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📄 dwr 入門與應用（三） - 林信良（良葛格）的专栏 - csdnblog.htm

📁 主要是我最近两月在公司通过百度学习的内容,有AJAX,DWR,JAVA实现文件的上传和下载.主要目的在与告诉大家一个成功程序员(JAVA)是如何学习的,需要学习什么内容.以及学习的态度.
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  target=_self>良葛格学习笔记</A></LI></UL>
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  <LI class=listitem>DL88250：<A title=点击查看《回复:连csdn.net终於快一些了…》 
  href="http://blog.csdn.net/caterpillar_here/archive/2007/02/08/1505773.aspx#540473">呵呵，是啊。。。。快不少呢！</A>
  <LI class=listitem>yuyebuguijia：<A title=点击查看《回复:连csdn.net终於快一些了…》 
  href="http://blog.csdn.net/caterpillar_here/archive/2007/02/08/1505773.aspx#540258">同感.</A>
  <LI class=listitem>aldreamlau：<A title=点击查看《回复:我只是一个小讲师、小作者。。。》 
  href="http://blog.csdn.net/caterpillar_here/archive/2006/07/23/965773.aspx#532636">不知道良葛格老师你会不会不适应大陆这边的事情，开骂和人身攻击的太多了，会有点压抑。<BR></A>
  <LI class=listitem>wei121363：<A title="点击查看《回复:[影音教學]Java SE 6從安裝到API查詢》" 
  href="http://blog.csdn.net/caterpillar_here/archive/2006/12/19/1449110.aspx#529777">请问林老师,在您的书中p71写到:<BR>public 
  class SpringDemo{<BR>public static void main(String 
  args[])<BR>ApplicationContext context=new 
  ClassPathXmlApplicationContext("beans-config.xml");<BR>context.publ……</A>
  <LI class=listitem>zhanming666：<A title=点击查看《回复:我只是一个小讲师、小作者。。。》 
  href="http://blog.csdn.net/caterpillar_here/archive/2006/07/23/965773.aspx#529087">非常感谢林老师,我认真的看了你的java学习笔记,合到一起只用了不到一天的时间,虽然有一些没完全悟透.但基本的知识点没有问题了.感谢你帮我节约了时间,祝你在2007年再创事业佳绩,多写点这样让人共呜的笔记(书籍).</A></LI></UL></SPAN></SPAN><BR><BR></DIV>
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<DIV class=postText><SPAN class=javascript 
id=text167679>來寫個AJAX版的聊天室吧！先看看直接使用AJAX要如何做到，首先需要一個簡單的聊天室Servlet… <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR>20<BR>21<BR>22<BR>23<BR>24<BR>25<BR>26<BR>27<BR>28<BR>29<BR>30<BR>31<BR>32<BR>33<BR>34<BR>35<BR>36<BR>37<BR>38<BR>39<BR>40<BR>41<BR>42<BR>43<BR>44<BR>45<BR>46<BR>47<BR>48<BR>49<BR>50<BR>51<BR>52<BR>53<BR>54<BR>55<BR></FONT></PRE></TD>
    <TD vAlign=top align=left bgColor=#ffffff><PRE><FONT class=java-reserved_word><STRONG>package</STRONG></FONT> onlyfun.caterpillar;<BR>&nbsp;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.io.IOException;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.io.PrintWriter;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.util.LinkedList;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.util.List;<BR>&nbsp;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> javax.servlet.ServletException;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> javax.servlet.http.HttpServletRequest;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> javax.servlet.http.HttpServletResponse;<BR>&nbsp;<BR> <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> <FONT class=java-reserved_word><STRONG>class</STRONG></FONT> ChatRoomServlet <FONT class=java-reserved_word><STRONG>extends</STRONG></FONT> javax.servlet.http.HttpServlet <FONT class=java-reserved_word><STRONG>implements</STRONG></FONT> javax.servlet.Servlet <FONT class=java-bracket>{</FONT><BR>     <FONT class=java-reserved_word><STRONG>private</STRONG></FONT> <FONT