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。 需要框架源码点击这里
认证过滤器的代码如下所示。
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/**
* 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() {
}
}
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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。
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/**
* 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;
}
}</string></string>
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