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在WebWork中实现自己的Result Type

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

飞云小侠 2005-7-27 http://www.jscud.com 转载请注明作者

我在项目中经常用到这样的功能:例如添加完一个文章,我通常会提示用户"操作完成",然后转向到文章列表页面或者文章详情页面.以前的做法是使用WebWork本身的dispatcher结果类型,设置结果页面为信息提示页面,在程序中设置目标页面和提示信息.这样虽然也可以完成我的目标,但是目标页面是在程序里面写死的,无法放在配置里. 这几天研究了一下WebWork的Result Type,发现写一个新的Result Type很容易,于是诞生了我的一个新的Result Type: 功能:信息提示并转向到目标页面

流程:在Action中设置提示信息(当然也可以改到配置文件里,但是配置起来略麻烦,所以还是写在程序里了),然后使用我的结果类型msgto,在配置文件里面配置目标页面.

代码如下 1.页面信息提示类(包含页面提示信息和目标页面,停留时间)

package com.jscud.www.support.web;

/*

* Created Date 2004-11-23

*

*/

/**

* 用于页面提示的信息类.

*

* @author scud

*

*/

public class PageMessage

{

/**标题*/

private String msgTitle;

/**内容体*/

private String msgContent;

/**要转向到的网址*/

private String msgToURL;

/**停留时间*/

private int msgToTime = 1 ;

public String getMsgContent()

{

return msgContent;

}

public void setMsgContent(String msgContent)

{

this.msgContent = msgContent;

}

public String getMsgTitle()

{

return msgTitle;

}

public void setMsgTitle(String msgTitle)

{

this.msgTitle = msgTitle;

}

public int getMsgToTime()

{

return msgToTime;

}

public void setMsgToTime(int msgToTime)

{

this.msgToTime = msgToTime;

}

public String getMsgToURL()

{

return msgToURL;

}

public void setMsgToURL(String msgToURL)

{

this.msgToURL = msgToURL;

}

}

2."msgto" Result Type ,借鉴了WebWork本身的几个ResultType,部分代码是copy过来的 package com.jscud.www.support.web;

//import com.jscud.util.LogMan;

import com.opensymphony.webwork.config.Configuration;

import com.opensymphony.webwork.dispatcher.ServletDispatcher;

import com.opensymphony.webwork.dispatcher.WebWorkResultSupport;

import com.opensymphony.webwork.ServletActionContext;

import com.opensymphony.xwork.ActionContext;

import com.opensymphony.xwork.ActionInvocation;

import com.opensymphony.xwork.util.OgnlValueStack;

import javax.servlet.RequestDispatcher;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/*

* Created on 2005-7-26

*

*/

/**

* WebWork Result Type for "msgto".

*

* Message Hint to User then Refresh to another Page.

*

* @author scud.

*

*/

public class ServletMessageToResult extends WebWorkResultSupport

{

//~ Static fields/initializers /////////////////////////////////////////////

private static final String DefaultMessagePage = "/WEB-INF/public/page/msgto.jsp";

protected String messagePage;

protected boolean prependServletContext = true;

//~ Methods ////////////////////////////////////////////////////////////////

public void setMessagePage(String sPagePath)

{

this.messagePage = sPagePath;

}

public String getMessagePage()

{

if (null == messagePage)

{

if (Configuration.isSet("jscud.page.messageto"))

{

this.messagePage = Configuration.getString("jscud.page.messageto");

}

else

{

this.messagePage = DefaultMessagePage;

}

}

return messagePage;

}

/**

* Sets whether or not to prepend the servlet context path to the redirected URL.

*

* @param prependServletContext <tt>true</tt> to prepend the location with the servlet context path,

* <tt>false</tt> otherwise.

*/

public void setPrependServletContext(boolean prependServletContext) {

this.prependServletContext = prependServletContext;

}

/**

* Dispatches to the Message Page. Does its forward via a RequestDispatcher. If the

* dispatch fails a 404 error will be sent back in the http response.

*

* @param finalLocation the location to dispatch to.

* @param invocation the execution state of the action

* @throws Exception if an error occurs. If the dispatch fails the error will go back via the

* HTTP request.

