DWR用法

最新推荐文章于 2025-08-11 23:19:59 发布

转载最新推荐文章于 2025-08-11 23:19:59 发布 · 2.7k 阅读

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#dwr #class #bean #function #javascript #filter

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步骤

1.将dwr.jar放入lib文件中

2.在jsp页面中咖入引用

前两个文件是必须包括的引擎文件

第三个文件是不固定的,每写一个java类,就要添加一个引用.这里是新建了一个名为QueryFaultListHandler的类

3.修改dwr.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd ">

<dwr>

4.在具体的jsp页面里根据dwr.xml中配置的对象的名字来引用java类

分两种情况:

<a>调用无返回值的方法:例如,在QueryFaultListHandler有一个confirmAllFault(key_uid);

那么在页面中可直接调用.

function deom(key_uid){

QueryFaultListHandler.confirmAllFault(key_uid);

}

<b>有返回值的方法如何调用 ,例如在QueryFaultListHandler有一个confirmAllFault(key_uid);返回一个string类型

那么在页面中这样调用:

function demo(key_uid){

QueryFaultListHandler.confirmAllFault(aaaa,key_uid);

}

function aa(str_return){

//这里的str_return就是confirmAllFault方法的返回值

}

在jsp页面中调用有返回在值的方法时,必须新建一个function();

在调用这个类的public的有返回值的方法时,把新建的function名当做第一个参数转入,以便在这个函数中得到返回数进行处理

附源代码:

java类

------------------------------------------------------------------------------------------ -----------------------

/*
* Created on 2005-9-8
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package com.ubi.rt;

import java.util.Vector;

import com.ubi.util.db.DAO;
import com.ubi.util.db.DAOFactory;
import com.ubi.util.db.table.T_Dynamic_event_17;

/**
* @author Allen
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class QueryFaultListHandler {
public String confirmAllFault(Integer key_uid) {

        try {
            DAO dao = DAOFactory.getDAO("Dynamic_event_17");
            String sql = " datediff(dd,event_occur_time,getdate())<1 and resource_type_uid = 4 and resource_uid ="
                    + key_uid.intValue() + " group by event_level order by event_level";
            Vector vct_fault = dao.select(sql);
            T_Dynamic_event_17 tde = null;
            for (int i = 0; i < vct_fault.size(); i++) {
                tde = (T_Dynamic_event_17) vct_fault.get(i);
                tde.setFault_state(new Integer(2));
                dao.update(tde, tde.getDynamic_event_uid());
            }
        } catch (Exception ex) {
            ex.printStackTrace();
            return "bed";
        }
        return "ok";
    }
}

jsp文件

---------------------------------------------------------------------------------------------------------------------------

<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts- logic.tld" prefix="logic"%>
<%@ taglib uri="/WEB-INF/struts- template.tld" prefix="temp"%>
<%@page pageEncoding="GB2312"%>
<%request.setCharacterEncoding("GB2312");%>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<html:html locale="true"><html:base/>
<head>
<title>事件列表</title>
<link href="../../style/main.css" _fcksavedurl=""../../style/main.css"" rel="stylesheet" type="text/css">
<script src="../../js/seltime.js" language="JavaScript" type="text/JavaScript"></script>
<script type="text/javascript" src="../../scripts/httpObj.js"></script>
<script type='text/javascript' src='../../dwr/engine.js'> </script>
<script type='text/javascript' src='../../dwr/util.js'> </script>
<script type="text/javascript" src="../../dwr/interface/QueryFaultListHandler.js"></script>
<script>
var http = getHTTPObject();
function goToParent(key_uid,type_uid){
var url ="././graphAction.do?method=viewSubNode&key_uid="+key_uid+"&type_uid="+type_uid;
window.location = url;
}
function confrimFault(indexId,uid){
showAddDataXxd(indexId,uid);
}
function confirmAllFault(key_uid){
//sendRequestData(key_uid);
changeTitle();
QueryFaultListHandler.confirmAllFault(changeTab2,key_uid);
}

alert("开始处理");
alert(uid);
var requestDataXxdFunctionId =105;//定义function
alert("m"+m);
alert(requestDataXxdFunctionId);
http.open("GET", "../../rtss?function="+requestDataXxdFunctionId+"&uid="+uid);
http.onreadystatechange = function(){
  if (http.readyState == 4) {
   changeTab2();
  }
}
http.send(null);
}
function showAddDataXxd(inde,uid){

var requestDataXxdFunctionId =104;//定义function
http.open("GET", "../../rtss?function="+requestDataXxdFunctionId+"&uid="+uid);
http.onreadystatechange = function(){
  if (http.readyState == 4) {
   changeTab(inde);
  }
}
http.send(null);
}
function changeTab2(returnStr){
if(returnStr=='ok'){
  var tab = document.getElementById("tab");
  var rs = tab.rows;
  var reCount = (rs.length-3)/2;
  //alert("总行数"+reCount);
  for(var i=0;i<reCount;i++){
   //alert("当前循环到"+i);
   var curIndex = i*2+2;
   //alert("记录所在行"+curIndex);
   var r = rs[curIndex];
   var cs =r.cells;
   //alert("该行所有单位格数"+cs.length);
   if(cs!=null&&cs.length==7){
    cs[4].innerHTML='已确认';
   }
  }
  var r = rs[rs.length-1];
  var cs = r.cells;
  cs[1].innerHTML="<font color=#cccccc>已全部确认</font>";
}

