社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 7686阅读
  • 0回复

JSP高访问量下的计数程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
有时要为每一篇文章统计其点击次数,如果每一次浏览都要更新一次库的话,那性能在访问量很大的情况下,服务器的压力就会很大了,比较好一点的方法就是先将要更新的数据缓存起来,然后每隔一段时间再利用数据库的批量处理,批量更新库。源码如下: ?.|qRzWL  
@s2z/ h0H  
  CountBean.java `iv,aQ '  
GUmOK=D >  
/* M^mS#<!y  
* CountData.java oQ8W0`bZa  
* @luv;X^%  
* Created on 2007年1月1日, 下午4:44 3 _:yHwkD  
* j?/T7a^  
* To change this template, choose Tools | Options and locate the template under W)<us?5Ec5  
* the Source Creation and Management node. Right-click the template and choose $4>K2  
* Open. You can then make changes to the template in the Source Editor. L2P~moVIi  
*/ ED[PP2[/  
pb$U~TvzhM  
  package com.tot.count; -78 t0-lM  
`P)atQ  
/** B Gh%3"q  
* _(<[!c!@0  
* @author xlqRW"  
*/ u` `FD  
public class CountBean { "^zxq5u  
 private String countType; Z)|*mJ  
 int countId; P et0yH  
 /** Creates a new instance of CountData */ _4owxYSDke  
 public CountBean() {} <2diO=  
 public void setCountType(String countTypes){ }c| Xr^  
  this.countType=countTypes; w80g) 4V+  
 } 0>Z/3i&?<  
 public void setCountId(int countIds){ )]n:y M  
  this.countId=countIds; h/V0}|b  
 } ~ ${. sD\  
 public String getCountType(){ d#vq+wR  
  return countType; P`Anf_  
 } f`RcfYt  
 public int getCountId(){ Uj0DX >I  
  return countId; 9FX'Uws  
 } @wYuc{%S  
} P[8`]=  
_Wk!d3bsx  
  CountCache.java #`<|W5  
;l &mA1+  
/* OY51~#BF  
* CountCache.java 'd|_i6:y&  
* jv5p_v4%O  
* Created on 2007年1月1日, 下午5:01 u(\b1h n  
* +<Uc42i7n  
* To change this template, choose Tools | Options and locate the template under . ?[2,4F;  
* the Source Creation and Management node. Right-click the template and choose ^B1Q";# B^  
* Open. You can then make changes to the template in the Source Editor. +*DXzVC  
*/ .B"h6WMz  
]. IUQ*4t  
package com.tot.count; + 3aAL&  
import java.util.*; mUm9[X~'  
/** @;G}bYq^(I  
* (4>k+ H  
* @author j Bl I^  
*/ +g/y)]AP  
public class CountCache { |B;:Ald  
 public static LinkedList list=new LinkedList(); <S6|$7{1  
 /** Creates a new instance of CountCache */ (YGJw?]  
 public CountCache() {} |TkMrj0  
 public static void add(CountBean cb){ S)n ~^q  
  if(cb!=null){ My5h;N@C  
   list.add(cb); BQ)zm  
  } pI( OI>~3  
 } )4D |sN  
} AHIk7[w  
yw{GO([ZQ  
 CountControl.java hJkIFyQ{j  
I yL2{5  
 /* ^ bexXYh  
 * CountThread.java W.HM!HQp  
 * ,+oQ 5c(f  
 * Created on 2007年1月1日, 下午4:57 Hb#8?{  
 * Mf<P ms\F  
 * To change this template, choose Tools | Options and locate the template under |jU/R  
 * the Source Creation and Management node. Right-click the template and choose egYJ.ZzF0  
 * Open. You can then make changes to the template in the Source Editor. b=wc-n A  
 */ rMH\;\ I|U  
GW]Ygf1t  
package com.tot.count; K`M8[ %S  
import tot.db.DBUtils; @@# ^G8+l  
import java.sql.*; va:5pvt2&  
/** KaauX m  
* >TeTa l  
* @author V[(zRGa{  
*/ (caxl^=  
public class CountControl{ 6*lTur9ni  
 private static long lastExecuteTime=0;//上次更新时间  lN<vu#  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 TXv3@/>ZlG  
 /** Creates a new instance of CountThread */ E"b+Q  
 public CountControl() {} 0%<Fc9#  
 public synchronized void executeUpdate(){ ^}a..@|%W  
  Connection conn=null; ^I5k+cL  
  PreparedStatement ps=null; ol^OvG:TQ  
  try{ q$yTG!q*  
   conn = DBUtils.getConnection(); qdx(wGG  
   conn.setAutoCommit(false); w +fsw@dK&  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 4@u*#Bp`|  
   for(int i=0;i<CountCache.list.size();i++){ Ty}'A(U  
    CountBean cb=(CountBean)CountCache.list.getFirst(); %|I~8>m  
    CountCache.list.removeFirst(); N8@Fj!Zi  
    ps.setInt(1, cb.getCountId()); ==RYf*d  
    ps.executeUpdate();⑴ ~dkS-6q~Q  
    //ps.addBatch();⑵ Z]@my,+Z;  
   } ey_3ah3x  
   //int [] counts = ps.executeBatch();⑶ ,ZHIXylZ  
   conn.commit(); 7YV}F9h4  
  }catch(Exception e){ dAh&Z:86\  
   e.printStackTrace(); eBFsKOtu  
  } finally{ J2f}{!b+I  
  try{ sy.FMy+  
   if(ps!=null) { etMQy6E\  
    ps.clearParameters(); 'P0:1">  
ps.close(); `WboM\u  
ps=null; Rp^k D ,*  
  } 1aP3oXLL  
 }catch(SQLException e){} g=0`^APql  
 DBUtils.closeConnection(conn); AU -,  
 } A_tdtN<  
} >=G;rs  
public long getLast(){ tda#9i[pkH  
 return lastExecuteTime; -,)&?S  
} `aD~\O  
public void run(){ mXtsP1  
 long now = System.currentTimeMillis(); l ~b# Y&  
 if ((now - lastExecuteTime) > executeSep) { ?NOc]'<(G  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); -|bnvPmE  
  //System.out.print(" now:"+now+"\n"); M4w,J2_8MK  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); F{WV}o=MY  
  lastExecuteTime=now; <wfPbzs-V  
  executeUpdate();  l+HmG< P  
 } +DmfqKKbd  
 else{ 6!sC  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 5Tag-+  
 } 0ft81RK  
} ]$oo1ssZ1  
} Ngi] I#V z  
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 oJ734v[X  
Xia4I* *  
  类写好了,下面是在JSP中如下调用。 R.@I}>  
D_]4]&QYT  
<% @{P<!x <Q  
CountBean cb=new CountBean(); eS-akx^@  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Rsd~t_a1  
CountCache.add(cb); NOM6},rp  
out.print(CountCache.list.size()+"<br>"); s;e%*4  
CountControl c=new CountControl(); (yA`h@@WS  
c.run(); U2<8U  
out.print(CountCache.list.size()+"<br>"); 4zKmoYt  
%>
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
10+5=?,请输入中文答案:十五