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: b9)%,3-
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CountBean.java ~1`.iA
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/* -dsB@nPiUw
* CountData.java <>A:Oi3^
* Ljq/f&
c
* Created on 2007年1月1日, 下午4:44 }C/u>89%q
* (Z=ziopDE
* To change this template, choose Tools | Options and locate the template under chQt8Ar3
* the Source Creation and Management node. Right-click the template and choose pAtHU(}
* Open. You can then make changes to the template in the Source Editor. xM9EO(u
*/ ~7Kqc\/H&I
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package com.tot.count; ?xGxr|+a
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/** ] ^tor
* [N$da=`wv
* @author V=VL@=
*/ `x lsvK>
public class CountBean { sT[)r]`T
private String countType; HLg/=VF7?
int countId; H4Ca+;
/** Creates a new instance of CountData */ FviLlly6
public CountBean() {} ;j-@
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public void setCountType(String countTypes){ @BbZ(cZ*
this.countType=countTypes; -9~kp'_a
} 9<k<HmkD
public void setCountId(int countIds){ )pjd*+V
this.countId=countIds; E8T4Nh_
} W'E!5T^
public String getCountType(){ t LdBnf
return countType; FAjO-T4(
} D'YF[l
public int getCountId(){ F8 ;M++
return countId; Nv,[E+a2
} ;DL|%-%;$r
} mn{8"@Z
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CountCache.java #^gn,^QQ
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/* 1.o-2:]E
* CountCache.java 4))u*c/,
* @z EEX9U
* Created on 2007年1月1日, 下午5:01 _{8f^@I"+
* `4.Wdi-Si
* To change this template, choose Tools | Options and locate the template under 5{zXh
* the Source Creation and Management node. Right-click the template and choose 79~,KFct
* Open. You can then make changes to the template in the Source Editor. Oo`P +S#
*/ I.fV_
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package com.tot.count; iH9g5G`O
import java.util.*; qRJg/~_h{
/** iv?'&IUfK
* K)]7e?:Wu
* @author MnO,Cd6{%d
*/ T$06DS
public class CountCache { m`g%\o^6i
public static LinkedList list=new LinkedList(); 0'TqW9P
/** Creates a new instance of CountCache */ mbsdiab#N
public CountCache() {} &{7n
public static void add(CountBean cb){ {v+i!a'+
if(cb!=null){ ?#qA>:2,
list.add(cb); w^ui%9
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} W:3u$LTf*f
} M`FsKK`
} 6^wg'u]c
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CountControl.java n8w|8[uV^
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/* $9y]>R
* CountThread.java DHbLS3-
* n #p6i
* Created on 2007年1月1日, 下午4:57 TIW6v4
* dY~3YD[
* To change this template, choose Tools | Options and locate the template under MEI]N0L3
* the Source Creation and Management node. Right-click the template and choose 7\"-<z;kK
* Open. You can then make changes to the template in the Source Editor. 1UJ(._0hR
*/
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package com.tot.count; !}"npUgE
import tot.db.DBUtils; 6O"Vy
import java.sql.*; Nk3]<#$
/** D,mFme
* 56G5JSB=\
* @author "h7Z(Y
*/ m,K\e
public class CountControl{ 1;fs`k0p
private static long lastExecuteTime=0;//上次更新时间 /_*:
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 E5jK}1t4V
/** Creates a new instance of CountThread */ {AO3o<-h
public CountControl() {} z:+Xs!S
public synchronized void executeUpdate(){ 18}L89S>
Connection conn=null; Kw(/#C:$
PreparedStatement ps=null; 3 V8SKBS
try{ )Si`>o3T-.
conn = DBUtils.getConnection(); 01H3@0Q6
conn.setAutoCommit(false); n-Dr/c4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ,PJl32
for(int i=0;i<CountCache.list.size();i++){ eY\tO"Hc
CountBean cb=(CountBean)CountCache.list.getFirst(); aMm`G}9n
CountCache.list.removeFirst(); ;r49H<z
ps.setInt(1, cb.getCountId()); _]j=[|q 9
ps.executeUpdate();⑴ tK g%5;v
//ps.addBatch();⑵ 4yQ4lU,r
} ++R-_oQ
//int [] counts = ps.executeBatch();⑶ \Vm{5[ :SA
conn.commit(); A~*Wr+pv
}catch(Exception e){ M[<O]p6
e.printStackTrace(); DQ9 <N~l
} finally{ J-Sf9^G
try{ I #1_
if(ps!=null) { P/nXY
ps.clearParameters(); U!3nn#!yE
ps.close(); b'3#FI=:
ps=null; CrS[FM= +W
} YlPZa3\
}catch(SQLException e){} ~+l%}4RZ
DBUtils.closeConnection(conn); u>k;PUH4
} "D3JdyO_S
} -d_FB?X
public long getLast(){ :".!6~:2
return lastExecuteTime; :w:5;cmV
} F
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public void run(){ g=i|D(".
long now = System.currentTimeMillis(); tE>3.0U0Q
if ((now - lastExecuteTime) > executeSep) { i;/qJKr
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7:bqh$3!s
//System.out.print(" now:"+now+"\n"); -[^wYr=
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); [jAhw>
lastExecuteTime=now; dr'6N1B@
executeUpdate(); <6v7_
}
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else{ c^Wm~"r
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); KxJJ?WyM
} uA}asm
} 8 ehC^Cg
} M{~eI
//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 X 8[T*L.
@M,KA {e
类写好了,下面是在JSP中如下调用。 =1\'xz}p?
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<% Ir0er~f+z
CountBean cb=new CountBean(); ORfA]I-u
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); jg%D
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CountCache.add(cb); N3x}YHFF
out.print(CountCache.list.size()+"<br>"); 0&5}[9?V'
CountControl c=new CountControl(); JpSS[pOg
c.run(); i>!f|<
out.print(CountCache.list.size()+"<br>"); U(J?Q
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