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dwr簡介--一個例子(續)

系統 1612 0
抱歉這篇才寫。上班沒有多少時間啊！
TableModelBean.java 這是核心業務類，既要被Action使用又要被dwr使用。
由于我注釋寫了一些，所以就不詳細介紹了
public ? class ?TableModelBean? {
????
???? // 表格的第一列
???? public ? static ?final? int ?COLUMN_1? = ? 0 ;
????
???? // 表格的第二列
???? public ? static ?final? int ?COLUMN_2? = ? 1 ;
????
???? // 表格的第三列
???? public ? static ?final? int ?COLUMN_3? = ? 2 ;

???? // 每一列的排序升序降序標記?true升序,false降序
???? private ?boolean[]?columnFlags? = ? {? false ,? false ,? false ?} ;
????
???? // 表格分頁總頁面數
???? private ? int ?totalPage? = ? 0 ;
????
???? // 表格當前頁
???? private ? int ?currentPage? = ? 0 ;
????
???? // 表格總行數
???? private ? int ?rowsCount? = ? 0 ;

???? // 沒用
???? private ?String[]?pagers? = ? {? "" ?} ;

???? // 存放全體記錄的容器
???? private ?List?rows? = ? new ?ArrayList();

???? // 存放當前記錄的容器
???? private ?List?currentPageRows? = ? new ?ArrayList();

???? // 數據庫操作類
???? private ? static ?ModelOneDAO?dao;

???? // 每頁記錄數設為20
???? private ? static ?final? int ?PAGE_SIZE? = ? 20 ;

???? // 初始排序行為第一行
???? private ? int ?sortedColumn? = ? 1 ;

???? /**/ /* *
?????*??構造函數
????? */
???? public ?TableModelBean()? {
????????dao? = ? new ?ModelOneDAO();
????????init();
????}

???? /**/ /* *
?????*??初始化
????? */
???? private ? void ?init()? {
???????? try ? {
????????????rows? = ?dao.getSortedRows(sortedColumn,?columnFlags[sortedColumn]);
????????????setRowsCount(rows.size());
????????????setTotalPage(getTotalPageByRow(rows.size(),?PAGE_SIZE));
????????????setCurrentPage( 1 );
????????} ? catch ?(SQLException?e)? {
???????????? // ?TODO?Auto-generated?catch?block
????????????e.printStackTrace();
????????}
????}

???? /**/ /* *
?????*?返回當前頁的內容
?????*?@return?Returns?the?currentPage.
????? */
???? public ? int ?getCurrentPage()? {
???????? return ?currentPage;
????}

???? /**/ /* *
?????*?設置當前頁
?????*?@param?currentPage
?????*????????????The?currentPage?to?set.
????? */
???? public ? void ?setCurrentPage( int ?currentPage)? {
???????? this .currentPage? = ?currentPage;

????????currentPageRows.clear();
???????? int ?firstIndex? = ?PAGE_SIZE? * ?(currentPage? - ? 1 );
???????? int ?lastIndex? = ?(firstIndex? + ?PAGE_SIZE)? < ?rowsCount? ? ?firstIndex
???????????????? + ?PAGE_SIZE?:?rowsCount;
???????? for ?( int ?i? = ?firstIndex;?i? < ?lastIndex;?i ++ )? {
????????????currentPageRows.add(rows. get (i));
????????}
????}

???? /**/ /* *
?????*?取得所有行
?????*?@return?Returns?the?rows.
????? */
???? public ?List?getRows()? {
???????? return ?rows;
????}


???? /**/ /* *
?????*?取的分頁數
?????*?@return?Returns?the?totalPage.
????? */
???? public ? int ?getTotalPage()? {
????????init();
???????? return ?totalPage;
????}

???? /**/ /* *
?????*?設置分頁數
?????*?@param?totalPage
?????*????????????The?totalPage?to?set.
????? */
???? public ? void ?setTotalPage( int ?totalPage)? {
???????? this .totalPage? = ?totalPage;
????}

???? /**/ /* *
?????*?取得紀錄數
?????*?@return?Returns?the?totalRows.
????? */
???? public ? int ?getRowsCount()? {
???????? return ?rowsCount;
????}

