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: pY~/<lzW
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CountBean.java }Quk n
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/* $@Bd}35 J
* CountData.java F<V.OFt
* 2gasH11M
* Created on 2007年1月1日, 下午4:44 *\$m1g7b
* m%ec=%L9
* To change this template, choose Tools | Options and locate the template under !B*l'OJw
* the Source Creation and Management node. Right-click the template and choose +nAbcBJAl
* Open. You can then make changes to the template in the Source Editor. 4*U5o!w1{
*/ 6 2*p*t
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package com.tot.count; VY#nSF`
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/** E4QLXx6Wa&
* y2`},
* @author 7oy}<9
*/ 7:C_{\(
public class CountBean { wU}%]FqtZ=
private String countType; &7J-m4BI
int countId; %&iodo,EP'
/** Creates a new instance of CountData */ +0l-zd\
public CountBean() {} Q\W?qB_
public void setCountType(String countTypes){ 9$q35e
this.countType=countTypes; jLM}hwJ8
} `R!%k]$
public void setCountId(int countIds){ L*#W?WMM
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this.countId=countIds; VbI$#;:[7
} |Cm6RH$(
public String getCountType(){ Ee3-oHa
return countType; ,{C
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} :<P3fW
public int getCountId(){ 2MU$OI0|
return countId; \1ncr4
} BjyV&1tRV!
} $Ph#pM(
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CountCache.java %,UTFuM`
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/* }' p"q)
* CountCache.java %dwI;%0
* kNd(KQ<.17
* Created on 2007年1月1日, 下午5:01 ^wIg|Gc
* i5 0c N<o
* To change this template, choose Tools | Options and locate the template under *S<d`mp[
* the Source Creation and Management node. Right-click the template and choose z&c|2L-u6
* Open. You can then make changes to the template in the Source Editor. |)65y
*/ QOR92}yC
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package com.tot.count; WYN0,rv1:+
import java.util.*; iLt2L;v>h
/** tMiy`CPh
* 3GL,=q
* @author )^`V{iD
*/ G]n_RP$G
public class CountCache { Al1}Ir
public static LinkedList list=new LinkedList(); U#G<cV79
/** Creates a new instance of CountCache */ 2!_DkE
public CountCache() {} 8F
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public static void add(CountBean cb){ Ge`PVwn
if(cb!=null){ /# d^
list.add(cb); K(,MtY*
} YuUJgt .1
} |ju+{+
} W#@6e')d
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CountControl.java ,MjlA{0
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/* /Un\P
* CountThread.java - -\eYVh[
* `x`zv1U
* Created on 2007年1月1日, 下午4:57 .lAPlJOO
* bA1O]:`
* To change this template, choose Tools | Options and locate the template under >a;LBQ0
* the Source Creation and Management node. Right-click the template and choose )Ut K9;@"
* Open. You can then make changes to the template in the Source Editor. q 2P_37
*/ PJO.^OsM
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package com.tot.count; t$&'mJ_-w
import tot.db.DBUtils; zZW5M^z8
import java.sql.*; "/yS HB[
/** Pm]lr|Q{I
* *P/DDRq(2
* @author Ss3~X90!*B
*/ Q?bCQZ{-Lh
public class CountControl{ %ol\ sO|
private static long lastExecuteTime=0;//上次更新时间 1QPz|3f@\
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ga_Pt8L6
/** Creates a new instance of CountThread */ 8,IQ6Or|-2
public CountControl() {} I7\T :Q[
public synchronized void executeUpdate(){ qe5;Pq !G
Connection conn=null; ~d3|zlh
PreparedStatement ps=null; cw,|,uXq
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try{ vq+4so
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conn = DBUtils.getConnection(); 2Ab`i!#
conn.setAutoCommit(false); bcUSjG>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o:B?hr'\
for(int i=0;i<CountCache.list.size();i++){ &]tm'N25
CountBean cb=(CountBean)CountCache.list.getFirst(); Xf[;^?]X
CountCache.list.removeFirst(); r PTfwhs
ps.setInt(1, cb.getCountId()); %d%FI"!K
ps.executeUpdate();⑴ P]iJ"d]+X
//ps.addBatch();⑵ ?OPuv5!pI
} |l-O e
//int [] counts = ps.executeBatch();⑶ RBfzti6
conn.commit(); V,%K"b=
}catch(Exception e){ IE3GZk+a~
e.printStackTrace(); F1S0C>N?5
} finally{ 1(pv3
try{ Nt;1&dwUb
if(ps!=null) { (f2r4Io|}
ps.clearParameters(); _F(Np\%_
ps.close(); 9C8 G(r
ps=null; $o.;}
} T[I7.8g
}catch(SQLException e){} bXeJk]#y
DBUtils.closeConnection(conn); *&tTiv{^
} a)*(**e$*i
} iaJLIr l
public long getLast(){ H&
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return lastExecuteTime; 6HPuCP
} *+k
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public void run(){ l_4^TYF
long now = System.currentTimeMillis(); Cd]g+R}j
if ((now - lastExecuteTime) > executeSep) { P'o]#Az
//System.out.print("lastExecuteTime:"+lastExecuteTime); ^ p7z3ng
//System.out.print(" now:"+now+"\n"); A9KPU:
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Qp7F3,/#
lastExecuteTime=now;
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executeUpdate(); /x)i}M)
} @r^s70{}
else{ l$kO%E'
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); x:Q$1&3N
} 3ZbqZ"rE
} #]Lodo9rS\
} N{}8Zh4op
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 (J?_~(,`"
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类写好了,下面是在JSP中如下调用。 F2MC)
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<% "bB0$>0,
CountBean cb=new CountBean(); %QQ 2u$
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); >4q6
CountCache.add(cb); .2U3_1dX
out.print(CountCache.list.size()+"<br>"); =7#"}%4Q
CountControl c=new CountControl(); L]H'
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c.run(); N`{6<Z0
out.print(CountCache.list.size()+"<br>"); ZNl1e'
%>