Interceptor 拦截器自定义操作

1，自定义登录Interceptor类： 

/**
 * 登录拦截器
 */
public class LoginInterceptor implements HandlerInterceptor {



    /**
     * 在controller 层之前拦截
     * @param request
     * @param response
     * @param handler
     * @return  true 放行请求   false 拦截请求
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException {
        //request中获取token
        String token = request.getHeader("token");
        if (token == null) token = request.getParameter("token");

        if (token == null){
            //验证token有效性
            Claims claims = JwtUtil.checkJWT(token);
            if (claims == null){
                respMsg(response , "token 不合法！");
                return false;
            }
            //  可在此获取token的基本信息存入 session中 以方便controller层使用
            request.getSession().setAttribute("userId" , claims.get("id"));
            request.getSession().setAttribute("userName" , claims.get("name"));
            return true;
        }
        //未登录
        respMsg(response , "未登录");
        return false;
    }

    /**
     * 返回响应信息
     * @param response
     * @param msg
     * @throws IOException
     */
    private static void respMsg(HttpServletResponse response , String msg) throws IOException {
        response.setContentType("application/json; charset=utf-8");
        PrintWriter writer = response.getWriter();
        writer.print(msg);
        writer.close();
        response.flushBuffer();
    }

 

2，将自定义拦截器加入到Inteceptor中：

 

/**
 * 将自定义 LoginInterceptor 加入拦截中
 */
@Configuration
public class LoginInterceptorConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 放行不需登录即可访问的接口url   其他都要拦截
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("user/api/*/**");
        WebMvcConfigurer.super.addInterceptors(registry);
    }
}

 

（第一步中的 JwtUtil.java 类可在本文章所在分类中找到）