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本篇內容介紹了“websocket建立連接時傳遞參數的方法”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！
后臺獲取參數4中方法：
websocket的url
"ws:localhost:82/chat/123?username=ydh";
socket的注釋
@ServerEndpoint("/chat/{param}")socket的open方法
@OnOpen
public void open(Session session, @PathParam("param")String param) {
System.out.println("用戶"+param+" 登錄");
Map<String, String> map = session.getPathParameters();
System.out.println("session.getPathParameters()"+map.toString());
String str = session.getQueryString();
System.out.println("session.getQueryString()"+str);
String uri = session.getRequestURI().toString();
System.out.println("session.getRequestURI().toString()"+uri);
}結果
用戶123 登錄
session.getPathParameters(){param=123}
session.getQueryString()username=baidu
session.getRequestURI().toString()/chat/123?username=baidu1、url站位，通過@PathParam注釋獲取
2、url站位，通過session.getPathParameters()獲取
3、url傳參，通過session.getQueryString()
4、url傳參，通過session.getRequestURI().toString()
從結果可以看出1、2兩個方法不需要截取，可以直接使用；而3、4兩個方法都需要截取字符串，稍微麻煩，但是請求的url比較清爽。
下面的是完整代碼
config代碼
import javax.websocket.Endpoint; import javax.websocket.server.ServerApplicationConfig; import javax.websocket.server.ServerEndpointConfig; import java.util.Set; public class ChatConfig implements ServerApplicationConfig { // 注解 @Override public Set<Class<?>> getAnnotatedEndpointClasses(Set<Class<?>> scanned) { System.out.println("websocket......啟動！"+scanned.size()); return scanned; } // 接口 @Override public Set<ServerEndpointConfig> getEndpointConfigs(Set<Class<? extends Endpoint>> scanned) { return null; } }socket代碼
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
/** * @description: * @author: yangdehong * @version: 2017/6/4. */
@ServerEndpoint("/chat/{param}")
public class ChatSocket {
@OnOpen
public void open(Session session, @PathParam("param")String param) {
System.out.println("用戶"+param+" 登錄");
Map<String, String> map = session.getPathParameters();
System.out.println("session.getPathParameters()"+map.toString());
String str = session.getQueryString();
System.out.println("session.getQueryString()"+str);
String uri = session.getRequestURI().toString();
System.out.println("session.getRequestURI().toString()"+uri);
}
@OnClose
public void close(Session session){
System.out.println("sessionId:"+session.getId()+"關閉");
}
@OnMessage
public void message(Session session, String message, boolean last) throws IOException {
System.out.println("sessionId:"+session.getId()+"-------"+message+"------"+last);
session.getBasicRemote().sendText("接受成功");
}
}模擬登錄servlert
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/** * @description: * @author: yangdehong * @version: 2017/6/3. */
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
request.getSession().setAttribute("username", username);
response.sendRedirect("chat.jsp");
}
}chat.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<script type="text/javascript"> var ws; var target = "ws:localhost:82/chat/123?username=" + '${username}'; window.onload = function () { if ('WebSocket' in window) { ws = new WebSocket(target); } else if ('MozWebSocket' in window) { ws = new MozWebSocket(target); } else { alert('WebSocket is not supported by this browser.'); return; } }; </script>
</head>
<body>
<div id="content">
</div>
<div id="userList">
</div>
</body>
</html>index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>登錄</title> </head> <body> <form action="LoginServlet" method="get"> name:<input name="username"> <input type="submit" /> </form> </body> </html>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <display-name>websocket</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> </web-app>
maven
<dependency> <groupId>javax.websocket</groupId> <artifactId>javax.websocket-api</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>org.apache.tomcat</groupId> <artifactId>tomcat-websocket</artifactId> <version>8.0.26</version> </dependency>
“websocket建立連接時傳遞參數的方法”的內容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業相關的知識可以關注億速云網站，小編將為大家輸出更多高質量的實用文章！
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