这里添加一个简单的工具类，将HttpServletRequest通过getHeader方法，生成CommonHeader类：
public class HttpUtil { /** * 获取请求头信息 * * @param request * @return */ public static CommonHeader getCommonHeader(HttpServletRequest request) { String UID = request.getHeader("uid"); Long uid = null; if (StringUtils.isNotBlank(UID)) { uid = Long.parseLong(UID); } return new CommonHeader(HttpUtil.getIp(request), request.getHeader("deviceId"), uid); } /** * 获取IP * * @param request * @return */ public static String getIp(HttpServletRequest request) { String ip = request.getHeader("X-Forwarded-For"); if (null != ip && !"".equals(ip.trim()) && !"unknown".equalsIgnoreCase(ip)) { int index = ip.indexOf(','); if (index != -1) { return ip.substring(0, index); } else { return ip; } } ip = request.getHeader("X-Real-IP"); if (null != ip && !"".equals(ip.trim()) && !"unknown".equalsIgnoreCase(ip)) { return ip; } return request.getRemoteAddr(); } } 拦截器类实现最核心的实现终于出场了，这里继承HandlerInterceptorAdapter，这里作了简化处理：
/** * 请求头处理 * * @author yangfei */ @Component public class BaseInterceptor extends HandlerInterceptorAdapter { private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(BaseInterceptor.class); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { RequestWrap.getThreadLocal().set(HttpUtil.getCommonHeader(request)); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { RequestWrap.getThreadLocal().remove(); } @Override public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { } }如上一章节描述的逻辑，在preHandle方法内将request中的ip,uid,deviceId封装到RequestWrap对象里，在afterCompletion中对该线程的ThreadLocal值进行释放。
业务接口方法的使用在Controller类的接口方法中，如要获取uid信息，只需要调用RequestWrap.getUid()方法即可，再也不需要在每个接口上声明uid参数了，如下示例：
/** * 获取用户基础信息 */ @PostMapping(value = "/user/info") public Response<UserInfo> getUserInfo() { return userManager.getUserInfo(RequestWrap.getUid()); } 总结这个实战的目标是解决通用header信息的在接口的重复定义问题，基于HandlerInterceptorAdapter拦截器的实现，ThreadLocal对线程访问数据的隔离来实现的，在实际生产项目应用中有很好的借鉴意义，希望对你有帮助。
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