下載地址

http://www.directwebremoting.org/dwr/

https://github.com/directwebremoting/dwr/releases

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本文以DWR3.0.0為例，搭建步驟如下

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1.下載zip文件包，項目引入dwr3.0.0jar文件

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2.web.xml增加如下配置?

<servlet><servlet-name>dwr-invoker</servlet-name><!-- 舊版本用org.directwebremoting.servlet.DwrServlet 新版本用uk.ltd.getahead.dwr.DWRServlet --><servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class><init-param><param-name>debug</param-name><param-value>true</param-value></init-param><init-param><param-name>activeReverseAjaxEnabled</param-name><param-value>true</param-value></init-param><init-param><param-name>crossDomainSessionSecurity</param-name><param-value>false</param-value></init-param><init-param><param-name>allowScriptTagRemoting</param-name><param-value>true</param-value></init-param></servlet><servlet-mapping><servlet-name>dwr-invoker</servlet-name><url-pattern>/js/dwr/*</url-pattern></servlet-mapping>

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3.與web.xml同級下增加一個dwr.xml文件

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://directwebremoting.org/schema/dwr30.dtd"> <dwr><allow><!-- 產生的Js的名稱,與前端調用名稱一致 --><create creator="new" javascript="mydwr"><param name="class" value="com.zns.test.dwr.MyDwr" /></create></allow> </dwr>

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4.增加一個MyDwr類文件

package com.zns.test.dwr;import java.util.ArrayList; import java.util.Collection; import java.util.List; import org.directwebremoting.Browser; import org.directwebremoting.ScriptBuffer; import org.directwebremoting.ScriptSession; import com.zns.test.common.DwrUtils;public class MyDwr {public String func1(String name) {return "hello: " + name;}public void func2() {Runnable run = new Runnable() {private ScriptBuffer scriptBuffer = new ScriptBuffer();public void run() {// 設置要調用的 js函數及參數scriptBuffer.appendCall("addNum", 10, 20);// 得到所有ScriptSessionCollection<ScriptSession> sessions = Browser.getTargetSessions();// 遍歷每一個ScriptSessionfor (ScriptSession scriptSession : sessions) {scriptSession.addScript(scriptBuffer);}}};// 執行推送 Browser.withAllSessions(run);// 或者如下方式調用String jsFuncName = "addNum";List args = new ArrayList();args.add(10);args.add(20);DwrUtils.invokeJavascriptFunction(jsFuncName, args);} }

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5.增加一個DwrUtils工具類

package com.zns.test.common;import java.util.Collection; import java.util.List; import org.directwebremoting.Browser; import org.directwebremoting.ScriptBuffer; import org.directwebremoting.ScriptSession;public class DwrUtils {/*** 調用頁面javascript函數* * @param functionName* 函數名* @param args* 參數列表*/public static void invokeJavascriptFunction(String _funcName, List _args) {final String funcName = _funcName;final List args = _args;Browser.withAllSessions(new Runnable() {private ScriptBuffer script = new ScriptBuffer();public void run() {// 拼接javascriptscript = script.appendScript(funcName + "(");for (int i = 0; i < args.size(); i++) {if (i != 0) {script = script.appendScript(",");}script = script.appendData(args.get(i));}script.appendScript(")");// System.out.println(script.toString());Collection<ScriptSession> sessions = Browser.getTargetSessions();for (ScriptSession scriptSession : sessions) {scriptSession.addScript(script);}}});} }

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6 增加一個jsp頁面測試，核心代碼如下

<script src="js/jquery.min.js" type="text/javascript"></script> <script src="js/dwr/engine.js" type="text/javascript"></script> <script src="js/dwr/interface/mydwr.js" type="text/javascript"></script> <script type="text/javascript">$(function(){dwr.engine.setActiveReverseAjax(true);mydwr.func1("zns",callback1);mydwr.func2();});function callback1(data){alert(data);}function addNum(num1,num2){var total= num1+num2;alert(total);} </script>

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7.訪問jsp頁面 測試效果，基本完畢......

轉載于:https://www.cnblogs.com/zengnansheng/p/10385813.html

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