【三】springboot整合token（超详细）

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--swagger        -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!--swagger-ui.html模式        -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!--doc.html模式        -->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.auth0/java-jwt -->
        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.9.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.json/json -->
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20190722</version>
        </dependency>
    </dependencies>

@Component
public class TokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //跨域请求会首先发一个option请求，直接返回正常状态并通过拦截器
        if(request.getMethod().equals("OPTIONS")){
            response.setStatus(HttpServletResponse.SC_OK);
            return true;
        }
        response.setCharacterEncoding("utf-8");
        String token = request.getHeader("token");
        if (token!=null){
            boolean result= TokenUtils.verify(token);
            if (result){
                System.out.println("通过拦截器");
                return true;
            }
        }
        response.setContentType("application/json; charset=utf-8");
        try {
            JSONObject json=new JSONObject();
            json.put("msg","token verify fail");
            json.put("code","500");
            response.getWriter().append(json.toString());
            System.out.println("认证失败，未通过拦截器");
        } catch (Exception e) {
            return false;
        }
        /**
         * 还可以在此处检验用户存不存在等操作
         */
        return false;
    }
}

@Configuration
public class WebConfiguration implements WebMvcConfigurer {

    @Autowired
    private TokenInterceptor tokenInterceptor;

    /**
     * 解决跨域请求
     * @param registry
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedHeaders("*")
                .allowedMethods("*")
//                .allowedOrigins("*")
                .allowedOriginPatterns("*")
                .allowCredentials(true);
    }

    /**
     * 异步请求配置
     * @param configurer
     */
    @Override
    public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
        configurer.setTaskExecutor(new ConcurrentTaskExecutor(Executors.newFixedThreadPool(3)));
        configurer.setDefaultTimeout(30000);
    }

    /**
     * 配置拦截器、拦截路径
     * 每次请求到拦截的路径，就会去执行拦截器中的方法
     * @param configurer
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        List<String> excludePath = new ArrayList<>();
        //排除拦截，除了注册登录(此时还没token)，其他都拦截
        excludePath.add("/userController/login");  //登录
        excludePath.add("/userController/register");     //注册
        excludePath.add("/doc.html");     //swagger
        excludePath.add("/swagger-ui.html");     //swagger
        excludePath.add("/swagger-resources/**");     //swagger
        excludePath.add("/v2/api-docs");     //swagger
        excludePath.add("/webjars/**");     //swagger
//        excludePath.add("/static/**");  //静态资源
//        excludePath.add("/assets/**");  //静态资源
        registry.addInterceptor(tokenInterceptor)
                .addPathPatterns("/**")
                .excludePathPatterns(excludePath);
        WebMvcConfigurer.super.addInterceptors(registry);

    }
}

public class TokenUtils {

    //token到期时间10小时
    private static final long EXPIRE_TIME= 10*60*60*1000;
    //密钥盐
    private static final String TOKEN_SECRET="ljdyaishijin**3nkjnj??";

    /**
     * 生成token
     * @param user
     * @return
     */
    public static String sign(User user){

        String token=null;
        try {
            Date expireAt=new Date(System.currentTimeMillis()+EXPIRE_TIME);
            token = JWT.create()
                    //发行人
                    .withIssuer("auth0")
                    //存放数据
                    .withClaim("username",user.getUserName())
                    //过期时间
                    .withExpiresAt(expireAt)
                    .sign(Algorithm.HMAC256(TOKEN_SECRET));
        } catch (IllegalArgumentException|JWTCreationException je) {

        }
        return token;
    }


    /**
     * token验证
     * @param token
     * @return
     */
    public static Boolean verify(String token){

        try {
            //创建token验证器
            JWTVerifier jwtVerifier=JWT.require(Algorithm.HMAC256(TOKEN_SECRET)).withIssuer("auth0").build();
            DecodedJWT decodedJWT=jwtVerifier.verify(token);
            System.out.println("认证通过：");
            System.out.println("username: " + decodedJWT.getClaim("username").asString());
            System.out.println("过期时间：      " + decodedJWT.getExpiresAt());
        } catch (IllegalArgumentException |JWTVerificationException e) {
            //抛出错误即为验证不通过
            return false;
        }
        return true;
    }

}

@ApiOperation(value = "登录")
    @GetMapping("/login")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "userName", value = "用户名", paramType = "String"),
            @ApiImplicitParam(name = "passWord", value = "密码", paramType = "String")
    })
    public BaseResponse<HashMap> login(@RequestParam(value = "userName") String userName, @RequestParam(value = "passWord") String passWord) throws JsonProcessingException {
        //包装token
        User user = new User();
        user.setUserName(userName);
        user.setPassword(passWord);
        String token= TokenUtils.sign(user);
        HashMap<String,Object> hs=new HashMap<>();
        hs.put("token",token);
        return RespGenerator.returnOK(hs);
    }