前端websocket的定义：

init: function () {
        if(typeof(WebSocket) === "undefined"){
          alert("您的浏览器不支持socket")
        }else{
          console.log('支持socket')
          // 实例化socket
          this.socket = new WebSocket(this.path)
          // // 监听socket连接
          this.socket.onopen = this.open1
          // // 监听socket错误信息
          this.socket.onerror = this.error
          // // 监听socket消息[回应处理]
          this.socket.onmessage = this.getMessage
        }

      },
      open1: function () {
        console.log("socket连接成功")
      },
      error: function () {
        console.log("连接错误")
      },
      getMessage: function (msg) {
        console.log('msg',msg);
        console.log('msg-json',JSON.parse(msg.data.toString()));
        let a = JSON.parse(msg.data.toString());
        this.roleList = a;
        this.total = a.length;
        this.loading = false;
      },
      send: function () {
        this.socket.send('message=123456')
      },
      close: function () {
        console.log("socket已经关闭")
      },
      destroyed() {
        // 销毁监听
        this.socket.onclose = this.close
      },
      /** 查询角色列表 */
      getList() {
        this.loading = true;
        listRole(this.addDateRange(this.queryParams, this.dateRange)).then(
          response => {
            this.roleList = response.rows;
            this.total = response.total;
            this.loading = false;
          }
        );
      },

前端websocket的使用：在前端初始化页面的时候使用

//前端的使用websocket
import {createWebsocket,reConnect} from "@api/websocket.js"

created(){
	new createWebsocket(
		this.userName,
		(data)=>{
			console.log(data,"websocket");
			if(data){
				this.topFlush();
				this.getlist(); //刷新列表页
			}
		},
		(data)=>{
			reConnect();
		}
	);
	this.getlist();//刷新列表页
}

后端配置websocket开始生效，需要先引入包

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
            <version>2.4.5</version>
   </dependency>

全局配置websocket

package com.ruoyi.framework.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

import javax.websocket.server.ServerEndpoint;

@Configuration
@EnableWebSocket
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter(){
        return new ServerEndpointExporter();
    }
}

后端定义websocket

package com.ruoyi.web.socket;

import com.alibaba.fastjson.JSONObject;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

@Component
@ServerEndpoint("/websocket/{username}")
public class WebSocket {

    private static int onlineCount = 0;
    private static Map<String, WebSocket> clients = new ConcurrentHashMap<>();
    private Session session;
    private String username;

    @OnOpen
    public void onOpen(@PathParam("username") String username, Session session) throws IOException {
        this.username = username;
        this.session = session;
        addOnlineCount();
        clients.put(username, this);
        System.err.print(username + "已连接");
    }

    @OnClose
    public void onClose() throws IOException {
        clients.remove(username);
        subOnlineCount();
    }

    @OnMessage
    public void onMessage(String message) throws IOException {
        JSONObject jsonTo = JSONObject.parseObject(message);
        String msg = jsonTo.getString("message");
        if (!jsonTo.getString("To").equals("All")) {
            sendMessageTo(msg, jsonTo.getString("To").toString());
        } else {
            sendMessageAll("发给所有人");
        }
    }

    @OnError
    public void onError(Session session, Throwable error) {
        error.printStackTrace();
    }

    public void sendMessageTo(String message, String To) throws IOException {
        for (WebSocket item : clients.values()) {
            if (item.username.equals(To)){
                item.session.getAsyncRemote().sendText(message);
            }
        }
    }

    public void sendMessageAll(String message) throws IOException {
        for (WebSocket item : clients.values()) {
            item.session.getAsyncRemote().sendText(message);
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocket.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocket.onlineCount--;
    }

    public static synchronized Map<String, WebSocket> getClinets() {
        return clients;
    }


}

后端使用websocket：在每个控制层的最后使用

    @PreAuthorize("@ss.hasPermi('system:role:list')")
    @GetMapping("/list")
    public TableDataInfo list(SysRole role)
    {
        startPage();
        List<SysRole> list = roleService.selectRoleList(role);

        System.err.println("list后台调用");

        List<SysRole> l = new ArrayList<>();
        for(int i=0;i<list.size();i++){
            l.add(list.get(i));
        }

        WebSocket ws = new WebSocket();
        JSONObject jos = new JSONObject();
        jos.put("message",l);
        jos.put("To","All");
        try{
            ws.onMessage(jos.toJSONString());
        }catch(IOException e){
            e.printStackTrace();
        }
        return getDataTable(list);

