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: Z0@ImhejuB
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CountBean.java c.> (/
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/* "C|l3X'
* CountData.java CzbNG^+
* +u)$o
* Created on 2007年1月1日, 下午4:44 PA[Rhoit,
* L-T Ve
* To change this template, choose Tools | Options and locate the template under 'Z9F0l"Nr
* the Source Creation and Management node. Right-click the template and choose Y3&ecEE
* Open. You can then make changes to the template in the Source Editor. F'Vl\qPt
*/ `a9>4
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package com.tot.count; *a.*Ha
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/** WHT%m|yn
* \C.@ @4{
* @author tS@/Bq('B
*/ D'+8]B
public class CountBean { bS"M*
private String countType; {NDe9V5
int countId; h0pr"]sO;$
/** Creates a new instance of CountData */ o\gQYi
public CountBean() {} \mGM#E
public void setCountType(String countTypes){ Ji=iq=S7
this.countType=countTypes; r $2
} vGDo?X~#o
public void setCountId(int countIds){ 9^olAfX`dB
this.countId=countIds; oa7Hx<Y
} MPc=cLv
public String getCountType(){ uwzT? C A6
return countType; K>6p5*&
} znRhQ+8;!
public int getCountId(){ g>CQO,s;w
return countId; M*uG`Eo&
} {P+[CO
} jXR+>=_
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CountCache.java g{(nt5|^l
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/* z5/O8}Gz@
* CountCache.java JR)rp3o-
* %W+Fe,]
* Created on 2007年1月1日, 下午5:01 [J
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* 9m!fW|4
* To change this template, choose Tools | Options and locate the template under B/}>UHM
* the Source Creation and Management node. Right-click the template and choose 55\mQ|.Jn
* Open. You can then make changes to the template in the Source Editor. .@V>p6MV
*/ B:.rp.1
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package com.tot.count; z`SkKn0f
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import java.util.*; [t'"4
/** \:7EKzQ
* //|Vj | =
* @author P!EX;+7+x
*/ g7-K62bb
public class CountCache { N R{:4zJT
public static LinkedList list=new LinkedList(); 4r&~=up]
/** Creates a new instance of CountCache */ '~0&m]N
public CountCache() {} ?CDq^)T[
public static void add(CountBean cb){ q4oZJ -`
if(cb!=null){ i2E7$[
list.add(cb); e+TNG &_
} 5c8x:
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} N5DS-gv
} b.&YUg[#
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CountControl.java cO9Aw !
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/* .VT,,0
* CountThread.java Is[0ri
* ":ycyN@g
* Created on 2007年1月1日, 下午4:57 79_MP
* {{\HU0g>&
* To change this template, choose Tools | Options and locate the template under Z%R^;8 !~
* the Source Creation and Management node. Right-click the template and choose #4>F%_
* Open. You can then make changes to the template in the Source Editor. XLT<,B}e
*/ W!*vO>^1W
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package com.tot.count; \mloR
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import tot.db.DBUtils; '>BHwc
import java.sql.*; r^)<Jy0|r
/** =B1!em|
* ;Lu|fQ#u*
* @author jC%I]#!n
*/ ! ZEKvW
public class CountControl{ 3$54*J
private static long lastExecuteTime=0;//上次更新时间 dQ]j
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒
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/** Creates a new instance of CountThread */ }: e9\r)
public CountControl() {} l<+k[@Vox
public synchronized void executeUpdate(){ 3Daq5(fLP
Connection conn=null; xmDwoLU
PreparedStatement ps=null; :|Cf$2k7
try{ 9tO_hhEQ@
conn = DBUtils.getConnection(); Ai;Pht9qi
conn.setAutoCommit(false); -5K/ cK
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2X`M&)"X
for(int i=0;i<CountCache.list.size();i++){ Yi`.zm
CountBean cb=(CountBean)CountCache.list.getFirst(); tN~{Mt$-W
CountCache.list.removeFirst(); "2J;~
ps.setInt(1, cb.getCountId()); szHUHW~;J
ps.executeUpdate();⑴ <3KrhhH
//ps.addBatch();⑵ {$^|^n5j
} v]v f(]""
//int [] counts = ps.executeBatch();⑶ mD!imq%=
conn.commit(); _ sd?l
}catch(Exception e){ gK /K Z8
e.printStackTrace(); 4)_ [)MZ\j
} finally{ e]QkZg2?Yn
try{ V]2Q92
if(ps!=null) { @p;4g_F
ps.clearParameters(); Dts:$PlCk
ps.close(); AO6;aT
ps=null; F+GQ l
} <S
qbj;
}catch(SQLException e){} b~}}{fm&f
DBUtils.closeConnection(conn); M%/D:0
} rYl37.QE
} sdLFBiR
public long getLast(){ >:=TS"}yS}
return lastExecuteTime; 2r,fF<WQ
} `8I&(k<wLe
public void run(){ @OpcS>:R
long now = System.currentTimeMillis(); 0^=S:~G
if ((now - lastExecuteTime) > executeSep) { qF?S[Z;
//System.out.print("lastExecuteTime:"+lastExecuteTime); <qBPN{'a"
//System.out.print(" now:"+now+"\n"); dZ*o H#B
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); dn Xc- <
lastExecuteTime=now; t%)L8%Jr
executeUpdate(); vzL>ZBeZ
} ]#nAld1cmy
else{ <FP-]R)
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 39"'Fz?1
} f]Vz !hM~
} 0*q:p`OLw*
} eMs`t)rQ
//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 B?jF1F!9
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类写好了,下面是在JSP中如下调用。 k(MQ:9'|
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<% cMj<k8.{
CountBean cb=new CountBean(); x\*5A,w{c]
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); *jYwcW"R{z
out.print(CountCache.list.size()+"<br>"); 9} vWTt0
CountControl c=new CountControl(); zMa`olTZ
c.run(); qcK)J/K"
out.print(CountCache.list.size()+"<br>"); ^/c|s!U^
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