核心提示：Dwr快速入门引入jar包：Web.xml配置dwrservletservlet-namedwr-invoker/servlet-nameservlet-classorg.directwebremot...
Dwr快速入门
引入jar包：
Web.xml配置dwr
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<param-name>debug</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>
<init-param>
<param-name>activeReverseAjaxEnabled</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
在web.xml同级目录新建个dwr.xml
<?xml version="1.0"encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting3.0//EN" "https://getahead.org/dwr/dwr30.dtd">
<dwr>
<allow>
<!--配置的一个演示类，JavaScript="Demo" 表示可以在页面中用Demo这个名称指向DwrDemo这个Java类，类中的方法可以在前台调用 -->
<!-- creater="new"表示每调用一次时,都需要new一个 -->
<create creator="new" javascript="DwrTest">
<param name="class"value="com.th.dwr.DwrTest"/>
</create>
<!-- java类库类 -->
<create creator="new" javascript="MyDate">
<param name="class"value="java.util.Date"/>
</create>
<!-- 测试阶段使用，运营阶段不要使用 -->
<!-- convert元素用于数据类型转换，即java类和javascript之间相互转换
<convertconverter="exception" match="java.lang.Exception" />
<convert converter="bean"match="java.lang.StackTraceElement" />
-->
</allow>
</dwr>
新建DwrTest类：
import java.util.Collection;
import org.directwebremoting.ScriptBuffer;
import org.directwebremoting.WebContext;
import org.directwebremoting.WebContextFactory;
import org.directwebremoting.proxy.dwr.Util;
public class DwrTest {
public voidsend(String msg){
WebContextwebContext = WebContextFactory.get();
Collectionsessions = webContext.getAllScriptSessions();
ScriptBuffersb = newScriptBuffer();
sb.appendScript("callback(");
sb.appendScript(msg);
sb.appendScript(")");
Utilutil = newUtil(sessions);
util.addScript(sb);
}
}
Jsp
//前两个js固定不变，第三个js引入自己类同名的js
<scripttype='text/javascript'src='${pageContext.request.contextPath}/dwr/engine.js'></scrit>
<script type='text/javascript'src='${pageContext.request.contextPath}/dwr/util.js'></script>
<scriptlanguage="javascript"src="${pageContext.request.contextPath}/dwr/interface/DwrTest.js"> </script>
<script type='text/javascript'src='<%=request.getContextPath() %>/js/jQuery-3.1.1.min.js'></script>
<script type="text/javascript">
$(document).ready(
function(){
dwr.engine.setActiveReverseAjax(true);
$('#sign').click(function(){
DwrTest.send($('#msg').val());
})
}
);
functioncallback(msg){
$('#ul').html($('#ul').html() + "<br/>" + msg);
}
</script>
</head>
<body>
<ul id="ul"style="color:red;font-size: 50px;"></ul>
<input type="text"name="msg"id="msg"size="30"style="height50px;font-size: 35px;">
<input type="button"id="sign"value="发布信息">
</body>