class=java-reserved_word><STRONG>static</STRONG></FONT> LinkedList&lt;Message&gt; messages = <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> LinkedList&lt;Message&gt;();<BR>     <BR>     <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> ChatRoomServlet() <FONT class=java-bracket>{</FONT><BR>    <FONT class=java-reserved_word><STRONG>super</STRONG></FONT>(); <BR>  <FONT class=java-bracket>}</FONT><BR>    <BR>    <FONT class=java-reserved_word><STRONG>private</STRONG></FONT> List&lt;Message&gt; addMessage(String text) <FONT class=java-bracket>{</FONT><BR>        <FONT class=java-reserved_word><STRONG>if</STRONG></FONT> (text != <FONT class=java-reserved_word><STRONG>null</STRONG></FONT> &amp;&amp; text.trim().length() &gt; 0) <FONT class=java-bracket>{</FONT><BR>            messages.addFirst(<FONT class=java-reserved_word><STRONG>new</STRONG></FONT> Message(text));<BR>            <FONT class=java-reserved_word><STRONG>while</STRONG></FONT> (messages.size() &gt; 10) <FONT class=java-bracket>{</FONT><BR>                messages.removeLast();<BR>            <FONT class=java-bracket>}</FONT><BR>        <FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>        <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> messages;<BR>    <FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>    <FONT class=java-reserved_word><STRONG>private</STRONG></FONT> List&lt;Message&gt; getMessages() <FONT class=java-bracket>{</FONT><BR>        <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> messages;<BR>    <FONT class=java-bracket>}</FONT><BR>    <BR>  <FONT class=java-reserved_word><STRONG>protected</STRONG></FONT> <FONT class=java-reserved_word><STRONG>void</STRONG></FONT> doPost(HttpServletRequest request, HttpServletResponse response) <FONT class=java-reserved_word><STRONG>throws</STRONG></FONT> ServletException, IOException <FONT class=java-bracket>{</FONT><BR>        List&lt;Message&gt; list = <FONT class=java-reserved_word><STRONG>null</STRONG></FONT>;<BR>        <BR>        <FONT class=java-reserved_word><STRONG>if</STRONG></FONT>(<FONT class=java-string>"send"</FONT>.equals(request.getParameter(<FONT class=java-string>"task"</FONT>))) <FONT class=java-bracket>{</FONT><BR>             list = addMessage(request.getParameter(<FONT class=java-string>"msg"</FONT>));<BR>        <FONT class=java-bracket>}</FONT><BR>        <FONT class=java-reserved_word><STRONG>else</STRONG></FONT> <FONT class=java-reserved_word><STRONG>if</STRONG></FONT>(<FONT class=java-string>"query"</FONT>.equals(request.getParameter(<FONT class=java-string>"task"</FONT>)))<FONT class=java-bracket>{</FONT><BR>             list = getMessages();<BR>        <FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>        PrintWriter out = response.getWriter();<BR>        response.setContentType(<FONT class=java-string>"text/xml"</FONT>);<BR>        response.setHeader(<FONT class=java-string>"Cache-Control"</FONT>, <FONT class=java-string>"no-cache"</FONT>);<BR>&nbsp;<BR>        out.println(<FONT class=java-string>"&lt;response&gt;"</FONT>);<BR>        <FONT class=java-reserved_word><STRONG>for</STRONG></FONT>(<FONT