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: _F;v3|`D@<
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CountBean.java Rqh5FzB>
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/* 4N,mcV
* CountData.java EO&Q
* "]+g5G
* Created on 2007年1月1日, 下午4:44 *|fF;-#v
* +(3_V$|Dv
* To change this template, choose Tools | Options and locate the template under ::|~tLFu
* the Source Creation and Management node. Right-click the template and choose qz-QVY,
* Open. You can then make changes to the template in the Source Editor. "?I#!t%'
*/ /o;M
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package com.tot.count; j~Aq-8R=
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/** w7V\_^&Id
* #X}HF $t{=
* @author sS>b}u+v#!
*/ P=QxfX0B
public class CountBean {
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private String countType; %=`JWLLG
int countId; /,Xl8<~#
/** Creates a new instance of CountData */ Hc)z:x;Sj
public CountBean() {} {{?g%mQ6
public void setCountType(String countTypes){
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this.countType=countTypes; HC%Hbc~S_Q
} .A2$C|a*
public void setCountId(int countIds){ ,@`?I6nKy
this.countId=countIds; Ttluh
*
} 8D='N`cN+
public String getCountType(){ fE-R(9K
return countType; k6(7G@@}
}
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public int getCountId(){ :
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return countId; g^'h4qOa
} +1ICX
} <+roY"
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CountCache.java *NmY]
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/* I\~[GsDY
* CountCache.java WAa45G
* utlr|m Xc
* Created on 2007年1月1日, 下午5:01 53HA6:Q[
* !_S#8"
* To change this template, choose Tools | Options and locate the template under ~||0lj.D
* the Source Creation and Management node. Right-click the template and choose 6hxZ5&;(*
* Open. You can then make changes to the template in the Source Editor. a+w2cN'
*/ v/+ <YU
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package com.tot.count; z5E%*]
import java.util.*; (Rw<1q`,
/** KGz Nj%
* 1/.BP
* @author Bm$|XS3cD
*/ l4bytI{63
public class CountCache { DXs an
public static LinkedList list=new LinkedList(); :<QknU}dwy
/** Creates a new instance of CountCache */ d*@T30
public CountCache() {} e97G]XLR
public static void add(CountBean cb){ Eb8pM>'qM
if(cb!=null){ //R"ZE@d\
list.add(cb); 8 #_pkVQw:
} |R`"Zu`
} M3(N!xT
} fF@w:;u
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CountControl.java Bn}woyJdx
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/* a>wCBkD
* CountThread.java Ep7MU&O0iK
* 6 d-\+t8
* Created on 2007年1月1日, 下午4:57 ov6xa*'a
* sy: xA w
* To change this template, choose Tools | Options and locate the template under 4Yj1Etq.E
* the Source Creation and Management node. Right-click the template and choose .ZTvOm'mB^
* Open. You can then make changes to the template in the Source Editor. Ez3fL&*
*/ z$~x 2<
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package com.tot.count; xye-Z\-t
import tot.db.DBUtils;
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import java.sql.*; '!HTE`Aj
/** po| Ux`u
* ` 2lS@
* @author n6/Ous
*/ WyN
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public class CountControl{
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private static long lastExecuteTime=0;//上次更新时间 kp m;ohd
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 >Bt82ibN
/** Creates a new instance of CountThread */ XkaREE
public CountControl() {} NkZG
public synchronized void executeUpdate(){ bZqTT~'T
Connection conn=null; J=g)rd[`
PreparedStatement ps=null; =RoG?gd{R
try{ eV9U+]C`
conn = DBUtils.getConnection(); pv_o4qEN
conn.setAutoCommit(false); -`O{iHfM|P
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); f1 ;
for(int i=0;i<CountCache.list.size();i++){ %w`d
CountBean cb=(CountBean)CountCache.list.getFirst(); m'o dVZ7
CountCache.list.removeFirst(); .wfydu)3
ps.setInt(1, cb.getCountId()); CMt<oT6.?
ps.executeUpdate();⑴ $O"ss>8Se
//ps.addBatch();⑵ /9`4f "
} "Xq_N4
//int [] counts = ps.executeBatch();⑶ }w0pi
conn.commit(); r&gvP|W%
}catch(Exception e){ kSAVFzUS
e.printStackTrace(); XiUq#84Q
} finally{ UP~28%>X
try{ `m,4#P-kj
if(ps!=null) { [!'+}
ps.clearParameters(); 6Yu:v
ps.close(); YpZB-9Krf
ps=null; 1"h"(dA
} Jw)JV~/0
}catch(SQLException e){} q m3\)9C
DBUtils.closeConnection(conn); b1&