以下是自己手动写的小demo，有需要的朋友可以 ctrl+c ctrl+v
1、pom.xml 依赖引用
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.belerweb</groupId>
<artifactId>pinyin4j</artifactId>
<version>2.5.0</version>
</dependency>
2、VerifyCodeController 调用服务
@GetMapping("vc/out")
public void out(HttpServletRequest request, HttpServletResponse response) {
try {
// 设置浏览器不缓存本页
response.addHeader("Pragma", "no-cache");
response.addHeader("Cache-Control", "no-cache");
response.addHeader("Expires", "0");
response.setContentType("image/jpeg");
// 生成验证码，写入用户session
String[] cnCodes = CnVerifyCode.random4CommonCn();
request.getSession().setAttribute("cnCode", cnCodes[cnCodes.length - 1]);
//输出图片流
BufferedImage bim = CnVerifyCode.getImg(cnCodes);
ImageIO.write(bim, "JPEG", response.getOutputStream());
} catch (Exception e) {
e.printStackTrace();
}
}
3、CnVerifyCode 核心代码
public class CnVerifyCode {
private static final String COMMON_CN = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";
private static final int WIDTH = 160;
private static final int HEIGHT = 50;
private static final Color BG_COLOR = Color.WHITE;
//画笔的粗度
private static final Stroke STROKE = new BasicStroke(1.5f);
/**
* 输出图片
*
* @Author liuxin
* @Date 2020/9/16
*/
public static BufferedImage getImg(String[] cnCodes) {
int[] randomNums = randomNums(4);
//start
BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) image.getGraphics();
//绘制背景
g.setColor(BG_COLOR);
g.fillRect(0, 0, WIDTH, HEIGHT);
//写验证码
//字体大小为图片高度的80%
//##################### 写字符
Color color = null;
for (int i = 0; i < cnCodes.length - 1; i++) {
Font font = new Font(Font.SERIF, randomNums[i] % 3 + 1, HEIGHT * 7 / 10 - randomNums[i]);
color = new Color(111 - randomNums[i] * 3, 222 - randomNums[i] * 5, 111 - randomNums[i] * 3);
//原点平移 》 旋转 》 复位
g.translate(WIDTH * i / 4 + WIDTH / 8, HEIGHT / 2);
double rotateValue = Math.PI / 6 * (randomNums[i] % 2 * -2 + 1) + randomNums[i] / 20;
g.rotate(rotateValue);
g.translate(WIDTH * i / -4 - WIDTH / 8, HEIGHT / -2);
g.setFont(font);
g.setColor(color);
if (i % 2 == 0) {
g.drawString(cnCodes[i], WIDTH * i / 4 + 5, HEIGHT * 8 / 10);
} else {
g.drawString(cnCodes[i], WIDTH * i / 4 - 5, HEIGHT * 8 / 10);
}
//原点平移 》 反旋转 》 复位
g.translate(WIDTH * i / 4 + WIDTH / 8, HEIGHT / 2);
g.rotate(rotateValue * -1);
g.translate(WIDTH * i / -4 - WIDTH / 8, HEIGHT / -2);
}
//#####################
//干扰线
g.setStroke(STROKE);
g.setColor(color);
if (randomNums[0] % 2 == 0) {
g.drawOval(-1 * randomNums[2], HEIGHT * 4 / 10 + randomNums[0], WIDTH - 5, HEIGHT);
} else {
g.drawOval(-1 * randomNums[2], -1 * HEIGHT * 5 / 10 + randomNums[0], WIDTH - 5, HEIGHT);
}
//扭曲图片
//噪点
//end
g.dispose();
return image;
}
/**
* 随机获取四个 常用 汉字
* 最后一个 index 是 总字符
*
* @Author liuxin
* @Date 2020/9/16
*/
public static String[] random4CommonCn() {
String[] r = new String[5];
Random random = new Random();
//最多拼音数
int pinyinCount = 1;
//输出字符数
StringBuilder strb = new StringBuilder();
for (int i = 0; i < r.length - 1; i++) {
String cn = CnVerifyCode.COMMON_CN.charAt(random.nextInt(CnVerifyCode.COMMON_CN.length())) + "";
if (pinyinCount > 0 && random.nextInt(99) % 2 == 0) {
String pinyin = toPinyin(cn);
if (pinyin.length() <= 2) {
pinyinCount--;
r[i] = pinyin;
strb.append(pinyin);
continue;
}
}
r[i] = cn;
strb.append(cn);
}
r[r.length - 1] = strb.toString();
return r;
}
/**
* 汉字转为拼音
*
* @param chinese
* @return
*/
public static String toPinyin(String chinese) {
StringBuilder strb = new StringBuilder();
char[] newChar = chinese.toCharArray();
HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);
defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
for (int i = 0; i < newChar.length; i++) {
try {
strb.append(newChar[i] > 128 ? PinyinHelper.toHanyuPinyinStringArray(newChar[i], defaultFormat)[0] : newChar[i]);
} catch (BadHanyuPinyinOutputFormatCombination e) {
e.printStackTrace();
}
}
return strb.toString();
}
/**
* 获取指定数量的 0~9随机数 数组
*
* @Author liuxin
* @Date 2020/9/17
*/
private static int[] randomNums(int len) {
int[] result = new int[len];
int max = 1;
for (int i = 0; i < len; i++) {
max *= 10;
}
Random random = new Random();
int num = random.nextInt((max - max / 10 - 1)) + max / 10;
for (int i = 0; i < len; i++) {
max = max / 10;
result[i] = num / max;
num = num % max;
}
return result;
}
}
