有关dwr推送的笔记
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有关dwr推送的笔记
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
想做一個web推送相關的東東，昨天搞了一天，終于把這些雜亂的配制弄清了，今天寫出來方便以后記住，也方便大家看一下吧
1：引入dwr包，我用的是maven
<dependency><groupId>org.directwebremoting</groupId><artifactId>dwr</artifactId><version>3.0.M1</version> </dependency>2：配制web.xml
我是在springMVC下進行的
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"version="2.5"><display-name>SmallSP Web Application</display-name><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><listener><listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class></listener><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><servlet><servlet-name>springMVC</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath*:mvc/springMVC.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springMVC</servlet-name><url-pattern>/dwr/*</url-pattern></servlet-mapping><servlet-mapping><servlet-name>springMVC</servlet-name><url-pattern>/</url-pattern></servlet-mapping><servlet-mapping><servlet-name>default</servlet-name><url-pattern>*.js</url-pattern></servlet-mapping><filter><filter-name>Set Encoding</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf8</param-value></init-param></filter><filter-mapping><filter-name>Set Encoding</filter-name><url-pattern>/*</url-pattern></filter-mapping> </web-app>以上代碼中添加的是以下這一段
<servlet-mapping><servlet-name>springMVC</servlet-name><url-pattern>/dwr/*</url-pattern></servlet-mapping> <servlet-mapping>3：配制springMVC.xml
在原有springMVC配制中添加以下
<dwr:configuration /> <dwr:annotation-config id="dwr" /><!-- 要求DWR將util.js和engine.js映射到dwrController --><dwr:url-mapping /><!-- 定義dwr --><dwr:controller id="dwrController" debug="true"><dwr:config-param name="allowScriptTagRemoting" value="true" /><dwr:config-param name="crossDomainSessionSecurity" value="false" /><dwr:config-param name="pollAndCometEnabled " value="true"/><dwr:config-param name="activeReverseAjaxEnabled" value="true"/><dwr:config-param name="debug " value="true"/></dwr:controller>4：配制?RemoteProxy
@Controller @RemoteProxy(name = "directController") public class MyDwrController {@RemoteMethod public String ShowHello(){return "hello";}@RemoteMethodpublic void send(HttpServletRequest request,String msg){ ServletContext sc = request.getSession().getServletContext(); ServerContext sctx = ServerContextFactory.get(sc); //獲得當前瀏覽 index.jsp 頁面的所有腳本session Collection<ScriptSession> sessions = sctx.getScriptSessionsByPage("/show");Util util = new Util(sessions);ScriptBuffer sb = new ScriptBuffer(); sb.appendScript("show("); sb.appendData(msg); sb.appendScript(")"); //推送 util.addScript(sb); //util.addFunctionCall("show", ": " + msg); //dwrtest為javascript函數 } }5：發送頁面
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!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"> <title>123</title> <script type='text/javascript' src='/static/jquery-min.js'></script> <script type='text/javascript' src='<c:url value="/dwr/engine.js"/>'></script> <script type='text/javascript' src='<c:url value="/dwr/util.js" />'></script> <script type='text/javascript' src='<c:url value="/dwr/interface/directController.js" />'></script> <script type="text/javascript"> function view() { directController.ShowHello(function(data) { alert(data); }); } function send(){dwr.engine.setActiveReverseAjax(true); directController.send($("#msg").val()); }</script> </head> <body><input type="text" id="msg" /> <input type="button" value="發送" id="but" οnclick="send();" /> </body> </html>6：接收頁面
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!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"> <title>Insert title here</title> <script type='text/javascript' src='/static/jquery-min.js'></script> <script type='text/javascript' src='<c:url value="/dwr/engine.js"/>'></script> <script type='text/javascript' src='<c:url value="/dwr/util.js" />'></script> <%-- <script type='text/javascript' src='<c:url value="/dwr/interface/directController.js" />'></script> --%><script type="text/javascript"> $(function(){ //這句話千萬不能少 ，表示允許使用推送技術 dwr.engine.setActiveReverseAjax(true); }); //這個函數是提供給后臺推送的時候 調用的 function show(msg){ $("#message").text(msg); } </script></head> <body> <div id="message" style="width: 200px;height: 200px;border: 1px solid red ; text-align: center; padding: 5px;"></div> </body> </html>總結：就是以上步驟了。
轉載于:https://www.cnblogs.com/feiyun126/p/dwr.html
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