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: 8T!+ZQAz
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CountBean.java j/_s"}m{
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/* ~,oMz<iMV
* CountData.java _lGdUt 2
* &3J_^210
* Created on 2007年1月1日, 下午4:44 XkXHGDEf 1
* ebUBrxZX
* To change this template, choose Tools | Options and locate the template under P(,p'I;j
* the Source Creation and Management node. Right-click the template and choose DVB{2~7 4
* Open. You can then make changes to the template in the Source Editor. ['B?i1 .
*/ &:dH,
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package com.tot.count; <b`E_
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/** =}DR)
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* Rn9m]x
* @author (`c
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*/ V C24sU
public class CountBean { 'E/^8md>
private String countType; D(AXk8Vub
int countId; T"E6y"D
/** Creates a new instance of CountData */ i+S)
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public CountBean() {} ?fUlgQ}N
public void setCountType(String countTypes){ Jrti
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this.countType=countTypes; r^3acXl
} -EkWs/'h
public void setCountId(int countIds){ G
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this.countId=countIds; $c:ynjL|P-
} )4<__|52"1
public String getCountType(){ W&&;:Fr
return countType; vd
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} HkUWehVm
public int getCountId(){ pgI^4h
return countId; q_g+Jf
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} )4gJd?
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} 6@{(;~r
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CountCache.java }L+L"l&
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/* %|g>%D3Z?
* CountCache.java TDFkxB>
* #h8Sq~0
* Created on 2007年1月1日, 下午5:01 zF8dKFE~
* )z73-M V"
* To change this template, choose Tools | Options and locate the template under q Gw -tPD<
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. njScz"L~
*/ +e yc`J
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package com.tot.count; 4'`{H@]tb
import java.util.*; \N!AXD
/** U(Nu%
* % NA9{<I
* @author fPn>v)lN{
*/ 5NS[dQG5
public class CountCache { %r%M lj:#
public static LinkedList list=new LinkedList(); KxYwJ
/** Creates a new instance of CountCache */ Rs-]N1V
public CountCache() {} "a
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public static void add(CountBean cb){ F)&@P-9+
if(cb!=null){ aY'C%^h]
list.add(cb); x(etb<!jd
} #{?PbBE}
} P9^-6;'Y
} >/kcdWl
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CountControl.java Q[vJqkgT
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/* Kwefs;<E?
* CountThread.java \Xm,OE_v"
* &]e'KdXF
* Created on 2007年1月1日, 下午4:57 s2'yY(u/
* q>$ev)W
* To change this template, choose Tools | Options and locate the template under ,SynnE68
* the Source Creation and Management node. Right-click the template and choose iYORu3
* Open. You can then make changes to the template in the Source Editor. Tl$[4heE
*/ L;VoJf
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package com.tot.count; iop2L51eJ
import tot.db.DBUtils; C([phT;
import java.sql.*; Vr6@>@SC
/** S1p;nK
* cC=[Saatsf
* @author 3 Nreqq
*/ f&eK|7J_Yf
public class CountControl{ ;1`fC@rI
private static long lastExecuteTime=0;//上次更新时间 R< ,`[* Z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -8eoNzut
/** Creates a new instance of CountThread */ :3XA!o&.T3
public CountControl() {} @&%'4j&+
public synchronized void executeUpdate(){ '(f&P=[b
Connection conn=null; <3xyjX'NE
PreparedStatement ps=null; x_|UPF
try{ 4}_j`d/8|
conn = DBUtils.getConnection(); ~$iIVJ`
conn.setAutoCommit(false); P3cR l']
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); _LMM,!f
for(int i=0;i<CountCache.list.size();i++){ !>{G,\^=pT
CountBean cb=(CountBean)CountCache.list.getFirst(); TH; R
CountCache.list.removeFirst(); & -{DfNK c
ps.setInt(1, cb.getCountId()); {5%5}[/x
ps.executeUpdate();⑴ %\D)u8}
//ps.addBatch();⑵ C~nzH,5
} ^B(V4-|
//int [] counts = ps.executeBatch();⑶ Bt>}rYz1
conn.commit(); =Z P%mW&;}
}catch(Exception e){ WM| dKF
e.printStackTrace(); wfU7G[
} finally{ eqP&8^HP
try{ .z)%)PVV
if(ps!=null) { w[9|cgCY
ps.clearParameters(); Bg&i63XL$$
ps.close(); 0Fk5kGD,&K
ps=null; :*ing
} 0y
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}catch(SQLException e){} -BRc8 /
DBUtils.closeConnection(conn); xIxn"^'
} sm0x LZ
} 5b!vgm#])
public long getLast(){ -~v|Rt
return lastExecuteTime; uJFdbBDSh
} U7`A497Z
public void run(){ yRSTk2N@
long now = System.currentTimeMillis(); XWA:J^
if ((now - lastExecuteTime) > executeSep) { J)`-+}7$v
//System.out.print("lastExecuteTime:"+lastExecuteTime); f|h|q_<;
//System.out.print(" now:"+now+"\n"); :n0vQ5a
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); h\5OrD@L
lastExecuteTime=now; ln?v
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executeUpdate(); ;'5>q&[qbP
} (d(hR0HKE
else{ ;pqg/>W'
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); PJ]];MQ
} ]$Yvj!K*Q
} Fs{x(_LOr
} Y%PwktQm
//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 ~aMlr6;
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类写好了,下面是在JSP中如下调用。 ^cczJOxB
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<% 5jd,{<
CountBean cb=new CountBean(); R%Q@
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); b~'"^ Bts*
CountCache.add(cb); V,q](bg
out.print(CountCache.list.size()+"<br>"); `S6x<J&T\/
CountControl c=new CountControl(); Sx?ua<`:d
c.run(); JHz
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out.print(CountCache.list.size()+"<br>"); pQshUm"_
%>