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: ML(
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CountBean.java 0Sgaem`
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/* mxz-4.
* CountData.java )0Me?BRp
* U2ZD]q
* Created on 2007年1月1日, 下午4:44 Lz:(6`S
* ,)iKH]lY=
* To change this template, choose Tools | Options and locate the template under >|twyb
* the Source Creation and Management node. Right-click the template and choose )tl.s)"N
* Open. You can then make changes to the template in the Source Editor. sIK;x]Q)
*/ /Rg*~Ers
*
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package com.tot.count; m"o ;L3
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/** ,B0_MDA +
* 72oF ,42y
* @author Um: Hrjw
*/ 4Rvf
public class CountBean { %7gkNa
private String countType; av$/Om:
int countId; SL;9Q[
/** Creates a new instance of CountData */ yb/%?DNQT
public CountBean() {} 86\S?=J-b
public void setCountType(String countTypes){ 82]vkU
this.countType=countTypes; 1f8GW
} ])Qs {hs~s
public void setCountId(int countIds){ i}o[- S4
this.countId=countIds; :P@rkT3Q t
} \@1=stK:F
public String getCountType(){ 2w-51tqm
return countType; YBP:q2H
} N1}={yF.fQ
public int getCountId(){ =?s3iP
return countId; r?*NhLG;
} l+g9 5mjP
} L0tAgW!@
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CountCache.java _Jt 2YZdA
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/* " $ew~;z
* CountCache.java Eyh51IB.
* ;XDz)`c
* Created on 2007年1月1日, 下午5:01 D.1J_Y=9
* eU N"w,@y
* To change this template, choose Tools | Options and locate the template under 3t0[^cY8=z
* the Source Creation and Management node. Right-click the template and choose zBP>jM(8
* Open. You can then make changes to the template in the Source Editor. "/nNM{^
*/ fuB)qt!E
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package com.tot.count; ph#tgLJ
import java.util.*; Eb=#9f%y>&
/** kee|42E
* D Kw*~0
* @author s9>(Jzcf9
*/ _ %x4ty
public class CountCache { f5GdZ_
public static LinkedList list=new LinkedList(); *\o/q[
/** Creates a new instance of CountCache */ !2|=PB' M
public CountCache() {} |P.6<
public static void add(CountBean cb){ 3tmdi 3s
if(cb!=null){ 2EK%N'H
list.add(cb); @YH+cG|
} ,=
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} 7lo|dg80
} F>X-w+b4r
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CountControl.java : ~ A%#
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/* p<v.Q
* CountThread.java "z*:'8;E
* HSIvWhg?p
* Created on 2007年1月1日, 下午4:57 8V-\e?&^
* RuG-{NF{F
* To change this template, choose Tools | Options and locate the template under cM_Fp
* the Source Creation and Management node. Right-click the template and choose e62Dx#IY
* Open. You can then make changes to the template in the Source Editor. 6st^4S5
*/ 6UE(f@
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package com.tot.count; c:l]=O
import tot.db.DBUtils; oR*=|B
import java.sql.*; ~=Ncp9ej#
/** Q8MS,7y/
* ?/JBt
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* @author t+nRw?Z
*/ b%t+,0s|
public class CountControl{ Y&2aO1
private static long lastExecuteTime=0;//上次更新时间 IOK}+C0e
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 XW L^
/** Creates a new instance of CountThread */ fB+b}aoV
public CountControl() {} ^I]{7$6^
public synchronized void executeUpdate(){ a9~"3y
Connection conn=null; somfv$'B
PreparedStatement ps=null; ;:mY JV
try{ PzY)"]g
conn = DBUtils.getConnection(); eu'1H@vX(
conn.setAutoCommit(false); j|e[s ?d
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); nB5Am^bP
for(int i=0;i<CountCache.list.size();i++){ dZGbC 9
CountBean cb=(CountBean)CountCache.list.getFirst(); jK8'T_Pah
CountCache.list.removeFirst(); Vj;
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ps.setInt(1, cb.getCountId()); *T4<&
ps.executeUpdate();⑴ y7<&vIEC
//ps.addBatch();⑵ \%,&~4
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} fn9#>~vrD
//int [] counts = ps.executeBatch();⑶ "D*Wi7
conn.commit(); Y(GN4@`S
}catch(Exception e){ tiLu75vj
e.printStackTrace(); _eLVBG35z
} finally{ zzvlI66e
try{ |ZU#IQVQfn
if(ps!=null) { ,2 WH/"
ps.clearParameters(); #1$}S=8*f
ps.close(); 6kvV
ps=null; dyQh:u
-
} ~hURs;Sb
}catch(SQLException e){} {TZE/A3D,
DBUtils.closeConnection(conn); xKp0r1}
} n_$yV:MuT!
} =8{*@>CX
public long getLast(){ > zL|8f
return lastExecuteTime; Jm![W8L
} gJ\%>r7h
public void run(){ kqB\xlS7k
long now = System.currentTimeMillis(); ]Sta]}VQ
if ((now - lastExecuteTime) > executeSep) { wL<j:>Ke[3
//System.out.print("lastExecuteTime:"+lastExecuteTime); Um
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//System.out.print(" now:"+now+"\n"); C<he4n.
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ?^3B3qqh9
lastExecuteTime=now; f]}}yBte`
executeUpdate(); J>v$2?w`w
} N^B@3QF
else{ J1-):3A
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ,o&<WMD
} }%{=].)L
} o5#,\Y[ g
} ChIoR:y>
//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 *?Wtj
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类写好了,下面是在JSP中如下调用。 v,\93mNp[
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<% d2ofxfpg+
CountBean cb=new CountBean(); tG 7+7Z=
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); |B1Af
CountCache.add(cb); [i9[Mj
out.print(CountCache.list.size()+"<br>"); ^4hc+sh0D
CountControl c=new CountControl(); ,%= '>A
c.run(); !@yQK<0
out.print(CountCache.list.size()+"<br>"); IuWX*b`v
%>