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: AihL>a%
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CountBean.java ATMogxh
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/* ]JqkC4|
* CountData.java Bp$+ F/
* t=E|RYC(k
* Created on 2007年1月1日, 下午4:44 !CVBG*E^l
* D_
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* To change this template, choose Tools | Options and locate the template under O%fp;Y{`
* the Source Creation and Management node. Right-click the template and choose |$SvD2^
* Open. You can then make changes to the template in the Source Editor. 8}pcanPg
*/ ?5r2j3mqgv
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package com.tot.count; \:q e3Q
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/** t6h`WAZV
* %!HnGwv-
* @author SILvqm
*/ Ip7FD9
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public class CountBean { ;}>g1&q
private String countType; HgSmAziv
int countId; >Xh(`^}SQ*
/** Creates a new instance of CountData */ )- 6s7
public CountBean() {} '4^V4i
public void setCountType(String countTypes){ _;J9q}X
this.countType=countTypes; a7v[l04
} lM|WOmD
public void setCountId(int countIds){ @7HOL-i
this.countId=countIds; +/b4@B7
} {YKMQI^O/
public String getCountType(){ \9|]
return countType; {Hp}F!X$
} NBg>i7KQ
public int getCountId(){ -t~B@%
return countId; ![P(B0Ct/
} ~0^,L3M
} LA=>g/+i.X
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CountCache.java {Y*]Qc
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/*
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* CountCache.java uVuToMCp
* -o!,,XYj .
* Created on 2007年1月1日, 下午5:01 ]}l+ !NV<
* D
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* To change this template, choose Tools | Options and locate the template under @;T#+!
* the Source Creation and Management node. Right-click the template and choose U:P3Z3Y%
* Open. You can then make changes to the template in the Source Editor. d-N"m I-
*/ gh #w%g1g
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package com.tot.count; z$BnEd.y=:
import java.util.*; NKUI! [
/** $vGEY7,
* iq^L~RW5e
* @author !^w\$cw&
*/ 18/@:u{
public class CountCache { M(h H#_$
public static LinkedList list=new LinkedList(); ;\*Od?1
/** Creates a new instance of CountCache */ ,@>rubUz
public CountCache() {} f`9rTc
public static void add(CountBean cb){ -SY:qG3?
if(cb!=null){ |nH0~P#!
list.add(cb); #c)Ou!Ldb
} j3[OY
} @`y?\fWh
} gJGBD9wC
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CountControl.java *r?51*J
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/* Obc3^pV&
* CountThread.java Ae_ E;[mj
* ;gW|qb+#)j
* Created on 2007年1月1日, 下午4:57 FTYLMQ
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* LjQ1ar\
* To change this template, choose Tools | Options and locate the template under +81+4{*
* the Source Creation and Management node. Right-click the template and choose g/X=#!
* Open. You can then make changes to the template in the Source Editor. 33KPo0g7
*/ h'y@M+c(
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package com.tot.count; wIR[2&b
import tot.db.DBUtils; "xc*A&Sg
import java.sql.*; gAUQQ
/**
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* 645C]l
* @author ]>4Qs
*/ (Nlm4*{h
public class CountControl{ !zkEh9G
private static long lastExecuteTime=0;//上次更新时间 F+$@3[Q`N
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 @[b:([
/** Creates a new instance of CountThread */ ty< tv|p
public CountControl() {} lPN< rgg
public synchronized void executeUpdate(){ }.$B1%2
Connection conn=null; Lr\ B
PreparedStatement ps=null; o>A%}YU
try{ !g&B)0u]*
conn = DBUtils.getConnection(); Y&Lk4
conn.setAutoCommit(false); [;#.DH]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); %^%-h}1
for(int i=0;i<CountCache.list.size();i++){ g+/U^JIc4l
CountBean cb=(CountBean)CountCache.list.getFirst(); GN;XB b]w
CountCache.list.removeFirst(); =i5:*J
ps.setInt(1, cb.getCountId()); >hL'#;:f#
ps.executeUpdate();⑴ F Hcqu_;J
//ps.addBatch();⑵ .x$T al
} z57papo
//int [] counts = ps.executeBatch();⑶ v8k^=A:
conn.commit(); *4^]?Y\*
}catch(Exception e){ BG8)bhk;/
e.printStackTrace(); 0o=)&%G
} finally{ Z%9^6kdY
try{ lg
if(ps!=null) { +95dz?~
ps.clearParameters(); }7z+
ps.close(); $)7f%II
ps=null; z+D,:!yF
} s]%!
}catch(SQLException e){} I2lZ>3X{
DBUtils.closeConnection(conn); P~ZV:Of
} ~ kJpB t7M
} Lpbn@y26<
public long getLast(){ RMt vEa
return lastExecuteTime; _vLT!y
} Q0; gF?
public void run(){ 4$2T zJE
long now = System.currentTimeMillis(); !cq|g
if ((now - lastExecuteTime) > executeSep) { coVT+we
//System.out.print("lastExecuteTime:"+lastExecuteTime); M)pi)$&c
//System.out.print(" now:"+now+"\n"); BBJ]>lQ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %` [`I>
lastExecuteTime=now; EF=D}"E6pO
executeUpdate(); :RO:k|g
} ?E_p ,#9j)
else{ RTY4%6]O
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 7%!KAtc
} hPpXB:(-0
} ;k%sKVP
} HPdwx
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 y8S6ZtA}2
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类写好了,下面是在JSP中如下调用。 =pOY+S|
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<% KR(ftG'
CountBean cb=new CountBean(); d>98 E9
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); BF[?* b
CountCache.add(cb); S|4/C
out.print(CountCache.list.size()+"<br>"); ~%K(ou=2
CountControl c=new CountControl(); % P)}(e6y
c.run(); #=#$b _6*
out.print(CountCache.list.size()+"<br>"); gpvj'Ri7V
%>