Java怎么实现登录验证码保存到redis
这篇文章主要介绍"Java怎么实现登录验证码保存到redis"，在日常操作中，相信很多人在Java怎么实现登录验证码保存到redis问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"Java怎么实现登录验证码保存到redis"的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
引入redis依赖
验证码生成类
package com.yishang.yspay.util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import java.awt.*;
import java.util.Random;
/**
* 验证码生成类
*/
public class RandomValidateCode {
public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";//放到session中的key
//private String randString = "0123456789";//随机产生只有数字的字符串 private String
//private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串
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 = 25;// 图片高
private int lineSize = 10;// 干扰线数量
private int stringNum = 4;// 随机产生字符数量
/**
* redis工具
*/
@Autowired
private RedisTemplate
private Random random = new Random();
/*
* 获得字体
*/
private Font getFont() {
return new Font("Fixedsys", Font.CENTER_BASELINE, 24);
}
/*
* 获得颜色
*/
public Color getRandColor(int fc, int bc) {
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc - 16);
int g = fc + random.nextInt(bc - fc - 14);
int b = fc + random.nextInt(bc - fc - 18);
return new Color(r, g, b);
}
/*
* 绘制字符串
*/
public String drowString(Graphics g, String randomString, int i) {
g.setFont(getFont());
g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
.nextInt(121)));
String rand = String.valueOf(getRandomString(random.nextInt(randString
.length())));
randomString += rand;
g.translate(random.nextInt(3), random.nextInt(3));
g.drawString(rand, 13 * i, 16);
return randomString;
}
/*
* 绘制干扰线
*/
public void drowLine(Graphics g) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(13);
int yl = random.nextInt(15);
g.drawLine(x, y, x + xl, y + yl);
}
/*
* 获取随机的字符
*/
public String getRandomString(int num) {
return String.valueOf(randString.charAt(num));
}
}
接口
@RequestMapping(value = "/getVerify")
public void getVerify(HttpServletRequest request, HttpServletResponse response) {
response.setContentType("image/jpeg");//设置相应类型,告诉浏览器输出的内容为图片
response.setHeader("Pragma", "No-cache");//设置响应头信息，告诉浏览器不要缓存此内容
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expire", 0);
RandomValidateCode randomValidateCode = new RandomValidateCode();
// 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(95, 25, 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, 95, 25);
g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
g.setColor(randomValidateCode.getRandColor(110, 133));
// 绘制干扰线
for (int i = 0; i <= 40; i++) {
randomValidateCode.drowLine(g);
}
// 绘制随机字符
String randomString = "";
for (int i = 1; i <= 4; i++) {
randomString = randomValidateCode.drowString(g, randomString, i);
}
// 生产验证码字符串并保存到 Redis 中，ip-rightCode，有效期为 1 小时
String ip = request.getRemoteAddr();
logger.info("ip：" + ip + "，rightCode = " + randomString);
redisTemplate.opsForValue().set(ip, randomString, 20, TimeUnit.SECONDS);
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) {
e.printStackTrace();
}
}
效果
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