class=java-reserved_word><STRONG>int</STRONG></FONT> i = 0; i &lt; list.size(); i++) <FONT class=java-bracket>{</FONT><BR>            String msg = list.get(i).getText();<BR>            out.println(<FONT class=java-string>"&lt;message&gt;"</FONT> + msg + <FONT class=java-string>"&lt;/message&gt;"</FONT>);<BR>        <FONT class=java-bracket>}</FONT><BR>        out.println(<FONT class=java-string>"&lt;/response&gt;"</FONT>);<BR>  <FONT class=java-bracket>}</FONT>             <BR><FONT class=java-bracket>}</FONT> </PRE></TD></TR></TBODY></TABLE><BR><BR>Message物件如下… 
<BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR>20<BR>21<BR>22<BR>23<BR></FONT></PRE></TD>
    <TD vAlign=top align=left bgColor=#ffffff><PRE><FONT class=java-reserved_word><STRONG>package</STRONG></FONT> onlyfun.caterpillar;<BR>&nbsp;<BR><FONT class=java-reserved_word><STRONG>public</STRONG></FONT> <FONT class=java-reserved_word><STRONG>class</STRONG></FONT> Message <FONT class=java-bracket>{</FONT><BR>    <FONT class=java-reserved_word><STRONG>private</STRONG></FONT> <FONT class=java-reserved_word><STRONG>long</STRONG></FONT> id = System.currentTimeMillis();<BR>    <FONT class=java-reserved_word><STRONG>private</STRONG></FONT> String text;<BR>    <BR>    <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> Message(String newtext) <FONT class=java-bracket>{</FONT><BR>        text = newtext;<BR>        <FONT class=java-reserved_word><STRONG>if</STRONG></FONT> (text.length() &gt; 256) <FONT class=java-bracket>{</FONT><BR>            text = text.substring(0, 256);<BR>        <FONT class=java-bracket>}</FONT><BR>        text = text.replace(<FONT class=java-string>'&lt;'</FONT>, <FONT class=java-string>'['</FONT>);<BR>        text = text.replace(<FONT class=java-string>'&amp;'</FONT>, <FONT class=java-string>'_'</FONT>);<BR>    <FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>    <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> <FONT class=java-reserved_word><STRONG>long</STRONG></FONT> getId() <FONT class=java-bracket>{</FONT><BR>        <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> id;<BR>    <FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>    <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> String getText() <FONT class=java-bracket>{</FONT><BR>        <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> text;<BR>    <FONT class=java-bracket>}</FONT><BR><FONT class=java-bracket>}</FONT> </PRE></TD></TR></TBODY></TABLE><BR><BR>Servlet接受訊息新增與查詢，判斷的方式是檢查請求參數task是send或query。 
<BR><BR>Servlet會以XML傳回目前List當中的訊息，客戶端可以查詢或插入新訊息時，取得目前List中的訊息，接著在web.xml中設定一下… 
<BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR>20<BR>21<BR>22<BR></FONT></PRE></TD>
