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: .$S`J2Y
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CountBean.java Fc42TH
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/* nQg6
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* CountData.java TvMY\e
* f{5)yZ`J*
* Created on 2007年1月1日, 下午4:44 o_os;
* UHweV:(|T
* To change this template, choose Tools | Options and locate the template under C6O1ype
* the Source Creation and Management node. Right-click the template and choose z26zl[.
* Open. You can then make changes to the template in the Source Editor. \asF~P
*/ S 8h/AW6l
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package com.tot.count; lHz:Iibt
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/** )"|g&=
* Bn47O~
* @author `%F.]|Y0
*/ [-1Nn}
public class CountBean { I=Ws
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private String countType; 1 dI
int countId; o&gcFOM22
/** Creates a new instance of CountData */ wxr93$v
public CountBean() {} )N`ia%p_]
public void setCountType(String countTypes){ A^%z;( 0p
this.countType=countTypes; A3yVT8
} A$fd6+{
public void setCountId(int countIds){ 3"!2C,3c#
this.countId=countIds; )!p=0&z@{
} 6Z|/M6f
public String getCountType(){ &l{yEWA}g
return countType; %^gT.DsX-
} %+FM$xyJ
public int getCountId(){ =@V4V} ?
return countId; j08|zUe
} +JBhw4et;.
} 0O"GI33Mg
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CountCache.java z15(8Y@2]
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/* ANn{*h
* CountCache.java 7^as~5'&-
* W"VN2
* Created on 2007年1月1日, 下午5:01 GAtK1%nPD
* :#c? `>uV
* To change this template, choose Tools | Options and locate the template under W{ @lt}
* the Source Creation and Management node. Right-click the template and choose XC0G5rtB
* Open. You can then make changes to the template in the Source Editor. FhAuTZk
*/ fC]+C(*d
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package com.tot.count; (Qq! u
import java.util.*; oQWS$\Rr.
/**
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* DV*8Mkzg
* @author Nr3td`;
*/ %v
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public class CountCache { : gv[X
public static LinkedList list=new LinkedList(); aW4 tJN%!
/** Creates a new instance of CountCache */ o(C({]UO/
public CountCache() {} -(Taj[;[
public static void add(CountBean cb){ /2Y
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if(cb!=null){ 1S0Hc5vw
list.add(cb); J0mY=vX
} w0^( jMQe^
} *G>V`||RW
} Qf7]t-Kp
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CountControl.java =@gH$Q_1
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/* wC'KI8-
* CountThread.java UQ`%,D
* &FkKnz4IZ
* Created on 2007年1月1日, 下午4:57 n*@^c$&P
* eey <:n/Z
* To change this template, choose Tools | Options and locate the template under yTkYPx
* the Source Creation and Management node. Right-click the template and choose bN<c5
* Open. You can then make changes to the template in the Source Editor. d7$H})[^
*/ T*-*U/
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package com.tot.count; @*%Q,$
import tot.db.DBUtils; jr"yIC_
import java.sql.*; <s]K~ Vo
/** ,^:Zf|V
* Xdq2 .:\
* @author 3=T<c?[
*/ N$p}rh#7{
public class CountControl{ i*W8_C:S
private static long lastExecuteTime=0;//上次更新时间 w v9s{I{P
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 S;i^ucAF
/** Creates a new instance of CountThread */ 8[(c'rl|)|
public CountControl() {} X[h=UlF
public synchronized void executeUpdate(){ .Z'CqBr[:
Connection conn=null; &=X1kQG
PreparedStatement ps=null; QbxjfW"/+
try{ (@uQ>dR:
conn = DBUtils.getConnection(); g0cCw2S
conn.setAutoCommit(false); UyD=x(li
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); H,:Cg:E/^
for(int i=0;i<CountCache.list.size();i++){ (}gF{@sn
CountBean cb=(CountBean)CountCache.list.getFirst(); Q%o
CountCache.list.removeFirst(); ,Xo9gn
ps.setInt(1, cb.getCountId());
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ps.executeUpdate();⑴ FspI[gUN,
//ps.addBatch();⑵ J);1Tpm
} (<itE3P
//int [] counts = ps.executeBatch();⑶ ]/JE#
conn.commit(); A9p$5jt7
}catch(Exception e){ c c
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e.printStackTrace(); f.V0uBDN
} finally{ qaG%PH}a
try{ P,_GTs3/G
if(ps!=null) { *)L%pH>`
ps.clearParameters(); >~>=[M0
ps.close(); &AUL]:<s
ps=null; ?u'JhZ
} fnL!@WF
}catch(SQLException e){} |X~T</{8i
DBUtils.closeConnection(conn); V6BCW;
} j
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} N#Qby4w >
public long getLast(){ b0m1O.&I_
return lastExecuteTime; YAC=V?U-#
} _GI [SzD
public void run(){ VqVP5nT'=
long now = System.currentTimeMillis(); h9>~?1$lz
if ((now - lastExecuteTime) > executeSep) { HEht^/pJ
//System.out.print("lastExecuteTime:"+lastExecuteTime); czdNqk.kh
//System.out.print(" now:"+now+"\n"); 0O!%NL[,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); W{=>c/
lastExecuteTime=now; Gv?3}8Wp
executeUpdate(); d3 fE[/oU
} E88_15'3D
else{ e_\4(4x
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3/}=x<ui
} GB^Ch YOb
} goIn7ei92
} ]*sXISg1
//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 ]1abz:
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类写好了,下面是在JSP中如下调用。 +%UXI$v
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<% ?
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CountBean cb=new CountBean(); 7EQ
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); &q``CCOF&
CountCache.add(cb); %mtW-drv>
out.print(CountCache.list.size()+"<br>"); )nQpO"+M
CountControl c=new CountControl(); hh
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c.run(); Yt0
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out.print(CountCache.list.size()+"<br>"); 9p>3k&S
%>