*/

public void doExecute(String finalLocation, ActionInvocation invocation)

throws Exception

{

String messageLocation = getMessagePage();

HttpServletRequest request = ServletActionContext.getRequest();

HttpServletResponse response = ServletActionContext.getResponse();

RequestDispatcher dispatcher = request.getRequestDispatcher(messageLocation);

// if the view doesn't exist, let's do a 404

if (dispatcher == null)

{

response.sendError(404, "message page '" + messageLocation + "' not found");

return;

}

request.setAttribute("webwork.view_uri", messageLocation);

request.setAttribute("webwork.request_uri", request.getRequestURI());

//set refresh target url

if (isPathUrl(finalLocation))

{

if (!finalLocation.startsWith("/"))

{

String actionPath = request.getServletPath();

String namespace = ServletDispatcher

.getNamespaceFromServletPath(actionPath);

if ((namespace != null) && (namespace.length() > 0))

{

finalLocation = namespace + "/" + finalLocation;

}

else

{

finalLocation = "/" + finalLocation;

}

}

// if the URL's are relative to the servlet context, append the servlet context path

if (prependServletContext && (request.getContextPath() != null)

&& (request.getContextPath().length() > 0))

{

finalLocation = request.getContextPath() + finalLocation;

}

finalLocation = response.encodeRedirectURL(finalLocation);

}

//LogMan.debug("Refreshing to finalLocation " + finalLocation);

//设置属性

OgnlValueStack stack = ActionContext.getContext().getValueStack();

PageMessage aPageMessage = (PageMessage)stack.findValue("pagemessage",PageMessage.class);

if(null!=aPageMessage)

{

aPageMessage.setMsgToURL(finalLocation);

}

dispatcher.forward(request, response);

}

//copy from ServletRedirectResult

private static boolean isPathUrl(String url)

{

// filter out "http:", "https:", "mailto:", "file:", "ftp:"

// since the only valid places for : in URL's is before the path specification

// either before the port, or after the protocol

return (url.indexOf(':') == -1);

}

}

3.信息提示页面 缺省为/WEB-INF/public/page/msgto.jsp,可以在webwork.properties里面配置"jscud.page.messageto",还可以通过配置文件配置.

可以根据自己需要更改页面内容.

<%@ page contentType="text/html; charset=GBK" %>

<%@ taglib uri="webwork" prefix="ww" %>

<html>

<head>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="Cache-Control" content="no-cache, must-revalidate">

<meta http-equiv="expires" content="0">

<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<meta http-equiv="refresh" content="<ww:property value="pagemessage.msgToTime" />;URL=<ww:property value="pagemessage.msgToURL" />">

<title><ww:property value="pagemessage.msgTitle" /></title>

</head>

<body >

<div align=center>

<table width=90% border="0" cellspacing="0" cellpadding="0" align="center" bgcolor=#ffffff>

<tr valign="top">

<td width="2">

</td>

<td width="5"></td>

<td colspan="3">

<center><br><br>

<table align="center" border="0" cellpadding="5" cellspacing="0" width="100%">

<tbody>

<tr>

<td><ww:property value="pagemessage.msgTitle" />

<hr noshade size="1" color="#808000">

</td>

</tr>

<tr>

<td><ww:property value="pagemessage.msgContent" /><br><br><br>

请稍后......<br>

</td>

</tr>

</tbody>

</table>

</center>

</td>

</tr>

</table>

</div>

</body>

</html>

4.配置示例 <result-types>

<result-type name="msgto" class="com.jscud.www.support.web.ServletMessageToResult" />

</result-types>

<action name="doAddCata" class="catagoryAction" method="doSet">

<result name="input" type="dispatcher">

<param name="location">/WEB-INF/jsp/news/catagory_add.jsp</param>

</result>

<result name="success" type="msgto">

<param name="location">/news/admin/admin.jspa</param>

</result>

</action>

5.Action中的代码示例 /**

* 增加/编辑类别

*

* @return 结果

*/

public String doSet()

{

//输入界面

if (null == catagory)

{

return INPUT;

} catagoryManager.updateCatagory(getCatagory(), getWork());

//return goException("设置分类时发生了错误",ex); setPageMessageProp("操作成功", "操作成功"); return SUCCESS;

}

以下代码放在基础Action里:(自己要做适当修改)

/**

* 设置信息提示的内容.

*

* @param sTitle

* @param sHintMsg

*/

protected void setPageMessageProp(String sTitle, String sHintMsg)

{

PageMessage apm = new PageMessage(); if ((null == sTitle) || (sTitle.equals("")))

{

sTitle = getText("core.errorhint.title.default");

} apm.setMsgTitle(sTitle);

apm.setMsgContent(sHintMsg); setPagemessage(apm);

} /**

* 设置信息提示的参数.(转向)

*

* @param sTitle

* @param sHintMsg

* @param toURL

* @param nToTime

*/

protected void setPageMessageProp(String sTitle, String sHintMsg,int nToTime)

{

PageMessage apm = new PageMessage(); if ((null == sTitle) || (sTitle.equals("")))

{

sTitle = getText("core.errorhint.title.default");

} apm.setMsgTitle(sTitle);

apm.setMsgContent(sHintMsg);

//apm.setMsgToURL(toURL);

apm.setMsgToTime(nToTime); setPagemessage(apm);

}

public PageMessage getPagemessage()

{

return pagemessage;

} public void setPagemessage(PageMessage pagemessage)

{

this.pagemessage = pagemessage;

}

ok,很简单,不是吗?

 
 
 
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