ThreadLocal,LoginFilter实现登录请求的拦截

ゞ浴缸里的玫瑰 2022-05-12 02:48 244阅读 0赞

## RequestHolder ##

1.  ThreadLocal 相当于map，map中的key是当前的进程

public class RequestHolder {
    
        private static final ThreadLocal<SysUser> userHolder = new ThreadLocal<SysUser>();
    
        private static final ThreadLocal<HttpServletRequest> requestHolder = new ThreadLocal<HttpServletRequest>();
    
        public static void add(SysUser sysUser) {
            userHolder.set(sysUser);
        }
    
        public static void add(HttpServletRequest request) {
            requestHolder.set(request);
        }
    
        public static SysUser getCurrentUser() {
            return userHolder.get();
        }
    
        public static HttpServletRequest getCurrentRequest() {
            return requestHolder.get();
        }
    
        public static void remove() {
            userHolder.remove();
            requestHolder.remove();
        }
    }

## 使用 ##

Interceptor
    
        @Override
        public void afterCompletion {
            removeThreadLocalInfo();
        }
    
        public void removeThreadLocalInfo() {
            RequestHolder.remove();;
        }

## LoginFilter ##

@Slf4j
    public class LoginFilter implements Filter { 
    
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            HttpServletRequest req = (HttpServletRequest) servletRequest;
            HttpServletResponse resp = (HttpServletResponse) servletResponse;
    
            SysUser sysUser = (SysUser)req.getSession().getAttribute("user");
            if (sysUser == null) {
                String path = "/signin.jsp";
                resp.sendRedirect(path);
                return;
            }
            RequestHolder.add(sysUser);
            RequestHolder.add(req);
            filterChain.doFilter(servletRequest, servletResponse);
            return;
        }
    
        public void destroy() {
    
        }
    }
    
    web.xml
    
      <filter>
        <filter-name>loginFilter</filter-name>
        <filter-class>com.mmall.filter.LoginFilter</filter-class> </filter> <filter-mapping> <filter-name>loginFilter</filter-name> <url-pattern>/sys/*</url-pattern> <url-pattern>/admin/*</url-pattern> </filter-mapping>