???? /**/ /* *
?????*????設置記錄數
?????*??@param?totalRows
?????*????????????The?totalRows?to?set.
????? */
???? public ? void ?setRowsCount( int ?rowsCount)? {
???????? this .rowsCount? = ?rowsCount;
????}

???? /**/ /* *
?????*?取得當前頁中的記錄數
?????*?@return?Returns?the?currentPageRows.
????? */
???? public ?List?getCurrentPageRows()? {
???????? return ?currentPageRows;
????}

???? /**/ /* *
?????*?取得page頁中的記錄，當page大于totalPage時返回最后頁
?????*?因為是上面的getCurrentPageRows函數的重載，所以在dwr中不能正常使用。
?????*?于是出現了getRowsByPageNo方法。
?????*?@param?page
?????*?@return?the?currentPageRows.
????? */
???? public ?List?getCurrentPageRows( int ?page)? {
????????currentPageRows.clear();
???????? int ?firstIndex? = ?PAGE_SIZE? * ?(page? - ? 1 );
???????? int ?lastIndex? = ?(firstIndex? + ?PAGE_SIZE)? < ?rowsCount? ? ?firstIndex
???????????????? + ?PAGE_SIZE?:?rowsCount;
???????? for ?( int ?i? = ?firstIndex;?i? < ?lastIndex;?i ++ )? {
????????????currentPageRows.add(rows. get (i));
????????}
???????? return ?currentPageRows;
????}

???? /**/ /* *
?????*?取得page頁中的記錄，當page大于totalPage時返回最后頁
?????*?@param?page
?????*?@return?包含當前頁記錄的List
????? */
???? public ?List?getRowsByPageNo( int ?page)? {
????????init();
????????page? = ?page? > ?totalPage? ? ?totalPage?:?page;
????????List?result? = ? new ?ArrayList();
???????? int ?firstIndex? = ?PAGE_SIZE? * ?(page? - ? 1 );
???????? int ?lastIndex? = ?(firstIndex? + ?PAGE_SIZE)? < ?rowsCount? ? ?firstIndex
???????????????? + ?PAGE_SIZE?:?rowsCount;
???????? for ?( int ?i? = ?firstIndex;?i? < ?lastIndex;?i ++ )? {
????????????result.add(rows. get (i));
????????}
???????? return ?result;
????}

???? /**/ /* *
?????*?按照某一列進行排序，再返回當前頁中的數據
?????*?@param?currentPage
?????*?@param?columnNo
?????*?@return?the?Rows?of?current?Page?that?sorted?by?columnNo
????? */
???? public ?List?getCurrentPageSortedByColumnRows( int ?currentPage,? int ?columnNo)? {
????????init();
????????sortBy(columnNo);
????????currentPageRows.clear();
???????? int ?firstIndex? = ? 20 ? * ?(currentPage? - ? 1 );
???????? int ?lastIndex? = ?(firstIndex? + ? 20 )? < ?rowsCount? ? ?firstIndex? + ? 20
????????????????:?rowsCount;
???????? for ?( int ?i? = ?firstIndex;?i? < ?lastIndex;?i ++ )? {
????????????currentPageRows.add(rows. get (i));
????????}
???????? return ?currentPageRows;
????}

???? /**/ /* *
?????*?返回一個分頁數組。用處不太大，客戶端用Javascript也可以計算。
?????*?@return?Returns?the?pages.
????? */
???? public ?String[]?getPagers()? {
????????pagers? = ? new ?String[totalPage];
???????? for ?( int ?i? = ? 1 ;?i? <= ?totalPage;?i ++ )? {
????????????pagers[i? - ? 1 ]? = ?i? + ? "" ;
????????}
???????? return ?pagers;
????}

???? /**/ /* *
?????*?按照某一列進行排序
?????*?@param?columnNo
????? */
???? public ? void ?sortBy( int ?columnNo)? {
???????? this .sortedColumn? = ?columnNo;
????????columnFlags[columnNo]? = ?( ! columnFlags[columnNo]);
???????? try ? {
????????????rows? = ?dao.getSortedRows(columnNo,?columnFlags[columnNo]);
????????} ? catch ?(SQLException?e)? {
???????????? // ?TODO?Auto-generated?catch?block
????????????e.printStackTrace();
????????}
????}

