00000002.htm

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<TITLE>BBS水木清华站∶精华区</TITLE></HEAD><BODY><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER>发信人:&nbsp;dong&nbsp;(春天来了...),&nbsp;信区:&nbsp;Java&nbsp;<BR>标&nbsp;&nbsp;题:&nbsp;访问计数器---使用JAVA&nbsp;Applet和CGI&nbsp;<BR>发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Fri&nbsp;Apr&nbsp;11&nbsp;13:58:40&nbsp;1997)&nbsp;<BR>&nbsp;<BR>这里有个JAVA和CGI程序结合的访问计数器的例子.&nbsp;<BR>其实单纯做访问计数器，只有CGI就够了.&nbsp;<BR>但希望统计用户访问该主页的时间时,只用CGI好象就不行了.&nbsp;(本例没有这个功能.&nbsp;:PPP)&nbsp;<BR>&nbsp;<BR>count.pl&nbsp;<BR>--------------------------------------------------------------&nbsp;<BR>#!/usr/local/bin/perl&nbsp;<BR>#&nbsp;Increments&nbsp;a&nbsp;visit&nbsp;count&nbsp;stored&nbsp;in&nbsp;the&nbsp;file&nbsp;named&nbsp;<BR>#&nbsp;&quot;counter&quot;&nbsp;and&nbsp;send&nbsp;the&nbsp;count&nbsp;as&nbsp;a&nbsp;plain&nbsp;text&nbsp;document.&nbsp;<BR>&nbsp;<BR>#&nbsp;Print&nbsp;a&nbsp;minimal&nbsp;MIME&nbsp;header&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;print&nbsp;&quot;Content-type:&nbsp;text/plain\n\n&quot;;&nbsp;<BR>&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;$counterfile&nbsp;=&nbsp;&quot;counter&quot;;&nbsp;<BR>&nbsp;<BR>#&nbsp;Open&nbsp;the&nbsp;counter&nbsp;file&nbsp;and&nbsp;get&nbsp;current&nbsp;count&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;open(COUNTER,&nbsp;&quot;$counterfile&quot;);&nbsp;<BR>&nbsp;<BR>#&nbsp;Lock&nbsp;the&nbsp;file&nbsp;to&nbsp;guard&nbsp;against&nbsp;another&nbsp;process&nbsp;updating&nbsp;the&nbsp;<BR>#&nbsp;file&nbsp;as&nbsp;this&nbsp;script&nbsp;uses&nbsp;it&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;$lock_exclusive&nbsp;=&nbsp;2;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;$unlock&nbsp;=&nbsp;8;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;flock(COUNTER,&nbsp;$lock_exclusive);&nbsp;<BR>&nbsp;<BR>#&nbsp;Read&nbsp;and&nbsp;increment&nbsp;the&nbsp;count&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;$line&nbsp;=&nbsp;&lt;COUNTER&gt;;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;close(COUNTER);&nbsp;<BR>&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;chop($line);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;$count&nbsp;=&nbsp;$line;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;$count++;&nbsp;<BR>&nbsp;<BR>#&nbsp;Save&nbsp;the&nbsp;new&nbsp;count&nbsp;in&nbsp;the&nbsp;file&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;open(COUNTER,&nbsp;&quot;&gt;$counterfile&quot;);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;print&nbsp;COUNTER&nbsp;(&quot;$count\n&quot;);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;close(COUNTER);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>#&nbsp;Remember&nbsp;to&nbsp;unlock&nbsp;the&nbsp;file&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;flock(COUNTER,&nbsp;$unlock);&nbsp;<BR>&nbsp;<BR>#&nbsp;Send&nbsp;count&nbsp;to&nbsp;caller&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;print&nbsp;&quot;$count\n&quot;;&nbsp;&nbsp;&nbsp;&nbsp;<BR>------------------------------------------------------------&nbsp;<BR>VisitCount.java&nbsp;<BR>&nbsp;<BR>----------------------------------------------------------&nbsp;<BR>//---------------------------------------------------------------&nbsp;<BR>//&nbsp;File:&nbsp;VisitCount.java&nbsp;<BR>//&nbsp;Accesses&nbsp;a&nbsp;CGI&nbsp;program&nbsp;to&nbsp;update&nbsp;visit&nbsp;count&nbsp;and&nbsp;display&nbsp;<BR>//&nbsp;the&nbsp;current&nbsp;count.&nbsp;<BR>//&nbsp;Compile&nbsp;with:&nbsp;javac&nbsp;VisitCount.java&nbsp;<BR>/*&nbsp;<BR>&nbsp;*&nbsp;The&nbsp;VisitCount&nbsp;class&nbsp;is&nbsp;a&nbsp;Java&nbsp;applet&nbsp;that&nbsp;accesses&nbsp;a&nbsp;CGI&nbsp;&nbsp;<BR>&nbsp;*&nbsp;program&nbsp;at&nbsp;the&nbsp;host&nbsp;URL&nbsp;and&nbsp;retrieves&nbsp;the&nbsp;visitor&nbsp;count&nbsp;(the&nbsp;&nbsp;<BR>&nbsp;*&nbsp;CGI&nbsp;program&nbsp;also&nbsp;updates&nbsp;the&nbsp;count).&nbsp;Then&nbsp;it&nbsp;displays&nbsp;the&nbsp;&nbsp;<BR>&nbsp;*&nbsp;current&nbsp;count.&nbsp;Use&nbsp;an&nbsp;&lt;applet&gt;&nbsp;tag&nbsp;to&nbsp;embed&nbsp;this&nbsp;applet&nbsp;<BR>&nbsp;*&nbsp;at&nbsp;the&nbsp;location&nbsp;where&nbsp;you&nbsp;want&nbsp;to&nbsp;display&nbsp;the&nbsp;count.&nbsp;<BR>*/&nbsp;<BR>//---------------------------------------------------------------&nbsp;<BR>import&nbsp;java.awt.