1. 编写工具类
package com.cn.beauty.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.Random;
public class RandomValidateCodeUtil {
public static final String RANDOMCODEKEY = "MEISHANG-LOGIN-RANDOMVALIDATECODEKEY";//放到session中的key
private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
private int width = 95;// 图片宽
private int height = 40;// 图片高
private int stringNum = 4;// 随机产生字符数量
private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);
private Random random = new Random();
/**
* 获得字体
*/
private Font getFont() {
return new Font("Wide Latin", Font.PLAIN, 18);
}
/**
* 获得颜色(粉色为主)
*/
private Color getRandColor() {
ArrayList<Color> colors = new ArrayList<Color>();
colors.add(new Color(241, 158, 194));
colors.add(new Color(255, 94, 226));
colors.add(new Color(255, 156, 177));
colors.add(new Color(245, 152, 217));
colors.add(new Color(255, 85, 81));
colors.add(new Color(245, 152, 251));
int num = random.nextInt(6);
return colors.get(num);
}
/**
* 生成随机图片
*/
public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
HttpSession session = request.getSession();
// BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
g.fillRect(0, 0, width, height);//图片大小
g.setFont(new Font("Wide Latin", Font.PLAIN, 18));//字体大小
g.setColor(getRandColor());//字体颜色
// 添加噪点
float yawpRate = 0.01f;// 噪声率
int area = (int) (yawpRate * width * height);
for (int i = 0; i < area; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
image.setRGB(x, y, random.nextInt(255));
}
// 绘制随机字符
String randomString = "";
for (int i = 1; i <= stringNum; i++) {
randomString = drowString(g, randomString, i);
}
logger.info(randomString);
//将生成的随机字符串保存到session中
session.removeAttribute(RANDOMCODEKEY);
session.setAttribute(RANDOMCODEKEY, randomString);
g.dispose();
try {
// 将内存中的图片通过流动形式输出到客户端
ImageIO.write(image, "JPEG", response.getOutputStream());
} catch (Exception e) {
logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e);
}
}
/**
* 绘制字符串
*/
private String drowString(Graphics g, String randomString, int i) {
g.setFont(getFont());
g.setColor(getRandColor());
String rand = String.valueOf(getRandomString(random.nextInt(randString
.length())));
randomString += rand;
g.translate(random.nextInt(3), random.nextInt(3));
g.drawString(rand, 20 * (i - 1) + 3, 25);
return randomString;
}
/**
* 获取随机的字符
*/
public String getRandomString(int num) {
return String.valueOf(randString.charAt(num));
}
}
2. 编写 Controller 中的接口
/**
* @description 生成验证码
*/
@RequestMapping(value = "/user/getVerify")
public void getVerify(HttpServletRequest request, HttpServletResponse response) {
try {
//设置相应类型,告诉浏览器输出的内容为图片
response.setContentType("image/jpeg");
//设置响应头信息，告诉浏览器不要缓存此内容
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expire", 0);
RandomValidateCodeUtil randomValidateCode = new RandomValidateCodeUtil();
//输出验证码图片方法
randomValidateCode.getRandcode(request, response);
} catch (Exception e) {
log.error("获取验证码失败>>>>", e);
}
}
/**
* @description 校验验证码
*/
@PostMapping("/user/checkVerify")
public boolean checkVerify(@RequestParam String verifyInput, HttpSession session) {
try {
// 从session中获取随机数
String inputStr = verifyInput;
String random = (String) session.getAttribute("MEISHANG-LOGIN-RANDOMVALIDATECODEKEY");
if (random == null) {
return false;
}
if (random.equalsIgnoreCase(inputStr)) {
return true;
} else {
return false;
}
} catch (Exception e) {
log.error("验证码校验失败", e);
return false;
}
}
3. 获取验证码图片
访问获取验证码接口
http://127.0.0.1:8605/user/getVerify
效果如下
