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: `M7){
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CountBean.java 40g&zU-
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/* 3\(s=-vh
* CountData.java /itO xrA
* .}Zmqz[
* Created on 2007年1月1日, 下午4:44 ]/$tt@h
* 'rR\H2b
* To change this template, choose Tools | Options and locate the template under ;m`I}h<
* the Source Creation and Management node. Right-click the template and choose }kOhwT8sI
* Open. You can then make changes to the template in the Source Editor. ~{5%~8h.0r
*/ Fa/i./V2
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package com.tot.count; vG\Wr.h0!=
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/** v>nJy~O]
* 10[~ki-1;
* @author LXXxwIBS
*/ p19Zxh
public class CountBean { zJ9,iJyuD
private String countType; [ B (lJz
int countId; O'wN4qb=F
/** Creates a new instance of CountData */ 4h~Oj
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public CountBean() {} L7jz^g^
public void setCountType(String countTypes){ Q z/pz_}
this.countType=countTypes; 8F[j}.8q
} VX>_Sps
public void setCountId(int countIds){ [9LYR3 p
this.countId=countIds; vuAAaKz
} hh8UKEM-
public String getCountType(){ 17
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return countType; ]&r/H17
} Yd<~]aXM
public int getCountId(){ -d[x09
return countId; S`6'~g
} V) a6H^l
} 7=<PVJ*/
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CountCache.java \`XJz{Lm]
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/* 't|F}@HP
* CountCache.java !tbRqW6v
* lo(Ht=d
* Created on 2007年1月1日, 下午5:01 u>(Q& 25
* ,\qo
* To change this template, choose Tools | Options and locate the template under C$%QVcf
* the Source Creation and Management node. Right-click the template and choose l+N?:E$5=%
* Open. You can then make changes to the template in the Source Editor. =}q4ked/
*/ PO}Q8Q3
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package com.tot.count; @O3w4Zs
import java.util.*; w_{z"VeD
/** +}Q4 g]M8
* c:$:j,i}
* @author #mM&CscE
*/ oVhw2pKpM
public class CountCache { z%AIv%
public static LinkedList list=new LinkedList(); J%A`M\
/** Creates a new instance of CountCache */ \hq8/6=4s
public CountCache() {} Q3/q%#q>
public static void add(CountBean cb){ VAthQ<
if(cb!=null){ ~/#?OLj(T
list.add(cb); lGM3?AN
}
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} K9P"ncMt
} b\+|g9Tm
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CountControl.java JRiuU:=J~`
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/* Pw7'6W1
* CountThread.java YVaQ3o|!
* 2h:f6=)r/u
* Created on 2007年1月1日, 下午4:57 05zHL j
* ~XxD[T5
* To change this template, choose Tools | Options and locate the template under :^*V[77
* the Source Creation and Management node. Right-click the template and choose vV'^HD^v
* Open. You can then make changes to the template in the Source Editor. Z8 # I
*/ :E^B~ OuL
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package com.tot.count; I^wj7cFo5
import tot.db.DBUtils; FU [,,a0<<
import java.sql.*; [@y=%\%R
/** q-o>yjT~
* lt$797
* @author 0Fw\iy1o
*/ ps[6)d)o
public class CountControl{ A,og9<+j-
private static long lastExecuteTime=0;//上次更新时间 lxmS.C
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 XVLuhwi
/** Creates a new instance of CountThread */ <s2l*mc
public CountControl() {} = ;a4
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public synchronized void executeUpdate(){ Y5NbY02E
Connection conn=null; TZP{=v<
PreparedStatement ps=null; mQvKreo~
try{ _Pz3QsV9
conn = DBUtils.getConnection(); j(BS;J$i
conn.setAutoCommit(false); |HU
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :aqh8bv
for(int i=0;i<CountCache.list.size();i++){ \|pAn
CountBean cb=(CountBean)CountCache.list.getFirst(); T7T!v
CountCache.list.removeFirst(); 3D.S[^s*
ps.setInt(1, cb.getCountId()); [!q&r(-K
ps.executeUpdate();⑴ 2at?9{b
//ps.addBatch();⑵ /j)VES
} WV @Tm$r
//int [] counts = ps.executeBatch();⑶ $`Xx5Ts7
conn.commit(); Y-Ku2m
}catch(Exception e){ _l,Z38
e.printStackTrace(); P3yiJ|vP
} finally{ E5t+;vL~
try{ 1;xw)65
if(ps!=null) { "^=[*i
ps.clearParameters(); 9e)+<H
ps.close(); PVU"oz&T
ps=null; B0
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} (XwLKkw0n
}catch(SQLException e){} uy9B8&Sr
DBUtils.closeConnection(conn); pjCWg4ya
} )e2IT*7
} `p{!5
public long getLast(){ h]MVFn{
return lastExecuteTime; YKg[k:F
} RsD`9>6)
public void run(){ t(Zs*c(
long now = System.currentTimeMillis(); 9v
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if ((now - lastExecuteTime) > executeSep) { JAb?u.,Ns_
//System.out.print("lastExecuteTime:"+lastExecuteTime); PM.SEzhm
//System.out.print(" now:"+now+"\n"); p<zXuocQ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {e%abr_B
lastExecuteTime=now; ThlJhTh<%4
executeUpdate(); >a7(A#3@d
} eE{L>u
else{ :.Qe=}9
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); sBb.Y
k
} U>+~.|'V9
} N39nJqo>"
} :]^P^khK
//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 9sCk\`n
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类写好了,下面是在JSP中如下调用。 WDGGT.h G
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<% D;I`k
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CountBean cb=new CountBean(); 3N"&P@/0x
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); jDX<iX%e
CountCache.add(cb); ]`sIs= _[
out.print(CountCache.list.size()+"<br>"); 8T)zB6ng
CountControl c=new CountControl(); W#L"5pRg
c.run(); AMd)d^;
out.print(CountCache.list.size()+"<br>"); bVeTseAG
%>