Java 接口拦截器的实现以及返回

package com.unionx.api.LoginInterceptor;

import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@Slf4j
@Component
public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public void afterCompletion(HttpServletRequest request,
		HttpServletResponse response, Object obj, Exception err) throws Exception {
    }

	  @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response,
		  Object obj, ModelAndView mav) throws Exception {

    }
	 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
		   		Object obj) throws Exception {
		Boolean flag = false;
		JSONObject outputMSg = new JSONObject();
		String token = request.getHeader(Constant.Token);
		if(StringUtils.isNotBlank(token)){
			flag = true;
		}else{
			outputMSg.put("success", false);
			outputMSg.put("statusCode",101);
			output(outputMSg, request, response);
		}
		return flag;
    }

	public void output(Object json, HttpServletRequest request, HttpServletResponse response) throws IOException {
		response.setContentType("application/json;charset=UTF-8;");
		PrintWriter out = response.getWriter();
		out.println(json);
		out.flush();
		out.close();
	}
}

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