websocket实例
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在线聊天室websocket+spring实现
说明
web socket支持长连接，全双工通信。用户在登陆后进入聊天室（与服务器建立连接），可以与其他与服务器建立连接的用户通信。
客户端：chat3.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><link href="${pageContext.request.contextPath}/resources/layoutit/src/css/bootstrap.min.css" rel="stylesheet"><link href="${pageContext.request.contextPath}/resources/layoutit/src/css/style.css" rel="stylesheet"><script src="${pageContext.request.contextPath}/resources/layoutit/src/js/jquery.min.js"></script><script src="${pageContext.request.contextPath}/resources/layoutit/src/js/bootstrap.min.js"></script><title>聊天室</title></head><body><script type="text/javascript"> var websocket; if('WebSocket' in window){ websocket=new WebSocket("ws://localhost:8080/chat_websocket_demo/ws"); } websocket.onopen = function(event) { console.log("WebSocket:已连接"); console.log(event); }; websocket.onmessage = function(event) { var data=JSON.parse(event.data); console.log("WebSocket:收到一条消息",data); $("#content").append("<p style=\"color:green\">"+data.username+"</p><p style=\"color:white\">"+data.msg+"</p>"); }; websocket.onerror = function(event) { console.log("WebSocket:发生错误 "); console.log(event); }; websocket.onclose = function(event) { console.log("WebSocket:已关闭"); console.log(event); } function send(){ var message=$("#message").val(); var data={}; data["username"]="${username}"; data["msg"]=message; $("#content").append("<p style=\"color:red\">"+'${username}'+"</p><p style=\"color:white\">"+message+"</p>"); websocket.send(JSON.stringify(data)); }</script><div class="container-fluid"> <div class="row"> <div class="col-md-3"></div> <div class="col-md-6"> <div class="row"> <div class="col-md-12"> <h2 style="text-align:center">${username},聊天室欢迎你</h2> <!-- 这里显示聊天室的内容 --> <div class="row" id="content" style="height:600px; background-color:gray"></div> </div> </div> <div class="row"> <div class="col-md-12"> <input type="text" name="message" class="form-control" id="message"/> <button type="button" class="btn btn-primary" onclick="send()">提交</button> </div> </div> </div> <div class="col-md-3"></div> </div></div></body></html>服务器端
ChatConfig.java
import javax.annotation.Resource;import org.springframework.stereotype.Component;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import org.springframework.web.socket.config.annotation.EnableWebSocket;import org.springframework.web.socket.config.annotation.WebSocketConfigurer;import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;@Component@EnableWebSocketpublic class ChatConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer{ @Resource private ChatHandler handler; @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { // TODO Auto-generated method stub registry.addHandler(handler, "/ws").addInterceptors(new ChatHandShake()); }}ChatHandler.java
import java.util.HashMap;import java.util.Map;import org.springframework.stereotype.Component;import org.springframework.web.socket.CloseStatus;import org.springframework.web.socket.WebSocketHandler;import org.springframework.web.socket.WebSocketMessage;import org.springframework.web.socket.WebSocketSession;@Componentpublic class ChatHandler implements WebSocketHandler{ private Map<String, WebSocketSession> usermap=new HashMap<String, WebSocketSession>(); //连接关闭后的操作 @Override public void afterConnectionClosed(WebSocketSession wsession, CloseStatus status) throws Exception { System.out.println("用户"+wsession.getAttributes().get("username")+"已经关闭"); for(Map.Entry<String, WebSocketSession>entry:usermap.entrySet()){ String key=entry.getKey(); WebSocketSession value=entry.getValue(); if(key.equals(wsession.getAttributes().get("username"))){ usermap.remove(key); System.out.println("用户"+key+"已经移除"); } } } @Override public void afterConnectionEstablished(WebSocketSession wsession) throws Exception { String uname=(String) wsession.getAttributes().get("username"); System.out.println("用户"+uname+"已经加入"); if(usermap.get(uname)==null){ usermap.put(uname, wsession); } } // message 是前台传过来的json数据，包括用户名，和发送的消息，要将消息转发给所有的其他用户 @Override public void handleMessage(WebSocketSession wsession, WebSocketMessage<?> message) throws Exception { //TextMessage tm=new TextMessage(message.toString()); System.out.println("开始发送消息"+usermap.size()); for(Map.Entry<String,WebSocketSession>entry:usermap.entrySet()){ String key=entry.getKey(); WebSocketSession value=entry.getValue(); if(key!=wsession.getAttributes().get("username")){ if(value!=null&&value.isOpen()){ value.sendMessage(message); } } } } @Override public void handleTransportError(WebSocketSession wsession, Throwable th) throws Exception { if(wsession.isOpen()){ wsession.close(); } for(Map.Entry<String, WebSocketSession>entry:usermap.entrySet()){ String key=entry.getKey(); WebSocketSession value=entry.getValue(); if(key.equals(wsession.getAttributes().get("username"))){ usermap.remove(key); System.out.println("传输出错！用户"+key+"已经移除"); } } } @Override public boolean supportsPartialMessages() { return false; }}ChatHandShake.java
