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: swnov[0
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CountBean.java }9Z?UtS
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/* @`?"#^jT
* CountData.java vGC^1AM
* )=X8kuB~
* Created on 2007年1月1日, 下午4:44 0bpl3Fh.v
* |_%|
* To change this template, choose Tools | Options and locate the template under /cr.}D2O
* the Source Creation and Management node. Right-click the template and choose 5sx-u!7
* Open. You can then make changes to the template in the Source Editor. Sg0 _ l(
*/ 1DGVAIcD
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package com.tot.count;
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/**
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* ~^IS{1
* @author t@!X1?`w
*/ q0w5ADd
public class CountBean { TjlKy
private String countType; aIZ@5w"7
int countId; h&5H`CR[
/** Creates a new instance of CountData */ U\
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public CountBean() {} \A5cM\-
public void setCountType(String countTypes){ M\8FjJ>9
this.countType=countTypes; n4ce)N@
} _pKW($\
public void setCountId(int countIds){ lbgnO s,
this.countId=countIds; M0 x5s@
} p H?VM&x
public String getCountType(){ +vLuzM-
return countType; Y1Bj++?2
} T8ZBQ;o
public int getCountId(){ =2)5_/9au
return countId; -(qoz8H5
} {`KgyCW:
} i,FG?\x@
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CountCache.java HPCgv?E3
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/* /^#k/z
* CountCache.java naXo <B
* B8|=P&L7N
* Created on 2007年1月1日, 下午5:01 Rmn| "ZK
* zV4%F"-
* To change this template, choose Tools | Options and locate the template under bUAjt>+
* the Source Creation and Management node. Right-click the template and choose IL}pVa00{n
* Open. You can then make changes to the template in the Source Editor. ?qw&H /R
*/ r1-?mMSU&
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package com.tot.count; -d%bc?
import java.util.*; RXt`y62yK
/** FD#?pVyPn^
* W&z.O
* @author zScV 9,H1
*/ GfJm&'U&
public class CountCache { k^]+I%?Q
public static LinkedList list=new LinkedList(); '7wI 2D
/** Creates a new instance of CountCache */ rd0BvQ9TK
public CountCache() {} 7u!R 'D
public static void add(CountBean cb){ OWB^24Z&3
if(cb!=null){ X||oiqbY
list.add(cb); h}z^NX
} 88pz<$
} qp
} emw3cQ
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CountControl.java }N2T/U
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/* zL3~,z/o
* CountThread.java *J8j_-i,R
* -Qiay/tlu
* Created on 2007年1月1日, 下午4:57 rNfua
* &{x5 |$SD
* To change this template, choose Tools | Options and locate the template under n9t8RcJS:
* the Source Creation and Management node. Right-click the template and choose @w,-T@nAW
* Open. You can then make changes to the template in the Source Editor. 'e7<&wm ia
*/ S=krF yFw
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package com.tot.count;
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import tot.db.DBUtils; S<88>|&n]
import java.sql.*; qK.8^{b
/** 2ztP'
* G5"UhnOD'
* @author RQ9fA1YP
*/ rbO9NRg>
public class CountControl{ ,U],Wu)
private static long lastExecuteTime=0;//上次更新时间 *1ku2e]z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -AD3Pd|Y[
/** Creates a new instance of CountThread */ 8.{5c6G
public CountControl() {} Ct|iZLh`j
public synchronized void executeUpdate(){ 9N5&N3
Connection conn=null; KNQX\-=
PreparedStatement ps=null; 8g(%6 ET
try{ x}AWWmXv
conn = DBUtils.getConnection(); h[ba$S,T
conn.setAutoCommit(false); TN.mNl%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Rl.3p<sX
for(int i=0;i<CountCache.list.size();i++){ +QtK
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CountBean cb=(CountBean)CountCache.list.getFirst(); 'F5&f9A
CountCache.list.removeFirst(); _?Rprmjx}
ps.setInt(1, cb.getCountId()); -+Kx^V#'R
ps.executeUpdate();⑴ w/~,mzM"
//ps.addBatch();⑵ w%S\)wjS
} TW{.qed8^
//int [] counts = ps.executeBatch();⑶ jC@$D*"J
conn.commit(); jXSo{
}catch(Exception e){ &Jk0SUk MP
e.printStackTrace(); uPr@xff
} finally{ Gi6sl_"q
try{ QyJ}zwD
if(ps!=null) { / /3iai
ps.clearParameters();
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ps.close(); VI74{='=
ps=null; r[q-O&2&
} Nm\0>}
}catch(SQLException e){} ht(RX
DBUtils.closeConnection(conn); c] $X+
} ltwX-
} ?y>P
public long getLast(){ .Quu_S_vH
return lastExecuteTime; [v^T]L
} B~D{p t3y
public void run(){ K;k_MA310
long now = System.currentTimeMillis(); J LT10c3
if ((now - lastExecuteTime) > executeSep) { W.r0W2))(
//System.out.print("lastExecuteTime:"+lastExecuteTime); iyB02\d
//System.out.print(" now:"+now+"\n"); t:eZ`6o$T\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); g"EvMv&
lastExecuteTime=now; sG=D(n1
executeUpdate(); hxP%m4xF +
} yS[:C
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else{ f-F+Y`P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); EeIV6ug
} YiJnh47
} A5S9F8Q/]
} ^HgQ"dD
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//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 {pH{SRM)B
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类写好了,下面是在JSP中如下调用。 $5yH(Z[[
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<% v8Vw.Ce`f
CountBean cb=new CountBean(); q_bE?j{
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); DzydS=`w
out.print(CountCache.list.size()+"<br>"); wzVx16Rvc
CountControl c=new CountControl(); X;lL$
c.run(); {;4Y5kj
out.print(CountCache.list.size()+"<br>"); IppzQ0'=y1
%>