    <TD vAlign=top align=left bgColor=#ffffff><PRE>&lt;?xml version=<FONT class=java-string>"1.0"</FONT> encoding=<FONT class=java-string>"UTF-8"</FONT>?&gt;<BR>&lt;web-app id=<FONT class=java-string>"WebApp_ID"</FONT> version=<FONT class=java-string>"2.4"</FONT> xmlns=<FONT class=java-string>"http://java.sun.com/xml/ns/j2ee"</FONT> xmlns:xsi=<FONT class=java-string>"http://www.w3.org/2001/XMLSchema-instance"</FONT> xsi:schemaLocation=<FONT class=java-string>"http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</FONT>&gt;<BR>  &lt;servlet&gt;<BR>    &lt;description&gt;<BR>    &lt;/description&gt;<BR>    &lt;display-name&gt;<BR>    ChatRoomServlet&lt;/display-name&gt;<BR>    &lt;servlet-name&gt;ChatRoomServlet&lt;/servlet-name&gt;<BR>    &lt;servlet-class&gt;<BR>    onlyfun.caterpillar.ChatRoomServlet&lt;/servlet-class&gt;<BR>  &lt;/servlet&gt;<BR>&nbsp;<BR>  &lt;servlet-mapping&gt;<BR>    &lt;servlet-name&gt;ChatRoomServlet&lt;/servlet-name&gt;<BR>    &lt;url-pattern&gt;/ChatRoomServlet&lt;/url-pattern&gt;<BR>  &lt;/servlet-mapping&gt;<BR>  &lt;session-config&gt;<BR>    &lt;session-timeout&gt;<BR>            30<BR>        &lt;/session-timeout&gt;<BR>  &lt;/session-config&gt;  <BR>&lt;/web-app&gt;<BR></PRE></TD></TR></TBODY></TABLE><BR><BR>在網頁中，使用者可以在輸入訊息後按下按鈕送出資訊，並在XML回應取得時，將訊息以一列一列的表格方式顯示出來，另外還設定了週期性的輪詢，即使不輸入新訊息，也可以週期性的取得新的聊天訊息… 
<BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR>20<BR>21<BR>22<BR>23<BR>24<BR>25<BR>26<BR>27<BR>28<BR>29<BR>30<BR>31<BR>32<BR>33<BR>34<BR>35<BR>36<BR>37<BR>38<BR>39<BR>40<BR>41<BR>42<BR>43<BR>44<BR>45<BR>46<BR>47<BR>48<BR>49<BR>50<BR>51<BR>52<BR>53<BR>54<BR>55<BR>56<BR>57<BR>58<BR>59<BR>60<BR>61<BR>62<BR>63<BR>64<BR>65<BR>66<BR>67<BR>68<BR>69<BR>70<BR>71<BR>72<BR>73<BR>74<BR>75<BR>76<BR>77<BR>78<BR>79<BR>80<BR>81<BR>82<BR>83<BR>84<BR>85<BR>86<BR>87<BR>88<BR>89<BR>90<BR>91<BR>92<BR>93<BR>94<BR>95<BR>96<BR>97<BR></FONT></PRE></TD>
    <TD vAlign=top align=left bgColor=#ffffff><PRE>&lt;!DOCTYPE HTML PUBLIC <FONT class=java-string>"-//W3C//DTD HTML 4.01 Transitional//EN"</FONT>&gt;<BR>&lt;html&gt;<BR>&lt;head&gt;<BR>&lt;meta http-equiv=<FONT class=java-string>"Content-Type"</FONT> content=<FONT class=java-string>"text/html; charset=BIG5"</FONT>&gt;<BR>&lt;title&gt;Chat Room&lt;/title&gt;<BR>&nbsp;<BR>&lt;script type=<FONT class=java-string>"text/javascript"</FONT>&gt;<BR>var xmlHttp;<BR>&nbsp;<BR>function createXMLHttpRequest() <FONT class=java-bracket>{</FONT><BR>    <FONT class=java-reserved_word><STRONG>if</STRONG></FONT> (window.ActiveXObject) <FONT class=java-bracket>{</FONT><BR>        xmlHttp = <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> ActiveXObject(<FONT class=java-string>"Microsoft.XMLHTTP"</FONT>);<BR>    <FONT class=java-bracket>}</FONT> <BR>    <FONT class=java-reserved_word><STRONG>else</STRONG></FONT> <FONT class=java-reserved_word><STRONG>if</STRONG></FONT> (window.XMLHttpRequest) <FONT class=java-bracket>{</FONT><BR>        xmlHttp = <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> XMLHttpRequest();<BR>    <FONT class=java-bracket>}</FONT><BR><FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>function sendMessage() <FONT class=java-bracket>{</FONT><BR>  var msg = document.getElementById(<FONT class=java-string>"text"</FONT>).value;<BR>  <BR>  <FONT class=java-reserved_word><STRONG>if</STRONG></FONT>(msg == <FONT class=java-string>""</FONT>) <FONT class=java-bracket>{</FONT><BR>    refreshMessage();<BR>    <FONT class=java-reserved_word><STRONG>return</STRONG></FONT>;<BR>  <FONT class=java-bracket>}</FONT><BR>  <BR>  var param = <FONT