springboot+jwt實現(xiàn)token登陸權(quán)限認證的代碼解析

<dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
   <groupId>com.auth0</groupId>
   <artifactId>java-jwt</artifactId>
   <version>3.4.0</version>
  </dependency>
  <dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <optional>true</optional>
  </dependency>
 </dependencies>

/* *
 * @Author lsc
 * <p> JWT工具類 </p>
 * @Param
 * @Return
 */
public class JwtUtil {

 // Token過期時間30分鐘
 public static final long EXPIRE_TIME = 30 * 60 * 1000;

 /* *
 * @Author lsc
 * <p> 校驗token是否正確 </p>
 * @Param token
 * @Param username
 * @Param secret
 * @Return boolean
 */
 public static boolean verify(String token, String username, String secret) {
 try {
 // 設(shè)置加密算法
 Algorithm algorithm = Algorithm.HMAC256(secret);
 JWTVerifier verifier = JWT.require(algorithm)
  .withClaim("username", username)
  .build();
 // 效驗TOKEN
 DecodedJWT jwt = verifier.verify(token);
 return true;
 } catch (Exception exception) {
 return false;
 }
 }

 /* *
 * @Author lsc
 * <p>生成簽名,30min后過期 </p>
 * @Param [username, secret]
 * @Return java.lang.String
 */
 public static String sign(String username, String secret) {
 Date date = new Date(System.currentTimeMillis() + EXPIRE_TIME);
 Algorithm algorithm = Algorithm.HMAC256(secret);
 // 附帶username信息
 return JWT.create()
 .withClaim("username", username)
 .withExpiresAt(date)
 .sign(algorithm);

 }

 /* *
 * @Author lsc
 * <p> 獲得用戶名 </p>
 * @Param [request]
 * @Return java.lang.String
 */
 public static String getUserNameByToken(HttpServletRequest request) {
 String token = request.getHeader("token");
 DecodedJWT jwt = JWT.decode(token);
 return jwt.getClaim("username")
 .asString();
 }
}

/**
 * @Author lsc
 * <p> </p>
 */
@Data
public class SysUser {
 private String username;
 private String password;
}

/**
 * @Author lsc
 * <p> </p>
 */
@RestController
public class SysUserController {

 @PostMapping(value = "/login")
 public Map<String, Object> login(@RequestBody SysUser sysUser){
  Map<String, Object> map = new HashMap<>();
  String username = sysUser.getUsername();
  String password = sysUser.getPassword();
  // 省略 賬號密碼驗證
  // 驗證成功后發(fā)送token
  String token = JwtUtil.sign(username,password);
  if (token != null){
   map.put("code", "200");
   map.put("message","認證成功");
   map.put("token", token);
   return map;
  }
  map.put("code", "403");
  map.put("message","認證失敗");
  return map;
 }
}

{
 "username": "zszxz",
 "password": "zszxz"
}

{
 "code": "200",
 "message": "認證成功",
 "token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJleHAiOjE1ODI4OTc4NDUsInVzZXJuYW1lIjoienN6eHoifQ.vyiExkFWCCmQA3PFYL0jJfIiYGWubngqB0WcgmtHOxg"
}

/**
 * @Author lsc
 * <p>token驗證攔截器 </p>
 */
@Component
public class JwtInterceptor implements HandlerInterceptor {

 @Autowired
 SysUserService sysUserService;

 @Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
  // 從 http 請求頭中取出 token
  String token = request.getHeader("token");
  // 如果不是映射到方法直接通過
  if(!(handler instanceof HandlerMethod)){
   return true;
  }
  if (token != null){
   String username = JwtUtil.getUserNameByToken(request);
   // 這邊拿到的 用戶名 應(yīng)該去數(shù)據(jù)庫查詢獲得密碼，簡略，步驟在service直接獲取密碼
   boolean result = JwtUtil.verify(token,username,sysUserService.getPassword());
   if(result){
    System.out.println("通過攔截器");
    return true;
   }
  }
  return false;
 }

 @Override
 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

 }

 @Override
 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

 }
}

/**
 * @Author lsc
 * <p> 模擬查詢數(shù)據(jù)庫獲得賬號密碼 </p>
 */
@Service
public class SysUserService {


 public String getPassword(){
  return "zszxz";
 }
}

/* *
 * @Author lsc
 * <p>攔截器配置 </p>
 * @Param
 * @Return
 */
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

 /* *
  * @Author lsc
  * <p> 設(shè)置攔截路徑 </p>
  * @Param [registry]
  * @Return void
  */
 @Override
 public void addInterceptors(InterceptorRegistry registry) {
  registry.addInterceptor(authenticationInterceptor())
    .addPathPatterns("/**")
    .excludePathPatterns("/login");
 }
 /* *
  * @Author lsc
  * <p> 將攔截器注入context </p>
  * @Param []
  * @Return com.zszxz.jwt.interceptor.JwtInterceptor
  */
 @Bean
 public JwtInterceptor authenticationInterceptor() {
  return new JwtInterceptor();
 }

 /* *
  * @Author lsc
  * <p>跨域支持 </p>
  * @Param [registry]
  * @Return void
  */
 @Override
 public void addCorsMappings(CorsRegistry registry) {
  registry.addMapping("/**")
    .allowedOrigins("*")
    .allowCredentials(true)
    .allowedMethods("GET", "POST", "DELETE", "PUT", "PATCH", "OPTIONS", "HEAD")
    .maxAge(3600 * 24);
 }
}

/**
 * @Author lsc
 * <p> </p>
 */
@RestController
public class TestController {

 @GetMapping(value = "/api/test")
 public String get(){

  return "zszxz";
 }
}