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: 2$Fy?08q
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CountBean.java ;q3"XLV(T[
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/* &4m\``//9
* CountData.java Z2%ySO
* |z5`h
* Created on 2007年1月1日, 下午4:44 O.9r'n4f
* S<-e/`p=H
* To change this template, choose Tools | Options and locate the template under figCeJ!W4
* the Source Creation and Management node. Right-click the template and choose M?3Nh;
* Open. You can then make changes to the template in the Source Editor. >~D-\,d|f
*/ "IvFkS=*Q
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package com.tot.count; )J['0DUrZK
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/** $;1TP|
* FA+'E
* @author ^xpiNP!?a
*/ _xyq25/
public class CountBean { Zeeixg-1<
private String countType; S(c&XJR
int countId; GJ3@".+6
/** Creates a new instance of CountData */ z-Ndv;:
public CountBean() {} ]<zjD%Ez
public void setCountType(String countTypes){ |$)+h\h
this.countType=countTypes; `L. kyL
} pc=f,
public void setCountId(int countIds){ AwC"c '
this.countId=countIds; LXGlG
} +TWk}#G
public String getCountType(){ y1FE +EX[
return countType; LRuB&4r8
} 5V{>
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public int getCountId(){ $z"1&y)
return countId; &F!Ct(c99
} $N[R99*x8
} (9_O||ee
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CountCache.java ISbhC!59
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/* "s6\l~+9l
* CountCache.java &rj)Oh2
* A:?|\r
* Created on 2007年1月1日, 下午5:01 y9#r
SA*
* a@ub%laL
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* To change this template, choose Tools | Options and locate the template under P`HDQ/^O
* the Source Creation and Management node. Right-click the template and choose -D4"uoN.
* Open. You can then make changes to the template in the Source Editor. ;ye5HlH}.
*/ &azy1.i~
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package com.tot.count; lo!.%PP|
import java.util.*; 9CxFj)#5F
/** V/8"@C
* Fr,qVYf
* @author gZ^'hW-{
*/ zo^34wW^
public class CountCache { p1blPBlp
public static LinkedList list=new LinkedList(); |@+/R .l
/** Creates a new instance of CountCache */ S]O0zv^}
public CountCache() {} $BPTk0Y
public static void add(CountBean cb){ @rV|7%u
if(cb!=null){ SdJGhU
list.add(cb); 9 :ubPqt
} kw gsf5[
} KH~o0 W
} k,kr7'Q
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CountControl.java T|L_+(M{
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/* DMc H, _(
* CountThread.java +IM:jrT(
* ],3#[n[ m
* Created on 2007年1月1日, 下午4:57 C;EC4n+s
* ma%PVz`I;9
* To change this template, choose Tools | Options and locate the template under W{v{sQg
* the Source Creation and Management node. Right-click the template and choose s[}4Q|s%
* Open. You can then make changes to the template in the Source Editor. lQ]8PR
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*/ K!\$M BI
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package com.tot.count; }=fVO<Rv
import tot.db.DBUtils; Wt ,t5
import java.sql.*; #AN]mH
/** jk\04k
* NO%x
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* @author ?}tWI7KI
*/ L6ifT`;T
public class CountControl{ z^etH/]Sy
private static long lastExecuteTime=0;//上次更新时间 xeGl}q|
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 'Wv`^{y <^
/** Creates a new instance of CountThread */ ;L{#TC(]J]
public CountControl() {} EW:tb-%`
public synchronized void executeUpdate(){ _>LI[yf{
Connection conn=null; V(5=-8k
PreparedStatement ps=null; |RA|nu
try{ G)S(a4
conn = DBUtils.getConnection(); ayR;|S
conn.setAutoCommit(false); !=f$
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !gKz=-C
for(int i=0;i<CountCache.list.size();i++){ 1\{_bUZ&
CountBean cb=(CountBean)CountCache.list.getFirst(); Bw`7ND}&
CountCache.list.removeFirst(); eM1=r:jgE
ps.setInt(1, cb.getCountId()); &{5v[:$
ps.executeUpdate();⑴ R=ipK63
//ps.addBatch();⑵ 4L`<xX;:{
} nz}}m^-j
//int [] counts = ps.executeBatch();⑶ it\U+xu
conn.commit(); mx ]a@tu
}catch(Exception e){ jO9w7u6
e.printStackTrace(); ku&m)'
} finally{ {f12&t
try{ M<
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if(ps!=null) { DJGq=*
ps.clearParameters(); v
Wt{kg;
ps.close(); @}r2xY1
ps=null; 8e:\T.)M
} _Dv<
}catch(SQLException e){} dm+}nQI\
DBUtils.closeConnection(conn); @#?w>38y
} J: T
} |
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public long getLast(){ *}n)KK7aT
return lastExecuteTime; @S>$y5if
} )dMXn2O
public void run(){ wBb J
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long now = System.currentTimeMillis(); <8SRt-Cr
if ((now - lastExecuteTime) > executeSep) { KVC$o+<'`%
//System.out.print("lastExecuteTime:"+lastExecuteTime); |rhCQ"H
//System.out.print(" now:"+now+"\n"); )=:gO`"D
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8!!iwmH{
lastExecuteTime=now; M.(shIu!+
executeUpdate(); 5IsRIz[`TK
} N)&(&