【SpringBoot】跨域、过滤器及swaggerUI配置

1. springboot WebAppConfig配置

/**
 * Created with IntelliJ IDEA.
 *
 * @author: zhangenke @Date: 2018/8/16 on 下午2:25
 * @description: 让 springBoot 知道有这个拦截器
 */
@Slf4j
@Configuration
public class WebAppConfig extends WebMvcConfigurationSupport {
  //    以下WebMvcConfigurerAdapter 比较常用的重写接口
  //    /** 解决跨域问题 **/
  //    public void addCorsMappings(CorsRegistry registry) ;
  //    /** 添加拦截器 **/
  //    void addInterceptors(InterceptorRegistry registry);
  //    /** 这里配置视图解析器 **/
  //    /** 视图跳转控制器 **/
  //    void addViewControllers(ViewControllerRegistry registry);
  //    void configureViewResolvers(ViewResolverRegistry registry);
  //    /** 配置内容裁决的一些选项 **/
  //    void configureContentNegotiation(ContentNegotiationConfigurer configurer);
  //    /** 视图跳转控制器 **/
  //    void addViewControllers(ViewControllerRegistry registry);
  //    /** 静态资源处理 **/
  //    void addResourceHandlers(ResourceHandlerRegistry registry);
  //    /** 默认静态资源处理器 **/
  //    void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer);

  // private final ProcureInterceptor procureInterceptor;
  //
  // @Autowired
  // public WebAppConfig(ProcureInterceptor procureInterceptor) {
  //    this.procureInterceptor = procureInterceptor;
  // }

  private final TokenUtils tokenUtils;
  private final TokenDao tokenDaoImpl;

  @Autowired
  public WebAppConfig(TokenUtils tokenUtils, TokenDao tokenDaoImpl) {
    this.tokenUtils = tokenUtils;
    this.tokenDaoImpl = tokenDaoImpl;
  }

  @Bean
  public ProcureInterceptor getProcureInterceptor() {
    return new ProcureInterceptor(tokenUtils, tokenDaoImpl);
  }

  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    // 多个拦截器组成一个拦截器链
    // addPathPatterns 用于添加拦截规则
    // excludePathPatterns 用户排除拦截
    log.info("tokenUtils:{}", tokenUtils);
    log.info("tokenDaoImpl:{}", tokenDaoImpl);
    log.info("WebAppConfig拦截器注入成功：**********************************************");
    // log.info("procureInterceptor:{}", procureInterceptor);
    // registry.addInterceptor(new ProcureInterceptor(tokenUtils,
    // tokenDaoImpl)).addPathPatterns("/**")
    registry
        .addInterceptor(getProcureInterceptor())
        .addPathPatterns("/**")
        .excludePathPatterns(
            "/swagger-resources/**",
            "/webjars/**",
            "/v2/**",
            "/swagger-ui.html/**",
            "/configuration/**");
    // 对来自/user/** 这个链接来的请求进行拦截;
    // super.addInterceptors(registry);
    // registry.addInterceptor(getInterfaceAuthCheckInterceptor()
    // 这种方式无论什么情况都可以
    // registry.addInterceptor(new InterfaceAuthCheckInterceptor())
    // 这种情况时，自定义的interceptor中不能注入其他内容，比如redis或者其他service，如果要注入，必须使用上面这种方法
  }

  @Override
  protected void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry
        .addResourceHandler("swagger-ui.html")
        .addResourceLocations("classpath:/META-INF/resources/");
    registry
        .addResourceHandler("/webjars/**")
        .addResourceLocations("classpath:/META-INF/resources/webjars/");
  }

  /**
   * @param [configurer]
   * @return void
   * @author chaosgod 2018/10/17 上午11:34
   * @description : 配置访问静态文件
   */
  @Override
  public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
  }

  @Override
  public void configureMessageConverters(List> converters) {
    FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
    FastJsonConfig config = new FastJsonConfig();
    config.setSerializerFeatures(
        SerializerFeature.WriteNullListAsEmpty,
        SerializerFeature.WriteMapNullValue,
        SerializerFeature.WriteNullStringAsEmpty,
        SerializerFeature.WriteNullBooleanAsFalse,
        SerializerFeature.WriteDateUseDateFormat,
        SerializerFeature.PrettyFormat,
        SerializerFeature.DisableCircularReferenceDetect);
    converter.setFastJsonConfig(config);
    converters.add(converter);

    // SerializerFeature.WriteNullListAsEmpty：List类型字段为null时输出[]而非null
    // SerializerFeature.WriteMapNullValue：显示空字段
    // SerializerFeature.WriteNullStringAsEmpty：字符串类型字段为null时输出""而非null
    // SerializerFeature.WriteNullBooleanAsFalse：Boolean类型字段为null时输出false而null
    // SerializerFeature.PrettyFormat：美化json输出，否则会作为整行输出
  }

  // @Override
  // protected void addCorsMappings(CorsRegistry registry) {
  //    registry.addMapping("/**");
  //    super.addCorsMappings(registry);
  // }
}

2. ProcureInterceptor配置

/**
 * @author zhangenke
 */
@Slf4j
@Component
public class ProcureInterceptor implements HandlerInterceptor {
    private static final String VALUE = "false";
    private static final String OPTIONS = "OPTIONS";

    private final SessionService sessionServiceImpl;


    @Autowired
    public ProcureInterceptor(SessionService sessionServiceImpl) {
        this.sessionServiceImpl = sessionServiceImpl;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        String[] noFilters = new String[]{"login", "errorSession", "swagger", "images", "v2"};
        String uri = request.getRequestURI();
        boolean beFilter = true;
        log.info("请求地址uri:{}", uri);
        log.info("请求方式：{}", request.getMethod());
        // 预请求
        if (OPTIONS.equals(request.getMethod())) {
            response.setHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Allow-Methods", "*");
            response.setHeader("Access-Control-Max-Age", "3600");
            response.setHeader("Access-Control-Allow-Headers", "Authentication,Origin, X-Requested-With, " +
                    "Content-Type, Accept,sessionId");
            return true;
        }
        // 配置跨域
        response.setHeader("Access-Control-Allow-Origin", "*");

        String requestId = request.getHeader("X-REQUEST-ID");
        String userAgent = request.getHeader("User-Agent");
        if (requestId != null) {
            MDC.put("requestUUID", requestId);
        }
        if (userAgent != null) {
            MDC.put("User-Agent", userAgent);
        }
        log.info("变量:{}", JSON.toJSONString(request.getParameterMap()));
        String sessionId = request.getHeader("sessionId");
        log.info("Headers-sessionId: {}", sessionId);
        for (String s : noFilters) {
            if (uri.contains(s)) {
                beFilter = false;
                break;
            }
        }
        String origin = request.getHeader("Origin");
        log.info("请求收到的Origin为：{}", origin);
        
        // todo
        return true;
    }

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

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception
            ex) {
        // TODO Auto-generated method stub

    }

 
}

如上图，这样配置即可，

2018-10-23优化，亲测可过swagger-ui，及静态文件

2019-01-22优化，本地测试可随意过，上线Linux，会偶尔出现跨域，但重新打包后，又可以过。

目前，暂未找到该问题的解决办法

（可能与Linux有关，杀掉进程后，如果Enter直到出现此进程被杀的提示后，重新上线，即可过）