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: HTAJn_
(w}iEm\b
CountBean.java )[i0~o[
$C#G8Ck,
/* qS:hv&~
* CountData.java 1YL6:5n
* 8c3Qd
* Created on 2007年1月1日, 下午4:44 q#$Al
* A!\g!*
* To change this template, choose Tools | Options and locate the template under LB1LQ0M
* the Source Creation and Management node. Right-click the template and choose hOG9
* Open. You can then make changes to the template in the Source Editor. [@(M%
*/ Bvb.N$G
*]:gEO
package com.tot.count; 9ldv*9v
O`<id+rx
/** G(" S6u
* }rRf4te
* @author @i U@JE`C
*/ %ukFn
&-2@
public class CountBean {
&NM.}f
private String countType; DryN}EMOKD
int countId; MEf`&<t
/** Creates a new instance of CountData */ j51Wod<[
public CountBean() {} >+Z BQ]~
public void setCountType(String countTypes){ FxeDjAP
this.countType=countTypes;
[uqe|< :
} Q8OA{EUtq
public void setCountId(int countIds){ >$Sc}a3
this.countId=countIds; :s DE'o
} 9$U@h7|Q`
public String getCountType(){ TrD2:N}dI
return countType; Er509zZ,[
} D+.<
kY.
public int getCountId(){ &3~lZa;D
return countId; CobMagPhr
} Xfo3fW)s
} Q$u&/g3NvL
mCah{~
CountCache.java n@>h"(@i
5P'o+Vwz
/* WZ,}]D
* CountCache.java Vz_ac
vfk^
* dp;;20z
* Created on 2007年1月1日, 下午5:01 Av6=q=D
* HmlE Cx
* To change this template, choose Tools | Options and locate the template under JWQd/
* the Source Creation and Management node. Right-click the template and choose 5yBaxw`
* Open. You can then make changes to the template in the Source Editor. j=c=Pe"?u
*/ 7m='-_w)?w
"pUqYMB2i
package com.tot.count; xgeDfpF'
import java.util.*; 4u0\|e@a
/** d^b(Uo=$
* z 3((L
* @author TNun)0p
*/ +pMa-{
public class CountCache { V;}kgWc1
public static LinkedList list=new LinkedList(); V}=%/OY?
/** Creates a new instance of CountCache */ T .#cd1b
public CountCache() {} *XN|ZGl/
public static void add(CountBean cb){ [=/Yo1:v
if(cb!=null){ 9NzK1V0X
list.add(cb); _%M+!Ltz
} 6WI-ZEVp&
} ^<u9I5?
} p>x[:*
(h&XtFul}
CountControl.java EY+/
foP
< 7
/* ct o+W}k
* CountThread.java 3QM; K^$
* w2 %u;D%
* Created on 2007年1月1日, 下午4:57 fyHFfPEE
* '?$N.lj$d
* To change this template, choose Tools | Options and locate the template under /w[B,_ZKTk
* the Source Creation and Management node. Right-click the template and choose "&9L
* Open. You can then make changes to the template in the Source Editor. @bfW-\ I
*/ Jr2x`^aNO
Ei$?]~
&
package com.tot.count; $4YyZ!_.@
import tot.db.DBUtils; _T\/kJ)Q\
import java.sql.*; Q5K<ECoPk
/** /xS4>@hn
* MZPXI{G
* @author Xgb ~ED]
*/ sWtT"7>x
public class CountControl{ q!fdiv`
private static long lastExecuteTime=0;//上次更新时间 1VXyn\
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +,8j]<wpo
/** Creates a new instance of CountThread */ b\
P6,s'(
public CountControl() {} FR57F(31
public synchronized void executeUpdate(){ rHSA5.[1P
Connection conn=null; 8VWkUsOoI
PreparedStatement ps=null;
iwiHw
try{ ` @PHV
conn = DBUtils.getConnection(); 40?xu#"
conn.setAutoCommit(false); fS@V`"O6
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); owR`Z`^h)
for(int i=0;i<CountCache.list.size();i++){ Uj/m
CountBean cb=(CountBean)CountCache.list.getFirst(); T{A5,85
CountCache.list.removeFirst(); 27"M]17)
ps.setInt(1, cb.getCountId()); @Yzdq\FI
ps.executeUpdate();⑴ GF^)](xY+
//ps.addBatch();⑵ E`A6GX
} sLHUQ(S!
//int [] counts = ps.executeBatch();⑶ *- S/{
.&
conn.commit(); !<EQVqj6
}catch(Exception e){ pwIu;:O!?
e.printStackTrace(); UgqfO(
} finally{ QXaE2}}P
try{ 3)ZdT{MY
if(ps!=null) { = n>aJ(=Pd
ps.clearParameters(); N'5AU (
ps.close(); @gc|Z]CV
ps=null; j Z6]G{
} B)L=)N
}catch(SQLException e){} &gv{LJd5b
DBUtils.closeConnection(conn); %)t9b@c!}
} Q:v9C ^7
} NT1"?Thx|
public long getLast(){ {p90
return lastExecuteTime; *X%dg$VcV
} bjq+x:>
public void run(){ _x'?igy
long now = System.currentTimeMillis(); U@'F9UB`
if ((now - lastExecuteTime) > executeSep) { 3oo Tn-`{
//System.out.print("lastExecuteTime:"+lastExecuteTime); f+c<