前端创建链接时官方提供的构造函数
var aWebSocket = new WebSocket(url, [protocols]);
url：要连接的URL；这应该是WebSocket服务器将响应的URL。
protocols：可选；一个协议字符串或者一个包含协议字符串的数组。这些字符串用于指定子协议，这样单个服务器可以实现多个WebSocket子协议（例如，您可能希望一台服务器能够根据指定的协议（protocol）处理不同类型的交互）。如果不指定协议字符串，则假定为空字符串。
websocket携带参数支持两种方式
在url后面拼接，类似以get请求
var socket = new WebSocket('ws://example.com/socket?token=' + YOUR_TOKEN);
使用protocols，token不要有特殊符号之类，逗号，横杠等也不要有，要不前端构造函数会报错
var webSocket = new WebSocket(url，[token]);
后台获取
package cn.bool.business.framework.websocket.core.security;import cn.bool.business.framework.security.core.LoginUser;
import cn.bool.business.framework.security.core.filter.TokenAuthenticationFilter;
import cn.bool.business.framework.security.core.util.SecurityFrameworkUtils;
import cn.bool.business.framework.websocket.core.util.WebSocketFrameworkUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.http.server.ServletServerHttpResponse;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.server.HandshakeInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;/**
* 登录用户的 {@link HandshakeInterceptor} 实现类
*
* 流程如下：
* 1. 前端连接 websocket 时，会通过Sec-WebSocket-Protocol协议传输token
*/
public class LoginUserHandshakeInterceptor implements HandshakeInterceptor {@Overridepublic boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response,WebSocketHandler wsHandler, Map<String, Object> attributes) { // HttpServletRequest req = ((ServletServerHttpRequest) request).getServletRequest();// String header = request.getHeader(WS_LOGIN_USER_HEADER); // 不强转也可以使用 HttpHeaders headers = request.getHeaders();List<String> list = headers.get("Sec-WebSocket-Protocol");if (CollectionUtil.isNotEmpty(list)) {String token = list.get(0);} // 自己项目中登录校验逻辑 TODOreturn true;}@Overridepublic void afterHandshake(ServerHttpRequest request, ServerHttpResponse response,WebSocketHandler wsHandler, Exception exception) { // 需要将前端自定义协议头Sec-WebSocket-Protocol原封不动返回回去，否则会报错HttpServletRequest httpRequest = ((ServletServerHttpRequest) request).getServletRequest();HttpServletResponse httpResponse = ((ServletServerHttpResponse) response).getServletResponse();if (StringUtils.isNotEmpty(httpRequest.getHeader("Sec-WebSocket-Protocol"))) {httpResponse.addHeader("Sec-WebSocket-Protocol", httpRequest.getHeader("Sec-WebSocket-Protocol"));}}}