???? /**/ /* *
?????*?刪除某一列,按照主鍵(第一列)
?????*?@param?key
?????*?@return
????? */
???? public ?boolean?deleteRow( int ?key)? {
???????? try ? {
????????????dao.deleteRow(key);
????????} ? catch ?(SQLException?e)? {
????????????e.printStackTrace();
???????????? return ? false ;
????????}
???????? return ? true ;
????}

???? /**/ /* *
?????*?要新增加一個數據前先計算出Id.
?????*?這個例子只是用來演示用的,如果多人訪問會出現并發問題
?????*?@return
????? */
???? public ? int ?getNextId()? {
???????? try ? {
???????????? return ?dao.getNextId();
????????} ? catch ?(SQLException?e)? {
????????????e.printStackTrace();
???????????? return ? - 1 ;
????????}
????}

???? /**/ /* *
?????*?增加一行
?????*?@param?trb
?????*?@return
????? */
???? public ?boolean?addRow(TableRowBean?trb)? {
???????? try ? {
????????????dao.addRow(trb);
???????????? return ? true ;
????????} ? catch ?(SQLException?e)? {
????????????e.printStackTrace();
???????????? return ? false ;
????????}
????}

???? /**/ /* *
?????*?更改一行
?????*?@param?trb
?????*?@return
????? */
???? public ?boolean?updateRow(TableRowBean?trb)? {
???????? try ? {
????????????dao.updateRow(trb);
???????????? return ? true ;
????????} ? catch ?(SQLException?e)? {
????????????e.printStackTrace();
???????????? return ? false ;
????????}
????}

???? /**/ /* *
?????*?按照key取回單行信息
?????*?@param?key
?????*?@return
????? */
???? public ?TableRowBean?getSingleRow( int ?key)? {
????????TableRowBean?row;
???????? try ? {
????????????row? = ?dao.getSingleRow(key);
????????} ? catch ?(SQLException?e)? {
????????????row? = ? new ?TableRowBean();
????????????e.printStackTrace();
????????}
???????? return ?row;
????}

