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: YO0x68
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CountBean.java 8]\h^k4f
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/* oZ:F3 GQ4Q
* CountData.java ueBoSZRWX
* 4>C=:w
* Created on 2007年1月1日, 下午4:44 E}/|Lja
* b'5pQ2Mq
* To change this template, choose Tools | Options and locate the template under {VG[m@
* the Source Creation and Management node. Right-click the template and choose 6CRPdLTDf
* Open. You can then make changes to the template in the Source Editor. <h51KPo^P
*/ 9[E$>o"%
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package com.tot.count; \Pmk`^T
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/** !!%nl_I(
* m(:qZW
* @author Ec*7n6~9
*/ {; cB?II
public class CountBean { WC*:\:mh
private String countType; e*6` dz@
int countId; G%jJ>T4
/** Creates a new instance of CountData */ Q8cPKDB
public CountBean() {} wg_CI,Kq
public void setCountType(String countTypes){ t>@3RBEK
this.countType=countTypes; E*CQG;^=N
} !BuJC$
public void setCountId(int countIds){ TcmZ0L^O
this.countId=countIds; Bl\kU8O-
} Atq2pL"
public String getCountType(){ *js$r+4
return countType; b\m(0/x
} N:jiZ)
public int getCountId(){ n12c075
return countId; jI<WzvhYG
} |0R%!v(,
} .x?zky^
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CountCache.java "d>g)rvOc
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/* [HiTR !o*
* CountCache.java Mqf}Aiqk;
* SH$cn,3F8
* Created on 2007年1月1日, 下午5:01 `oRs-,d|<
* 8yz((?LrDh
* To change this template, choose Tools | Options and locate the template under &|"I0|tJ
* the Source Creation and Management node. Right-click the template and choose '!h0![OH
* Open. You can then make changes to the template in the Source Editor. h]DECd{
*/ xYVjUb(,X
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package com.tot.count; ::R00gd
import java.util.*; [pFu
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/** xp8f
* seU^IC<
* @author 'Qq_Xn8
*/ =,8Eo"~\
public class CountCache { b<V./rWIB
public static LinkedList list=new LinkedList(); nEcd+7(
/** Creates a new instance of CountCache */ @&xaaqQ-
public CountCache() {} L0|hc
public static void add(CountBean cb){ c1A G3Nb
if(cb!=null){ o``>sBZOq
list.add(cb); /A))"D
} rjQhU%zv
} +ls*//R
} :tqm2t
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CountControl.java \j})Kul
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/* c^bk:=uj
* CountThread.java H?(SSL
* KPd C9H
* Created on 2007年1月1日, 下午4:57 "zIq)PY
* KW7?: x
* To change this template, choose Tools | Options and locate the template under ZMMo6;
* the Source Creation and Management node. Right-click the template and choose .A!0.M|
* Open. You can then make changes to the template in the Source Editor. ZWhmO=b!
*/ tvH\iS #V
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package com.tot.count; ie~fQ!rf
import tot.db.DBUtils; h k!,
import java.sql.*; [H:GKhPC`
/** sqpOS!]
* hB}h-i(u
* @author R~5*#r@f
*/ ]F*a PV
public class CountControl{ CndgfOF
private static long lastExecuteTime=0;//上次更新时间 /`O]etr`d
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 m":SE? {{&
/** Creates a new instance of CountThread */ -S%q!%}u
public CountControl() {} oTD-+MZn
public synchronized void executeUpdate(){ SM /ykk
Connection conn=null; pz35trW
PreparedStatement ps=null; LQ(5D_yG.
try{ 'uf\.F
conn = DBUtils.getConnection(); |*c\6 :
conn.setAutoCommit(false); o|;eMO-
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =Wk/q_.
for(int i=0;i<CountCache.list.size();i++){ e_~fJ
CountBean cb=(CountBean)CountCache.list.getFirst(); >AzWM
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CountCache.list.removeFirst(); 7}cDGdr
ps.setInt(1, cb.getCountId()); D@\;@(
|
ps.executeUpdate();⑴ H9san5{
//ps.addBatch();⑵ |!?WQ[
} s\C8t0C
//int [] counts = ps.executeBatch();⑶ ^L-w(r62<
conn.commit(); D_n}p8blT
}catch(Exception e){ :IR9=nhS]
e.printStackTrace(); $S=~YzO
} finally{ Ph#F<e(9
try{ p;u 1{
if(ps!=null) { ./&zO{|0]
ps.clearParameters(); ,s><kHJ
ps.close(); 'uKkl(==%
ps=null;
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#Fl
} ZG@M%|>
}catch(SQLException e){} VwOG?5W/
DBUtils.closeConnection(conn); puS&S
*
} E<<p_hX8R
} Yb%-tv:
public long getLast(){ .-KtB(t
return lastExecuteTime; ]KXMGH_
} 8L-4}!~C
public void run(){ "<w2v'6S
long now = System.currentTimeMillis(); M .)}e7
if ((now - lastExecuteTime) > executeSep) { ^6aS]t
//System.out.print("lastExecuteTime:"+lastExecuteTime); *K,hrpYR
//System.out.print(" now:"+now+"\n");
$' (QTEM
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ) Kc%8hBv
lastExecuteTime=now; *m$PH"
executeUpdate(); MZ5Y\-nq\
} 6
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else{ -!|WZ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :GQIlA8cF$
} .5Knb c
} )XP#W|;
} -.{oqs$
//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 4N~+G `
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类写好了,下面是在JSP中如下调用。 v.Xoq
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<% JYwyR++uo
CountBean cb=new CountBean(); >sQ2@"y)s2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); w!WRa8C
CountCache.add(cb); }U%^3r-
out.print(CountCache.list.size()+"<br>"); .~q)eV
CountControl c=new CountControl(); ;NH~9# t:
c.run(); !6zyJc@01
out.print(CountCache.list.size()+"<br>"); 3a#PA4Ql
%>