2019-02-01 09:50:53 +08:00

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spring websocketxml配置方式

目录

一、说明
    1.1 项目结构说明
    1.2 依赖说明
二、spring websocket
        2.1 创建消息处理类继承自TextWebSocketHandler
        2.2 创建websocket 握手拦截器(如果没有权限拦截等需求,这一步不是必须的)
        2.3 配置websocket
        2.4 前端 websocket 的实现
        2.5 简单登录的实现

正文

一、说明

1.1 项目结构说明

  1. 项目模拟一个简单的群聊功能为区分不同的聊天客户端登录时候将临时用户名存储在session当中
  2. CustomHander为消息的自定义处理器
  3. CustomHandershakerInterceptor为自定义的 websocket 的握手拦截器;
  4. 项目以web的方式构建。

1.2 依赖说明

除了基本的spring 依赖外还需要导入webSocket的依赖包

 <!--spring webSocket 的依赖包 -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-websocket</artifactId>
    <version>5.1.3.RELEASE</version>
</dependency>

二、spring websocket

2.1 创建消息处理类继承自TextWebSocketHandler

/**
 * @author : heibaiying
 * @description : 自定义消息处理类
 */
public class CustomHandler extends TextWebSocketHandler {

    private Map<String, WebSocketSession> nameAndSession = new ConcurrentHashMap<>();

    // 建立连接时候触发
    @Override
    public void afterConnectionEstablished(WebSocketSession session)  {
        String username = getNameFromSession(session);
        nameAndSession.putIfAbsent(username, session);
    }


    // 关闭连接时候触发
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) {
        String username = getNameFromSession(session);
        nameAndSession.remove(username);
    }

    // 处理消息
    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        // 防止中文乱码
        String msg = URLDecoder.decode(message.getPayload(), "utf-8");
        String username = getNameFromSession(session);
        // 简单模拟群发消息
        TextMessage reply = new TextMessage(username + " : " + msg);
        nameAndSession.forEach((s, webSocketSession)
                -> {
            try {
                webSocketSession.sendMessage(reply);
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
    }


    private String getNameFromSession(WebSocketSession session) {
        Map<String, Object> attributes = session.getAttributes();
        return (String) attributes.get(Constant.USER_NAME);
    }
}

2.2 创建websocket 握手拦截器(如果没有权限拦截等需求,这一步不是必须的)

/**
 * @author : heibaiying
 * @description : 可以按照需求实现权限拦截等功能
 */
public class CustomHandshakeInterceptor extends HttpSessionHandshakeInterceptor {

    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
        InetSocketAddress remoteAddress = request.getRemoteAddress();
        InetAddress address = remoteAddress.getAddress();
        System.out.println(address);
        /*
         * 最后需要要显示调用父类方法父类的beforeHandshake方法
         * 把ServerHttpRequest 中session中对应的值拷贝到WebSocketSession中。
         * 如果我们没有实现这个方法我们在最后的handler处理中 是拿不到 session中的值
         * 作为测试 可以注释掉下面这一行 可以发现自定义处理器中session的username总是为空
         */
        return super.beforeHandshake(request, response, wsHandler, attributes);
    }
}

2.3 配置websocket

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:websocket="http://www.springframework.org/schema/websocket"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
        http://www.springframework.org/schema/websocket
        http://www.springframework.org/schema/websocket/spring-websocket.xsd">

    <!-- 开启注解包扫描-->
    <context:component-scan base-package="com.heibaiying.*"/>

    <!--使用默认的Servlet来响应静态文件 -->
    <mvc:default-servlet-handler/>

    <!-- 开启注解驱动 -->
    <mvc:annotation-driven/>

    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--配置webSocket-->
    <bean id="customHandler" class="com.heibaiying.websocket.CustomHandler"/>
    <websocket:handlers>
        <!--指定webSocket 地址-->
        <websocket:mapping path="/socket" handler="customHandler"/>
        <!--webSocket握手-->
        <websocket:handshake-interceptors>
            <bean class="com.heibaiying.websocket.CustomHandshakeInterceptor"/>
        </websocket:handshake-interceptors>
    </websocket:handlers>

</beans>

2.4 前端 websocket 的实现

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>${sessionScope.get("username")}您好!欢迎进入群聊大厅!</title>
</head>
<body>
<input id="message" type="text">
<button id="btn">发送消息</button>
<div id="show">

</div>
<script>
    let btn = document.getElementById("btn");
    let message = document.getElementById("message");
    let show = document.getElementById("show");
    let ws = new WebSocket("ws://localhost:8080/socket");
    ws.onmessage = function (evt) {
        let node = document.createElement("div");
        node.innerHTML = "<h5>" + evt.data + "</h5>";
        show.appendChild(node);
    };
    btn.addEventListener("click", function () {
        let data = message.value;
        console.log(data);
        if (data) {
            ws.send(encodeURI(data));
        } else {
            alert("请输入消息后发送");
        }
        message.value = "";
    });
    // 关闭页面时候关闭ws
    window.addEventListener("beforeunload", function(event) {
        ws.close();
    });
</script>
</body>
</html>

2.5 简单登录的实现

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/login" method="post">
    <input name="username" type="text">
    <button id="btn">输入临时用户名后登录</button>
</form>
</body>
</html>
@Controller
public class LoginController {

    @PostMapping("login")
    public String login(String username, HttpSession session){
        session.setAttribute(Constant.USER_NAME,username);
        return "chat";
    }
}