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: @ vrV*!
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CountBean.java a8 mVFm
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/* "G@g" gP
* CountData.java mM-8+H?~b
* *Ie7{EhJ'
* Created on 2007年1月1日, 下午4:44 $+3}po\
* X7i/fm{l'
* To change this template, choose Tools | Options and locate the template under kT!9`S\
* the Source Creation and Management node. Right-click the template and choose /O^RF }
* Open. You can then make changes to the template in the Source Editor. 7El[ >
*/ t[oT-r
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package com.tot.count; 5_z33,q2
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/** iIq)~e/ Z
* naw0$kXTA
* @author fI~Xmw+}}
*/ Y5FbU
public class CountBean { qh2ON>e;
private String countType; \u>"s
int countId; ^n"OL*ipG
/** Creates a new instance of CountData */ Bxfc}vC.
public CountBean() {} %ve:hym*
public void setCountType(String countTypes){ $W9{P;
this.countType=countTypes; $[/&74#0HX
} 'Ub
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public void setCountId(int countIds){ !cAyTl(_
this.countId=countIds; \&i P`v`K
} D0#x
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public String getCountType(){ B&.FOO
return countType; u(wGl_
} }c}|
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public int getCountId(){ [h34d5'w
return countId; Ie`13 L2
} QZ:8+[oy
} PV/77{'
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CountCache.java 'b#0t#|TM
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/* R%qGPO5Z\c
* CountCache.java d\61;C
* },>pDeX^P
* Created on 2007年1月1日, 下午5:01 N%"Y
* }`v~I4i
* To change this template, choose Tools | Options and locate the template under fbL\?S,w
* the Source Creation and Management node. Right-click the template and choose k=B]&F
* Open. You can then make changes to the template in the Source Editor. (jFGa2{
*/ S<WdZ=8sA
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package com.tot.count; oNU0 qZ5
import java.util.*; LjUy*mxw
/** lq> +~zX{
* #&m0WI1
* @author -sjd&)~S[
*/ (
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public class CountCache { \CXQo4P
public static LinkedList list=new LinkedList(); 3`B6w$z>(
/** Creates a new instance of CountCache */ n ;$5Cq!v=
public CountCache() {} ?kZTI (
public static void add(CountBean cb){ "9^j.
if(cb!=null){ )6Ny1x+
list.add(cb); 00SbH$SU
} 2cq I[t@0
} x7<\]94
} =}v}my3y"
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CountControl.java %T)oCjM[\
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/* C_n9T{k
* CountThread.java
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* zSSB>D
* Created on 2007年1月1日, 下午4:57 @*Wh
* .Y3pS/VI
* To change this template, choose Tools | Options and locate the template under z(fAnn
T?
* the Source Creation and Management node. Right-click the template and choose a e*Mf7
* Open. You can then make changes to the template in the Source Editor. z[cyA.
*/ f~dd3m('
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package com.tot.count; \z$p%4`E@
import tot.db.DBUtils; rSHpS`\ou
import java.sql.*; K a6,<C
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/** |d*&y#kV
* hlJq-*6'
* @author rfgI$eu
*/ E7CH^]x
public class CountControl{ Wo7F
private static long lastExecuteTime=0;//上次更新时间 >OG:vw)E
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8&Oa_{1+Q
/** Creates a new instance of CountThread */ nD)K}4
public CountControl() {} P4F3Dc
public synchronized void executeUpdate(){ {iv<w8CU)
Connection conn=null; Xy@7y[s]
PreparedStatement ps=null; 1 29q`u;
try{ =9z[[dQ|L
conn = DBUtils.getConnection(); e#Z$o($t
conn.setAutoCommit(false); Yb/i{@AJ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); tX@_fYb
for(int i=0;i<CountCache.list.size();i++){ 59%tXiO
CountBean cb=(CountBean)CountCache.list.getFirst(); wmTq` XH)
CountCache.list.removeFirst(); AwTJJ0>
ps.setInt(1, cb.getCountId()); \uXcLhXN
ps.executeUpdate();⑴ j~+>o[c
//ps.addBatch();⑵ )E,\H@A
} y-j\zK
//int [] counts = ps.executeBatch();⑶ 1xbK'i:-S
conn.commit(); w7FW^6Zl
}catch(Exception e){ Pp|*J^U 4
e.printStackTrace(); ;Wl+zw
} finally{ -,+q#F
try{ CWNx4)ZGw
if(ps!=null) { qWx][D"
ps.clearParameters(); (vB<%l.&
ps.close(); 6X\ 2GC9
ps=null; =Apxdnz,
} FI<q@HF
}catch(SQLException e){} :J:,m
DBUtils.closeConnection(conn); g =2Rqi5
} g*F '[Z."
} RtCkV xaEx
public long getLast(){ 5e}A@GyC
return lastExecuteTime; OzQ -7|m'J
} ]Lm9^q14m
public void run(){ dpFVN[\oK
long now = System.currentTimeMillis(); ,uPJ_oZs
if ((now - lastExecuteTime) > executeSep) { _^'I
//System.out.print("lastExecuteTime:"+lastExecuteTime); xritonG/F
//System.out.print(" now:"+now+"\n"); #~=hn8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); <]T` 3W9
lastExecuteTime=now; gCN$}
executeUpdate(); h?f>X"*|(
} MUA%^)#u4Q
else{ gt ";2,;X
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ylB7* >[
} m@Qt.4m%g
} X5`A GyX
} KMV=%o
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ?qX)ihe%k
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类写好了,下面是在JSP中如下调用。 n f.wCtf].
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<% ;i"*Ll>Q)
CountBean cb=new CountBean(); Y)$ ;Ax-D
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); }#qGqY*@LK
CountCache.add(cb); V %_4%
out.print(CountCache.list.size()+"<br>"); m1IKVa7-\}
CountControl c=new CountControl(); mCWhUBghR
c.run(); BA:yQ
out.print(CountCache.list.size()+"<br>"); 2PeR
%>