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我在項目中經常用到這樣的功能:例如添加完一個文章,我通常會提示用戶"操作完成",然后轉向到文章列表頁面或者文章詳情頁面.以前的做法是使用WebWork本身的dispatcher結果類型,設置結果頁面為信息提示頁面,在程序中設置目標頁面和提示信息.這樣雖然也可以完成我的目標,但是目標頁面是在程序里面寫死的,無法放在配置里.
這幾天研究了一下WebWork的Result Type,發現寫一個新的Result Type很容易,于是誕生了我的一個新的Result Type:
功能:信息提示并轉向到目標頁面
流程:在Action中設置提示信息(當然也可以改到配置文件里,但是配置起來略麻煩,所以還是寫在程序里了),然后使用我的結果類型msgto,在配置文件里面配置目標頁面.
代碼如下
1.頁面信息提示類(包含頁面提示信息和目標頁面,停留時間)
package com.jscud.www.support.web;
/*
* Created Date 2004-11-23
*
*/
/**
* 用于頁面提示的信息類.
*
* @author scud
*
*/
public class PageMessage
{
/**標題*/
private String msgTitle;
/**內容體*/
private String msgContent;
/**要轉向到的網址*/
private String msgToURL;
/**停留時間*/
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;
}
}
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2."msgto" Result Type ,借鑒了WebWork本身的幾個ResultType,部分代碼是copy過來的
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);
//設置屬性
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);
}
}
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3.信息提示頁面
缺省為/WEB-INF/public/page/msgto.jsp,可以在webwork.properties里面配置"jscud.page.messageto",還可以通過配置文件配置.
可以根據自己需要更改頁面內容.
<%@ 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>
請稍后......<br>
</td>
</tr>
</tbody>
</table>
</center>
</td>
</tr>
</table>
</div>
</body>
</html>
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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中的代碼示例
/**
* 增加/編輯類別
*
* @return 結果
*/
public String doSet()
{
//輸入界面
if (null == catagory)
{
return INPUT;
}
catagoryManager.updateCatagory(getCatagory(), getWork());
//return goException("設置分類時發生了錯誤",ex);
setPageMessageProp("操作成功", "操作成功");
return SUCCESS;
} |
以下代碼放在基礎Action里:(自己要做適當修改)
/**
* 設置信息提示的內容.
*
* @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);
}
/**
* 設置信息提示的參數.(轉向)
*
* @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;
}
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ok,很簡單,不是嗎?