SpringBoot实现前端请求拦截器

参考文档：https://blog.csdn.net/a14654/article/details/110383829

一、编写自定义拦截器：

package com.example.demo.loginInterceptor;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;


public class PermissionInterceptor implements HandlerInterceptor {

    //controller层之前执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //从请求头中获取所需参数
        String token = request.getHeader("Authorization");
        System.out.println("打印Token = " + token);
        boolean isHavePermission = (token != null);
        //返回 true，放行  false，拦截
        if (isHavePermission) {
            System.out.println("权限检查通过::操作放行");
            return true;
        } else {
            //设置response，手动返回response响应
            response.setContentType("application/json;charset=utf-8");
            Map<String, Object> error = new HashMap<>();
            error.put("code", 70001);
            error.put("msg", "无访问权限");
            error.put("data", "权限检查失败::当前用户没有该权限");
            Gson gson = new GsonBuilder().create();
            response.getWriter().print(gson.toJson(error));

            System.out.println("拦截不通过");
            //设置response，手动返回response响应
            return false;
        }
    }

}

 

二、将编写的自定义拦截器，加入到拦截系统中：

package com.example.demo.loginInterceptor;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Bean
    public PermissionInterceptor permissionInterceptor() {
        return new PermissionInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(permissionInterceptor())
                //.excludePathPatterns("/permission/get")
                //添加拦截路径 /** ：拦截所有路径
                .addPathPatterns("/**");
    }

}