자바 서버 에서 api 를 제공 할 때 token 검증

package com.lst.classifydeviceapi.filter;

import com.lst.api.enummsg.ReturnMsg;
import com.lst.api.utils.JsonUtils;
import com.lst.api.utils.TokenUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@Component
@WebFilter(urlPatterns = { "/*" }, filterName = "tokenAuthorFilter")
public class TokenAuthorFilter implements Filter {

    private static Logger logger = LoggerFactory
            .getLogger(TokenAuthorFilter.class);


    @Override
    public void destroy() {

    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse rep = (HttpServletResponse) response;

        //         
        //               ip（                   IP）
        rep.setHeader("Access-Control-Allow-Origin", "*");
        //        
        rep.setHeader("Access-Control-Allow-Methods","POST, GET, PUT, OPTIONS, DELETE, PATCH");
        // Access-Control-Max-Age    CORS        
        rep.setHeader("Access-Control-Max-Age", "3600");
        rep.setHeader("Access-Control-Allow-Headers","token,Origin, X-Requested-With, Content-Type, Accept");


        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        String token = req.getHeader("token");//header  
        ReturnMsg resultInfo = new ReturnMsg();
        boolean isFilter = false;


        String method = ((HttpServletRequest) request).getMethod();
        if (method.equals("OPTIONS")) {
            rep.setStatus(HttpServletResponse.SC_OK);
        }else{
            if (null == token || token.isEmpty()) {
                resultInfo.setCode("false");
                resultInfo.setMessage("          !         token  ");
            } else {
                if (TokenUtil.volidateToken(token)) {
                    resultInfo.setCode("true");
                    resultInfo.setMessage("        !");
                    isFilter = true;
                } else {
                    resultInfo.setCode("false");
                    resultInfo.setMessage("          !       token    ");
                }
            }
            if (resultInfo.getCode() == "false") {//     
                try {
                    JsonUtils.sendUtilsError(rep,resultInfo.getMessage());
                } catch (Exception e) {
                    logger.error("         :" + e.getMessage(), e);
                }
            }
        }
        if (isFilter) {
                logger.info("token filter  ok!");
                chain.doFilter(request, response);
            }
    }
    @Override
    public void init(FilterConfig arg0) throws ServletException {

    }

}