vue的axios拦截器实现未登录页面跳转

1.拦截器分为request请求拦截器和response响应拦截器

PS：request请求拦截器：发送请求前统一处理，如：设置请求头headers、应用的版本号、终端类型等。
response响应拦截器：有时候我们要根据响应的状态码来进行下一步操作，例如：由于当前的token过期，接口返回401未授权，那我们就要进行重新登录的操作。

2.main.js文件中（先安装axios）

 

import axios from 'axios'

// 给Vue函数添加一个原型属性$axios指向axios（全局使用axios）
// vue实例中直接用this.$axios就可以执行axios方法
Vue.prototype.$axios=axios

3.http request 请求拦截器

PS：发送请求之前判断是否存在token，除了登录页，其他页面请求头headers都添加token

 

// http request 请求拦截器
axios.interceptors.request.use(config => {
    // 在发送请求之前做些什么
    let pathname = location.pathname;
    if(localStorage.getItem('token')){
        if(pathname != '/' &&  pathname != '/login'){
            config.headers.common['token'] = localStorage.getItem('token');
        }
    }
    return config;
}, error => {
    // 对请求错误做些什么
    return Promise.reject(error);
});

4.http response 响应拦截器

PS：若返回401，页面跳转到登录页面

 

// http response 响应拦截器
axios.interceptors.response.use(response => {
    return response;
},error => {
    if (error.response) {
        switch (error.response.status) {
            // 返回401，清除token信息并跳转到登录页面
            case 401:
            localStorage.removeItem('token');
            router.replace({
                path: '/login'
                //登录成功后跳入浏览的当前页面
                // query: {redirect: router.currentRoute.fullPath}
            })
        }
        // 返回接口返回的错误信息
        return Promise.reject(error.response.data);
    }
});

springboot设置拦截器

 

package com.cignacmb.sms.common.interceptor;

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

@Configuration
public class InterceptorConfig extends WebMvcConfigurationSupport {

    @Autowired
    private LoginInterceptor loginInterceptor;
    
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        // 多个拦截器组成一个拦截器链
        // addPathPatterns 用于添加拦截规则，/**表示拦截所有请求
        // excludePathPatterns 用户排除拦截
        registry.addInterceptor(loginInterceptor).addPathPatterns("/**");
//        .excludePathPatterns("/stuInfo/getAllStuInfoA","/account/register");    
        super.addInterceptors(registry);
    }
}

 

package com.cignacmb.sms.common.interceptor;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.cignacmb.sms.common.Constants;

@Component
public class LoginInterceptor implements HandlerInterceptor {
    
    private static Logger log = LoggerFactory.getLogger(LoginInterceptor.class);

    @Override
    public void afterCompletion(HttpServletRequest arg0,
            HttpServletResponse arg1, Object arg2, Exception arg3)
            throws Exception {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
            Object arg2, ModelAndView arg3) throws Exception {
        // TODO Auto-generated method stub
        
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
            Object handler) throws Exception {
        //获取请求的URL
        String url = request.getRequestURI();
        log.info("请求url:" + url);
        //URL:除了登陆的请求，其余都拦截
        if (url != null && url.contains("/login")) {
            return true;
        }
        //判断是否已登录
        if(request.getSession().getAttribute(Constants.USER_SESSION) != null){
            return true;
        }
        response.setContentType("text/html;charset=UTF-8");
        ServletOutputStream out = response.getOutputStream();
        out.write("未授权访问,请登录账号".getBytes("UTF-8"));
        response.setStatus(999);
        out.flush();
        out.close();
        return false;
    }

}

原文链接：https://blog.csdn.net/weixin_39378691/article/details/83750056