param msg 返回内容
* @return 成功消息
*/
public static AjaxResult success(String msg)
{
return AjaxResult.success(msg, null);
}
/**
* 返回成功消息
*
* @param msg 返回内容
* @param data 数据对象
* @return 成功消息
*/
public static AjaxResult success(String msg, Object data)
{
return new AjaxResult(HttpStatus.SUCCESS, msg, data);
}
/**
* 返回错误消息
*
* @return
*/
public static AjaxResult error()
{
return AjaxResult.error("操作失败");
}
/**
* 返回错误消息
*
* @param msg 返回内容
* @return 警告消息
*/
public static AjaxResult error(String msg)
{
return AjaxResult.error(msg, null);
}
/**
* 返回错误消息
*
* @param msg 返回内容
* @param data 数据对象
* @return 警告消息
*/
public static AjaxResult error(String msg, Object data)
{
return new AjaxResult(HttpStatus.ERROR, msg, data);
}
/**
* 返回错误消息
*
* @param code 状态码
* @param msg 返回内容
* @return 警告消息
*/
public static AjaxResult error(int code, String msg)
{
return new AjaxResult(code, msg, null);
}
}
然后在登录接口中
String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;
String captcha = redisCache.getCacheObject(verifyKey);
redisCache.deleteObject(verifyKey);
if (captcha == null)
{
AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.jcaptcha.expire")));
throw new CaptchaExpireException();
}获取前端传递的uuid并加上同样的前缀，去缓存中查询，并且从缓存中删除，如果查不出来则返回验证码失效。
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