Configuration of the DWR framework in Ajax

When configuring DWR, copy the following servlet to the Web. xml configuration file:
<! -- DWR Ajax configuration --> <servlet>
<Servlet-Name> DWR-invoker </servlet-Name>
<Servlet-class> UK. Ltd. getahead. DWR. dwrservlet </servlet-class>
<Init-param>
<Param-Name> config </param-Name>
<Param-value> WEB-INF/DWR. xml </param-value>
</Init-param>
<Init-param>
<Param-Name> debug </param-Name>
<Param-value> true </param-value>
</Init-param>
<Init-param>
<Param-Name> scriptcompressed </param-Name>
<Param-value> false </param-value>
</Init-param>
<Load-on-startup> 1 </load-on-startup>
</Servlet>

Add fitler:
<! -- DWR fitler --> <servlet-mapping>
<Servlet-Name> DWR-invoker </servlet-Name>
<URL-pattern>/DWR/* </url-pattern>
</Servlet-mapping>

To configure the DWR. xml file, you can directly use the bean managed by spring:

<? XML version = "1.0" encoding = "gb2312"?>
<! Doctype DWR public "-// getahead limited // DTD direct Web remoting 1.0 //" http://www.getahead.ltd.uk/dwr/dwr10.dtd ">
<DWR>
<Allow>
<! -- Define your own bean, so you need to convert it, otherwise you don't know -->
<Convert match = "com. sillycat. Core. model. User" converter = "Bean"/>
<! -- The capitalized usermanager is the JS name called on the page -->
<Create creator = "Spring" javascript = "usermanager">
<! -- Usermanager in lower case is the bean name managed by spring -->
<Param name = "beanname" value = "usermanager"/>
<! -- The method exposed by Ajax should only expose some safe methods... -->
<Include method = "getalluser"/>
<Include method = "getuser"/>
<Include method = "saveuser"/>
<Include method = "removeuser"/>
</Create>
</Allow>
</DWR>

When using the page, import three JS files: <SCRIPT type = 'text/JavaScript'
Src = '<% = request. getcontextpath () %>/DWR/interface/usermanager. js'> </SCRIPT>
<SCRIPT type = 'text/JavaScript'
Src = '<% = request. getcontextpath () %>/DWR/engine. js'> </SCRIPT>
<SCRIPT type = 'text/JavaScript'
Src = '<% = request. getcontextpath () %>/DWR/util. js'> </SCRIPT>

JS: function checkuserexist ()...{
If ($ ("logonname"). value = NULL | $ ("logonname"). value = "")...{
Loginnamemessage. innerhtml = "Enter the login name! ";
Return false;
}
Dwrutil. useloadingmessage ("checking .....");
Usermanager. istuserexistbylogonname (usercheckresult, $ ("logonname"). value );
}
 
Function usercheckresult (data )...{
If (Data = true )...{
// Alert ("adsfasdfasdf ");
Document. getelementbyid ("userexistflag"). value = 1;
Loginnamemessage. innerhtml = "the user name has been used! ";
} Else ...{
Alert ("adsfasdf ");
Loginnamemessage. innerhtml = "";
Document. getelementbyid ("userexistflag"). value = "0 ";
}
}

The JS that calls Ajax is:
Usermanager. istuserexistbylogonname (usercheckresult, $ ("logonname"). value );
Usermanager is the JS name. The first parameter is the callback function, and the last parameter is the parameter of the called method.