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: hK@1
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CountBean.java jzI\Q{[m'
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/* GJy><'J,!>
* CountData.java 00%$?Fyk
* 1#(,Bq4
* Created on 2007年1月1日, 下午4:44 2OAh7 '8<
* "%A/bv\u
* To change this template, choose Tools | Options and locate the template under VaZS_qGe:
* the Source Creation and Management node. Right-click the template and choose zO9$fU
* Open. You can then make changes to the template in the Source Editor. M_T$\z;,
*/ 7w@.)@5
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package com.tot.count; j
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/** 0"#tK4
* ;T"}dJel#
* @author 6IPhy.8
*/ ^KF
public class CountBean { w{F8]N>0<
private String countType; h[C!cX
int countId; G&/}P$
/** Creates a new instance of CountData */ fyYv}z
public CountBean() {} .2.$Rq
public void setCountType(String countTypes){ feIAgd},
this.countType=countTypes; wx}\0(]Gl
} BtBy.bR
public void setCountId(int countIds){ f|Z3VS0x
this.countId=countIds; iWCN2om
} ^-~.L: }q
public String getCountType(){ .Ky<9h.K
return countType; fT[6Cw5w`
} gO*cX&
public int getCountId(){ 'RQZU*8
return countId; =H>rX
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} #MHnJ
} _UjAct]6
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CountCache.java >kz5azV0
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/* /B|#GJ\\3
* CountCache.java #c+N}eX{
* QMy;?,
* Created on 2007年1月1日, 下午5:01 WYRTt2(+%
* v^[tK2&v
* To change this template, choose Tools | Options and locate the template under .{5)$w>
* the Source Creation and Management node. Right-click the template and choose wCMsaW
* Open. You can then make changes to the template in the Source Editor. dvyE._/v
*/ u\^<V)
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package com.tot.count; K?-K<3]9f
import java.util.*; 45/f}kvy
/** O5Yk=-_m
* c*~/[:}
* @author wh|[
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*/ C0i: *1
public class CountCache { ?Sn$AS I
public static LinkedList list=new LinkedList(); ;L(W'+
/** Creates a new instance of CountCache */ ?7^('
public CountCache() {} .N_0rPO,Kw
public static void add(CountBean cb){ *S~. KW [
if(cb!=null){ )\`TZLR
list.add(cb); ^w8H=UkP!+
} u$t*jw\fHg
} LP@Q8{'
} XXuU@G6Z7$
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CountControl.java L.U [eH
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/* ~K:#a$!%,
* CountThread.java ]hF[f|V
* a=p3oh?%-O
* Created on 2007年1月1日, 下午4:57 [%P_
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* MA(\r
* To change this template, choose Tools | Options and locate the template under F=iz\O!6
* the Source Creation and Management node. Right-click the template and choose S.t+HwVodO
* Open. You can then make changes to the template in the Source Editor. <%>Q$b5
*/ 9m!4 U2N,s
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package com.tot.count; ``w,CP ?
import tot.db.DBUtils; C~'}RM
import java.sql.*; T*k
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/** Q!GB^P
* hrU.QF8
* @author ;fee<7Ty
*/ Xa[gDdbL
public class CountControl{ nt "VH5
private static long lastExecuteTime=0;//上次更新时间 %
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 N(t1?R/e,
/** Creates a new instance of CountThread */ swi|
public CountControl() {} &p8K0 |
public synchronized void executeUpdate(){ LNXhzW
Connection conn=null; MCL?J,1?r
PreparedStatement ps=null; Y_Ej-u+>{
try{ pL-p
conn = DBUtils.getConnection(); xzW]D0o0
conn.setAutoCommit(false); ^uIZs}=+
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); wbd>By(T1
for(int i=0;i<CountCache.list.size();i++){ {-Yp~HQF
CountBean cb=(CountBean)CountCache.list.getFirst(); GG(rp]rgl
CountCache.list.removeFirst(); U+~0m!|4
ps.setInt(1, cb.getCountId()); {(ey!O
ps.executeUpdate();⑴ uO,90g[C/R
//ps.addBatch();⑵ 3<m"z9$
} HQ/PHUg2
//int [] counts = ps.executeBatch();⑶ bi#o1jR
conn.commit(); D'Byl,W$
}catch(Exception e){ n U$Lp`
e.printStackTrace(); ,8+SQo#3
} finally{ p8Lb*7W
try{ )"t=sFxaB
if(ps!=null) { bC?t4-W
ps.clearParameters(); Wj.)wr!
ps.close(); =]-!
ps=null; c!{.BgGN
} e3)rF5pp
}catch(SQLException e){} C*kZ>mbc
DBUtils.closeConnection(conn); W`6nMFg
} VIAj]Ul
} (zk'i13#6
public long getLast(){ Sh2q#7hf
return lastExecuteTime; >,uof ?
} Xw9,O8}C7
public void run(){ e)!X9><J
long now = System.currentTimeMillis(); ]~3wq[O
if ((now - lastExecuteTime) > executeSep) { zHDC8m
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9OF5A<%"u
//System.out.print(" now:"+now+"\n"); {YK6IgEsJe
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^a<=@0|
lastExecuteTime=now; WAqR70{KM
executeUpdate(); isWB)$q
} 'e;*V$+
else{ [A*vl9=
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Gxm+5q
} |],{kUIXO
} ""CJlqU
} 2$qeNy
//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 pOIFO=k
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类写好了,下面是在JSP中如下调用。 "Q2[A]4E
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<% cl:*Q{(Cjk
CountBean cb=new CountBean(); AGK+~EjL@
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); g@B9i=
CountCache.add(cb); #\%GrtM
out.print(CountCache.list.size()+"<br>"); t~sW]<qjp
CountControl c=new CountControl(); MT%ky
c.run(); s![=F}ck
out.print(CountCache.list.size()+"<br>"); 5A~w_p*}
%>