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: lMv6QL\>'
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CountBean.java (Mc{nFqS
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/* Tv%7=P;r
* CountData.java |Iy;_8c
* ]&D dy&V
* Created on 2007年1月1日, 下午4:44 "rdpA[>L
* *r.%/^@
* To change this template, choose Tools | Options and locate the template under :6n4i$
* the Source Creation and Management node. Right-click the template and choose [I;C6p
* Open. You can then make changes to the template in the Source Editor. _'p/8K5)=
*/ <Zva
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package com.tot.count; 'IU3Xu[-.
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/** lhM5a
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* @tT`s^e
* @author S{llpp{E
*/ mJ%^`mrI
public class CountBean { 4(8c L?J`0
private String countType; .1(_7!m@
int countId; Sr+hB>{
/** Creates a new instance of CountData */ HOi~eX1d
public CountBean() {} taDe^Istj
public void setCountType(String countTypes){ #x 6/"Y2
this.countType=countTypes; ybpOk
} \: ZDY(>1
public void setCountId(int countIds){ Zx8$M5
this.countId=countIds; we}xGb.u
} D)MFii1J~
public String getCountType(){ 0}GO$%l
return countType; cO:lpsKYQ
} Av.`'.b
public int getCountId(){ F]RPM(!5O)
return countId; G/
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} IFW(nB(
} y/@Bhzc
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CountCache.java yR5XcPoKI
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/* 42e [OG-
* CountCache.java wmpQF<
* uj;iE
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* Created on 2007年1月1日, 下午5:01 #@nPB.
* A}! A*z<9
* To change this template, choose Tools | Options and locate the template under #0)TS
* the Source Creation and Management node. Right-click the template and choose I!b"Rv=Nf-
* Open. You can then make changes to the template in the Source Editor. <e&v[
*/ R;,5LS&*a
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package com.tot.count; uv5NqL&
import java.util.*; 5xT, O
/** i=5!taxu}E
* mR2"dq;U
* @author 'RwfW|~6
*/ [cFD\"gJAr
public class CountCache { ;=2JbA+"G
public static LinkedList list=new LinkedList(); _R0O9sPTO
/** Creates a new instance of CountCache */ !C4)P3k
public CountCache() {} 4]}d'x&
public static void add(CountBean cb){ &n]v
if(cb!=null){ "#36-
list.add(cb); ^0"fPG`
} Vh01y f
} C-_u`|jQ
} QP"5A7=m
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CountControl.java )EYs+7/t
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/* %/)z!}{
* CountThread.java XiV*d06{
* ']Czn._
* Created on 2007年1月1日, 下午4:57 H [M:iV
* vh|m[ p
* To change this template, choose Tools | Options and locate the template under .: wg@Z
* the Source Creation and Management node. Right-click the template and choose /=V!lRs
* Open. You can then make changes to the template in the Source Editor. <`q-#-V@
*/ }<z[t5
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package com.tot.count; 3Zz_wr6
import tot.db.DBUtils; od@!WjcM[8
import java.sql.*; a@_n>$LZL
/** ?y%Mm09
* 8eCh5*_$
* @author e2xKo1?I
*/ _x-2tnIxXv
public class CountControl{ 'D[ *|Qcy
private static long lastExecuteTime=0;//上次更新时间 ~urk
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 *Qngx
/** Creates a new instance of CountThread */ ?iaO+G&|
public CountControl() {} l7WZ" 6d
public synchronized void executeUpdate(){ / H GPy
Connection conn=null; yp
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PreparedStatement ps=null; %h_N%B$7c1
try{ u#ocx[
conn = DBUtils.getConnection(); ;M+~e~
conn.setAutoCommit(false); #pD=TMefC
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1mv5B t
for(int i=0;i<CountCache.list.size();i++){ ju.`c->k"
CountBean cb=(CountBean)CountCache.list.getFirst(); 5:~ zlg
CountCache.list.removeFirst(); [8b{Ybaz
ps.setInt(1, cb.getCountId()); 98|1K>C
ps.executeUpdate();⑴ 80U(q/H%9
//ps.addBatch();⑵ b^~4 k; <
} rv~OfL
//int [] counts = ps.executeBatch();⑶ >'3nsR
conn.commit(); >)`*:_{
}catch(Exception e){ vQ5rhRG)E
e.printStackTrace(); xM&`>`;^e
} finally{
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try{ sEa| 2$
if(ps!=null) { w!UIz[ajI
ps.clearParameters(); j3o?B
ps.close(); Fp+fZU
ps=null; @Y%i`}T%(
} m*AiP]Qu
}catch(SQLException e){} oPxh+|0?
DBUtils.closeConnection(conn); LD;!
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} q' t"
} %pxHGO=)E
public long getLast(){ W
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return lastExecuteTime; s8*Q@0
} ()_^:WQO?
public void run(){ +W|VCz
long now = System.currentTimeMillis(); Gbb*p+(
if ((now - lastExecuteTime) > executeSep) { xy^z_`
//System.out.print("lastExecuteTime:"+lastExecuteTime); <a(739IF
//System.out.print(" now:"+now+"\n"); e1H2w?
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); iT~ gt/K
lastExecuteTime=now; na|23jz4
executeUpdate(); `9DW}
} ;C5
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else{ )5<c8lzp
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); AR)A <