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: ]q 3.^F
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CountBean.java &/-}`hIAT
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/* j},3@TFh
* CountData.java <^Jdl.G
* "*ww>0[
* Created on 2007年1月1日, 下午4:44 ;_p!20.(
* b>L?0p$ej
* To change this template, choose Tools | Options and locate the template under K aNO&%qX
* the Source Creation and Management node. Right-click the template and choose 5odXT *n
* Open. You can then make changes to the template in the Source Editor. G]O5irsV
*/ yVgHu#?PM
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package com.tot.count; lYhC2f
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/** 5Tq*]ZE
* J(w 3A)(
* @author (ty&$
*/ W(Rp@=!C
public class CountBean { C{OkbE"Vym
private String countType; QVo>Uit
int countId; '+7"dHLC;
/** Creates a new instance of CountData */ .:~E.b
public CountBean() {} PP8627uP
public void setCountType(String countTypes){ kbZpi`w
this.countType=countTypes; BRXDE7vw
} $+$4W\-=X
public void setCountId(int countIds){ cc 0Tb
this.countId=countIds; o2!wz8
} Ty} Y/jW
public String getCountType(){ DGNn#DP
return countType; __}ut+H^5p
} yX/{eX5dr
public int getCountId(){ z0@BBXQ`
return countId; `RXlqj#u
} 7MQh,J!"
} ojc.ykP$
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CountCache.java OAf}\
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/* ik1asj1
* CountCache.java !6,rN_a@Y
* wV-9T*QrM
* Created on 2007年1月1日, 下午5:01 2S-f5&o
* AkCy
C1
* To change this template, choose Tools | Options and locate the template under 3!{Tw6A8(
* the Source Creation and Management node. Right-click the template and choose ,0{x-S0jX<
* Open. You can then make changes to the template in the Source Editor. hbEqb{#}@
*/ 88l1g,`**
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package com.tot.count; FmSE]et
import java.util.*; @0(%ayi2Y
/** ~F%sO'4!
* dh9@3. t
* @author Gn<0Fy2
*/ r+k&W
public class CountCache { t~<HFY*w
public static LinkedList list=new LinkedList(); -ijzo%&qA
/** Creates a new instance of CountCache */ m^
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public CountCache() {} Kg`P@
public static void add(CountBean cb){ 9WI5\`*"
if(cb!=null){ X *EseC
list.add(cb); %J Jp/I
} q" EW*k+
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} uQ|LkL%<^
} F{^\vFp
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CountControl.java T?RN} @D
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/* Y% JE})
* CountThread.java g/}d> 6
* &xA>(|a\&-
* Created on 2007年1月1日, 下午4:57 ay|jq"a
* &nwS7n1eb
* To change this template, choose Tools | Options and locate the template under ;K~=? k
* the Source Creation and Management node. Right-click the template and choose Pm%5c\ef
* Open. You can then make changes to the template in the Source Editor.
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*/ QO0@Ax\b
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package com.tot.count; w,up`W7,
import tot.db.DBUtils; Ijap%l1I
import java.sql.*; (EvYrm4
/** :J_UXtx
* DBG0)=SHy
* @author kvuRT`/
*/ yf!7
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public class CountControl{ zyO=x4U8
private static long lastExecuteTime=0;//上次更新时间 FPkk\[EU
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 *C0a,G4
/** Creates a new instance of CountThread */ .c&&@>m@.
public CountControl() {} {&XTa`C
public synchronized void executeUpdate(){ GyMN;|
Connection conn=null; l1|*(%p?X
PreparedStatement ps=null; CM$&XJzva
try{ kZo#Ny
conn = DBUtils.getConnection(); uF1 4;
conn.setAutoCommit(false); Z,SV9
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 4n@>gW
for(int i=0;i<CountCache.list.size();i++){ mtkZF{3Jx
CountBean cb=(CountBean)CountCache.list.getFirst(); GF9[|).
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CountCache.list.removeFirst(); V= p"1!(
ps.setInt(1, cb.getCountId()); tu"-]^
ps.executeUpdate();⑴ 4H;7GNu
//ps.addBatch();⑵ ]
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}
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//int [] counts = ps.executeBatch();⑶ H ?9Bo!
conn.commit(); !/tV}.*
}catch(Exception e){ r7>FH!=:
e.printStackTrace(); n0gjcDHQ
} finally{ 0^Vw^]w
try{ 74:( -vS
if(ps!=null) { b;d7mh4
ps.clearParameters(); f*rub. y
ps.close(); pfIK9>i
ps=null; 1%vE 7a>{
} =liyd74%`
}catch(SQLException e){} CQ<