一、引入websocket的pom

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

二、 websocket的配置类

package com.jzq.server.config.webSocket;

import com.jzq.server.config.security.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;


@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;

    /**
     * 添加的这个Endpoint，这样可以在网页通过websocket链接上服务
     * 也就是我们配置的websocket的服务地址，并且可以指定是否使用socketJS
     * @param registry
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /**
         * 1. 将ws/ep 路径注册为stomp的端点， 用户连接了这个端点就可以进行websocket通讯，支持socketJs
         * 2. setAllowedOrigins("*")： 允许跨域
         * 3. withSockJs(): 支持socketJS访问
         */

        registry.addEndpoint("/ws/ep").setAllowedOrigins("*").withSockJS();
    }

    /**
     * 输入通道参数配置
     * @param registration
     */
    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {
                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);

                // 判断是否为连接，如果是， 需要获取token， 并且设置用户对象。
                if (StompCommand.CONNECT.equals(accessor.getCommand())) {
                    String token = accessor.getFirstNativeHeader("Auth-token");
                    if (!StringUtils.isEmpty(token)) {
                        String authToken = token.substring(tokenHead.length());
                        String username = jwtTokenUtil.getUserNameFromToken(authToken);

                        // token中存在用户名
                        if (!StringUtils.isEmpty(username)) {
                            // 登录
                            UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                            // 验证token是否有效， 重新设置用户对象
                            if (jwtTokenUtil.validateToken(authToken, userDetails)) {
                                UsernamePasswordAuthenticationToken authenticationToken =
                                        new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                                SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                                accessor.setUser(authenticationToken);
                            }
                        }
                    }
                }
                return message;
            }
        });
    }

    /**
     * 配置消息代理
     * @param registry
     */
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        // 配置代理域， 可以配置多个， 配置代理目的，前缀为 /queue， 可以在配置域上向客户推送消息
        registry.enableSimpleBroker("/queue");
    }
}

三、 websocket发送消息的pojo

package com.jzq.server.pojo;

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;

/**
 * 消息
 */

@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
public class ChatMsg {

    private String from;
    private String to;
    private String content;
    private LocalDateTime date;
    private String formNickName;
}

四、 websocket的连接controller

?知识点：注意注解为@MessageMapping(“路由路径”)

package com.jzq.server.controller;

import com.jzq.server.pojo.Admin;
import com.jzq.server.pojo.ChatMsg;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.simp.SimpMessagingTemplate;
import org.springframework.security.core.Authentication;

import java.time.LocalDateTime;

public class WsController {
    @Autowired
    private SimpMessagingTemplate simpMessagingTemplate;


    @MessageMapping("/ws/chat")
    public void handleMsg(Authentication authentication, ChatMsg chatMsg) {
        Admin admin = (Admin) authentication.getPrincipal();
        chatMsg.setFrom(admin.getUsername());
        chatMsg.setFormNickName(admin.getName());
        chatMsg.setDate(LocalDateTime.now());
        simpMessagingTemplate.convertAndSendToUser(chatMsg.getTo(), "/queue/chat", chatMsg);
    }
}