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: &IQp&
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CountBean.java N}Ol`@@#h
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/* P(_wT:8C?
* CountData.java FN#6pM']|
* x4PH-f-7
* Created on 2007年1月1日, 下午4:44 n\nC.|_G@
* Q9lw~"
* To change this template, choose Tools | Options and locate the template under %f{1u5+5
* the Source Creation and Management node. Right-click the template and choose d2Z kchf
* Open. You can then make changes to the template in the Source Editor. Y4%Bx8
*/ H$^b.5K
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package com.tot.count; ?G5JAG`
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/** xZ51iD$
* [e2sUO0~r
* @author ;CU<\
*/ *0 ;DCUv
public class CountBean { x*H4o{o0
private String countType; -fl?G%:(!0
int countId; FtUO gL)|
/** Creates a new instance of CountData */ &S}i)Nu6J
public CountBean() {}
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public void setCountType(String countTypes){ U&fOsx?"
this.countType=countTypes; U/ncD F%C
} }w \["r
public void setCountId(int countIds){ sOSol7n
this.countId=countIds; x?J-
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} ` Nn^
public String getCountType(){ kIAWI;H{
return countType; Gs*FbrY
} U9D4bn D
public int getCountId(){ {emO=@CP
return countId; r( _9_%[
} Gy9+-7"V
} uiO7sf6
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CountCache.java }]pq&v!
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/* wVvk{tS
* CountCache.java >EFjyhVE
* z6)SaSYE
* Created on 2007年1月1日, 下午5:01 &qki
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* Z!TLWX"
* To change this template, choose Tools | Options and locate the template under Q 'R@'W9
* the Source Creation and Management node. Right-click the template and choose })OgsBk
* Open. You can then make changes to the template in the Source Editor. `}1IQ.3
*/ "5mdq-h(
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package com.tot.count; VGoD2,(b^
import java.util.*; #>-_z
/** .Od.lxz"mp
* n*6 b*fl
* @author k+>-?S,
*/ ]X,C9
public class CountCache { [&n2 yt
public static LinkedList list=new LinkedList(); m~ %\f8w-x
/** Creates a new instance of CountCache */ @O}%sjC1
public CountCache() {} ;z;O}<8s
public static void add(CountBean cb){ i,R<`K0
if(cb!=null){ Kk2PWJ7
list.add(cb); BN&^$1F((
} .jRp.U
} ?[Od.
} $m`?x5rL8
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CountControl.java "d'D:>z]%
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/* D 8^wR{-;J
* CountThread.java G>{Bij44
* WJ$D]7
* Created on 2007年1月1日, 下午4:57 * B!uYP
* {J2*6_
* To change this template, choose Tools | Options and locate the template under j )6A
* the Source Creation and Management node. Right-click the template and choose +E7s[9/r
* Open. You can then make changes to the template in the Source Editor. -QL_a8NL
*/ {D1"bDZ
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package com.tot.count; `_C4L=q"
import tot.db.DBUtils; oLEqy
import java.sql.*; m72r6Yq2@
/** K_
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* Qvh: hkR
* @author 1BK-uv:
*/ ^ZX 71-
public class CountControl{ H:
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private static long lastExecuteTime=0;//上次更新时间 [mKPOg-t
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 1.YDIB||
/** Creates a new instance of CountThread */ VfOm#Ue0q
public CountControl() {} E(Tvj\9
public synchronized void executeUpdate(){ +^n [B
Connection conn=null; ~=~|@K
PreparedStatement ps=null; Sw<@u+Z;%
try{ ftB-gItV
conn = DBUtils.getConnection(); XTpYf
conn.setAutoCommit(false); F@Qzh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); RnV
)*
for(int i=0;i<CountCache.list.size();i++){ VdpwZ
CountBean cb=(CountBean)CountCache.list.getFirst(); (K"U# Zn
CountCache.list.removeFirst(); Z-W>WR
ps.setInt(1, cb.getCountId()); ohqi4Y!j/~
ps.executeUpdate();⑴ '`Eb].s*
//ps.addBatch();⑵ _NQMi4 V(
} MPx%#'Q
//int [] counts = ps.executeBatch();⑶ Dbt"}#uit;
conn.commit(); 9|v3lGK(
}catch(Exception e){ \<WRk4D
e.printStackTrace(); uc]]zI6
} finally{ -ju&"L B
try{ Pu dIb|V2
if(ps!=null) { ,h,DB=!K<
ps.clearParameters(); /1ZRjf^
ps.close(); $s-/![
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ps=null; VWqmqR%
} .}Va~[0j
}catch(SQLException e){} 9~i=Af@
DBUtils.closeConnection(conn); &GF@9BXI3
} zil^^wT0J
} hw/:
public long getLast(){ oUrNz#U
return lastExecuteTime; Vvk1 D(
} F)_zR
public void run(){ {2Jo|z
long now = System.currentTimeMillis(); rnW(<t"
if ((now - lastExecuteTime) > executeSep) { rM/Ona2x
//System.out.print("lastExecuteTime:"+lastExecuteTime); -0rc4<};h
//System.out.print(" now:"+now+"\n"); &5:83#*Oj
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); qScc~i Oq
lastExecuteTime=now; 9<BC6M_/
executeUpdate(); X}*\/(fzl
} c\cPmj@
else{ ;oW#>!HrY
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Fd!Np7xw
} &Z!O
} S-{=4b'
} Lky<L96
//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 jd]Om
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类写好了,下面是在JSP中如下调用。 .|Unq`ll
2wR?ON=Q
<% zf+jQ
CountBean cb=new CountBean(); l*eJa38
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); GH ]c
CountCache.add(cb); G`1!SEae
out.print(CountCache.list.size()+"<br>"); cQM_kV??!
CountControl c=new CountControl(); gEr@L
c.run(); kucH=96
out.print(CountCache.list.size()+"<br>"); })~M}d2LXB
%>