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: @AM11v\:
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CountBean.java :K 5?&kT
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/* )U7fPKQ
* CountData.java 1wm`a
* ^!x! F
* Created on 2007年1月1日, 下午4:44 81C;D`!K
* M6bM`wHH>
* To change this template, choose Tools | Options and locate the template under '1(6@5tyWk
* the Source Creation and Management node. Right-click the template and choose CRD=7\0(D+
* Open. You can then make changes to the template in the Source Editor. Ql%B=vgKL
*/ UNK.39
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package com.tot.count; z~==7:Os
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/** q#SEtyJL
* 3=^)=yOd
* @author C"$~w3A k
*/ ;mRZ_^V;
public class CountBean { oe|8
private String countType; Xk/iyp/
int countId; ~y?Nn8+&f
/** Creates a new instance of CountData */ #oR`_Dm)P
public CountBean() {} \XYidj
public void setCountType(String countTypes){ )2#&l
this.countType=countTypes; 2r;h">
} ca3SE^
public void setCountId(int countIds){ %H;}+U]Z
this.countId=countIds; _RUL$Ds
}
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public String getCountType(){ ^G2M4+W|
return countType; 4HR36=E6
} ' Ttsscv
public int getCountId(){ ![nL/
return countId; S;jD@j\t&
} tv`b##
} 1X7GM65#
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CountCache.java \#WWJh"W
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/* ij!],
* CountCache.java DA04llX~
* 5!cp^[rGL
* Created on 2007年1月1日, 下午5:01 -FI)o`AE
* lC`w}0p
* To change this template, choose Tools | Options and locate the template under <:NahxIlu
* the Source Creation and Management node. Right-click the template and choose B- $?5Ft!
* Open. You can then make changes to the template in the Source Editor. %l14K_
*/ *v]s&$WyO
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package com.tot.count; 93:oXyFjD
import java.util.*; 9#m3<oSJ
/** #/jug[wf*!
* *W2)!C|
* @author 4(VV@:_%
*/ ExSM=
public class CountCache { /CMgWGI
public static LinkedList list=new LinkedList(); 7(uz*~Z?`0
/** Creates a new instance of CountCache */ bJ2>@|3*
public CountCache() {} Dr(2@0P
public static void add(CountBean cb){ MG~Z)+g=y
if(cb!=null){ a!/\:4-uc
list.add(cb); X 6tJ
} ;6D3>Lm
} JN4gH4ez)
} e^3D`GA
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CountControl.java ok0ZI>=,
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/* a/J Mg
* CountThread.java 0nL
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* &VA^LS@b
* Created on 2007年1月1日, 下午4:57 71Za!3+
* AIY 1sSK
* To change this template, choose Tools | Options and locate the template under c*.
* the Source Creation and Management node. Right-click the template and choose LTo5v
* Open. You can then make changes to the template in the Source Editor. gzn:]Y^
*/ n|6G\99l+M
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package com.tot.count; 8Iu6r}k?~`
import tot.db.DBUtils; qg=`=]j
import java.sql.*; mXyN{`q=
/** U;4i&=.!
* fM7B<eB
* @author sve} ent
*/ /3Gq&[R{
public class CountControl{ ZOcpF1y
private static long lastExecuteTime=0;//上次更新时间 M2p|&Z%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8<mloM-4
/** Creates a new instance of CountThread */ ~tyqvHC
public CountControl() {} 9#:fQ!3`
public synchronized void executeUpdate(){ 2>o^@4PnZ
Connection conn=null; R9 Ab.t
PreparedStatement ps=null; {Ji&rk}NP
try{ ]'[:QGr
conn = DBUtils.getConnection(); ^|p D(v
conn.setAutoCommit(false); wK7w[Xt
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); XHj%U
for(int i=0;i<CountCache.list.size();i++){ >r7PK45.K
CountBean cb=(CountBean)CountCache.list.getFirst(); ?d%{-
CountCache.list.removeFirst(); =X^a
ps.setInt(1, cb.getCountId()); E;{CoL
ps.executeUpdate();⑴ |h6!b t!=
//ps.addBatch();⑵ vA!IcDP"
} D
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//int [] counts = ps.executeBatch();⑶ 4'*-[TKC
conn.commit(); 3<+ZA-2
}catch(Exception e){ /;+\6(+X
e.printStackTrace(); 9
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} finally{ BJb,
try{
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if(ps!=null) { Z!~_#_Ugl
ps.clearParameters(); =v?P7;T
ps.close(); 2wB*c9~
ps=null; }|2A6^FH.
} &'&)E((
}catch(SQLException e){} |v8hg])I+
DBUtils.closeConnection(conn); aaCRZKr
} 6q8}8;STTY
} <uB)u>3
public long getLast(){ e
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return lastExecuteTime; yP# Y:s
} MXfyj5K
public void run(){ ><D2of|
long now = System.currentTimeMillis(); bAH<h
if ((now - lastExecuteTime) > executeSep) { 8Cp@k=
//System.out.print("lastExecuteTime:"+lastExecuteTime); yc?L
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//System.out.print(" now:"+now+"\n"); M0xhcU_
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 4]tg! ks
lastExecuteTime=now; HQ9tvSc
executeUpdate(); u9KT_`
)
} ru2M"]T
else{ {+_p?8X
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); CF','gPnc
} $Z]@N
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} "Zhh>cz
} !ITM:%
//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 cL*oO@I&_
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类写好了,下面是在JSP中如下调用。 y[.lfW?)
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<% "Hz%0zP&
CountBean cb=new CountBean(); $`W3`}#fM
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); O&aD]~|
CountCache.add(cb);
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out.print(CountCache.list.size()+"<br>"); Zl&ED{k<
CountControl c=new CountControl(); 2;"vF9WMm
c.run(); 8%u|[Si;
out.print(CountCache.list.size()+"<br>"); #z&R9$
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