class=java-string>"task=send&amp;msg="</FONT> + msg;<BR>  ajaxRequest(param);<BR>  document.getElementById(<FONT class=java-string>"text"</FONT>).value = <FONT class=java-string>""</FONT>;<BR><FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>function queryMessage() <FONT class=java-bracket>{</FONT><BR>  var param = <FONT class=java-string>"task=query"</FONT>;<BR>  ajaxRequest(param);<BR><FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>function ajaxRequest(param) <FONT class=java-bracket>{</FONT><BR>  var url = <FONT class=java-string>"ChatRoomServlet?timestamp"</FONT> + <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> Date().getTime();<BR>    createXMLHttpRequest();<BR>  xmlHttp.onreadystatechange = refreshMessage;<BR>    xmlHttp.open(<FONT class=java-string>"POST"</FONT>, url, <FONT class=java-reserved_word><STRONG>true</STRONG></FONT>);<BR>  xmlHttp.setRequestHeader(<FONT class=java-string>"Content-Type"</FONT>,<BR>           <FONT class=java-string>"application/x-www-form-urlencoded;"</FONT>);<BR>    xmlHttp.send(param);<BR><FONT class=java-bracket>}</FONT><BR>  <BR>function refreshMessage() <FONT class=java-bracket>{</FONT><BR>  <FONT class=java-reserved_word><STRONG>if</STRONG></FONT>(xmlHttp.readyState == 4) <FONT class=java-bracket>{</FONT><BR>        <FONT class=java-reserved_word><STRONG>if</STRONG></FONT>(xmlHttp.status == 200) <FONT class=java-bracket>{</FONT><BR>          var messages = xmlHttp.responseXML.getElementsByTagName(<FONT class=java-string>"message"</FONT>);<BR>  <BR>          var table_body = document.getElementById(<FONT class=java-string>"dynamicUpdateArea"</FONT>);<BR>      var length = table_body.childNodes.length;<BR>      <FONT class=java-reserved_word><STRONG>for</STRONG></FONT> (var i = 0; i &lt; length; i++) <FONT class=java-bracket>{</FONT><BR>        table_body.removeChild(table_body.childNodes[0]);<BR>      <FONT class=java-bracket>}</FONT><BR>      <BR>      var length = messages.length;<BR>          <FONT class=java-reserved_word><STRONG>for</STRONG></FONT>(var i = length - 1; i &gt;= 0 ; i--) <FONT class=java-bracket>{</FONT><BR>              var message = messages[i].firstChild.data;<BR>              var row = createRow(message);<BR>        <BR>              table_body.appendChild(row);                        <BR>          <FONT class=java-bracket>}</FONT><BR>      setTimeout(<FONT class=java-string>"queryMessage()"</FONT>, 2000);<BR>        <FONT class=java-bracket>}</FONT><BR>  <FONT class=java-bracket>}</FONT><BR><FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>function createRow(message) <FONT class=java-bracket>{</FONT><BR>    var row = document.createElement(<FONT class=java-string>"tr"</FONT>);<BR>    var cell = document.createElement(<FONT class=java-string>"td"</FONT>);<BR>    var cell_data = document.createTextNode(message);<BR>    cell.appendChild(cell_data);<BR>    row.appendChild(cell);<BR>    <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> row;<BR><FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>&lt;/script&gt;<BR>&nbsp;<BR>&lt;/head&gt;<BR>&lt;body&gt;<BR>&nbsp;<BR>&lt;p&gt;<BR>  Your Message:<BR>  &lt;input