步骤：
导入 dwr.jar 和commons-logging-1.1.1.jar 包，因为dwr依赖与commons-logging-1.1.1.jar
web.xml 中配置 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> </servlet> <servlet-mapping> <servlet-name>dwr-invoker</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping>
3. 新建需要 js 调用的 java类 DwrHello.java
packagecom;
publicclassDwrHello{
publicStringhello(Stringworld){
System.out.println("hello"+world);
return"hello"+world;
}
}
4. web-inf 下新建一个 dwr.xml,如下：
<?xmlversion="1.0"encoding="UTF-8"?> <!DOCTYPEdwrPUBLIC "-//GetAheadLimited//DTDDirectWebRemoting2.0//EN" "http://getahead.org/dwr/dwr20.dtd"> <dwr> <allow> <createcreator="new"javascript="DwrHello"> <paramname="class"value="com.DwrHello"/> </create> </allow> </dwr>
5. 新建 index.jsp
<%@pagelanguage="java"import="java.util.*"pageEncoding="utf-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">
<title>DWRDEMO</title>
</head>
<scripttype='text/javascript'src='dwr/engine.js'></script>
<scripttype='text/javascript'src='dwr/util.js'></script>
<scripttype="text/javascript"src="dwr/interface/DwrHello.js"></script>
<scripttype="text/javascript">
DwrHello.hello("世界",function(data){
alert(data);
});
</script>
<body>
</body>
</html>
注意：
engine.js/util.js必须如上面所写
DwrHello.js 对应的是DwrHello.java ，在 dwr.xml 中配置的。
DwrHello.hello("世界"); 这样即可调用DwrHello.java 中的hello(String world) 方法。
DwrHello.hello("世界",function(data){
alert(data);
