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: -8Z;s8ACo
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CountBean.java bF_SD\/
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/* ,2yIKPWk
* CountData.java 2'>
* JDbRv'F:(
* Created on 2007年1月1日, 下午4:44 P*=M?:Jb,
* fXo$1!
* To change this template, choose Tools | Options and locate the template under r.WQ6h/eZ5
* the Source Creation and Management node. Right-click the template and choose Fa]|Y
* Open. You can then make changes to the template in the Source Editor. EA#{N<
*/ o8uak*"{
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package com.tot.count; sVT:1 kI
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/** &YiUhK
* [2*?b/q3J
* @author _+B{n^ {
*/ ?$v*_*:2h
public class CountBean { E@.daUoB
private String countType; wqx9
int countId; LH_VdLds
/** Creates a new instance of CountData */ (^!$m7
public CountBean() {} E\/J& .
public void setCountType(String countTypes){ Vt4KG+zm
this.countType=countTypes; G;jX@XqZ
} ;T-`~
public void setCountId(int countIds){ i#4}xvi
this.countId=countIds; g
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} SN#Cnu}
public String getCountType(){ 8uh^%La8b.
return countType; ,8Eg/
} k-CW?=
public int getCountId(){ lE=&hba
return countId; #(Xv\OE
} S{d]0
} rq(9w*MW:
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CountCache.java DH9p1)L'
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/* ?1afW)`a.v
* CountCache.java lZ'ZL*
* 8T523VI
* Created on 2007年1月1日, 下午5:01 Q8h0:Q
* q1Sr#h|
* To change this template, choose Tools | Options and locate the template under dy"7Wl]hi7
* the Source Creation and Management node. Right-click the template and choose 9EFQo^
E
* Open. You can then make changes to the template in the Source Editor. )\PPIY>iP
*/ +T8h jOkC
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package com.tot.count; D~Rv"Hh
import java.util.*; Y@ l>4q")
/** '/U% -/@
* VX6M4<8
* @author <^n@q f}
*/ wn Q% 'Eo
public class CountCache { nN'>>'@>
public static LinkedList list=new LinkedList(); !Bu=?gf
/** Creates a new instance of CountCache */ O-uf^S4
public CountCache() {} JT cE{i
public static void add(CountBean cb){ boeIO\2}P0
if(cb!=null){ w+][L||4c
list.add(cb); D b&=
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} oK@_
} w678
} 0Qr|!B:+9)
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CountControl.java $aC%&&+wG
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/* VJbn/5+P
* CountThread.java 6[T)Q ^0`
* FT;I|+H*P
* Created on 2007年1月1日, 下午4:57 os[i
* cv7.=*Kb;
* To change this template, choose Tools | Options and locate the template under rD!UP1Nb
* the Source Creation and Management node. Right-click the template and choose _m@+d>f_
* Open. You can then make changes to the template in the Source Editor. 3kW%,d*_
*/ (nnIRN<}$
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package com.tot.count; FIN0~
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import tot.db.DBUtils; t~V?p'a0ys
import java.sql.*; y.aeXlc[
/** LL%s$>c65A
* m?y'Y`
* @author lPA:ho/`:
*/ QD*\zB
public class CountControl{ 5?HoCz]l
private static long lastExecuteTime=0;//上次更新时间 z^Y4:^L~I
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 }>yQ!3/i
/** Creates a new instance of CountThread */ 92D :!C
public CountControl() {} W61nJ7@
public synchronized void executeUpdate(){ zwgO|Qg;
Connection conn=null; -(VX+XHW
PreparedStatement ps=null; z)fg>?AGr
try{ [&5%$ T
conn = DBUtils.getConnection(); ./_4D}
conn.setAutoCommit(false); ;~"#aL50fe
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); jc7NYoT:
for(int i=0;i<CountCache.list.size();i++){ UNCI"Mjb
CountBean cb=(CountBean)CountCache.list.getFirst(); XQStlUw8+
CountCache.list.removeFirst(); ]]6
ps.setInt(1, cb.getCountId()); \~#$o34V
ps.executeUpdate();⑴ JPM W|JT
//ps.addBatch();⑵ Clmz}F
} ?{(Jy*
//int [] counts = ps.executeBatch();⑶ P"s7}cl
conn.commit(); nC@UK{tVa
}catch(Exception e){ YPmgR]=6
e.printStackTrace(); (i@B+c
} finally{ EMw
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try{ fctVJ{?
if(ps!=null) { V_P,~!
ps.clearParameters(); G|LcTV
ps.close(); E>&oe&`o'
ps=null; PbIir=
} AkX8v66:
}catch(SQLException e){} l.%[s6
DBUtils.closeConnection(conn); 3h4'DQ.g
} EViDMp"
} ]cP$aixd
public long getLast(){ wh#x`Nc
return lastExecuteTime; MB"<^ZX
} /rzZU} 3[
public void run(){ yr
q){W
long now = System.currentTimeMillis(); +<7a$/L?4
if ((now - lastExecuteTime) > executeSep) { lQt* LWd[
//System.out.print("lastExecuteTime:"+lastExecuteTime); sSsRn*LN-:
//System.out.print(" now:"+now+"\n"); a3B^RbDP&8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &-(p~[|
lastExecuteTime=now; 9 UcSQ"D
executeUpdate(); #TD0)C/
} WXX08"
else{ *6QmYq6c<
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); c n^z=?
} cE7IHQ
} o0FVVS l
} I7HP~v~
//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 :eL
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类写好了,下面是在JSP中如下调用。 5tcJTz
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<% l>?k>NEpP
CountBean cb=new CountBean(); 4qg]
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ds<q"S{p
CountCache.add(cb); 5u^;71
out.print(CountCache.list.size()+"<br>"); wKj0vMW
CountControl c=new CountControl(); mVEHVz $
c.run(); EM0]"s@Lf
out.print(CountCache.list.size()+"<br>"); k%h%mz
%>