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top.doudou.common.tool.utils.verify.VerifyCodeImageUtil Maven / Gradle / Ivy
package top.doudou.common.tool.utils.verify;
import lombok.extern.slf4j.Slf4j;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
/**
* @Author: 傻男人
* @Date: 2020/10/21 10:01
* @Version: 1.0
* @Description: 验证码工具类
*/
@Slf4j
public class VerifyCodeImageUtil {
/**
* 验证码类型为仅数字,即0~9
*/
public static final int TYPE_NUM_ONLY = 0;
/**
* 验证码类型为仅字母,即大小写字母混合
*/
public static final int TYPE_LETTER_ONLY = 1;
/**
* 验证码类型为数字和大小写字母混合
*/
public static final int TYPE_ALL_MIXED = 2;
/**
* 验证码类型为数字和大写字母混合
*/
public static final int TYPE_NUM_UPPER = 3;
/**
* 验证码类型为数字和小写字母混合
*/
public static final int TYPE_NUM_LOWER = 4;
/**
* 验证码类型为仅大写字母
*/
public static final int TYPE_UPPER_ONLY = 5;
/**
* 验证码类型为仅小写字母
*/
public static final int TYPE_LOWER_ONLY = 6;
/**
* 获取验证码图片和文本(验证码文本会保存在HttpSession中)
* @param request
* @param response
* @param type
* @param len
* @param imageCodeProperty
* @return HttpSession中验证码的缓存key
* @throws IOException
*/
public static String getVerifyCodeImage(HttpServletRequest request, HttpServletResponse response,int type,int len,ImageCodeProperty imageCodeProperty) throws IOException {
String VERIFY_CODE = "verifyCode";
//设置页面不缓存
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.getOutputStream();
String verifyCode = VerifyCodeImageUtil.generateTextCode(type, len, null);
//将验证码放到HttpSession里面
request.getSession().setAttribute(VERIFY_CODE, verifyCode);
log.debug("本次生成的验证码为[" + verifyCode + "],已存放到HttpSession中");
//设置输出的内容的类型为JPEG图像
response.setContentType("image/jpeg");
BufferedImage bufferedImage = VerifyCodeImageUtil.generateImageCode(verifyCode, imageCodeProperty);
//写给浏览器
ImageIO.write(bufferedImage, "JPEG", response.getOutputStream());
return VERIFY_CODE;
}
/**
* 生成随机颜色
*/
public static Color generateRandomColor() {
Random random = new Random();
return new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));
}
/**
* 生成图片验证码
*
* @param type 验证码类型,参见本类的静态属性
* @param length 验证码字符长度,要求大于0的整数
* @param excludeString 需排除的特殊字符
* @param imageCodeProperty 验证码属性
* @return 图片缓存对象
*/
public static BufferedImage generateImageCode(int type, int length, String excludeString,ImageCodeProperty imageCodeProperty) {
String textCode = generateTextCode(type, length, excludeString);
return generateImageCode(textCode,imageCodeProperty);
}
/**
* 生成验证码字符串
*
* @param type 验证码类型,参见本类的静态属性
* @param length 验证码长度,要求大于0的整数
* @param excludeString 需排除的特殊字符（无需排除则为null）
* @return 验证码字符串
*/
public static String generateTextCode(int type, int length, String excludeString) {
if (length <= 0) {
return "";
}
StringBuilder verifyCode = new StringBuilder();
int i = 0;
Random random = new Random();
switch (type) {
case TYPE_NUM_ONLY:
while (i < length) {
int t = random.nextInt(10);
//排除特殊字符
if (null == excludeString || !excludeString.contains(t + "")) {
verifyCode.append(t);
i++;
}
}
break;
case TYPE_LETTER_ONLY:
while (i < length) {
int t = random.nextInt(123);
if ((t >= 97 || (t >= 65 && t <= 90)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) {
verifyCode.append((char) t);
i++;
}
}
break;
case TYPE_ALL_MIXED:
while (i < length) {
int t = random.nextInt(123);
if ((t >= 97 || (t >= 65 && t <= 90) || (t >= 48 && t <= 57)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) {
verifyCode.append((char) t);
i++;
}
}
break;
case TYPE_NUM_UPPER:
while (i < length) {
int t = random.nextInt(91);
if ((t >= 65 || (t >= 48 && t <= 57)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) {
verifyCode.append((char) t);
i++;
}
}
break;
case TYPE_NUM_LOWER:
while (i < length) {
int t = random.nextInt(123);
if ((t >= 97 || (t >= 48 && t <= 57)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) {
verifyCode.append((char) t);
i++;
}
}
break;
case TYPE_UPPER_ONLY:
while (i < length) {
int t = random.nextInt(91);
if ((t >= 65) && (null == excludeString || excludeString.indexOf((char) t) < 0)) {
verifyCode.append((char) t);
i++;
}
}
break;
case TYPE_LOWER_ONLY:
while (i < length) {
int t = random.nextInt(123);
if ((t >= 97) && (null == excludeString || excludeString.indexOf((char) t) < 0)) {
verifyCode.append((char) t);
i++;
}
}
break;
default:
throw new IllegalStateException("Unexpected value: " + type);
}
return verifyCode.toString();
}
/**
* 已有验证码,生成验证码图片
*
* @param textCode 文本验证码
* @param imageCodeProperty 验证码属性
* @return 图片缓存对象
*/
public static BufferedImage generateImageCode(String textCode,ImageCodeProperty imageCodeProperty) {
int width = imageCodeProperty.getWidth();
int height = imageCodeProperty.getHeight();
Color backColor = imageCodeProperty.getBackColor();
int interLine = imageCodeProperty.getInterLine();
Color lineColor = imageCodeProperty.getLineColor();
boolean randomLocation = imageCodeProperty.isRandomLocation();
Color foreColor = imageCodeProperty.getForeColor();
//创建内存图像
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//获取图形上下文
Graphics graphics = bufferedImage.getGraphics();
//画背景图
graphics.setColor(null == backColor ? generateRandomColor() : backColor);
graphics.fillRect(0, 0, width, height);
//画干扰线
Random random = new Random();
if (interLine > 0) {
int x = 0, y, y1;
for (int i = 0; i < interLine; i++) {
graphics.setColor(null == lineColor ? generateRandomColor() : lineColor);
y = random.nextInt(height);
y1 = random.nextInt(height);
graphics.drawLine(x, y, width, y1);
}
}
//字体大小为图片高度的80%
int fsize = (int) (height * 0.8);
int fx = height - fsize;
int fy = fsize;
//设定字体
graphics.setFont(new Font("Default", Font.PLAIN, fsize));
//写验证码字符
for (int i = 0; i < textCode.length(); i++) {
fy = randomLocation ? (int) ((Math.random() * 0.3 + 0.6) * height) : fy;
graphics.setColor(null == foreColor ? generateRandomColor() : foreColor);
//将验证码字符显示到图象中
graphics.drawString(textCode.charAt(i) + "", fx, fy);
fx += fsize * 0.9;
}
graphics.dispose();
return bufferedImage;
}
}