*;&nbsp;<BR>import&nbsp;java.applet.*;&nbsp;<BR>import&nbsp;java.net.*;&nbsp;<BR>import&nbsp;java.io.*;&nbsp;<BR>public&nbsp;class&nbsp;VisitCount&nbsp;extends&nbsp;java.applet.Applet&nbsp;<BR>{&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;String&nbsp;visitCount;&nbsp;&nbsp;//&nbsp;String&nbsp;to&nbsp;store&nbsp;visitor&nbsp;count&nbsp;&nbsp;<BR>//&nbsp;Class&nbsp;initialization&nbsp;method&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;void&nbsp;init()&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;<BR>//&nbsp;Open&nbsp;the&nbsp;URL&nbsp;that&nbsp;counts&nbsp;visitors&nbsp;to&nbsp;this&nbsp;site&nbsp;<BR>//&nbsp;***&nbsp;Edit&nbsp;URL&nbsp;before&nbsp;using&nbsp;at&nbsp;your&nbsp;site&nbsp;***&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URL&nbsp;url&nbsp;=&nbsp;new&nbsp;URL(&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;<A HREF="http://www.lnbsoft.com/exec-bin/count.pl?update=1");">http://www.lnbsoft.com/exec-bin/count.pl?update=1");</A>&nbsp;<BR>&nbsp;<BR>//&nbsp;Open&nbsp;a&nbsp;data&nbsp;stream&nbsp;and&nbsp;read&nbsp;a&nbsp;single&nbsp;line&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DataInputStream&nbsp;in&nbsp;=&nbsp;new&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DataInputStream(url.openStream());&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;visitCount&nbsp;=&nbsp;in.readLine();&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;catch(IOException&nbsp;e)&nbsp;{}&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;catch(MalformedURLException&nbsp;e)&nbsp;{}&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;<BR>//&nbsp;Method&nbsp;that&nbsp;paints&nbsp;the&nbsp;output&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;void&nbsp;paint(java.awt.Graphics&nbsp;gc)&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;<BR>//&nbsp;Display&nbsp;the&nbsp;visitor&nbsp;count&nbsp;that&nbsp;was&nbsp;read&nbsp;from&nbsp;the&nbsp;URL&nbsp;<BR>//&nbsp;Use&nbsp;whatever&nbsp;font&nbsp;style&nbsp;and&nbsp;color&nbsp;you&nbsp;want&nbsp;<BR>//&nbsp;I&nbsp;used&nbsp;Helvetica&nbsp;for&nbsp;a&nbsp;message&nbsp;and&nbsp;a&nbsp;Courier&nbsp;font&nbsp;<BR>//&nbsp;for&nbsp;the&nbsp;visitor&nbsp;count&nbsp;<BR>&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Font&nbsp;helv&nbsp;=&nbsp;new&nbsp;Font(&quot;Helvetica&quot;,&nbsp;Font.BOLD,&nbsp;16);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Font&nbsp;courier&nbsp;=&nbsp;new&nbsp;Font(&quot;Courier&quot;,&nbsp;Font.BOLD,&nbsp;24);&nbsp;<BR>&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gc.setFont(helv);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FontMetrics&nbsp;fm&nbsp;=&nbsp;gc.getFontMetrics();&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String&nbsp;message&nbsp;=&nbsp;&quot;Visitor&nbsp;number:&nbsp;&quot;;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;xstart&nbsp;=&nbsp;0;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;ystart&nbsp;=&nbsp;fm.getHeight();&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gc.drawString(message,&nbsp;xstart,&nbsp;ystart);&nbsp;<BR>&nbsp;<BR>//&nbsp;Advance&nbsp;horizontally&nbsp;by&nbsp;amount&nbsp;needed&nbsp;to&nbsp;display&nbsp;message&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;xstart&nbsp;+=&nbsp;fm.stringWidth(message);&nbsp;<BR>&nbsp;<BR>//&nbsp;Change&nbsp;font&nbsp;to&nbsp;Courier&nbsp;and&nbsp;display&nbsp;the&nbsp;count&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gc.setFont(courier);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gc.setColor(Color.red);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gc.drawString(visitCount,&nbsp;xstart,&nbsp;ystart);&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;<BR>}&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>-----------------------------------------------------------------&nbsp;<BR>&nbsp;<BR>HTML文件中调用方法.&nbsp;<BR>&lt;applet&nbsp;code=VisitCount&nbsp;width=200&nbsp;height=26&nbsp;align=middle&gt;&lt;/applet&gt;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>--&nbsp;<BR>高山有崖，林木有枝，忧来无方，人莫之知。&nbsp;<BR>&nbsp;<BR>※&nbsp;来源:·BBS&nbsp;水木清华站&nbsp;bbs.net.tsinghua.edu.cn·[FROM:&nbsp;dbsun20.cs.tsin]&nbsp;<BR><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER></BODY></HTML>

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