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: LPsh?Ca?N
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CountBean.java F>p%2II/
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/* ~_(!}V
* CountData.java SB5@\^
* v\J!yz
* Created on 2007年1月1日, 下午4:44 o,iS&U"TC
* .n?5}s+q
* To change this template, choose Tools | Options and locate the template under Z?vY3)
* the Source Creation and Management node. Right-click the template and choose :k Rv
* Open. You can then make changes to the template in the Source Editor. Fj'\v#h
*/ *9\oD~2Y
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package com.tot.count; CR} >
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/** :DF`A(
* Y;~EcM
* @author 0tn7Rkiw
*/ Lx|w~+k}
public class CountBean { ={e#lC
private String countType; 5<0Yh#_
int countId; 18l~4"|fk
/** Creates a new instance of CountData */ yTMGISX5
public CountBean() {} M$DwQ}Z
public void setCountType(String countTypes){ #$9U=^Z[
this.countType=countTypes; b@UF
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} +9&ulr
public void setCountId(int countIds){ 'eTpcrS3
this.countId=countIds; c/,|[t
} fh/)di
public String getCountType(){ 74</6T]^
return countType; #RsIxpc
} D(W7O>5vQ2
public int getCountId(){ >QbI)if`1
return countId; Y D1g]p
} LS?` {E
} IWSEssP
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CountCache.java aTsy)=N
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/* 2n\i0?RD
* CountCache.java l% 3Q=c
* Lt
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* Created on 2007年1月1日, 下午5:01 G+%5V5GS
* a-o
hS=W
* To change this template, choose Tools | Options and locate the template under 3n=cw2FG
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. c9F[pfi(
*/ ce-m)o/
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package com.tot.count; Ib<5u
import java.util.*; aF_ZV bS
/** d%"@#bB
* VA*79I#_q
* @author tue%L]hc
*/ %d~9at6-B
public class CountCache { A/W7;D
public static LinkedList list=new LinkedList(); qhHRR/p
/** Creates a new instance of CountCache */ hwb(W?*
public CountCache() {} /m|&nl8"qe
public static void add(CountBean cb){ T[2f6[#[_
if(cb!=null){ wr6xuoH
list.add(cb); _S7M5{U_
} 4N^Qd3[d
} "$wPq@
} DG%%]
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CountControl.java %W|Zj QI^
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/* ]9l%
* CountThread.java cbHn\m)J,
* u\& [@v
* Created on 2007年1月1日, 下午4:57 ():?FJM
* jn3|9x
* To change this template, choose Tools | Options and locate the template under .TrQ +k>
* the Source Creation and Management node. Right-click the template and choose jH#^O;A
* Open. You can then make changes to the template in the Source Editor. kl<B*:RqH
*/ {UVm0AeUq
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package com.tot.count; =D:R'0YH
import tot.db.DBUtils; |
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import java.sql.*; X QoT},C
/** 7Mbt*[n
* Q)i`.mHfFI
* @author }(7QJk5 j
*/ 2/o/UfYjgF
public class CountControl{ af5`ktx
private static long lastExecuteTime=0;//上次更新时间 X;a{JjN
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 .KMi)1L)
/** Creates a new instance of CountThread */ hx;kEJ
public CountControl() {} .2- JV0
public synchronized void executeUpdate(){ .6A:t?.
Connection conn=null; K@u."eaD
PreparedStatement ps=null; .L|ax).D
try{ X!+ a;wr
conn = DBUtils.getConnection(); uNGxz*e
conn.setAutoCommit(false); SG o:FG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); aI#n+PW
for(int i=0;i<CountCache.list.size();i++){ |MR?8A^"
CountBean cb=(CountBean)CountCache.list.getFirst(); p?NjxQLA
CountCache.list.removeFirst(); ~O7(0RsCN
ps.setInt(1, cb.getCountId()); 4E(5Ccb
ps.executeUpdate();⑴ Y,"MQFr(o
//ps.addBatch();⑵ :NyE d<'
} aw~EK0yU
//int [] counts = ps.executeBatch();⑶ NS~knR\&
conn.commit(); swgBPJ"?
}catch(Exception e){ JX<W[P>M
e.printStackTrace(); QYb?;Z
} finally{ -Dm.z16
try{ 6(^9D_"@
if(ps!=null) { >RnMzH/9
ps.clearParameters(); ?YykCJJ ~@
ps.close(); Oo .Qz
ps=null; 9(.9l\h
} =eLb"7C#0
}catch(SQLException e){} z$5C(! )
DBUtils.closeConnection(conn); JB_`lefW,'
} OIT;fKl9
} u@'zvkb@
public long getLast(){ GLF"`M /g
return lastExecuteTime; .4(f0RG
} Y"%o\DS*
public void run(){ GP'Y!cl
long now = System.currentTimeMillis(); nGd
if ((now - lastExecuteTime) > executeSep) { jdf@lb=5l
//System.out.print("lastExecuteTime:"+lastExecuteTime); Y@Y(;C"SW
//System.out.print(" now:"+now+"\n"); W-QPO
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^eRT8I
lastExecuteTime=now; [wG%@0\
executeUpdate(); p00AcUTq
} BF!zfX?n
else{ 2H "iN[2A
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !l^AKn|
} ybO,~TQ
} {jf~?/<
} A$6b=2hc>
//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 59]9-1" +
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类写好了,下面是在JSP中如下调用。 Zx 1z
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<% J@iN':l-
CountBean cb=new CountBean(); 4]
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); = h( n+y<
CountCache.add(cb); < z)G& h@
out.print(CountCache.list.size()+"<br>"); w\*/(E<:
CountControl c=new CountControl(); 7k|(5P;
c.run(); H/Q)zDP
out.print(CountCache.list.size()+"<br>"); NM.B=<Aw*
%>