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笔记来自《小滴课堂-新版Redis6学习笔记》
第2集 案例实战之企业级-验证码存储Redis和工具类介绍
简介：验证码存储Redis逻辑编码实战
- CommonUtil工具类
/**
* 获取ip
* @param request
* @return
*/
public static String getIpAddr(HttpServletRequest request) {
String ipAddress = null;
try {
ipAddress = request.getHeader("x-forwarded-for");
if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
ipAddress = request.getHeader("Proxy-Client-IP");
}
if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
ipAddress = request.getHeader("WL-Proxy-Client-IP");
}
if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
ipAddress = request.getRemoteAddr();
if (ipAddress.equals("127.0.0.1")) {
// 根据网卡取本机配置的IP
InetAddress inet = null;
try {
inet = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
e.printStackTrace();
}
ipAddress = inet.getHostAddress();
}
}
// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
if (ipAddress != null && ipAddress.length() > 15) {
// "***.***.***.***".length()
// = 15
if (ipAddress.indexOf(",") > 0) {
ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
}
}
} catch (Exception e) {
ipAddress="";
}
return ipAddress;
}
public static String MD5(String data) {
try {
java.security.MessageDigest md = MessageDigest.getInstance("MD5");
byte[] array = md.digest(data.getBytes("UTF-8"));
StringBuilder sb = new StringBuilder();
for (byte item : array) {
sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
}
return sb.toString().toUpperCase();
} catch (Exception exception) {
}
return null;
}
- 接口开发
@Autowired
private StringRedisTemplate redisTemplate;
@Autowired
private Producer captchaProducer;
/**
*临时使用10分钟有效，方便测试
*/
private static final long CAPTCHA_CODE_EXPIRED = 60 * 1000 * 10;
/**
* 获取图形验证码
* @param request
* @param response
*/
@GetMapping("captcha")
public void getCaptcha(HttpServletRequest request, HttpServletResponse response){
String captchaText = captchaProducer.createText();
//存储
redisTemplate.opsForValue().set(getCaptchaKey(request),captchaText,CAPTCHA_CODE_EXPIRED,TimeUnit.MILLISECONDS);
BufferedImage bufferedImage = captchaProducer.createImage(captchaText);
ServletOutputStream outputStream = null;
try {
outputStream = response.getOutputStream();
ImageIO.write(bufferedImage,"jpg",outputStream);
outputStream.flush();
outputStream.close();
} catch (IOException e) {
}
}
/**
* 获取缓存的key
* @param request
* @return
*/
private String getCaptchaKey(HttpServletRequest request){
String ip = CommonUtils.getIpAddr(request);
String userAgent = request.getHeader("User-Agent");
String key = "user-service:captcha:"+CommonUtils.MD5(ip+userAgent);
return key;
}
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