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: H UJqB0D
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CountBean.java QW..=}pL
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/* =B&|\2`{)
* CountData.java l@Lk+-[D
* GtRpgM
* Created on 2007年1月1日, 下午4:44 DLwlA!z
* `(W"wC
* To change this template, choose Tools | Options and locate the template under St;9&A
* the Source Creation and Management node. Right-click the template and choose G>~/
* Open. You can then make changes to the template in the Source Editor. [_N1
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*/ -=-^rQx9
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package com.tot.count; ^%oH LsY9
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/** h!B{7J
* qMaO1cE\
* @author AyJl:aN^
*/ x]VycS
public class CountBean { +5fB?0D;
private String countType; n3e,vP? R
int countId; DzC`yWstP
/** Creates a new instance of CountData */ ~'*23]j
public CountBean() {} zBm~ J%
public void setCountType(String countTypes){ S1k*"><
this.countType=countTypes; Iq|h1ie
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} ]n=z(2Z9lD
public void setCountId(int countIds){ 2tU3p<[
this.countId=countIds; MdX4Rp'
} kr$)nf
public String getCountType(){ #h ud_
return countType; GS*O{u
} !fs ~ >
public int getCountId(){ {F_>cyR
return countId; w !kk(QMV
} l|842N@1
} 3SM'vV0[
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CountCache.java .0nT*LF
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/* QAI=nrlp
* CountCache.java !/`AM<`o
* @3eMvbI
* Created on 2007年1月1日, 下午5:01 qY&(O`?m&
* t<`wK8)
* To change this template, choose Tools | Options and locate the template under QVn2`hr
* the Source Creation and Management node. Right-click the template and choose F_u?.6e]
* Open. You can then make changes to the template in the Source Editor. vkLt#yj~
*/ H94_a e
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package com.tot.count; VK9E{~0=
import java.util.*; !'\(OFv9Im
/** 2SC'Z>A
* r<]^.]3zj
* @author depCqz@
*/ c[1{>z{G
public class CountCache { CLD*\)QD\
public static LinkedList list=new LinkedList(); akQtre`5sd
/** Creates a new instance of CountCache */ VL<)d-
public CountCache() {} Pz +8u&~p
public static void add(CountBean cb){ jX{lo
if(cb!=null){ 18!0Hl>
list.add(cb); 9W7H",wR
} Tr}c]IP*
} o0Hh&:6!M
} G\IH
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CountControl.java Nr7MSFiL
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/* FUm-Fp
* CountThread.java F:M3^I
* v *~ yN*
* Created on 2007年1月1日, 下午4:57 ~GS`@IU}
* Md[nlz
* To change this template, choose Tools | Options and locate the template under c{#lKD<7
* the Source Creation and Management node. Right-click the template and choose YrgwR
* Open. You can then make changes to the template in the Source Editor. 9!FV.yp%F
*/ GI7CZ
}`
package com.tot.count; 8F4#E
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import tot.db.DBUtils; H,=??wN
import java.sql.*; 2&!G@5
/** ,)Z^b$H]
* oc-7gz)
* @author BbiBtU
*/ y)#Ib*?
public class CountControl{ !Nl"y'B|
private static long lastExecuteTime=0;//上次更新时间 fwxyZBr
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 NCSb`SC:
/** Creates a new instance of CountThread */ E9226
public CountControl() {} G*wn[o(^j
public synchronized void executeUpdate(){ OBN]bvCJ
Connection conn=null; }(TZ}* d
PreparedStatement ps=null; }
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try{
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conn = DBUtils.getConnection(); <h7C_^L10\
conn.setAutoCommit(false); )X| uOg&|
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /1tqTi
for(int i=0;i<CountCache.list.size();i++){ rmR7^Ycv/
CountBean cb=(CountBean)CountCache.list.getFirst(); WZ~rsSZSV
CountCache.list.removeFirst(); O2Rv^la
ps.setInt(1, cb.getCountId()); {n%F^ky+7
ps.executeUpdate();⑴ le|e 4f*+
//ps.addBatch();⑵ N9:xtrJ]_J
} O&\;BF5:R
//int [] counts = ps.executeBatch();⑶ ga~rllm;i
conn.commit(); #xE"];
}catch(Exception e){ 0xC{Lf&
e.printStackTrace(); ,n~H]66n
} finally{ =}U`q3k
try{ 01#a
if(ps!=null) { `;4zIBJ
ps.clearParameters(); H-0A&oG
ps.close(); Eh0R0;l5>
ps=null; w]F (o
} QSEf
}catch(SQLException e){} oXV
DBUtils.closeConnection(conn); E@P8-x'i
} AVi
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} +vBq,'k`
public long getLast(){ +:wOzTUN
return lastExecuteTime; Z]":xl\7
} 4 K{4=uU
public void run(){ ~0t]`<y=
long now = System.currentTimeMillis(); ^0A'XCULG
if ((now - lastExecuteTime) > executeSep) { x(5>f9b b
//System.out.print("lastExecuteTime:"+lastExecuteTime); #U(dleT8
//System.out.print(" now:"+now+"\n"); Iz!Blk
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ?7/n s>}
lastExecuteTime=now; lySeq^y?Q
executeUpdate(); q%"]}@a0
} hf8=r5j=
else{ mn?<
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); r2qxi'
} 9] Uvy|
} NHPpHY3^.
} rH$0h2
//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 %#yCp2
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类写好了,下面是在JSP中如下调用。 6*/0 yGij
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