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: _UVpQ5pN
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CountBean.java u
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/* @V:K]M 5
* CountData.java Wx0i_HFR
* ]0D- g2!|A
* Created on 2007年1月1日, 下午4:44 VgbNZ{qk@
* ^t'mW;C$4
* To change this template, choose Tools | Options and locate the template under eJoM4v
* the Source Creation and Management node. Right-click the template and choose {L;sF=d
* Open. You can then make changes to the template in the Source Editor. ;VLDXvGd
*/ ^/#+0/Bn
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package com.tot.count; Lip#uuuXXN
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/** Bj7*2}
* XH%pV
* @author 0~U0s3
*/ o(ow{S@=4
public class CountBean { s*GZOz
private String countType; \kQ)fk]^
int countId; 4$R!)
/** Creates a new instance of CountData */ [#GBn0BG)
public CountBean() {} |*?N#0s5h
public void setCountType(String countTypes){ W5u5!L/
this.countType=countTypes; Fu.aV876\f
} &6\&McmkX
public void setCountId(int countIds){ `sm Cfh}j6
this.countId=countIds; ]\yB,
} THwM',6
public String getCountType(){ v:SHaUS
return countType; cx:_5GF
} 8fqabR
public int getCountId(){ wKpGJ&
{
return countId; .OJGo<#$f
} 0se%|Z|8
} F/2cQ.u2
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CountCache.java <~mqb=qA$
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/* [j@ek
* CountCache.java A}Iyl
* <lB2Nv-,
* Created on 2007年1月1日, 下午5:01 <qR$ `mLN
* !IOmJpl'
* To change this template, choose Tools | Options and locate the template under :Ak^M~6a5
* the Source Creation and Management node. Right-click the template and choose D#<y
pJR
* Open. You can then make changes to the template in the Source Editor. L9/'zhiZBx
*/ )FwOg;=3M"
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package com.tot.count; '`upSJ;e
import java.util.*; }!^h2)'7
/** W
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* Q%O9DCi
* @author SLuQv?R}9
*/ ?`TJ0("z"
public class CountCache { ),{3LIr
public static LinkedList list=new LinkedList(); |6d:k~p
/** Creates a new instance of CountCache */ 05ZYOs }
public CountCache() {} c+{XP&g8_J
public static void add(CountBean cb){ V.3#O^S
if(cb!=null){ ybJa:
list.add(cb); }|h-=T '
} q"Bd-?9
} 08:K9zr
} yHM29fEZk
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CountControl.java cMi9 Z]
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/* [vtDtwL
* CountThread.java ?bd!JW bg`
* Mxz
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* Created on 2007年1月1日, 下午4:57 ,~;`@
* R@WW@ Of
* To change this template, choose Tools | Options and locate the template under b5g^{bzwu
* the Source Creation and Management node. Right-click the template and choose \nOV2(FAT
* Open. You can then make changes to the template in the Source Editor. r;f\^hVy
*/ HV`u#hZ7C
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package com.tot.count; G%gdI3h1Z
import tot.db.DBUtils; ;\"Nekd|
import java.sql.*; yzpa\[^
/** 3>(~5
* WL%T nux
* @author BCExhp
*/ y%--/;
public class CountControl{ *QW.#y>"j
private static long lastExecuteTime=0;//上次更新时间 dY?l
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A f?&VD4K
/** Creates a new instance of CountThread */ XF{2'x_R
public CountControl() {} LzXIqj'H7T
public synchronized void executeUpdate(){ N0fE*xo
Connection conn=null; ed,+Slg
PreparedStatement ps=null; ,,XHw;{
try{ w;VUP@Wm
conn = DBUtils.getConnection(); m";8 nm
conn.setAutoCommit(false); ~l+~MB
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 0T3r#zQ
for(int i=0;i<CountCache.list.size();i++){ qyyLU@hd
CountBean cb=(CountBean)CountCache.list.getFirst(); ,_,7cor
CountCache.list.removeFirst(); 8Pom^QopK
ps.setInt(1, cb.getCountId()); (`n*d3
ps.executeUpdate();⑴ tSDp>0yZ3
//ps.addBatch();⑵ E3Z>R=s
} -NG9?sI\U
//int [] counts = ps.executeBatch();⑶ =L$RY2S"
conn.commit(); "z.!h(Eq
}catch(Exception e){ y^p%/p%
e.printStackTrace(); @Ng q+uXm
} finally{ [\HAJA,
try{ nkk GJV!
if(ps!=null) { suj}A
ps.clearParameters(); jaThS!>v
ps.close(); t[%=[pJHW
ps=null; QL(}k)dB
} `).;W
}catch(SQLException e){} 0txSF^x
DBUtils.closeConnection(conn); lSId<v?C>
} x^F2Ywp%
} '.&,.E&{$
public long getLast(){ y(#F&^|
return lastExecuteTime; hYCyc-W
} GLl@
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public void run(){ 7f=9(Zj
long now = System.currentTimeMillis(); 8DrKq]&
if ((now - lastExecuteTime) > executeSep) { (aCl*vV1
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9]8M {L
//System.out.print(" now:"+now+"\n"); WY~}sE
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6a`_i
lastExecuteTime=now; kLY9#p=X
executeUpdate(); \t&6$"n(B6
} OaxE3bDT
else{ ( Gxv?\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :kI
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} .uagD[${
} d>4e9M"
} B<'V7#L_
//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 H+2J.&Ch
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类写好了,下面是在JSP中如下调用。 7]9s_13]
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<% 7 -V_)FK2c
CountBean cb=new CountBean(); f4T-=` SO
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [76m gj!K
CountCache.add(cb); f{Y|FjPp=E
out.print(CountCache.list.size()+"<br>"); cl7+DAE
CountControl c=new CountControl(); *t |j+*c}
c.run(); .'AHIR&>
out.print(CountCache.list.size()+"<br>"); "/XS3sv"s
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