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: 8P*n|]B.'
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CountBean.java _CZ* z
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/* ;(afz?T
* CountData.java ]oY~8HW
* k\[2o
* Created on 2007年1月1日, 下午4:44 56)B/0=
* iZ:-V8{
* To change this template, choose Tools | Options and locate the template under QIw.`$H+
* the Source Creation and Management node. Right-click the template and choose aql*@8
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* Open. You can then make changes to the template in the Source Editor. 1a'JNe$
*/ &Ls0!dWC
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package com.tot.count; ^R\blJQ<^
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/** &M2x`
* /i"EVN`t
* @author sq^,l6es>
*/ A@#dv2JzP
public class CountBean { ?G{fF
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private String countType; b,'./{c0
int countId; ?SpI^Wn)[
/** Creates a new instance of CountData */ MT*b+&1e
public CountBean() {} 48DsRy
public void setCountType(String countTypes){ k X-AC5]
this.countType=countTypes; k >MgrtJI
} H!A^ MI
public void setCountId(int countIds){ Oe#k|
this.countId=countIds; %9Ue`8
} q^Z\V?
public String getCountType(){ M|Se|*w
return countType; "~;jFB8
} r[lHYO
public int getCountId(){ GwvxX&P
return countId; qN) cB?+
} 4$J/e?i
} QSLDA`
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CountCache.java q&M;rIo?
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/* Nr)(&c8
* CountCache.java {tM D*?C[6
* OY)x
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* Created on 2007年1月1日, 下午5:01 CV6H~t'1
* 6nwO:?1o9
* To change this template, choose Tools | Options and locate the template under md_Ld
/
* the Source Creation and Management node. Right-click the template and choose J@5 OZFMZ
* Open. You can then make changes to the template in the Source Editor. K%g\\uo
*/ OlK2<<
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package com.tot.count; {kzM*!g
import java.util.*; F,W(H@ ~x
/** H^s SHj
* \uaJw\EZ
* @author lN&GfPP6
*/ zEGwQp<
public class CountCache { gV7o
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public static LinkedList list=new LinkedList(); q8D1MEBL`
/** Creates a new instance of CountCache */ [brrziZ
public CountCache() {} @!S$gTz
public static void add(CountBean cb){ EAI[J&c
if(cb!=null){ +2g3%c0}
list.add(cb); zPXd]jIwV
} iO@wqbg$6
} ^Nu} HcC+
} (UM+?]Qwy
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CountControl.java v:>P;\]r9M
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/* HlO+^(eX
* CountThread.java Ju\"l8[f
* NX;&V7
* Created on 2007年1月1日, 下午4:57 '71btd1
* J0K"WmW
* To change this template, choose Tools | Options and locate the template under H0HYb\TX ?
* the Source Creation and Management node. Right-click the template and choose `3OGCy
* Open. You can then make changes to the template in the Source Editor.
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*/ y6s$.93
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package com.tot.count; }8SHw|-
import tot.db.DBUtils; 4EK[gM8
import java.sql.*; $X?V_K;9/
/** @|@43}M]C-
* t|q=NK/
* @author }>w;
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*/ e'6?iLpy
public class CountControl{ ..t=Y#
private static long lastExecuteTime=0;//上次更新时间 8a h]D
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 r:IU+3
/** Creates a new instance of CountThread */ OTm`i>rB
public CountControl() {} r3kI'I|bq
public synchronized void executeUpdate(){ RoTT%c P_
Connection conn=null; )t4C*+9<U
PreparedStatement ps=null; phdN9<Z
try{ c1^3lgPv
conn = DBUtils.getConnection(); p
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conn.setAutoCommit(false); +D@R'$N
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ?,NAihN]
for(int i=0;i<CountCache.list.size();i++){ oW_WW$+N
CountBean cb=(CountBean)CountCache.list.getFirst(); (nzt}i0
CountCache.list.removeFirst(); V6k9L*VP
ps.setInt(1, cb.getCountId()); `et<Z
ps.executeUpdate();⑴ U]acm\^Z
//ps.addBatch();⑵ ZKvh]
} #cs!`Ngb+
//int [] counts = ps.executeBatch();⑶ N_<n$3P\?f
conn.commit(); >O _
}catch(Exception e){ X]!@xlwF\
e.printStackTrace(); 8vo}
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} finally{ erqB/ C
try{ m";gD[m
if(ps!=null) { !S:@x.n@iR
ps.clearParameters(); D4\I;M^
ps.close(); -&?-
ps=null; /p>[$`Aq
} OK 6}9Eu9
}catch(SQLException e){} pr"flRQr#
DBUtils.closeConnection(conn); 0TpA3K
} 8`2K=`]ES+
} ;W].j%]Le
public long getLast(){ k-U/x"Pl
return lastExecuteTime; NEk [0
} =FnZk J
public void run(){ Jj " {r{
long now = System.currentTimeMillis(); #t
O!3= 0
if ((now - lastExecuteTime) > executeSep) { Pz 'Hqvd
//System.out.print("lastExecuteTime:"+lastExecuteTime); ?<;<#JN
//System.out.print(" now:"+now+"\n"); .tNB07=7
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); *v+ fkg
lastExecuteTime=now; zYL^e @
executeUpdate(); +[ zo2lBx
} To`?<]8
else{ 'UxA8i(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0"`skYJ@
} 7L*`nU|h
} 3fPv71NVtt
} A=K1T]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 MF`'r#@:wa
yKJ^hv"#
类写好了,下面是在JSP中如下调用。 YLGLr@:q
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<% H<;j&\$q
CountBean cb=new CountBean(); yH^*Fp8V
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); R 6Em^A/>
CountCache.add(cb); fm0(
out.print(CountCache.list.size()+"<br>"); Xhi?b|
CountControl c=new CountControl(); ks D1NB;9
c.run(); gL`SZr9
out.print(CountCache.list.size()+"<br>"); 0^[6
%>