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: {14fA)`%
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CountBean.java "W7K"=X
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/* RSyUaA
* CountData.java y@: h4u"3
* mCsMqDH
* Created on 2007年1月1日, 下午4:44 .* ?wF
* I7vz+>Jr
* To change this template, choose Tools | Options and locate the template under ):6 8%,
* the Source Creation and Management node. Right-click the template and choose M2>Vj/
* Open. You can then make changes to the template in the Source Editor. Ml{Z
*/ ,,&*:<Q
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package com.tot.count; 6azGhxh
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/** $=8
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* p{Yv3dNl
* @author F^t DL:
*/ wc NOLUl
public class CountBean { HJLG=mU
private String countType; p;59?
int countId; gx8ouOh
/** Creates a new instance of CountData */ k"T}2 7
public CountBean() {} ^T;*M_
public void setCountType(String countTypes){ ;4^Rx
this.countType=countTypes; \378rQU
} 0w\zLU
public void setCountId(int countIds){ vMi;+6'n>
this.countId=countIds; Jr
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} `iAF3:
public String getCountType(){ 0d"[l@UU0
return countType; Vod\a5c
} dGYn4i2k?
public int getCountId(){ Ustv{:7v
return countId; <ro7vPKNa
} uk<4+x,2)
} 8 S:w7Hr
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CountCache.java B:;pvW]
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/* |mdVdD~go
* CountCache.java (
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* 3s,g*
* Created on 2007年1月1日, 下午5:01 .779pT!,M
* ?cBwPetp
* To change this template, choose Tools | Options and locate the template under \:# L)
* the Source Creation and Management node. Right-click the template and choose av}k)ZT_
* Open. You can then make changes to the template in the Source Editor. eueH)Xkf
*/ 0_95|3kc
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package com.tot.count; w(*vj
import java.util.*; +qtJaYf/0
/** c)TPM/>(p
* *v
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* @author 2\A$6N;_
*/ nX6u(U
public class CountCache { DkY4MH?
public static LinkedList list=new LinkedList(); |"X*@s\'
/** Creates a new instance of CountCache */ xaq-.IQAM$
public CountCache() {} 8rnwXPBN
public static void add(CountBean cb){ N_kMK
if(cb!=null){ 7u -p%eq2
list.add(cb); Z58X5"
} (Ft+uuG
} (Du@ S
} Zw
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CountControl.java ~rE|%o
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/* =\&;Fi]
* CountThread.java =V,mtT
* DbBcQ%
* Created on 2007年1月1日, 下午4:57 a?I=
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* 1y4|{7bb
* To change this template, choose Tools | Options and locate the template under }WC[$Y_@
* the Source Creation and Management node. Right-click the template and choose &=@IzmA
* Open. You can then make changes to the template in the Source Editor. KVoS
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*/ 5Md=-,'J!
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package com.tot.count; ="1Ind@w!
import tot.db.DBUtils; {nBhdM :i
import java.sql.*; >\-hO&%_
/** E<{R.r
* .;y.]Z/;
* @author Z,
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*/ p,5i)nEFj
public class CountControl{ Go`vfm"S
private static long lastExecuteTime=0;//上次更新时间 e8>})
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A2I9R;}
/** Creates a new instance of CountThread */ lLX4Gq1
public CountControl() {} =57>!)
public synchronized void executeUpdate(){ oA7tEu
Connection conn=null; n$MO4s8)
PreparedStatement ps=null; (Z+.45{-
try{ lK?uXr7^
conn = DBUtils.getConnection(); LiC*@W
conn.setAutoCommit(false); YiXk5B0Uh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ^]>O;iB?
for(int i=0;i<CountCache.list.size();i++){ (R[[Z,>w.
CountBean cb=(CountBean)CountCache.list.getFirst(); m4[ ;(1
CountCache.list.removeFirst(); |{z:IQLv
ps.setInt(1, cb.getCountId()); YquI $PV _
ps.executeUpdate();⑴ 'Cb6Y#6
//ps.addBatch();⑵ uanhr)Ys
} 8l>?Pv
//int [] counts = ps.executeBatch();⑶ 6C1#/
conn.commit(); J|W<;
}catch(Exception e){ 1jmjg~W
e.printStackTrace(); JK7G/]j+Ez
} finally{ lZd(emH@
try{ 7cuE7"
if(ps!=null) { t>L2
ps.clearParameters(); sNbxI|B
ps.close(); JinUV6cr
ps=null; s$zLiQF;
} S*,17+6dV
}catch(SQLException e){} gldAP:
DBUtils.closeConnection(conn); Q4#.X=.d
} k%]3vRo<
} YU'k#\gi*
public long getLast(){ =Pyj%4Rs
return lastExecuteTime; $f$SNx)),
} |QF7
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public void run(){ frm>4)9+
long now = System.currentTimeMillis(); lne|5{h
if ((now - lastExecuteTime) > executeSep) { BwN0!lsF3
//System.out.print("lastExecuteTime:"+lastExecuteTime); E'f{i:O"~
//System.out.print(" now:"+now+"\n"); juP7P[d$qW
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); =eq[:K<6
lastExecuteTime=now; :p1u(hflS
executeUpdate(); 7zl5yKN
} ]
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else{ D5gFXEeh
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); s-NX o
} eFB5=)ld
} CYf$nYR
} Zcey|m*|
//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 9sM!`Lz{
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类写好了,下面是在JSP中如下调用。 .o6Or:L
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<% 4V"E8rUL(
CountBean cb=new CountBean(); 3#n_?-
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); h7*J9[$
CountCache.add(cb); A\*>TN>s
out.print(CountCache.list.size()+"<br>"); Ky`qskvu
CountControl c=new CountControl(); =?5]()'*n
c.run(); b.OsiT;_j
out.print(CountCache.list.size()+"<br>"); h<h%*av|
%>