id=<FONT class=java-string>"text"</FONT>/&gt;<BR>  &lt;input type=<FONT class=java-string>"button"</FONT> value=<FONT class=java-string>"Send"</FONT><BR>      onclick=<FONT class=java-string>"sendMessage()"</FONT>/&gt;<BR>&lt;/p&gt;<BR>&nbsp;<BR>&lt;p&gt;Messages:&lt;/p&gt;<BR>    &lt;table align=<FONT class=java-string>"left"</FONT>&gt;<BR>        &lt;tbody id=<FONT class=java-string>"dynamicUpdateArea"</FONT>&gt;&lt;/tbody&gt;<BR>    &lt;/table&gt;<BR>&nbsp;<BR>&lt;/body&gt;<BR>&lt;/html&gt;<BR></PRE></TD></TR></TBODY></TABLE><BR><BR>簡單抓個畫面…&nbsp; 
</SPAN><BR><IMG alt="" 
src="DWR 入門與應用（三） - 林信良（良葛格）的专栏 - CSDNBlog.files/1.jpg"><BR><BR><SPAN 
class=javascript 
id=text167681>直接用AJAX，後端用JSP/Servlet，您要對請求參數做些判斷，看看是新增訊息或查詢，並要自行輸出XML，有的沒的… 
<BR><BR>改成DWR的話，就很簡單了，寫個簡單的Java物件… <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR>20<BR>21<BR>22<BR>23<BR></FONT></PRE></TD>
    <TD vAlign=top align=left bgColor=#ffffff><PRE><FONT class=java-reserved_word><STRONG>package</STRONG></FONT> onlyfun.caterpillar;<BR>&nbsp;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.util.LinkedList;<BR><FONT class=java-reserved_word><STRONG>import</STRONG></FONT> java.util.List;<BR>&nbsp;<BR><FONT class=java-reserved_word><STRONG>public</STRONG></FONT> <FONT class=java-reserved_word><STRONG>class</STRONG></FONT> Chat <FONT class=java-bracket>{</FONT><BR>  <FONT class=java-reserved_word><STRONG>private</STRONG></FONT> <FONT class=java-reserved_word><STRONG>static</STRONG></FONT> LinkedList&lt;Message&gt; messages = <FONT class=java-reserved_word><STRONG>new</STRONG></FONT> LinkedList&lt;Message&gt;();<BR>&nbsp;<BR>  <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> List addMessage(String text) <FONT class=java-bracket>{</FONT><BR>    <FONT class=java-reserved_word><STRONG>if</STRONG></FONT> (text != <FONT class=java-reserved_word><STRONG>null</STRONG></FONT> &amp;&amp; text.trim().length() &gt; 0) <FONT class=java-bracket>{</FONT><BR>      messages.addFirst(<FONT class=java-reserved_word><STRONG>new</STRONG></FONT> Message(text));<BR>      <FONT class=java-reserved_word><STRONG>while</STRONG></FONT> (messages.size() &gt; 10) <FONT class=java-bracket>{</FONT><BR>        messages.removeLast();<BR>      <FONT class=java-bracket>}</FONT><BR>    <FONT class=java-bracket>}</FONT><BR> <BR>    <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> messages;<BR>  <FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>  <FONT class=java-reserved_word><STRONG>public</STRONG></FONT> List getMessages() <FONT class=java-bracket>{</FONT><BR>    <FONT class=java-reserved_word><STRONG>return</STRONG></FONT> messages;<BR>  <FONT class=java-bracket>}</FONT><BR><FONT class=java-bracket>}</FONT> </PRE></TD></TR></TBODY></TABLE><BR><BR>接著…在dwr.xml中開放一下… 
<BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR></FONT></PRE></TD>
