Java拦截器以及自定义注解的使用是怎么样的

Java拦截器以及自定义注解的使用是怎么样的，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

1，设置预处理，设置不需要拦截的请求

@Componentpublic class MyWebConfig implements WebMvcConfigurer {  private final UserTokenInterceptor userTokenInterceptor;  private final SecurityInterceptor securityInterceptor;  public MyWebConfig(      UserTokenInterceptor userTokenInterceptor, SecurityInterceptor securityInterceptor) {    this.userTokenInterceptor = userTokenInterceptor;    this.securityInterceptor = securityInterceptor;  }  @Override  public void addInterceptors(InterceptorRegistry registry) {    // 定义排除swagger访问的路径配置    String[] swaggerExcludes =        new String[] {"/swagger-ui.html", "/swagger-resources/**", "/webjars/**"};    registry        .addInterceptor(userTokenInterceptor)        .addPathPatterns("/**")        .excludePathPatterns(            "/user/login", "/static/**", "/*.html", "/*.ico", "/*.json", "/*.png", "/heartbeat/**")        .excludePathPatterns(swaggerExcludes);    registry        .addInterceptor(securityInterceptor)        .addPathPatterns("/maintain/**", "/user/**")        .excludePathPatterns("/user/login");  }}

2.UserTokenInterceptor ，securityInterceptor分别处理不同的请求拦截，执行不同的拦截逻辑。

2个处理的类请求上可以有交集，2个处理类都执行。

@Componentpublic class UserTokenInterceptor implements HandlerInterceptor {  private final EmpInfoService empInfoService;  public UserTokenInterceptor(EmpInfoService empInfoService) {    this.empInfoService = empInfoService;  }  @Override  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)      throws Exception {    // 校验handler是否是HandlerMethod    if (!(handler instanceof HandlerMethod)) {      return true;    }    // 从请求头中获取token    String token = request.getHeader("Authorization");    /**     * update:2021/11/30 ShengJieLi     * 增加逻辑：Authorization的值不为本系统生成的token时，解密Authorization，获取token并验证     */    if (StrUtil.isNotEmpty(token)) {      EmpInfo securityEmployee = empInfoService.queryToken(token);      if(securityEmployee != null){        // token有效        String ref = empInfoService.isRef(token);        if (StrUtil.isNotBlank(ref)) {          response.setHeader("Access-Control-Expose-Headers", "token");          response.addHeader("token", ref);        }      }else{        //Authorization为PBE加密数据        securityEmployee = empInfoService.analyticQueryToken(token,response);      }      if (securityEmployee != null) {        // token有效        // 将User对象放入到ThreadLocal中        UserLocal.set(securityEmployee);        return true;      }      return false;    }//    String s = JSONUtil.toJsonStr(ResponseResult.error(ErrorCode.TOKEN_ERROR));//    response.setContentType("text/html;charset=UTF-8");//    JSONUtil.toJsonStr(s, response.getWriter());//    response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);    InterceptorExceptionResolver.interceptorError(response,ErrorCode.TOKEN_ERROR);    //update 结束    return false;  }  @Override  public void afterCompletion(      HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)      throws Exception {    // 响应结束后刪除對象    UserLocal.remove();  }}

@SecurityGrade({"SUPER_ADMIN", "SYSTEM_ADMIN"})public class SecurityController {  private final EmpInfoService empInfoService;  public SecurityController(EmpInfoService empInfoService) {    this.empInfoService = empInfoService;  }  @GetMapping("getUserInformation")  @ApiOperation("登陸用户信息")  @NoAuthorization  public ResponseResult getUserInformation(@ApiIgnore HttpServletResponse response) {    return empInfoService.getUserInformation(response);  }}

3.关于注解的使用

@SecurityGrade({"SUPER_ADMIN", "SYSTEM_ADMIN"})public class SecurityController {  private final EmpInfoService empInfoService;  public SecurityController(EmpInfoService empInfoService) {    this.empInfoService = empInfoService;  }  @GetMapping("getUserInformation")  @ApiOperation("登陸用户信息")  @NoAuthorization  public ResponseResult getUserInformation(@ApiIgnore HttpServletResponse response) {    return empInfoService.getUserInformation(response);  }}

method.getMethodAnnotation(SecurityGrade.class) 获得注解信息，methodAnnotation.value()获得注解内容"SUPER_ADMIN", "SYSTEM_ADMIN"。

看完上述内容，你们掌握Java拦截器以及自定义注解的使用是怎么样的的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注行业资讯频道，感谢各位的阅读！