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: VVac:
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CountBean.java %<k2#6K
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/* hL/)|N~
* CountData.java K&POyOvT
* e-:yb^
* Created on 2007年1月1日, 下午4:44 E27vR 7
* |L%Z,:yO
* To change this template, choose Tools | Options and locate the template under ?5C!<3gM)
* the Source Creation and Management node. Right-click the template and choose LPZF)@|`
* Open. You can then make changes to the template in the Source Editor. V=R 3)GC
*/ P\yDa*m
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package com.tot.count; \|H!~) h$1
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/** Kf>A\l^X7
* fmQ_P.c
* @author R9'b-5q
*/ OBMTgZHxv
public class CountBean { 0rOfrTNOz%
private String countType; gbI^2=YT'
int countId; tQ8.f
/** Creates a new instance of CountData */ m+b):
public CountBean() {} ?%O(mC]u&
public void setCountType(String countTypes){ S0B|#O%Z
this.countType=countTypes; % W=b?:
} `);AW(Q
public void setCountId(int countIds){ Xnz3p"
this.countId=countIds; 6hlc1?
} oI=fx Sjd
public String getCountType(){ ukIQr/k
return countType; o^^rJk
} GR
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public int getCountId(){ z2MWN\?8
return countId; :# .<[
} u])b,9&En
} W~zbm]
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CountCache.java lhYe;b(
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/* kddZZA3`
* CountCache.java 7Nk!1s:
* Ka[t75~;
* Created on 2007年1月1日, 下午5:01 QIB\AAclO
* ]QpWih00V
* To change this template, choose Tools | Options and locate the template under I/&%]"[^u
* the Source Creation and Management node. Right-click the template and choose tZ'|DCT
* Open. You can then make changes to the template in the Source Editor. wCr(D>iM
*/ fuWO*
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package com.tot.count; qu-B|
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import java.util.*; ~tBYIkvWT
/** {l>yi
* B.dH(um
* @author .ni_p 6!
*/ 4(|cG7>9-
public class CountCache { ba[1wFmcL
public static LinkedList list=new LinkedList(); qHuZcht
/** Creates a new instance of CountCache */ v-#Q7T
public CountCache() {} #pb92kA'
public static void add(CountBean cb){ e4!:c^?
if(cb!=null){ X' d9[).
list.add(cb); $ {O#
} Km(n7Ah"
} $"FQj4%d
} jBgP$g
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CountControl.java =<{np
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/* P0W*C6&71|
* CountThread.java *pSQU=dmS
* [3(74
* Created on 2007年1月1日, 下午4:57 +Af"f' )
* [U5\bX@$
* To change this template, choose Tools | Options and locate the template under kS_(wpA
* the Source Creation and Management node. Right-click the template and choose `Gn50-@
* Open. You can then make changes to the template in the Source Editor. s$cK(S#
*/ b6U2GDm\s
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package com.tot.count; #:[t^}
import tot.db.DBUtils; qv]}$WU
import java.sql.*; vgsJeV`}I
/** '
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* g]4(g<:O
* @author qAn! Rk A
*/ Ov-icDMm
public class CountControl{ OW3sS+y
private static long lastExecuteTime=0;//上次更新时间 w2
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 \HKxh:F'
/** Creates a new instance of CountThread */ YL]Z<%aKt
public CountControl() {} |G?htZF
public synchronized void executeUpdate(){ Y8m1M-#w
Connection conn=null; .#rJ+.2
PreparedStatement ps=null; `(YxI
try{ umiBj)r
conn = DBUtils.getConnection(); E%rk[wI
conn.setAutoCommit(false); .}O[dR
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); K_RjX>q%N
for(int i=0;i<CountCache.list.size();i++){ )(ImLbM)
CountBean cb=(CountBean)CountCache.list.getFirst(); 6^eV"&+@
CountCache.list.removeFirst(); 77\]B
ps.setInt(1, cb.getCountId()); 8,C*4y~
ps.executeUpdate();⑴ y~q8pH1
//ps.addBatch();⑵ T)H{
} H5Z$*4%G
//int [] counts = ps.executeBatch();⑶ q35f&O;
conn.commit(); 7]blrN]
}catch(Exception e){ 4)A#2
e.printStackTrace(); ,Wk?I%>
} finally{ H."EUcE{
try{ d-k%{eBV
if(ps!=null) { {]:7bV#JP
ps.clearParameters(); U)E(`{p]
ps.close(); >8k_n
ps=null; GBRa.;Kk
} ^Wt*
}catch(SQLException e){} xT
DBUtils.closeConnection(conn); .(^ ,z&
} f33 l$pOp
} - `p4-J!Fy
public long getLast(){ ] Hzt b
return lastExecuteTime; L*&p!
} :I+Gu*0WD
public void run(){ xa <UM5eI
long now = System.currentTimeMillis(); n)^i/ nXb'
if ((now - lastExecuteTime) > executeSep) { [8T^@YN
//System.out.print("lastExecuteTime:"+lastExecuteTime); :9QZPsL
//System.out.print(" now:"+now+"\n"); 2zs73:z
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 1Cgso`
lastExecuteTime=now; v^d]~!h
executeUpdate(); CF?1R
} (O.d>
else{ v7iuL6jl
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); a1_GIM0
} AlAY iUw{
} 9}PhN<Gd
} i*/Yz*<
//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 D/vOs[X
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类写好了,下面是在JSP中如下调用。 5N/%v&1
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<% 5hQE4/hH
CountBean cb=new CountBean(); TFkZp e;
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); A
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CountCache.add(cb); (9Ux{@$o[
out.print(CountCache.list.size()+"<br>"); _j< K=){
CountControl c=new CountControl(); G
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c.run(); l'/R&`-n
out.print(CountCache.list.size()+"<br>"); ;/r1}tl+3>
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