import java.util.Map;import javax.servlet.http.HttpSession;import org.springframework.http.server.ServerHttpRequest;import org.springframework.http.server.ServerHttpResponse;import org.springframework.http.server.ServletServerHttpRequest;import org.springframework.web.socket.WebSocketHandler;import org.springframework.web.socket.server.HandshakeInterceptor;public class ChatHandShake implements HandshakeInterceptor{ @Override public void afterHandshake(ServerHttpRequest arg0, ServerHttpResponse arg1, WebSocketHandler arg2, Exception arg3) { // TODO Auto-generated method stub } @Override public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler handlar, Map<String, Object> map) throws Exception { // TODO Auto-generated method stub System.out.println("用户"+((ServletServerHttpRequest) request). getServletRequest().getSession(false).getAttribute("username")+"已经建立连接"); if(request instanceof ServletServerHttpRequest){ ServletServerHttpRequest srequest=(ServletServerHttpRequest)request; HttpSession session=srequest.getServletRequest().getSession(false); if(session.getAttribute("username")!=null){ map.put("username", session.getAttribute("username")); }else { return false; } } return true; }}配置环境
（1）spring 4.0以上
（2）web 3.0以上
maven pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.springframework.samples.service.service</groupId> <artifactId>chat_websocket_demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <properties> <!-- Generic properties --> <java.version>1.6</java.version> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <!-- Web --> <jsp.version>2.2</jsp.version> <jstl.version>1.2</jstl.version> <servlet.version>2.5</servlet.version> <!-- Spring --> <spring-framework.version>4.0.6.RELEASE</spring-framework.version> <!-- Hibernate / JPA --> <hibernate.version>4.2.1.Final</hibernate.version> <!-- Logging --> <logback.version>1.0.13</logback.version> <slf4j.version>1.7.5</slf4j.version> <!-- Test --> <junit.version>4.11</junit.version> </properties> <dependencies> <!-- Spring MVC --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring-framework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-messaging</artifactId> <version>${spring-framework.version}</version> </dependency> <!-- web socket --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-websocket</artifactId> <version>${spring-framework.version}</version> </dependency> <!-- Spring ORM support --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${spring-framework.version}</version> </dependency> <!-- Other Web dependencies --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>${jstl.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>${servlet.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>${jsp.version}</version> <scope>provided</scope> </dependency> <!-- Spring and Transactions --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring-framework.version}</version> </dependency> <!-- Logging with SLF4J & LogBack --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> <scope>compile</scope> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>${logback.version}</version> <scope>runtime</scope> </dependency> <!-- Hibernate --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>${hibernate.version}</version> </dependency> <!-- Test Artifacts --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring-framework.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <!-- mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.9</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <!-- jackson spring通过response向前台发送数据是转成json格式要用到--> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-core-asl</artifactId> <version>1.9.13</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.5.0</version> </dependency> <!-- http://mvnrepository.com/artifact/org.json/json --> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20160212</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.0.2</version> <configuration> <source>1.7</source> <target>1.7</target> <encoding>utf8</encoding> </configuration> </plugin> </plugins> </build> </project>数据源配置：spring-application.xml
<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd "> <!-- Uncomment and add your base-package here: <context:component-scan base-package="org.springframework.samples.service"/> --><!-- 配置数据源 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/online_chart?useUnicode=true&characterEncoding=UTF-8" /> <property name="username" value="root" /> <property name="password" value="root" /> </bean> <!-- 配置session factory --> <!-- Hibernate 4 SessionFactory Bean definition --> <bean id="hibernate4SessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql">true</prop> </props> </property> <property name="mappingLocations"> <list> <value>classpath:/com/hainan/cs/hbm/*.hbm.xml</value> </list> </property> </bean> <bean id="userdao" class="com.hainan.cs.dao.UserDaoImp"> <property name="sessionFactory" ref="hibernate4SessionFactory"></property> </bean></beans>mvc-config.xml
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd "> <!-- Uncomment and your base-package here:--> <context:component-scan base-package="com.hainan.cs"/> <!-- 让springmvc放过存放静态资源的请求 --> <mvc:resources mapping="/resources/**" location="/resources/" /> <mvc:annotation-driven /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- Example: a logical view name of 'showMessage' is mapped to '/WEB-INF/jsp/showMessage.jsp' --> <property name="prefix" value="/WEB-INF/view/"/> <property name="suffix" value=".jsp"/> </bean></beans>截图
登陆
聊天
其他的文件可以在demo中找到
地址：https://github.com/huangliang992/chat_websocket_demo
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