}
function changeTab(ind){
var tab = document.getElementById("tab");
var rs = tab.rows;
var curIndex = ind*2+2;
var r = rs[curIndex];
var cs =r.cells;
cs[4].innerHTML='已确认';
}
</script>
<style type="text/css">

</style>
</head>
<body>
<center>
  <td>
   <table width="680" border="0" cellspacing="0" cellpadding="0" id="tab">
       <%=(request.getAttribute("hasNoItem")==null?"": request.getAttribute("hasNoItem"))%>
    <tr align="left">
      <td colspan="7" class="tdDataValue1">
        拓扑视图 >
      <logic:present name="node_name">
      <bean:write name="node_name" filter="false"/>
      </logic:present>
      >
      <font color="#6699FF">查看故障列表</font></td>
        </tr>
    <tr>
     <td width="8%" class="tdListTitle">故障id</td>
     <td width="25%" class="tdListTitle">故障名称</td>
     <td width="14%" class="tdListTitle">故障级别</td>
     <td width="25%" class="tdListTitle">发生时间</td>
     <td colspan="3" class="tdListTitle">操作</td>
    </tr>
    <logic:present name="graphForm" property="job_vos">
    <logic:iterate id="v1" name="graphForm" property="job_vos" scope="request" indexId="ind">

    <tr onMouseOver="this.style.background='#EAE6DB' " onMouseOut="this.style.background=''">
     <td class="tdListdata1"><bean:write name="v1" property="dynamic_event_uid" filter="true"/></td>
     <td class="tdListdata1"><bean:write name="v1" property="event_name" filter="true"/></td>
     <logic:equal name="v1" property="event_level" value="4">
     <td class="tdListdata1" bgcolor="#FF0000">
     严重
     </td>
     </logic:equal>
     <logic:equal name="v1" property="event_level" value="3">
     <td class="tdListdata1" bgcolor="#FF00CC">
     主要
     </td>
     </logic:equal>
     <logic:equal name="v1" property="event_level" value="2">
     <td class="tdListdata1" bgcolor="#FF9900">
     普通
     </td>
     </logic:equal>
     <logic:equal name="v1" property="event_level" value="1">
     <td class="tdListdata1" bgcolor="#FFFF00">
     次要
     </td>
     </logic:equal>
     <td class="tdListdata1"><bean:write name="v1" property="event_occur_time" filter="true"/></td>
     <td width="9%" class="tdListdata1">
     <logic:notEqual name="v1" property="fault_state" value="2">
     <a href='javascript:confrimFault(<bean:write name="ind"/>,<bean:write name="v1" property="dynamic_event_uid" filter="true"/>)'>确认</a>
     </logic:notEqual>
     <logic:equal name="v1" property="fault_state" value="2">
     已确认
     </logic:equal>
      </td>
        <td width="9%" class="tdListdata1"><a href='javascript:viewKnowledge(<bean:write name="graphForm" property="key_uid"/>,<bean:write name="v1" property="dynamic_event_uid"/>,<bean:write name="v1" property="fault_definition_type"/>)'>知识库</a></td>
        <td width="10%" class="tdListdata1"><a href='javascript:viewDetail(<bean:write name="graphForm" property="key_uid"/>,<bean:write name="v1" property="dynamic_event_uid"/>,<bean:write name="v1" property="res_mon_pnt_inst_event_uid"/>,<bean:write name="v1" property="fault_definition_type"/>,<bean:write name="v1" property="event_level"/>)'>查看详细</a></td>
    </tr>
    <tr>
     <td colspan="7" class="trLine"></td>
    </tr>
    </logic:iterate>
    </logic:present>
    <tr>
     <td height="25" colspan="4" align="left">
     当前共有告警
     <logic:present name="count_total">
     <font color="#FF0000">
     <bean:write name="count_total"/>
     </font>
     </logic:present>
     条严重
     <logic:present name="count_level4">
     <font color="#FF0000">
     <bean:write name="count_level4"/>
     </font>
     </logic:present>
     主要
     <logic:present name="count_level3">
     <font color="#FF0000">
     <bean:write name="count_level3"/>
     </font>
     </logic:present>
     普通
     <logic:present name="count_level2">
     <font color="#FF0000">
     <bean:write name="count_level2"/>
     </font>
     </logic:present>
     次要
     <logic:present name="count_level1">
     <font color="#FF0000">
     <bean:write name="count_level1"/>
     </font>
     </logic:present>
     </td>
        <td height="25" colspan="3" align="center">
     <logic:present name="count_total">
     <logic:greaterThan name="count_total" value="0">
      <a href='javascript:confirmAllFault(<bean:write name="graphForm" property="key_uid"/>);'>确认全部</a>
     </logic:greaterThan>
     </logic:present>
     </td>
    </tr>
   </table>
  </td>
    </tr>
<tr>
  <td align="center">
  <logic:present name="vcCpage">
  <html:pagetag pagename="vcCpage" hidFlag="true" conCode="top;pref;tpage;tnum;tocurpage;next;bottom;" title="首页;上一页;共;总计;第;下一页;末页;" conBlank="top;pref;tpage;tnum;tocurpage;next;bottom;" visible="false"/>
  </logic:present>
  </td>

</tr>
</center>
</body>
</html:html>

dwr.xml文件

web.xml文件

----------------------------------------------

<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>