    }

开启websocket过滤白名单

package com.ruoyi.framework.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpMethod;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.security.web.authentication.logout.LogoutFilter;
import org.springframework.web.filter.CorsFilter;
import com.ruoyi.framework.security.filter.JwtAuthenticationTokenFilter;
import com.ruoyi.framework.security.handle.AuthenticationEntryPointImpl;
import com.ruoyi.framework.security.handle.LogoutSuccessHandlerImpl;

/**
 * spring security配置
 * 
 * @author ruoyi
 */
@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter
{
    /**
     * 自定义用户认证逻辑
     */
    @Autowired
    private UserDetailsService userDetailsService;
    
    /**
     * 认证失败处理类
     */
    @Autowired
    private AuthenticationEntryPointImpl unauthorizedHandler;

    /**
     * 退出处理类
     */
    @Autowired
    private LogoutSuccessHandlerImpl logoutSuccessHandler;

    /**
     * token认证过滤器
     */
    @Autowired
    private JwtAuthenticationTokenFilter authenticationTokenFilter;
    
    /**
     * 跨域过滤器
     */
    @Autowired
    private CorsFilter corsFilter;
    
    /**
     * 解决 无法直接注入 AuthenticationManager
     *
     * @return
     * @throws Exception
     */
    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception
    {
        return super.authenticationManagerBean();
    }

    /**
     * anyRequest          |   匹配所有请求路径
     * access              |   SpringEl表达式结果为true时可以访问
     * anonymous           |   匿名可以访问
     * denyAll             |   用户不能访问
     * fullyAuthenticated  |   用户完全认证可以访问（非remember-me下自动登录）
     * hasAnyAuthority     |   如果有参数，参数表示权限，则其中任何一个权限可以访问
     * hasAnyRole          |   如果有参数，参数表示角色，则其中任何一个角色可以访问
     * hasAuthority        |   如果有参数，参数表示权限，则其权限可以访问
     * hasIpAddress        |   如果有参数，参数表示IP地址，如果用户IP和参数匹配，则可以访问
     * hasRole             |   如果有参数，参数表示角色，则其角色可以访问
     * permitAll           |   用户可以任意访问
     * rememberMe          |   允许通过remember-me登录的用户访问
     * authenticated       |   用户登录后可访问
     */
    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception
    {
        httpSecurity
                // CSRF禁用，因为不使用session
                .csrf().disable()
                // 认证失败处理类
                .exceptionHandling().authenticationEntryPoint(unauthorizedHandler).and()
                // 基于token，所以不需要session
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()
                // 过滤请求
                .authorizeRequests()
                // 对于登录login 注册register 验证码captchaImage 允许匿名访问
                .antMatchers("/login", "/register", "/captchaImage").anonymous()
                .antMatchers(
                        HttpMethod.GET,
                        "/",
                        "/*.html",
                        "/**/*.html",
                        "/**/*.css",
                        "/**/*.js",
                        "/profile/**"
                ).permitAll()
                .antMatchers("/common/download**").anonymous()
                .antMatchers("/common/download/resource**").anonymous()
                .antMatchers("/swagger-ui.html").anonymous()
                .antMatchers("/swagger-resources/**").anonymous()
                .antMatchers("/webjars/**").anonymous()
                .antMatchers("/*/api-docs").anonymous()
                .antMatchers("/druid/**").anonymous()
                .antMatchers("/websocket/**").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated()
                .and()
                .headers().frameOptions().disable();
        httpSecurity.logout().logoutUrl("/logout").logoutSuccessHandler(logoutSuccessHandler);
        // 添加JWT filter
        httpSecurity.addFilterBefore(authenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        // 添加CORS filter
        httpSecurity.addFilterBefore(corsFilter, JwtAuthenticationTokenFilter.class);
        httpSecurity.addFilterBefore(corsFilter, LogoutFilter.class);
    }

    /**
     * 强散列哈希加密实现
     */
    @Bean
    public BCryptPasswordEncoder bCryptPasswordEncoder()
    {
        return new BCryptPasswordEncoder();
    }

    /**
     * 身份认证接口
     */
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception
    {
        auth.userDetailsService(userDetailsService).passwordEncoder(bCryptPasswordEncoder());
    }
}