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: co9 .wB@
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CountBean.java K91)qI;BD
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/* e _/b2"{
* CountData.java j{NNSi3
* /Wy.>YC|
* Created on 2007年1月1日, 下午4:44 'Er:a?88l
* ]R=,5kK3
* To change this template, choose Tools | Options and locate the template under #{=;NuP
* the Source Creation and Management node. Right-click the template and choose e_V O3"
* Open. You can then make changes to the template in the Source Editor. :PtF+{N>
*/ ppFe-wY
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package com.tot.count; 2 Sh
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/** ]ut5S>,"
* $ZNu+tn
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* @author $dA-2e10
*/ 3"G>>nC&
public class CountBean { 8HR mQ
private String countType; e0J6Ae4V[
int countId; ~t^eiyv
/** Creates a new instance of CountData */ LrATSq@
public CountBean() {} Ma+$g1$
public void setCountType(String countTypes){ bks/`rIA
this.countType=countTypes; ed:@C?
} Z7RiPSdxp
public void setCountId(int countIds){ m+#iR}*1L
this.countId=countIds; ET[kpL
} TOoQZTI
public String getCountType(){ SF5@Vg
return countType; i:Zm*+Gi
} $2u 'N:o
public int getCountId(){ +e-G,%>9
return countId; JqMDqPIQ
} ZKXo-~=>
} !>>f(t4
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CountCache.java cKn`/\.H
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/* 1*dRK6
* CountCache.java Bf$_XG3
* #?XQ7Im
* Created on 2007年1月1日, 下午5:01 l2&`J_"
* (XXheC
* To change this template, choose Tools | Options and locate the template under P9S2?Q
* the Source Creation and Management node. Right-click the template and choose |QMhMGjV
* Open. You can then make changes to the template in the Source Editor. V=lfl1Ev0J
*/ I8QjKI (
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package com.tot.count; x ul]m*Z
import java.util.*; IXb}AxBf
/** =&},;VOh
* \4AM*lZ
* @author qY>{cjo
*/ tqy@iEz+
public class CountCache { eYC ^4g%l(
public static LinkedList list=new LinkedList(); **+e7k
/** Creates a new instance of CountCache */ BbRBT@
public CountCache() {} ^1wA:?uN}
public static void add(CountBean cb){ NuYkz"O]
if(cb!=null){ Y2O"]phi@
list.add(cb); ;/0 Q1-
} !o>H1#2l
} /[9t`
} e5OsIVtjr
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CountControl.java /"?HZ% W
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/* z.6$W^
* CountThread.java Gdg)9
* HXoX
* Created on 2007年1月1日, 下午4:57 9W8]8sUeG
* %J8|zKT5t
* To change this template, choose Tools | Options and locate the template under @?[1_g_'P
* the Source Creation and Management node. Right-click the template and choose !=y]Sv~h
* Open. You can then make changes to the template in the Source Editor. ^+
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*/ r)T:7zy
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package com.tot.count; 4pln5v=
import tot.db.DBUtils; Qjnd6uv{I
import java.sql.*; ;P;((2_X9
/** *#TYqCc+g
* {VP$J"\e
* @author k64."*X
*/ TI !a )X
public class CountControl{
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private static long lastExecuteTime=0;//上次更新时间 ~h"/Tce
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8`b`QtGf
/** Creates a new instance of CountThread */ IQ!\w-
public CountControl() {} *c)uGz'cD
public synchronized void executeUpdate(){ /1 RAAa
Connection conn=null; \V>?Do7
PreparedStatement ps=null; x)UwV
try{ !J=sk4T
conn = DBUtils.getConnection(); )I\=BPo|B
conn.setAutoCommit(false); ||zb6|7I4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :iiw3#]
for(int i=0;i<CountCache.list.size();i++){ J|3E- p\o
CountBean cb=(CountBean)CountCache.list.getFirst(); qClHP)<
CountCache.list.removeFirst(); HK~xOAF
ps.setInt(1, cb.getCountId()); ,KJw|x4}\
ps.executeUpdate();⑴ UYA_jpI P
//ps.addBatch();⑵ e;GU
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} 2..,Sk
//int [] counts = ps.executeBatch();⑶ ~Xlrvb}LP
conn.commit(); x'zBK0i
}catch(Exception e){ )XfzLF7
e.printStackTrace(); HAYMX:%
} finally{ Jjl%R[mI
try{ ms_ VM>l
if(ps!=null) { `+#G+Vu5
ps.clearParameters(); xBFJ} v
ps.close(); }P3tn
ps=null; 'u4ezwF;
} zd]D(qeX
}catch(SQLException e){} TrdZJ21#M
DBUtils.closeConnection(conn); KvQ,;A
} CAT.4GM
} !vn1v)6
public long getLast(){ >23-
return lastExecuteTime; efG6v
} "C?5f]T
public void run(){ AkU<g
long now = System.currentTimeMillis(); ?%O3Oi Xz
if ((now - lastExecuteTime) > executeSep) { j$da8] !
//System.out.print("lastExecuteTime:"+lastExecuteTime); _al|'obomy
//System.out.print(" now:"+now+"\n"); L'i-fM[#
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pr,p=4m{\
lastExecuteTime=now; )s9',4$eK<
executeUpdate(); $DBGLmw
} @FN*TJ
else{ `O^G5 0
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |BZDhd9<{
} WS2osBc
} ^Cv^yTj;&
} ]l~Vi_c
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 O8U<{jgAG
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类写好了,下面是在JSP中如下调用。 as+GbstN
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<% /Jf~25F
CountBean cb=new CountBean(); ,&HR(jTo
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); OOBhbpg!D
CountCache.add(cb); zu2HH<E
out.print(CountCache.list.size()+"<br>"); >%Ee#m
CountControl c=new CountControl(); >\<*4J$PZ
c.run(); }]UB;id'
out.print(CountCache.list.size()+"<br>"); :
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%>