服务端SpringBoot2.x   :localhost:8082

前端Vue2.x                 :localhost:81

前后端的端口号不同,为跨域,导致前端访问后端时,每次访问都新生产一个sessionID。解决如下:

后端:

1.添加过滤器:

package com.nsoft.gkzp.syscore.config.filter;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(urlPatterns = "/*", filterName = "corsFilter")
public class CorsFilter implements Filter {

    final private static Logger logger = LogManager.getLogger(CorsFilter.class);
    @Override
    public void destroy() {
    }
    /**
     * 此过滤器只是处理跨域问题
     * @param servletRequest
     * @param servletResponse
     * @param chain
     * @throws ServletException
     * @throws IOException
     */
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String origin = request.getHeader("Origin");
        if(origin == null) {
            origin = request.getHeader("Referer");
        }
        response.setHeader("Access-Control-Allow-Origin", origin);// 允许指定域访问跨域资源(这里不能写*,*代表接受所有域名访问,如写*则下面一行代码无效。谨记)
        response.setHeader("Access-Control-Allow-Credentials", "true");//true代表允许客户端携带cookie(此时origin值不能为“*”,只能为指定单一域名)
        response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH"); /// 允许浏览器在预检请求成功之后发送的实际请求方法名
        response.setHeader("Access-Control-Allow-Headers", "Authorization,Origin, X-Requested-With, Content-Type, Accept,Access-Token");// 允许浏览器发送的请求消息头
        //response.setHeader("Access-Control-Max-Age", "86400");            // 浏览器缓存预检请求结果时间,单位:秒

        chain.doFilter(request,response);
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }


}

2. springboot2.配置过滤器时,启动类必须加上@ServletComponentScan才会加载过滤器

package com.nsoft.gkzp;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.server.ConfigurableWebServerFactory;
import org.springframework.boot.web.server.ErrorPage;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpStatus;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * springboot入口
 * MapperScan("com.nsoft.gkzp.**.dao")为扫描mapper, 所以dao下面的类就不需要添加@mapper注解了
 * ServletComponentScan  添加了过滤器,故这里要添加@ServletComponentScan注解,spring才会扫描到过滤器(eg:com.nsoft.gkzp.syscore.config.filter.CorsFilter)
 */
@SpringBootApplication
@ServletComponentScan
@MapperScan("com.nsoft.gkzp.**.dao")
public class GzyGkzpApplication {

    public static void main(String[] args) {
        SpringApplication.run(GzyGkzpApplication.class, args);
    }


    /**
     * 在springboot整合vue前端时,vue使用url跳转时报404错误,此处代码解决此问题
     * 参照https://blog.csdn.net/Mr_EvanChen/article/details/83625082
     */
    @Bean
    public WebServerFactoryCustomizer<ConfigurableWebServerFactory> webServerFactoryCustomizer(){
        return factory -> {
            ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/index.html");
            factory.addErrorPages(error404Page);
        };
    }

}

3. spring-session 2.x 中 Cookie里面了SameSite ,他默认值是 Lax 

SameSite Cookie 是用来防止CSRF攻击,它有两个值:Strict、Lax
SameSite = Strict:意为严格模式,表明这个cookie在任何情况下都不可能作为第三方cookie;
SameSite = Lax  :意为宽松模式,在get请求是可以作为第三方cookie,但是不能携带cookie进行跨域post访问(这就很蛋疼了,我们那个校验接口就是POST请求)

package com.nsoft.gkzp.syscore.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.session.web.http.CookieSerializer;
import org.springframework.session.web.http.DefaultCookieSerializer;

/**
* https://www.cnblogs.com/hujinshui/p/11025848.html
* spring-session 2.x 中 Cookie里面引入了SameSite他默认值是 Lax,
* SameSite Cookie 是用来防止CSRF攻击,它有两个值:Strict、Lax
* SameSite = Strict:意为严格模式,表明这个cookie在任何情况下都不可能作为第三方cookie;
* SameSite = Lax:意为宽松模式,在get请求是可以作为第三方cookie,但是不能携带cookie进行跨域post访问
* 总结:前端请求到后台,每次session都不一样,每次都是新的会话,导致获取不到用户信息
*/
@Configuration public class SpringSessionConfig { public SpringSessionConfig() { } @Bean public CookieSerializer httpSessionIdResolver() { DefaultCookieSerializer cookieSerializer = new DefaultCookieSerializer(); // 取消仅限同一站点设置 cookieSerializer.setSameSite(null); return cookieSerializer; } }

前端:

1.在 main.js (前端用axios)

import axios from 'axios';
axios.defaults.withCredentials=true;//让ajax携带cookie

用了1天半时间,改了很多次依然不行,后来发现是前端用了 proxy 代理,它本身也是已经处理了跨域问题,网上找的时候发现有的文章也用到这个了。但我这里就是不行。

我原来的代码:

1)写的注册页面:

 2)全局配置如下:

main.js

// xenv 标记当前环境 true:开发环境   false:生产环境
const xenv = true;
// 注册全局变量
Vue.prototype.$global = {
   //contentPath 标记根路径,主要用于axios请求后端数据的url
   contentPath: xenv ? '/api/' : router.options.base  
};

(xenv设为true;所以 根路径contentPath的值必为‘/api/’   ,而‘/api/’ 在vue.config.js里配置为代理,如下。)

vue.config.js

  devServer: {
    open: true,
    host: '0.0.0.0',
    port: 80,
    https: false,
    hotOnly: false,
    before: app => {
    },
    proxy: {
      // 配置跨域
      '/api': {
        target: 'http://127.0.0.1:8082/',
        ws: true,
        changOrigin: true,
        pathRewrite: {
          '^/api': '/'
        }
      }
    }
  },

2.不使用proxy代理,把根目录写死为'http://127.0.0.1:8082/',就成功了,修改如下:

main.js:

// xenv 标记当前环境 true:开发环境   false:生产环境
const xenv = true;
// 注册全局变量
Vue.prototype.$global = {
  // contentPath 标记根路径,主要用于axios请求后端数据的url
  // contentPath: xenv ? '/api/' : router.options.base
  contentPath:  'http://127.0.0.1:8082/'
};

参照:

https://www.cnblogs.com/zimublog/p/10786110.html

https://blog.csdn.net/qq_17555933/article/details/92017890

02-12 16:14