拦截器-java

myLanJieQi.java

package com.sec.test;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class myLanJieQi implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("token");
        ObjectMapper objectMapper = new ObjectMapper();

        if(token==null||token==""||"".equals(token)){
            System.out.println("token不存在");
            String error = objectMapper.writeValueAsString("error");
            response.getWriter().write(error);
            return false;
        }
        return true;
    }
}

myWebMvcConfigurer.java

package com.sec.test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;
import java.util.ArrayList;

@Configuration
@EnableWebMvc
public class myWebMvcConfigurer implements WebMvcConfigurer {

    @Resource
    myLanJieQi myLanJieQi;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        ArrayList<String> arrayList = new ArrayList<>();
        arrayList.add("/bootstrap3/**");
        arrayList.add("/css/**");
        arrayList.add("/images/**");
        arrayList.add("/js/**");
        arrayList.add("/web/register.html");
        arrayList.add("/web/login.html");
        arrayList.add("/web/index.html");
        arrayList.add("/web/product.html");
        arrayList.add("/users/register");
        arrayList.add("/users/login");
        arrayList.add("/districts/**");
        arrayList.add("/products/**");

        registry.addInterceptor(myLanJieQi)//添加自己写好的拦截器
                .addPathPatterns("/**")//所有路径都拦截
                .excludePathPatterns(arrayList);//这些路径不拦截
    }
}