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: LD~s@}yH>
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CountBean.java NB z3j
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/* x*9CK8o=
* CountData.java dX58nJ4u
* AxN.k
* Created on 2007年1月1日, 下午4:44 ;I#S m;
* {c3u!}mW
* To change this template, choose Tools | Options and locate the template under YJ&K0%R
* the Source Creation and Management node. Right-click the template and choose bYKyR}e
* Open. You can then make changes to the template in the Source Editor. f.o,VVYi
*/ 7sQw&yUL)
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package com.tot.count; \I"UW1)B
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/** 8%$Vj
* Au6*hv3:
* @author 4[ S0~O{r
*/ WG{mg/\2(C
public class CountBean { ]J
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private String countType; xF+a.gAIb
int countId; ;Ly(O'9
/** Creates a new instance of CountData */ Ef1R?<
public CountBean() {} \xH#X=J
public void setCountType(String countTypes){ buXPeIo^VM
this.countType=countTypes; r/![ohrEB
} )m-l&UK
public void setCountId(int countIds){ JYbE(&l%de
this.countId=countIds; 0RLyAC|
} Rv)!p~V8
public String getCountType(){ 6T}bD[h4?
return countType; "rj qDpH
} %r<c>sFJN
public int getCountId(){ [Z5Lgg&
return countId; }+L!r53g6
} +q==Y/z
} wXc"Car)
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CountCache.java 93Yo}6>
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/* 5!55v
* CountCache.java \;?=h
* H(^O{JC]y!
* Created on 2007年1月1日, 下午5:01 rpgr5>
* 5dVSir
* To change this template, choose Tools | Options and locate the template under brkR,(#L3
* the Source Creation and Management node. Right-click the template and choose 0,T'z,
* Open. You can then make changes to the template in the Source Editor. |EJ&s393&
*/ ?Jlz{ms I
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package com.tot.count; &=sVq^d@qe
import java.util.*; IeqJ>t:
/** qNhQ2x\
* 959i2z
* @author )
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*/ |k wkikGQS
public class CountCache { DR o@gYDn
public static LinkedList list=new LinkedList(); y&0&K4aa
/** Creates a new instance of CountCache */ uA?_\z?
public CountCache() {} 8 oHyNo
public static void add(CountBean cb){ \(a9rZ9
if(cb!=null){ cJ
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list.add(cb); g<[_h(xDeG
} G\\zk
} ];waK2'2
} .(Gq9m[~8H
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CountControl.java J~5VL |ca
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/* gY],
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* CountThread.java B)F2SK<@
* +w-UK[p
* Created on 2007年1月1日, 下午4:57 -R,[/7zj
* 8c m,G
* To change this template, choose Tools | Options and locate the template under OCzWP,
* the Source Creation and Management node. Right-click the template and choose &(fB+VNrOH
* Open. You can then make changes to the template in the Source Editor. .,:700n+^
*/ Mj&f7IUO
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package com.tot.count; [_jTy;E
import tot.db.DBUtils; _C v({m&N
import java.sql.*; %C=
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/** wSp1ChS k
* J9oGwP
* @author f[n#Eu}
*/ ,.`";='o
public class CountControl{ WV5gH*uUa
private static long lastExecuteTime=0;//上次更新时间 ex8mA6g
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 =|n NC
/** Creates a new instance of CountThread */ DT # 1*&-
public CountControl() {} VVdgNT|}W
public synchronized void executeUpdate(){ W"fdK_F\
Connection conn=null; )-824?Nl:
PreparedStatement ps=null; NIDK:qdR
try{ +[9~ta|j
conn = DBUtils.getConnection(); H&65X
conn.setAutoCommit(false); . `lcxC
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (=${@=!z
for(int i=0;i<CountCache.list.size();i++){ t;9f7~
CountBean cb=(CountBean)CountCache.list.getFirst(); ,TD@s$2x
CountCache.list.removeFirst(); ^f{+p*i}:
ps.setInt(1, cb.getCountId()); uXuMt
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ps.executeUpdate();⑴ vN%zk(?T
//ps.addBatch();⑵ WlVC0&
} [3s,U4a
//int [] counts = ps.executeBatch();⑶ o}p6qB=;1
conn.commit(); x%ZjGDF m
}catch(Exception e){ 7-+X -Y?
e.printStackTrace(); 8#S|jBV
} finally{ }io9Hk>|
try{ !`vm7FN"u
if(ps!=null) { vBd^=O
ps.clearParameters(); MpM-xz~
ps.close(); -IJt( X|
ps=null; +nRO<
} x+(h#+F
}catch(SQLException e){} Z>Nr"7k
DBUtils.closeConnection(conn); $%VFk 53I
} JoA^9AYhR
} =^4 vz=2
public long getLast(){ )'M<q,@<(
return lastExecuteTime; mFOuE5
} <tAn2e!
public void run(){ 7Xv.C&jzd
long now = System.currentTimeMillis(); AFL* a*
if ((now - lastExecuteTime) > executeSep) { qgw:Q
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5aw#!K=J'
//System.out.print(" now:"+now+"\n"); +Ij>\;vM"
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 02&m