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: (<bm4MPf
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CountBean.java tp6csS,
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/* {uaZ<4N.
* CountData.java 4GU/V\e|
* eq@am(#&kY
* Created on 2007年1月1日, 下午4:44 <THZ2`tTK3
* d}{LM!s
* To change this template, choose Tools | Options and locate the template under E-yT
* the Source Creation and Management node. Right-click the template and choose jb|mip@`
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* Open. You can then make changes to the template in the Source Editor. %1-K);SJ
*/ e-CNQnO~
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package com.tot.count; ,67"C2Y
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/** T3USNc51
* .>mH]/]m
* @author ]>R`;"(
*/ AW,v
public class CountBean { V;h=8C 5J
private String countType; e/"yGQu
int countId; qj~flw1:
/** Creates a new instance of CountData */ mF[o*N*
public CountBean() {} lZ|L2Yg3uB
public void setCountType(String countTypes){ u* t,i`
this.countType=countTypes; NJ;"jQ-
} 8
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public void setCountId(int countIds){ fm(mO%
this.countId=countIds; @4IW=V
} up\oWR:
public String getCountType(){
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return countType; b]!9eV$
} G(U 9rJ9
public int getCountId(){ doP$N3Zm
return countId; v ! 7s
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} \#4m@
} ?M *7@t@
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CountCache.java r4O|()
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/* 9R9__w;
* CountCache.java Y3#Nux%
* L'zE<3O'3
* Created on 2007年1月1日, 下午5:01 uije#cj#O
* ,:D=gQ@`
* To change this template, choose Tools | Options and locate the template under a}:A, t<6
* the Source Creation and Management node. Right-click the template and choose v8ba~
* Open. You can then make changes to the template in the Source Editor. 2
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*/ 21r==
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package com.tot.count; 2O
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import java.util.*; K(<$.
/** 8zhBA9Y#~
* "-w^D!C
* @author rRB~=J"
*/ \HAJ\9*w)
public class CountCache { 95=gY
public static LinkedList list=new LinkedList(); kOw=c Gt
/** Creates a new instance of CountCache */ '.?^uM
public CountCache() {} t)YUPDQ@J
public static void add(CountBean cb){ <fN;
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if(cb!=null){
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list.add(cb); tawe Gc%~
} F\a]n^
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} 3Jk[/.h
} H&M1>JtE
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CountControl.java G6ayMw]OF
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/* {P-xCmZ~Wt
* CountThread.java $@_{p*q
* 93j{.0]X
* Created on 2007年1月1日, 下午4:57 M\Se_
* a 6%@d_A
* To change this template, choose Tools | Options and locate the template under eP "`,<
* the Source Creation and Management node. Right-click the template and choose XAe\s`
* Open. You can then make changes to the template in the Source Editor. \V,c]I
*/ "!O1j
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package com.tot.count; bmu6@jT
import tot.db.DBUtils; "e 1wr
import java.sql.*; Y9F)`17
/** cJCU*(7&
* `ncNEHh7K
* @author \)OEBN`9#
*/ @Mm/C?#*O
public class CountControl{ jpRBER_X
private static long lastExecuteTime=0;//上次更新时间 %SAw;ZtQ:
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `OqM8U
@
/** Creates a new instance of CountThread */ ;j{7!GeKa
public CountControl() {} YTK^ijmU6x
public synchronized void executeUpdate(){ owvS/"@
Connection conn=null; fAGctRGH
PreparedStatement ps=null; `H\)e%]
try{ Y;Ap9i*
conn = DBUtils.getConnection(); 8nCp\0
conn.setAutoCommit(false); Y25^]ON*\^
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 8'A72*dhX
for(int i=0;i<CountCache.list.size();i++){ >H>gH2qp
CountBean cb=(CountBean)CountCache.list.getFirst(); q/NY72tj0
CountCache.list.removeFirst(); j(iuz^I
ps.setInt(1, cb.getCountId()); ~:4~2d|
ps.executeUpdate();⑴ =. *98
//ps.addBatch();⑵ t6+YXjXK
} B:<
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//int [] counts = ps.executeBatch();⑶ 5,1{Tv`
conn.commit(); U&UKUACn"
}catch(Exception e){ SR ZL\m}
e.printStackTrace(); U3E&n1AA
} finally{ UZGDdP
try{ }g|nz8
if(ps!=null) { XM/vDdR
ps.clearParameters(); mk!Dozb/
ps.close(); !4WEk
ps=null; T dk
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} )0k']g5
}catch(SQLException e){} n2{SV
DBUtils.closeConnection(conn); }s_hD`'
} Ye5jB2Z
} ?P/AC$:|I
public long getLast(){ 6BocGo({
return lastExecuteTime; 9@K.cdRjQ
} .$&Q[r3Lu
public void run(){ +pf5\#l?
long now = System.currentTimeMillis(); (gwj)?:
if ((now - lastExecuteTime) > executeSep) { "0CjP+1k
//System.out.print("lastExecuteTime:"+lastExecuteTime); `]=oo%(h
//System.out.print(" now:"+now+"\n"); vi!YN|}\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); tnz+bX26
lastExecuteTime=now; Ub_4yN;
executeUpdate(); e)H!uR
} -)jax
else{ c>HK9z{
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); \,&9
} @?kM'*mrZM
} $g10vF3
} D\1k.tI
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 >\2:\wI
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类写好了,下面是在JSP中如下调用。 @F~LW6K
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<% J~#$J&iKh
CountBean cb=new CountBean();
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); nXA\|c0
CountCache.add(cb); QAPu<rdJP
out.print(CountCache.list.size()+"<br>"); g&Vcg`
CountControl c=new CountControl(); C3'rtY.
c.run(); R@iUCT^$
out.print(CountCache.list.size()+"<br>"); 'zZcn" +!
%>