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: 4T]n64Yid
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CountBean.java =Zg%& J
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/* 1:L _qL
* CountData.java t%xD epFQ
* h5vvizruy
* Created on 2007年1月1日, 下午4:44 jJ(()EJ
* U{^~X_?
* To change this template, choose Tools | Options and locate the template under q4'Vb
* the Source Creation and Management node. Right-click the template and choose GIo7-
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* Open. You can then make changes to the template in the Source Editor. 6*!R'
*/ s]tBd!~
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package com.tot.count; 1Wz -Z
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/** s]D&):
* -!p +^wC
* @author W,\LdQ
*/ QX1rnVzg0
public class CountBean { dI[hQxU
private String countType; , [V#o-Z
int countId; L?WF[nFR
/** Creates a new instance of CountData */ G;^}, %<
public CountBean() {} {$dq7m(
public void setCountType(String countTypes){ YlF<S49loC
this.countType=countTypes; YPq4VX,
} O.ce"5Y^
public void setCountId(int countIds){ BqF%2{
this.countId=countIds; 5x([fG
} F4Jc7k2
public String getCountType(){ x4r=ENO)q
return countType; V3^=Mj2"
} R]s\s[B
public int getCountId(){ E{Gkq:
return countId; A,P_|
} dZMOgZ.!yr
} fR:BF47
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CountCache.java ,wyfMOGLt
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/* (wMiXi
* CountCache.java t[L_n m5-
* *5kQ6#l
* Created on 2007年1月1日, 下午5:01 `cz%(Ry,
* e 58
* To change this template, choose Tools | Options and locate the template under >u6*P{;\
* the Source Creation and Management node. Right-click the template and choose R a> k#pQ
* Open. You can then make changes to the template in the Source Editor. :^G;`T`L
*/ |^uU &O;.
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package com.tot.count; m'L7K K-Y)
import java.util.*; 'aq9]D_k
/** Z~JX@s0v
* 3)?v
* @author *{ =5AW}o
*/ 2
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public class CountCache { $p(,Qz(.8
public static LinkedList list=new LinkedList(); FuA8vTV{
/** Creates a new instance of CountCache */ y([""z3<w
public CountCache() {} H
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public static void add(CountBean cb){ \`nRgYSE
if(cb!=null){ Qh3V[br
list.add(cb); QG|KZ8uO
} vf|lF9@U
} } Fw/WD
} gK`o;` ^
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CountControl.java /Ir|& <yB
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/* BW`)q/
* CountThread.java (|{b ZW}
* '1$#onx
* Created on 2007年1月1日, 下午4:57 C4#E N}
* JTK0#+?
* To change this template, choose Tools | Options and locate the template under #[4Mw M3
* the Source Creation and Management node. Right-click the template and choose VcLB0T7m\
* Open. You can then make changes to the template in the Source Editor. shjq4#9
*/ fn!(cE|`E
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package com.tot.count; @,Re<%\
import tot.db.DBUtils; N@o Ng}D&:
import java.sql.*; 7]i=eD8
/** X_j=u1*5
* 3eq VY0q
* @author >N&C-6W
*/ QGWfF,q
public class CountControl{ oAMB}a;
private static long lastExecuteTime=0;//上次更新时间 @V9qbr=Z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 TQcEe@$)
/** Creates a new instance of CountThread */ h-^7cHI}
public CountControl() {} L>,j*a_[
public synchronized void executeUpdate(){ @YH<Hc
Connection conn=null; CL~21aslI
PreparedStatement ps=null; MzF9 &{N
try{ ;AFF7N>&
conn = DBUtils.getConnection(); LC!ZeW35
conn.setAutoCommit(false); |o:[*2-
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); .^?^QH3
for(int i=0;i<CountCache.list.size();i++){ #rE#lHo
CountBean cb=(CountBean)CountCache.list.getFirst(); DeMF<)#
CountCache.list.removeFirst(); <])w@QOA#
ps.setInt(1, cb.getCountId()); f/FK>oUh
ps.executeUpdate();⑴ c|kQ3(
//ps.addBatch();⑵ ;[)t*yAh
} liYR8 D
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//int [] counts = ps.executeBatch();⑶ 5M.KF;P
conn.commit(); 97$1na3gq
}catch(Exception e){ #WOb&h
e.printStackTrace(); 7c:5Ey
} finally{ jq4'=L$4
try{ 4z~%gt74O]
if(ps!=null) { &HPzm6.3
ps.clearParameters(); 33R_JM{
ps.close(); /,>@+^ 1
ps=null; ~-"<)XPe
} 5]Wkk~a
}catch(SQLException e){} =,*4:TU
DBUtils.closeConnection(conn); }]qx "
} 5`ma#_zk|f
} xJ;DkPh
public long getLast(){ d/Sx+1
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return lastExecuteTime; W|go*+`W%
} GM5s~,
public void run(){ ZQd\!K8y^Q
long now = System.currentTimeMillis();
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if ((now - lastExecuteTime) > executeSep) { Rwy<#9R[x
//System.out.print("lastExecuteTime:"+lastExecuteTime); UE3#(:xA
//System.out.print(" now:"+now+"\n"); Dn[iA~
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9Q!X~L|\S
lastExecuteTime=now; ,W'?F9Y\
executeUpdate(); jY]hMQ/H
} uq}>5
else{ oEqt7l[I{
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); [5v[Zqud
} VW7
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} )/'y'd<r
} e[3rz%'Q
//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*)@:W!
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类写好了,下面是在JSP中如下调用。 ;K'1dsA
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<% y=L9E?
CountBean cb=new CountBean(); H:~41f[
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Q~5!c#r
CountCache.add(cb); Cq7EdK;x
out.print(CountCache.list.size()+"<br>"); 'xO^2m+N;
CountControl c=new CountControl(); Vx]{<}(gr
c.run(); 94=aVM\>>
out.print(CountCache.list.size()+"<br>"); Z/z(P8#U\
%>