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: >C`b4xQ
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CountBean.java z\,g %u41
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/* ey@]B5
* CountData.java O;9'0-F ?
* Zu\(XN?62
* Created on 2007年1月1日, 下午4:44 Uj)~ >V'
* iw\RQ
0
* To change this template, choose Tools | Options and locate the template under jmbwV,@Q2
* the Source Creation and Management node. Right-click the template and choose !_VKJZuH
* Open. You can then make changes to the template in the Source Editor. ;/fZh:V2
*/ (bxSN@hp2
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package com.tot.count; $ ZD1_sJ.
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/** GqXnOmk
* u%<Je
* @author Fu0 dYN
*/ ^[noGjy
public class CountBean { I
@TR|
private String countType; {)j3Pn
int countId; NDW6UFd>1
/** Creates a new instance of CountData */ .az+'1
public CountBean() {} \WG6\Zg0A
public void setCountType(String countTypes){ WG8}}`F|
this.countType=countTypes; )UA};Fus
} [R[]&\W
public void setCountId(int countIds){ f"zXiUV
this.countId=countIds; TT3GFP
} 79|=y7i#
public String getCountType(){ FUic7>
return countType; HV-c
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} M=$
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public int getCountId(){ <H{%`
return countId; p]/HZS.-b
} >J+'hm@
} SFVOof#s
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CountCache.java fvn`$
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/* P(Bj XMd
* CountCache.java W($}G_j[B1
* kH'LG! O
* Created on 2007年1月1日, 下午5:01 |
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* b^[Ab:`}[V
* To change this template, choose Tools | Options and locate the template under f%fD>a
* the Source Creation and Management node. Right-click the template and choose v?e@`;-
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* Open. You can then make changes to the template in the Source Editor. F!DDlYUz.
*/ tHAr9
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package com.tot.count; 5VD(fW[OW]
import java.util.*; 77D>;90>?
/** 0
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* ~9%L)nC2'
* @author Y+vG]?D
*/ m)l<2`CM
public class CountCache { -D*,*L
public static LinkedList list=new LinkedList(); ~6YTm6o
/** Creates a new instance of CountCache */ FXMrD,qVg
public CountCache() {} cP#vzFB0>
public static void add(CountBean cb){ Er /:iO)_
if(cb!=null){ L'(ei7Z
list.add(cb); je_:hDr
} !1G6ZC:z
} |^l17veA@
} P1cI]rriW
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CountControl.java 9)P-<
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/* -|F(qf
* CountThread.java XT2:XWI8
* TS2zzYE6Z
* Created on 2007年1月1日, 下午4:57 ckDWY<@v
* f/"?(7F
* To change this template, choose Tools | Options and locate the template under tUOqF
* the Source Creation and Management node. Right-click the template and choose s=KK)6T
* Open. You can then make changes to the template in the Source Editor. eKpWFP0
*/ {Xr|L
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package com.tot.count; ''p7!V?
import tot.db.DBUtils; 79HKfG2+KB
import java.sql.*; LIah'6qR
/** -_`dA^
* ^9_4#Ep(
* @author Al93x
*/ ][D/=-
public class CountControl{ Fu%D2%V$/
private static long lastExecuteTime=0;//上次更新时间 -F->l5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ,ma4bqRMc
/** Creates a new instance of CountThread */ [B_(,/?
public CountControl() {} xZ\`f-zL
public synchronized void executeUpdate(){ A#;TY:D2
Connection conn=null; =|j~*6Hd
PreparedStatement ps=null;
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try{ l|jb}9(J
conn = DBUtils.getConnection(); B5R/GV
conn.setAutoCommit(false); XYrZI/R
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }57d3s
for(int i=0;i<CountCache.list.size();i++){ 'uBagd>*
CountBean cb=(CountBean)CountCache.list.getFirst(); paYvYK-K?
CountCache.list.removeFirst(); 8+|7*Ud
ps.setInt(1, cb.getCountId()); EJByYk
ps.executeUpdate();⑴ 7eU|iDYo
//ps.addBatch();⑵ PrQs_tNi
} Z*Lv!6WS
//int [] counts = ps.executeBatch();⑶ >|W\8dTQ
conn.commit(); ^MczumG[
}catch(Exception e){ KQulz
e.printStackTrace(); +Rq7m]
} finally{ <