59. springboot+springcloud+vue+uniapp b2b2c商城之服务提供方进行调用认证

服务提供方就是 provider。服务消费方消费接口时，provider 需要对其进行身份验证，验证通过才可以让它消费接口。这个过程中用到的过滤器可以写在 Common 包中，凡是服务提供方都需要用到。

认证过滤器的代码如下所示。

/**

• API 调用权限控制
  */
  public class HttpBasicAuthorizeFilter implements Filter {
  JWTUtils jwtUtils = JWTUtils.getInstance();

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {

  }

  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

        throws IOException, ServletException {
    HttpServletRequest httpRequest = (HttpServletRequest) request;
    HttpServletResponse httpResponse = (HttpServletResponse) response;
    httpResponse.setCharacterEncoding("UTF-8");
    httpResponse.setContentType("application/json; charset=utf-8");
    String auth = httpRequest.getHeader("Authorization");
    // 验证 TOKEN
    if (!StringUtils.hasText(auth)) {
        PrintWriter print = httpResponse.getWriter();
        print.write(JsonUtils
                .toJson(ResponseData.fail("非法请求【缺少 Authorization 信息 ", ResponseCode.NO_AUTH_CODE.getCode())));
        return;
    }
    JWTUtils.JWTResult jwt = jwtUtils.checkToken(auth);
    if (!jwt.isStatus()) {
        PrintWriter print = httpResponse.getWriter();
        print.write(JsonUtils.toJson(ResponseData.fail(jwt.getMsg(), jwt.getCode())));
        return;
    }
    chain.doFilter(httpRequest, response);

  }

  @Override
  public void destroy() {
  }
  }
  在上述 Filter 类中对所有请求进行拦截，其调用之前写好的 JwtUtils 来检查 Token 是否合法，合法则放行，不合法则拦截并给出友好提示。

验证用的 Filter 类写好了，接下来就是在需要拦截请求进行验证的服务中注册 Filter。如果不需要验证那就不注册，对业务功能无任何影响。在Spring Boot 中注册 Filter 是非常简单、方便的，代码如下所示。

/**

• 过滤器配置
  **/
  @Configuration
  public class FilterConfig {
  @Bean
  public FilterRegistrationBean filterRegistrationBean() {

    FilterRegistrationBean registrationBean = new FilterRegistrationBean();
    HttpBasicAuthorizeFilter httpBasicFilter = new HttpBasicAuthorizeFilter();
    registrationBean.setFilter(httpBasicFilter);
    List<String> urlPatterns = new ArrayList<String>(1);
    urlPatterns.add("/*");
    registrationBean.setUrlPatterns(urlPatterns);
    return registrationBean;

  }
  }
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