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全局token验证

简介

​通俗地说，JWT的本质就是一个字符串，它是将用户信息保存到一个Json字符串中，然后进行编码后得到一个JWT token，并且这个JWT token带有签名信息，接收后可以校验是否被篡改，所以可以用于在各方之间安全地将信息作为Json对象传输。JWT的认证流程如下：

前端通过Web表单将自己的用户名和密码发送到后端的接口，这个过程一般是一个POST请求。建议的方式是通过SSL加密的传输(HTTPS)，从而避免敏感信息被嗅探

后端核对用户名和密码成功后，将包含用户信息的数据作为JWT的Payload，将其与JWT Header分别进行Base64编码拼接后签名，形成一个JWT Token，形成的JWT Token就是一个如同lll.zzz.xxx的字符串

由一下可以实现全局的token验证，无需再其余地方进行验证token。

jwt实现

public class AppJwtUtil {// TOKEN的有效期一天（S）private static final int TOKEN_TIME_OUT = 3_600;// 加密KEYprivate static final String TOKEN_ENCRY_KEY = "MDk4ZjZiY2Q0NjIxZDM3M2NhZGU0ZTgzMjYyN2I0ZjY";// 最小刷新间隔(S)private static final int REFRESH_TIME = 300;// 生产IDpublic static String getToken(Long id){Map<String, Object> claimMaps = new HashMap<>();claimMaps.put("id",id);long currentTime = System.currentTimeMillis();return Jwts.builder().setId(UUID.randomUUID().toString()).setIssuedAt(new Date(currentTime))  //签发时间.setSubject("short-chain")  //说明.setIssuer("zh") //签发者信息.setAudience("app")  //接收用户.compressWith(CompressionCodecs.GZIP)  //数据压缩方式.signWith(SignatureAlgorithm.HS512, generalKey()) //加密方式.setExpiration(new Date(currentTime + TOKEN_TIME_OUT * 1000))  //过期时间戳.addClaims(claimMaps) //cla信息.compact();}//临时tokenpublic static String getToken( ){Map<String, Object> claimMaps = new HashMap<>();long currentTime = System.currentTimeMillis();return Jwts.builder().setId(UUID.randomUUID().toString()).setIssuedAt(new Date(currentTime))  //签发时间.setSubject("short-chain")  //说明.setIssuer("zh") //签发者信息.setAudience("app")  //接收用户.compressWith(CompressionCodecs.GZIP)  //数据压缩方式.signWith(SignatureAlgorithm.HS512, generalKey()) //加密方式.setExpiration(new Date(currentTime + TOKEN_TIME_OUT/60 ))  //过期时间戳.addClaims(claimMaps) //cla信息.compact();}public static String getAppkey( ){Map<String, Object> claimMaps = new HashMap<>();long currentTime = System.currentTimeMillis();return Jwts.builder().setId(UUID.randomUUID().toString()).setIssuedAt(new Date(currentTime))  //签发时间.setSubject("short-chain")  //说明.setIssuer("zh") //签发者信息.setAudience("app")  //接收用户.compressWith(CompressionCodecs.GZIP)  //数据压缩方式.signWith(SignatureAlgorithm.HS512, generalKey()) //加密方式.setExpiration(new Date(currentTime + TOKEN_TIME_OUT*60000000000L ))  //过期时间戳.addClaims(claimMaps) //cla信息.compact();}/*** 获取token中的claims信息** @param token* @return*/private static Jws<Claims> getJws(String token) {return Jwts.parser().setSigningKey(generalKey()).parseClaimsJws(token);}/*** 获取payload body信息** @param token* @return*/public static Claims getClaimsBody(String token) {try {return getJws(token).getBody();}catch (ExpiredJwtException e){return null;}}/*** 获取hearder body信息** @param token* @return*/public static JwsHeader getHeaderBody(String token) {return getJws(token).getHeader();}/*** 是否过期** @param claims* @return -1：有效，0：有效，1：过期，2：过期*/public static int verifyToken(Claims claims) {if(claims==null){return 1;}try {claims.getExpiration().before(new Date());// 需要自动刷新TOKENif((claims.getExpiration().getTime()-System.currentTimeMillis())>REFRESH_TIME*1000){return -1;}else {return 0;}} catch (ExpiredJwtException ex) {return 1;}catch (Exception e){return 2;}}/*** 由字符串生成加密key** @return*/public static SecretKey generalKey() {byte[] encodedKey = Base64.getEncoder().encode(TOKEN_ENCRY_KEY.getBytes());SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");return key;}public static void main(String[] args) {/* Map map = new HashMap();map.put("id","11");*/System.out.println(AppJwtUtil.getToken(1102L));Jws<Claims> jws = AppJwtUtil.getJws("eyJhbGciOiJIUzUxMiIsInppcCI6IkdaSVAifQ.H4sIAAAAAAAAADWLQQqEMAwA_5KzhURNt_qb1KZYQSi0wi6Lf9942NsMw3zh6AVW2DYmDGl2WabkZgreCaM6VXzhFBfJMcMARTqsxIG9Z888QLui3e3Tup5Pb81013KKmVzJTGo11nf9n8v4nMUaEY73DzTabjmDAAAA.4SuqQ42IGqCgBai6qd4RaVpVxTlZIWC826QA9kLvt9d-yVUw82gU47HDaSfOzgAcloZedYNNpUcd18Ne8vvjQA");Claims claims = jws.getBody();System.out.println(claims.get("id"));}}

拦截器

/*** @Description:* @author: zh* @Create : 2024/11/26* @Project_name : short-chain* @Version :**/
@Component
@Slf4j
public class TokenValidationInterceptor implements HandlerInterceptor {private static final String[] filters =  {"Login","swagger","swagger-ui","webjars","api-docs","doc.html","getToken"};/*** 验证token是否有效* @param request* @param response* @param handler* @return* @throws Exception*/@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {String servletPath = request.getServletPath();for(String filter:filters){if(servletPath.contains(filter)){return true;}}// 获取请求头中的TokenString token = request.getHeader("Authorization");if (token == null || !isValidToken(token)) {// 如果Token无效，返回401未授权状态码response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
//            response.getWriter().write("Invalid or missing token");return false; // 阻止请求继续处理}return true;}private boolean isValidToken(String token) {int i = AppJwtUtil.verifyToken(AppJwtUtil.getClaimsBody(token));return i==2?false:true;}
}

配置拦截

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new TokenValidationInterceptor())// 拦截的路径.addPathPatterns("/**")// 开放的路径.excludePathPatterns("/login", "/getToken");}
}