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: 3A5:D#
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CountBean.java ~GZpAPg*
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/* ~'aK[3
* CountData.java :P1/kYg
* !tL&Ktoj
* Created on 2007年1月1日, 下午4:44 ehCZhi~
* UAi] hUq
* To change this template, choose Tools | Options and locate the template under 540,A,>:tb
* the Source Creation and Management node. Right-click the template and choose |N/Wu9w$
* Open. You can then make changes to the template in the Source Editor. v%6mH6V
*/ :n t\uwh
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package com.tot.count; hy?e?^
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/** E:C-k^/[Y
* lq%6~va
* @author gvx
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*/ GE0,d
public class CountBean { etHkyF
private String countType; JIobs*e0m
int countId; x\m?* 5p
/** Creates a new instance of CountData */ r-+S^mOE]
public CountBean() {} 9/x_p;bI
public void setCountType(String countTypes){ N=X(G(
this.countType=countTypes; eGJ}';O,g
} W7ffdODb
public void setCountId(int countIds){ 7<ZCeM2x
this.countId=countIds; ;0!rq^JG
} {_{&t>s2
public String getCountType(){ ~
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return countType; !U2Wiks
} "uthFE
public int getCountId(){ z]Jpvw`p
return countId; #*|0WaC
} vid(^2+
} kj4t![o+
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CountCache.java M9aVE)*!I
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/* %!;6h^@
* CountCache.java w[V71Iej
* b&$sY!iU
* Created on 2007年1月1日, 下午5:01 GG@&jcp7
* *7yu&a8
* To change this template, choose Tools | Options and locate the template under JZS#Q\JN
* the Source Creation and Management node. Right-click the template and choose %`~?w'
* Open. You can then make changes to the template in the Source Editor. HSR^R
*/ aybfBC
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package com.tot.count; =H\ig%%E@
import java.util.*; =!RlU)w
/** Apfs&{Uy
* Qs^RhF\d
* @author sP+ZE>7
*/ #el i_Cxe
public class CountCache { -brn&1oJ
public static LinkedList list=new LinkedList(); F9SkEf]99
/** Creates a new instance of CountCache */ mJ3|UClPS
public CountCache() {} <CJ`A5N
public static void add(CountBean cb){ sBo|e]m#
if(cb!=null){ w53+k\.
list.add(cb); '*PJ-=G
} *&\fBi]
} #)r
} {J}Zv5
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CountControl.java UUF;Q0X
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/* ;6?VkF
* CountThread.java \R0&*cnmo
* a_pNFe
* Created on 2007年1月1日, 下午4:57 9Xu
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* *{y/ wgX
* To change this template, choose Tools | Options and locate the template under >J \} &!8,
* the Source Creation and Management node. Right-click the template and choose `XJU$c
* Open. You can then make changes to the template in the Source Editor. r3hUa4^97
*/ -]?F
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package com.tot.count; ft"B,
import tot.db.DBUtils; ftqi >^i
import java.sql.*; 2bB&/Uumsd
/** wV9[Jl\Z
* Hz&.]yts2J
* @author 2JV,AZf
*/ 6S~lgH:
public class CountControl{ U# jbii6e
private static long lastExecuteTime=0;//上次更新时间 d`_X$P4y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 42Gv]X
/** Creates a new instance of CountThread */ "t{|e6
public CountControl() {} fgg;WXcT ~
public synchronized void executeUpdate(){ -<'&"-
Connection conn=null; >4zH\T!
PreparedStatement ps=null; #_,
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try{ $YmD;
conn = DBUtils.getConnection(); >q:0w{.TU
conn.setAutoCommit(false); RK*ZlD<
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); dh~+0FZ{A
for(int i=0;i<CountCache.list.size();i++){ tWNz:V
CountBean cb=(CountBean)CountCache.list.getFirst(); !]W}I
CountCache.list.removeFirst(); 5jpb`Axj#
ps.setInt(1, cb.getCountId()); *:q ,G
ps.executeUpdate();⑴ p&:(D=pIu
//ps.addBatch();⑵ RSNukg
} Mpm#a0f
//int [] counts = ps.executeBatch();⑶ "uz}`G~O
conn.commit(); ZkyH<Aa
}catch(Exception e){ }538vFNi
e.printStackTrace(); 4mG?$kCN
} finally{ gZFtV
try{ H^N@fG<*dh
if(ps!=null) { Z.Sq5\d
ps.clearParameters(); kO]],Vy`
ps.close(); @y (9LSs
ps=null; 6<h?%j(
} v\Y362Xv
}catch(SQLException e){} 6%K,3R-d
DBUtils.closeConnection(conn); !;YmLJk;hN
} PLi [T4u
} nJ.<yrzi
public long getLast(){ %CxrXU
return lastExecuteTime; f2sv$#'
} -m&