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: p7},ymQ|YQ
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CountBean.java 6hcs)X7m
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/* 6/a%%1c1
* CountData.java tm;\m!^X{
* k]4CN
* Created on 2007年1月1日, 下午4:44 &w_8E+YZ
* h\C1:0x{
* To change this template, choose Tools | Options and locate the template under Kd}%%L
* the Source Creation and Management node. Right-click the template and choose -6q7ze{@
* Open. You can then make changes to the template in the Source Editor. (>Sy,
*/ H1evW
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package com.tot.count; Mt4`~`6
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/** zPvTRW~H\
* NR^Z#BU
* @author 5"#xbvRS0H
*/ N,)rrBD
public class CountBean { ~N2 [j
private String countType; p=Qo92
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int countId; q!d7Ms{q
/** Creates a new instance of CountData */ B)DtJf
public CountBean() {} m,J9:S<5;
public void setCountType(String countTypes){ ++kVq$9@y
this.countType=countTypes; J<L"D/
} c*8k _o,
public void setCountId(int countIds){ %H"AHkge:a
this.countId=countIds; N8wA">u
} Kn+B):OY+
public String getCountType(){ *xKY>E+
return countType; V=GP_^F
} 5X`m.lhUc
public int getCountId(){ (Sj?BZjC
return countId; c}7Rt|`c
} =sXk,I;
} k1^&;}/f:
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CountCache.java +_fxV|}P
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/* &ZPyZj
* CountCache.java :2&W9v
* [{-;cpM\
* Created on 2007年1月1日, 下午5:01 ID=^497
* ADZU?7)
* To change this template, choose Tools | Options and locate the template under fH
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* the Source Creation and Management node. Right-click the template and choose XuW>GT/
* Open. You can then make changes to the template in the Source Editor. Xpf:I
*/ SnW>`
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package com.tot.count; ?F%,d{^
import java.util.*; ON3~!Q)
/** X[iQ%Y$/n
* [lAZ)6E~=
* @author @X>Oj .
*/ M,9f}V)
public class CountCache { >BlF<
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public static LinkedList list=new LinkedList(); h-:te9p6>4
/** Creates a new instance of CountCache */ $>PV6
public CountCache() {} K@@[N17/8
public static void add(CountBean cb){ p# (5
;
if(cb!=null){ 4] I7t
list.add(cb); QPpC_pZh
} w57D qG>
} kC-OZ VoO
} =ET |h}I
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CountControl.java b$1W>
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/* A^"( VaK
* CountThread.java e47N 9&4
* 1$ C\`
* Created on 2007年1月1日, 下午4:57 x.~A vJ
* >hmBV7nR
* To change this template, choose Tools | Options and locate the template under T4x%dg
* the Source Creation and Management node. Right-click the template and choose z#elwL6
* Open. You can then make changes to the template in the Source Editor. -}9a%
*/ =5m~rJ<{
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package com.tot.count; 6#/v:;bF
import tot.db.DBUtils;
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import java.sql.*; JQ)w/@Vu=
/** z8\z`#g!
* bs=x>F
* @author w4e(p 3
*/ 3c.,T
public class CountControl{ wXnluE
private static long lastExecuteTime=0;//上次更新时间 WvJidz?5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V*w~Sr%
/** Creates a new instance of CountThread */ L1J~D?q
public CountControl() {} TcM;6h`
public synchronized void executeUpdate(){ + =N#6#1
Connection conn=null; hYS}PE
PreparedStatement ps=null; )D"E]
try{ !m<v@SmL\
conn = DBUtils.getConnection(); Oq3]ZUVa
conn.setAutoCommit(false); osdl dS
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [Y_CRxa\u
for(int i=0;i<CountCache.list.size();i++){ jZ\a:K?
CountBean cb=(CountBean)CountCache.list.getFirst(); \hr2#!
CountCache.list.removeFirst(); `8sC>)lrwu
ps.setInt(1, cb.getCountId()); 2j
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ps.executeUpdate();⑴ +#V.6i
//ps.addBatch();⑵ >`(]&o6<$
} r(VznKSx
//int [] counts = ps.executeBatch();⑶ |`,AAa
conn.commit(); O4.`N?Xq
}catch(Exception e){ A4>j4\A[M
e.printStackTrace(); Z& W*@(dX
} finally{ |b'}.(/3i
try{ &;wNJ)Uc
if(ps!=null) { 'NYW`,
ps.clearParameters(); #l?E2
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ps.close(); ZGZ1Q/WH
ps=null; 6k-
} t#BQB<GI
}catch(SQLException e){} me@xl}
DBUtils.closeConnection(conn); ]u<8jr
} r(6$.zx
} ZD;1{
public long getLast(){ B9h'}460H
return lastExecuteTime; Yw_^]:~
} r&_bk
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public void run(){ >#Ue`)d`aY
long now = System.currentTimeMillis(); tR`^c8gD
if ((now - lastExecuteTime) > executeSep) { &A!?:?3%O
//System.out.print("lastExecuteTime:"+lastExecuteTime); 0wnC"2GUX
//System.out.print(" now:"+now+"\n"); P4{!/&/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6[~_;0
lastExecuteTime=now; /=IBK`
executeUpdate(); /k O
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} p%ZOLoc)Y
else{ !l5&