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: b@Ej$t&
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CountBean.java Q^(CqQo!<
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/* $w0TEO!
* CountData.java $DY#04Je\=
* Jo5B mh0
* Created on 2007年1月1日, 下午4:44 YM}a>o
* @/z\p7e
* To change this template, choose Tools | Options and locate the template under M@Th^yF+8H
* the Source Creation and Management node. Right-click the template and choose :os8"
* Open. You can then make changes to the template in the Source Editor. \P<aK$g
*/ 5Gz!Bf@!!
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package com.tot.count; >,e^}K}C
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/** Vrt$/ d
* F9fLJol
* @author 5,"c1[`-
*/ ,md_eGF
public class CountBean { fiGTI}=P
private String countType; K:,V>DL
int countId; xfYKUOp/
/** Creates a new instance of CountData */ PkvW6,lS
public CountBean() {} G4*
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public void setCountType(String countTypes){ m\&|#yq
this.countType=countTypes; 2u3Kyn
} K10G+'H^
public void setCountId(int countIds){ h `Lr5)B'
this.countId=countIds; S!(3-{nC
} '`>%RZ]
public String getCountType(){ cQ8[XNa
return countType; 6"&cQ>$xh
} yHeL&H
public int getCountId(){ mY"7/dw<v
return countId; O^L]2BVC
} CX|W$b)%
} nu0pzq\6
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CountCache.java orGMzC 2
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/* j4~(6Imm
* CountCache.java O_FB^BB
* PLCm\Oh$l
* Created on 2007年1月1日, 下午5:01 CTIS}_CWd=
* W A/dt2D|
* To change this template, choose Tools | Options and locate the template under uNyU]@R<W
* the Source Creation and Management node. Right-click the template and choose (i~UH04r>s
* Open. You can then make changes to the template in the Source Editor. _{[6hf4p
*/ n7t}G'*Y!^
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package com.tot.count; y;b#qUd5a
import java.util.*; Z/Rp?Jz\j/
/** .9J^\%JD
* I9X\@lTf
* @author DQG%`-J
*/ B/agW
public class CountCache { jSI1tW8
public static LinkedList list=new LinkedList(); \s=r[0tj!
/** Creates a new instance of CountCache */ ;K<VT\
public CountCache() {} m$vq%[/#
public static void add(CountBean cb){ f_~T
if(cb!=null){ Zbczbnj
list.add(cb); WtOjPW
} K[T0);hZR
} %' DOFiU
} KuR]X``2
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CountControl.java H:.~!
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/* #}7T$Va
* CountThread.java v5[gFY(?
* 72nZ`u
* Created on 2007年1月1日, 下午4:57 ,Fn;*
* LUQ.=:mBR
* To change this template, choose Tools | Options and locate the template under d"|_NG` vr
* the Source Creation and Management node. Right-click the template and choose E@ea?Sx
* Open. You can then make changes to the template in the Source Editor. hz/mNDE]
*/ 9PB%v.t5y
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package com.tot.count; aO{@.
import tot.db.DBUtils; u62H+'k}F
import java.sql.*; Uu7]`U l
/** P'KA-4!
* ?mNB:-Q
* @author wDvu2iC=
*/ tddwnpnSw
public class CountControl{ &eMd^l}:#
private static long lastExecuteTime=0;//上次更新时间 Y -it3q'Z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ?o(284sV3
/** Creates a new instance of CountThread */ S)hDsf.I
public CountControl() {} c/Pql!h+
public synchronized void executeUpdate(){ 0moA mfc
Connection conn=null; a;[\ nCK
PreparedStatement ps=null; f0P,j~]
try{ 3eY>LWx
conn = DBUtils.getConnection();
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conn.setAutoCommit(false); A;8kC}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3I 0pHP5
for(int i=0;i<CountCache.list.size();i++){ q
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CountBean cb=(CountBean)CountCache.list.getFirst(); / =9Y(v
CountCache.list.removeFirst(); X3sAy(q
ps.setInt(1, cb.getCountId()); (Z<@dkO?)
ps.executeUpdate();⑴ |&K;*g|a
//ps.addBatch();⑵ jm%P-C
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} k[ *9b:~
//int [] counts = ps.executeBatch();⑶ 8Yc-3ozH
conn.commit(); h[dJNawL
}catch(Exception e){ QPm[4Fd{G
e.printStackTrace(); 7 7bwYKIn
} finally{ 2S_u/32]W
try{ 4A+g-{d
if(ps!=null) { 4D&