???? /**/ /* *
?????*?輔助方法計算分頁數
?????*?@param?rowSize
?????*?@param?pageSize
?????*?@return
????? */
???? private ? static ? int ?getTotalPageByRow( int ?rowSize,? int ?pageSize)? {
???????? int ?result? = ? 0 ;
????????result? = ?rowSize? % ?pageSize? == ? 0 ? ? ?rowSize? / ?pageSize?:?rowSize
???????????????? / ?pageSize? + ? 1 ;
???????? return ?result;
????}
}
接下來就是寫配置文件了。主要的配置文件有三個web.xml struts-config.xml dwr.xml
web.xml
<? xml?version="1.0"?encoding="ISO-8859-1" ?>
<! DOCTYPE?web-app?PUBLIC?"-//Sun?Microsystems,?Inc.//DTD?Web?Application?2.3//EN"
?????????????????????????"http://java.sun.com/dtd/web-app_2_3.dtd" >
< web-app >
???? < filter >
???????? < filter-name > EncodingFilter </ filter-name >
???????? < filter-class > org.mstar.strutsajax.EncodingFilter </ filter-class >
???????? < init-param >
???????????????? < param-name > encoding </ param-name >
???????????????? < param-value > gb2312 </ param-value >
???????? </ init-param >
???? </ filter >
???? < servlet >
???????? < servlet-name > action </ servlet-name >
???????? < servlet-class > org.apache.struts.action.ActionServlet </ servlet-class >
???????? < init-param >
???????????? < param-name > config </ param-name >
???????????? < param-value > /WEB-INF/struts-config.xml </ param-value >
???????? </ init-param >
???????? < load-on-startup > 1 </ load-on-startup >
???? </ servlet >
???? < servlet >
???????? < servlet-name > dwr-invoker </ servlet-name >
???????? < display-name > DWR?Servlet </ display-name >
???????? < description > Direct?Web?Remoter?Servlet </ description >
???????? < 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 >
???????? < load-on-startup > 1 </ load-on-startup >
???? </ servlet >
???? < servlet-mapping >
???????? < servlet-name > action </ servlet-name >
???????? < url-pattern > *.do </ url-pattern >
???? </ servlet-mapping >
???? < servlet-mapping >
???????? < servlet-name > dwr-invoker </ servlet-name >
???????? < url-pattern > /dwr/* </ url-pattern >
???? </ servlet-mapping >
???? < welcome-file-list >
???????? < welcome-file > index.jsp </ welcome-file >
???????? < welcome-file > login.jsp </ welcome-file >
???? </ welcome-file-list >
???? < taglib >
???????? < taglib-uri > /WEB-INF/struts-bean </ taglib-uri >
???????? < taglib-location > /WEB-INF/struts-bean.tld </ taglib-location >
???? </ taglib >
???? < taglib >
???????? < taglib-uri > /WEB-INF/struts-logic </ taglib-uri >
???????? < taglib-location > /WEB-INF/struts-logic.tld </ taglib-location >
???? </ taglib >
???? < taglib >
???????? < taglib-uri > /WEB-INF/struts-html </ taglib-uri >
???????? < taglib-location > /WEB-INF/struts-html.tld </ taglib-location >
???? </ taglib >
</ web-app >
其中要注意這段Servlet的聲明
< servlet >
???????? < servlet-name > dwr-invoker </ servlet-name >
???????? < display-name > DWR?Servlet </ display-name >
???????? < description > Direct?Web?Remoter?Servlet </ description >
???????? < 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 >
???????? < load-on-startup > 1 </ load-on-startup >
???? </ servlet >
debug打開的話，你就可以看到每一個遠程調用。對開發很有用。
struts-config我就不寫了，大家對這個比較了解，要看的話，下載我的源碼，在最后面我會寫上。
重點是dwr.xml.這里是你要提供遠程接口信息
<? 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 >
???? < init >
???????? < converter? id ="tablerowbean" ?class ="org.mstar.strutsajax.converter.TableRowConverter" />
?????? </ init >
???? < allow >
???????? < create? creator ="new" ?javascript ="UserLogic" >
???????????? < param? name ="class" ?value ="org.mstar.strutsajax.ajax.UserLogic" />
???????????? < include? method ="validate" />
???????? </ create >
???????? < create? creator ="new" ?javascript ="TableModel" ?scope ="session" >
???????????? < param? name ="class" ?value ="org.mstar.strutsajax.form.TableModelBean" />
???????????? < include? method ="sortBy" />
???????????? < include? method ="getRowsCount" />
???????????? < include? method ="getTotalPage" />
???????????? < include? method ="setCurrentPage" />
???????????? < include? method ="getCurrentPageRows" />
???????????? < include? method ="getCurrentPageSortedByColumnRows" />
???????????? < include? method ="getRowsByPageNo" />
???????????? < include? method ="deleteRow" />
???????????? < include? method ="getNextId" />
???????????? < include? method ="addRow" />
???????????? < include? method ="updateRow" />
???????????? < include? method ="getSingleRow" />
???????? </ create >
???????? < convert? converter ="tablerowbean" ?match ="org.mstar.strutsajax.form.TableRowBean" />
???? </ allow >
</ dwr >
詳細配置你可以看dwr的文檔。
這里要說的就是，convert，對于你自己的類型如TableRowBean必須寫一個Converter來轉化它，我的TableRowConverter其實就是繼承與BeanConverter然后什么事情也沒做。但是我如果自己用BeanConverter就不行，不知道為什么。其他的都比較好理解。
當然我還有一個weblogic.xml,因為我是發布在weblogic上的。
<? xml?version="1.0"?encoding="UTF-8" ?>
<! DOCTYPE?weblogic-web-app?PUBLIC?"-//BEA?Systems,?Inc.//DTD?Web?Application?8.1//EN"????"http://www.bea.com/servers/wls810/dtd/weblogic810-web-jar.dtd" >
< weblogic-web-app >
???? < jsp-descriptor >
???????? < jsp-param >
???????????? < param-name > debug </ param-name >
???????????? < param-value > true </ param-value >
???????? </ jsp-param >
???? </ jsp-descriptor >
???? < context-root > struts-ajax </ context-root >
</ weblogic-web-app >
剩下了就是JSP頁面了。我再寫一篇吧。

dwr簡介--一個例子(續)


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