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JSP高访问量下的计数程序

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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: .s, hl(w,  
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  CountBean.java B23R9.FK  
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/* oOJN?97!k  
* CountData.java 9~u1fk{  
* ~":?})  
* Created on 2007年1月1日, 下午4:44 rF 7EO%,  
* 4$vya+mAk5  
* To change this template, choose Tools | Options and locate the template under x{&Z|D_CM  
* the Source Creation and Management node. Right-click the template and choose -bKli<C  
* Open. You can then make changes to the template in the Source Editor. HM--`RJ  
*/ RCgs3JIE+2  
mDj:w#q  
  package com.tot.count; [Ma&=2h  
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/** b/ur!2yr  
* |4 wVWJ7   
* @author UyIjM;X  
*/ 3!ulBiMh  
public class CountBean { KWhw@y-5j@  
 private String countType; ~M43#E[oOF  
 int countId; ks'25tv}F  
 /** Creates a new instance of CountData */ :9K5zD  
 public CountBean() {} kqv>rA3  
 public void setCountType(String countTypes){ f@>27&'WV  
  this.countType=countTypes; .$S`J2Y  
 } b6oPnP_3P  
 public void setCountId(int countIds){ ~vaV=})  
  this.countId=countIds; DA[-( s  
 } J&Le*R'  
 public String getCountType(){ 3P'.)=}  
  return countType; lty`7(\  
 } <[[DS%(M^  
 public int getCountId(){ &~^"yo#b  
  return countId; bg[q8IBCd  
 } R}Z"Y xx  
} b^^Cj(  
~])\xC  
  CountCache.java pD.7ib^  
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/* _<kE32Bb  
* CountCache.java !^G+@~U  
* H9nZ%n  
* Created on 2007年1月1日, 下午5:01 9 `J`(  
* s`GSc)AI  
* To change this template, choose Tools | Options and locate the template under n5oB#>tI0  
* the Source Creation and Management node. Right-click the template and choose 4d9i AN  
* Open. You can then make changes to the template in the Source Editor. `%F.]|Y0  
*/ Qe]@`Vg  
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package com.tot.count; ]?mWnEi!z  
import java.util.*; QoI@/ jLj  
/** :NS;y-{^^y  
* MdZ7Yep  
* @author mNm 8I8  
*/ 56&s'  
public class CountCache { N;RZIg(x  
 public static LinkedList list=new LinkedList(); T" 8>6a@}E  
 /** Creates a new instance of CountCache */ XQ,I Ej|  
 public CountCache() {} =F8uuYX%m  
 public static void add(CountBean cb){ 'Ys"yY@  
  if(cb!=null){ b"x;i\Z0%  
   list.add(cb); "t`r_Aw  
  } "uqa~R{  
 } u.8vXc  
} )d0&iE`@  
k/!Vv#8  
 CountControl.java M ~.w:~Jm  
c3i|q@ k  
 /* e +4p__TmZ  
 * CountThread.java ^/mQo`[G  
 * LQNu]2  
 * Created on 2007年1月1日, 下午4:57 m7^a4  
 * g|e^}voRM  
 * To change this template, choose Tools | Options and locate the template under `=b*g24z[N  
 * the Source Creation and Management node. Right-click the template and choose ks sXi6^  
 * Open. You can then make changes to the template in the Source Editor. U-X  
 */ Wky~hm  
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package com.tot.count; #=Q/<r.~G  
import tot.db.DBUtils;  QH9(l  
import java.sql.*; 2P@>H_JFF  
/** FhAuTZk  
* c*MjBAq  
* @author FbW kT4t|  
*/ |PDuvv!.f  
public class CountControl{ hFj.d]S  
 private static long lastExecuteTime=0;//上次更新时间  j$&k;S  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 VH+^G)^)W  
 /** Creates a new instance of CountThread */ *Rr,ii  
 public CountControl() {} noh3mi  
 public synchronized void executeUpdate(){ tNmH*"wR<  
  Connection conn=null; B;hc|v{(  
  PreparedStatement ps=null; 0%`\ 8  
  try{ f9&D0x?  
   conn = DBUtils.getConnection(); Mwp#.du(  
   conn.setAutoCommit(false); xgsD<3  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); bq<QUw=]q&  
   for(int i=0;i<CountCache.list.size();i++){ "p2 $R*ie  
    CountBean cb=(CountBean)CountCache.list.getFirst(); v#YO3nD  
    CountCache.list.removeFirst(); 1}KNzMHk9  
    ps.setInt(1, cb.getCountId()); (3c,;koRR  
    ps.executeUpdate();⑴ 52wq<[#tK  
    //ps.addBatch();⑵ dSk\J[D  
   } r"Pj ,}$A  
   //int [] counts = ps.executeBatch();⑶ %49@  
   conn.commit(); _6^vxlF  
  }catch(Exception e){ qJ#?=ITE  
   e.printStackTrace(); c<DsCzX  
  } finally{ X\X  
  try{ \qV5mD]"M  
   if(ps!=null) { >xJt&jW-  
    ps.clearParameters(); {B?%r[nW  
ps.close(); 0 6 K8|K  
ps=null; 4#;rv$ {  
  } </:f-J%U/  
 }catch(SQLException e){} RyIr_:&-~  
 DBUtils.closeConnection(conn); h_* =_2|}  
 } V|#B=W  
} Qaq{UW  
public long getLast(){ ;=*b:y Y  
 return lastExecuteTime; ) 8st  
} zd>[uIOR  
public void run(){ ] A9Vh  
 long now = System.currentTimeMillis(); h7[VXE  
 if ((now - lastExecuteTime) > executeSep) { :v1'(A1t  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); +=$]fjE?  
  //System.out.print(" now:"+now+"\n"); V:QfI  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); kh^AH6{2  
  lastExecuteTime=now; qSkt }F%'  
  executeUpdate(); OA4NXl'  
 } RvYew!n  
 else{ 0wAZ9AxA{  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ruB&&C6)v  
 } sZ]O&Za~  
} (U/6~r'.L  
} )&se/x+  
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 c^A3|tCi  
iWGgt]RJ  
  类写好了,下面是在JSP中如下调用。 4kxy7] W  
ogip#$A}3  
<% o=q N+-N  
CountBean cb=new CountBean(); {~b]6}O  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); IC92lPM }  
CountCache.add(cb); _Dwn@{[(8  
out.print(CountCache.list.size()+"<br>"); _+z@Qn?#6h  
CountControl c=new CountControl(); $J=9$.4"  
c.run(); = fuF]yL%  
out.print(CountCache.list.size()+"<br>"); <*2.B~  
%>
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