    <TD vAlign=top align=left bgColor=#ffffff><PRE>&lt;?xml version=<FONT class=java-string>"1.0"</FONT> encoding=<FONT class=java-string>"UTF-8"</FONT>?&gt;<BR>&lt;!DOCTYPE dwr PUBLIC <FONT class=java-string>"-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"</FONT> <FONT class=java-string>"http://www.getahead.ltd.uk/dwr/dwr10.dtd"</FONT>&gt;<BR> <BR>&lt;dwr&gt;<BR>  &lt;allow&gt;<BR>&nbsp;<BR>    &lt;create creator=<FONT class=java-string>"new"</FONT> javascript=<FONT class=java-string>"Chat"</FONT>&gt;<BR>      &lt;param name=<FONT class=java-string>"class"</FONT> value=<FONT class=java-string>"onlyfun.caterpillar.Chat"</FONT>/&gt;<BR>    &lt;/create&gt;<BR>    <BR>    &lt;convert converter=<FONT class=java-string>"bean"</FONT> match=<FONT class=java-string>"onlyfun.caterpillar.Message"</FONT>/&gt;      <BR>  &lt;/allow&gt;<BR>&lt;/dwr&gt;<BR></PRE></TD></TR></TBODY></TABLE><BR><BR>使用者取得訊息時，是直接傳回List物件，而List中裝的是Message物件，Message物件是自訂物件，conterver設定為 
bean，表示DWR會自動將Message的getter名稱轉換為傳回客戶端的JavaScript物件中的屬性，例如Message中有 
getText()，則在客戶端可以用message.text這樣的方式來存取。 <BR><BR>接著是簡單的客戶端網頁… <BR>
<TABLE class=java cellSpacing=1 cellPadding=3 bgColor=#999999 border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=left width=1 bgColor=#dddddd><PRE><FONT color=#555555>1<BR>2<BR>3<BR>4<BR>5<BR>6<BR>7<BR>8<BR>9<BR>10<BR>11<BR>12<BR>13<BR>14<BR>15<BR>16<BR>17<BR>18<BR>19<BR>20<BR>21<BR>22<BR>23<BR>24<BR>25<BR>26<BR>27<BR>28<BR>29<BR>30<BR>31<BR>32<BR>33<BR>34<BR>35<BR>36<BR>37<BR>38<BR>39<BR>40<BR>41<BR>42<BR>43<BR>44<BR>45<BR>46<BR>47<BR></FONT></PRE></TD>
    <TD vAlign=top align=left bgColor=#ffffff><PRE>&lt;!DOCTYPE HTML PUBLIC <FONT class=java-string>"-//W3C//DTD HTML 4.01 Transitional//EN"</FONT>&gt;<BR>&lt;html&gt;<BR>&lt;head&gt;<BR>&lt;meta http-equiv=<FONT class=java-string>"Content-Type"</FONT> content=<FONT class=java-string>"text/html; charset=BIG5"</FONT>&gt;<BR>&lt;title&gt;Insert title here&lt;/title&gt;<BR>&nbsp;<BR>&lt;script src=<FONT class=java-string>"dwr/interface/Chat.js"</FONT> type=<FONT class=java-string>"text/javascript"</FONT>&gt;&lt;/script&gt;<BR>&lt;script src=<FONT class=java-string>"dwr/engine.js"</FONT> type=<FONT class=java-string>"text/javascript"</FONT>&gt;&lt;/script&gt;<BR>&lt;script src=<FONT class=java-string>"dwr/util.js"</FONT> type=<FONT class=java-string>"text/javascript"</FONT>&gt;&lt;/script&gt;<BR>&nbsp;<BR>&lt;script type=<FONT class=java-string>"text/javascript"</FONT>&gt;<BR>function sendMessage() <FONT class=java-bracket>{</FONT><BR>    var text = DWRUtil.getValue(<FONT class=java-string>"text"</FONT>);<BR>    DWRUtil.setValue(<FONT class=java-string>"text"</FONT>, <FONT class=java-string>""</FONT>);<BR>    Chat.addMessage(text, gotMessages);<BR><FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>function gotMessages(messages) <FONT class=java-bracket>{</FONT><BR>    var chatlog = <FONT class=java-string>""</FONT>;<BR>    <FONT class=java-reserved_word><STRONG>for</STRONG></FONT> (var data in messages) <FONT class=java-bracket>{</FONT><BR>        chatlog = <FONT class=java-string>"&lt;div&gt;"</FONT> + messages[data].text +<BR>            <FONT class=java-string>"&lt;/div&gt;"</FONT> + chatlog;<BR>    <FONT class=java-bracket>}</FONT><BR>    DWRUtil.setValue(<FONT class=java-string>"chatlog"</FONT>, chatlog);<BR>  setTimeout(<FONT class=java-string>"queryMessage()"</FONT>, 2000);<BR><FONT class=java-bracket>}</FONT><BR>&nbsp;<BR>function