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: !AGjiP$
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CountBean.java 4X5Tyv(Dp
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/* @%5$x]^
* CountData.java }gr6naz
* >**7ck
* Created on 2007年1月1日, 下午4:44 -0{"QhdE%
* )^C w
* To change this template, choose Tools | Options and locate the template under ^j1WF[GiSO
* the Source Creation and Management node. Right-click the template and choose 6IVa(;
* Open. You can then make changes to the template in the Source Editor. Y`x54_32
*/ D\Nhq Vw
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package com.tot.count; v/Z!Wp1LV
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/** j0LA
* G%V*+Ond
* @author S$Cht6m
*/ 3r)<:4a
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public class CountBean { {bSi3 oI
private String countType; jNIZ!/K
int countId; whzV7RT
/** Creates a new instance of CountData */ Ny.s
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public CountBean() {} pV3o\bk!
public void setCountType(String countTypes){ j^g^=uau
this.countType=countTypes; },2mIit(
} d +]Gw
public void setCountId(int countIds){ B^z3u=ll
this.countId=countIds; er0hf2N]
} k_2W*2'S
public String getCountType(){ M=57 d7
return countType; .[Z<r>
} GTw3rD^wg
public int getCountId(){ drJ<&1O
return countId; U-P\F-
} @y (9LSs
} FE)L?
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CountCache.java nJ.<yrzi
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/* }NQ{S3JW
* CountCache.java @bN`+DC!<
* $6ZO
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* Created on 2007年1月1日, 下午5:01 .}}w@NO
* Ol,Tw=?
* To change this template, choose Tools | Options and locate the template under 2qb,bp1$
* the Source Creation and Management node. Right-click the template and choose 9`/\|t|V
* Open. You can then make changes to the template in the Source Editor. 5z8!Nmb/
*/ }*2q7K2bj
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package com.tot.count; CvwC| AW
import java.util.*; `YDe<@6'
/** xZ*.@Pkr
* >f [Lb|t
* @author Zhl}X!:c?\
*/ -?A,N,nnX
public class CountCache { MY zyg
public static LinkedList list=new LinkedList(); k{/2vV[`]
/** Creates a new instance of CountCache */ 4uW}.7R'
public CountCache() {} V@0Z\&
public static void add(CountBean cb){ Z|YiYQl[)
if(cb!=null){ 7b,5*]oZ
list.add(cb); s
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} GW_@hYIqD
} 0ciPH:V
} ]j.??'+rg
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CountControl.java *&b~cyC
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/* o}XbFLn
* CountThread.java
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* #>m#i1Nu
* Created on 2007年1月1日, 下午4:57 U"} ml
* 26fbBt8nP
* To change this template, choose Tools | Options and locate the template under 3,@I`
M
* the Source Creation and Management node. Right-click the template and choose 5*=a*nD11
* Open. You can then make changes to the template in the Source Editor. %Lec\(-4L
*/ 6{rH|Z
#!wL0p
package com.tot.count; A^PCI*SN[
import tot.db.DBUtils; T&_!AjH
import java.sql.*; BJgg-z{Y
/** |fXwH> 'sw
* -G<$wh9~3
* @author p)d0ZAs
*/ V j\1HQ
public class CountControl{ {'W\~GnZ
private static long lastExecuteTime=0;//上次更新时间 ='1J&w~7
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 =]h 5RC
/** Creates a new instance of CountThread */ "]}+QK_
public CountControl() {} xU/Eu;m
public synchronized void executeUpdate(){ Hcw@24ic
Connection conn=null; yM%,*VZ
PreparedStatement ps=null; "^j&
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try{ ;H5H7ezV
conn = DBUtils.getConnection(); !br0s(|
conn.setAutoCommit(false); r40#-A$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &P>wIbE
for(int i=0;i<CountCache.list.size();i++){ jq{rNxdGx
CountBean cb=(CountBean)CountCache.list.getFirst(); .d:sQ\k~=
CountCache.list.removeFirst(); e-;$Iv
ps.setInt(1, cb.getCountId()); WDr'w'
ps.executeUpdate();⑴ yZ t}Jnv
//ps.addBatch();⑵ 0Y#S2ty
} xXl^\?HC
//int [] counts = ps.executeBatch();⑶ f $MVgX
conn.commit(); +:4J~Cuf
}catch(Exception e){ [xT2c.2__J
e.printStackTrace(); 24_F`" :-=
} finally{ \HFeEEKH
try{ *
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if(ps!=null) { 0eY$K7
U
ps.clearParameters(); 0R~{|RHM
ps.close(); EJ P##eGx
ps=null; YC\~PVG
} $FEG0&
}catch(SQLException e){} nfck3h
DBUtils.closeConnection(conn); d_BO&k