queryMessage() <FONT class=java-bracket>{</FONT><BR>  Chat.getMessages(gotMessages);<BR><FONT class=java-bracket>}</FONT><BR>&lt;/script&gt;<BR>&nbsp;<BR>&lt;/head&gt;<BR>&lt;body&gt;<BR>&nbsp;<BR>&lt;p&gt;<BR>  Your Message:<BR>  &lt;input id=<FONT class=java-string>"text"</FONT>/&gt;<BR>  &lt;input type=<FONT class=java-string>"button"</FONT> value=<FONT class=java-string>"Send"</FONT><BR>      onclick=<FONT class=java-string>"sendMessage()"</FONT>/&gt;<BR>&lt;/p&gt;<BR>&nbsp;<BR>&lt;p&gt;Messages:&lt;/p&gt;<BR>&lt;div id=<FONT class=java-string>"chatlog"</FONT>&gt;&lt;/div&gt;<BR>&nbsp;<BR>&lt;/body&gt;<BR>&lt;/html&gt;<BR></PRE></TD></TR></TBODY></TABLE><BR><BR>當List物件傳回時，它成為gotMessages(messages)中的messages物件，而messages物件中包括 
Message物件轉換後對應的JavaScript物件，由於我們已經設定了Converter，所以可以用messages[data].text來 
取得傳回的訊息… <BR><BR>簡單抓個畫面… </SPAN><BR><IMG alt="" 
src="DWR 入門與應用（三） - 林信良（良葛格）的专栏 - CSDNBlog.files/2.jpg"><BR><BR>
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<H3></H3>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#499660">#</A>&nbsp;<A 
name=499660>&nbsp;</A>cyh&nbsp;发表于2006-10-01 21:54:00&nbsp;&nbsp;IP: 
221.221.242.*</DIV>
<DIV class=postText>支持，希望林老师继续写下去。期待！！！！！</DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#499783">#</A>&nbsp;<A 
name=499783>&nbsp;</A>Ming&nbsp;发表于2006-10-02 08:42:00&nbsp;&nbsp;IP: 
218.16.196.*</DIV>
<DIV class=postText>这篇文章比前两篇难度高了不少，值得学习，谢谢老师!</DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#499961">#</A>&nbsp;<A 
name=499961>&nbsp;</A>邱方纯&nbsp;发表于2006-10-03 19:08:00&nbsp;&nbsp;IP: 
221.12.59.*</DIV>
<DIV class=postText>这篇文章写的好，比前面的难度提高了很多，在实际应用中也很不错， <BR>老师，继续阿 <BR><BR>我们期盼着呢 
<BR><BR></DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#500128">#</A>&nbsp;<A 
name=500128>&nbsp;</A><A href="http://blog.163.com./junhuang" target=_blank 
rel=nofollow>JUN HUANG</A>&nbsp;发表于2006-10-04 19:33:00&nbsp;&nbsp;IP: 
218.79.200.*</DIV>
<DIV class=postText>我还是个菜鸟,看了深有感触.受益非浅.</DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#500137">#</A>&nbsp;<A 
name=500137>&nbsp;</A>小蛇&nbsp;发表于2006-10-05 00:14:00&nbsp;&nbsp;IP: 
125.93.25.*</DIV>
<DIV class=postText>教程也清晰 希望老师能出个DWR相关的书带领带领我们`` <BR><BR>我第一个支持</DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#500933">#</A>&nbsp;<A 
name=500933>&nbsp;</A>angin&nbsp;发表于2006-10-08 20:43:00&nbsp;&nbsp;IP: 
58.50.129.*</DIV>
<DIV class=postText>林老师 <BR>什么时候出关于dwr的书啊？ <BR>早点最好！ <BR>最好出一本spring Hibernate 
dwr的书 <BR>准备去买你的jdk5.0学习笔记</DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#501633">#</A>&nbsp;<A 
name=501633>&nbsp;</A>哎，&nbsp;发表于2006-10-11 09:34:00&nbsp;&nbsp;IP: 
59.61.87.*</DIV>
<DIV class=postText>servlet里面有构造函数，但愿林老师是一时手误.</DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#506444">#</A>&nbsp;<A 
name=506444>&nbsp;</A>学到了&nbsp;发表于2006-10-26 10:36:00&nbsp;&nbsp;IP: 
202.134.114.*</DIV>
<DIV 
class=postText>很好,学到东西了,期待林老师继续下去,dwr.xml里还有很多配置,需要您的例程来指导我们去理解!</DIV></DIV><BR>
<DIV class=post>
<DIV class=postTitle><A title="permalink: 回复：DWR 入門與應用（三）" 
href="http://blog.csdn.net/caterpillar_here/archive/2006/09/30/1311605.aspx#511177
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