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: },n?
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CountBean.java fB80&G9
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/* vPz$+&{I
* CountData.java #M%K82"
* ,,SV@y;
* Created on 2007年1月1日, 下午4:44 KomMzG:
* qnCjNN
* To change this template, choose Tools | Options and locate the template under ?3lAogB
* the Source Creation and Management node. Right-click the template and choose [~PR\qm
* Open. You can then make changes to the template in the Source Editor. -Bl]RpHCe
*/ ~-<MoCm!
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package com.tot.count; uNkJe
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/** B0U(B\~Y
* PB
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* @author +OqEe[Wk#
*/ Gx
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public class CountBean { GE`1j'^-
private String countType; [GPCd@
int countId; U
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/** Creates a new instance of CountData */ G^N@r:RS
public CountBean() {} w3ATsIw
public void setCountType(String countTypes){ "u]&~$
this.countType=countTypes; %3O))Ug5
} DuNindo8
public void setCountId(int countIds){ J/fnSy
this.countId=countIds; wZZ~!"O&
} /o%VjP"<
public String getCountType(){ Fgi`g{N
return countType; Unv'm5/L
} Ui!l3_O
public int getCountId(){ cF4,dnI
return countId; Ml$<x"Q
} S2DG=hi`GK
} Q^ZM| (s#
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CountCache.java 76"4Q!
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/* i(pHJP:a:
* CountCache.java h}!9?:E
* ~uH_y-
* Created on 2007年1月1日, 下午5:01 g0bYO!gCr
* 6F!B*lr
* To change this template, choose Tools | Options and locate the template under (ix.
* 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. lyX3'0c
*/
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package com.tot.count; ]VxC]a2
import java.util.*; hO&b\#@~
/** y/y~<-|<@
* vjS=ZinN"
* @author u1L^INo/
*/
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public class CountCache { C<AW)|r_
public static LinkedList list=new LinkedList(); Qw:!Rw,x
/** Creates a new instance of CountCache */ (z>t 4(%\
public CountCache() {} \?>M?6D
public static void add(CountBean cb){ Kc?4q=7q
if(cb!=null){ chKK9SC+|
list.add(cb); 5gtf`ebs/
} jtlRom}
} T"[]'|'
} _0v+'&bz
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CountControl.java itP`{[
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/* X0u,QSt'O
* CountThread.java +ZM,E8
* NDP"
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* Created on 2007年1月1日, 下午4:57 ,JE_aje7
* (_zlCHB
* To change this template, choose Tools | Options and locate the template under 3{$7tck,
* the Source Creation and Management node. Right-click the template and choose /@k#tdj
* Open. You can then make changes to the template in the Source Editor. ![^pAEgx
*/ X n$ZA-
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package com.tot.count; Ha `N
import tot.db.DBUtils; 7Hr_ZwO/^
import java.sql.*; ![\-J$
/** ~2"hh$
* L"|Bm{Run
* @author [|OII!"
*/ n?.; *:
public class CountControl{ w!7ApEH1
private static long lastExecuteTime=0;//上次更新时间 aX^T[
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 PlGif)
/** Creates a new instance of CountThread */ Bzrnmz5S
public CountControl() {} KOS0Du
public synchronized void executeUpdate(){ Kd`(^
Connection conn=null; Ev5~= ]
PreparedStatement ps=null; ,2nu*+6Y/
try{ /RxP:>hVv
conn = DBUtils.getConnection(); z#GZb
conn.setAutoCommit(false); cRVL1ne
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $V(]z`b&
for(int i=0;i<CountCache.list.size();i++){ 2bNOn%!
CountBean cb=(CountBean)CountCache.list.getFirst(); HeAXZA,
CountCache.list.removeFirst(); /h0bBP
ps.setInt(1, cb.getCountId()); |6*Bu1
ps.executeUpdate();⑴ 1.cP3kl
//ps.addBatch();⑵ m}uOBR+
} Cg):
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//int [] counts = ps.executeBatch();⑶ 2h
conn.commit(); }`B
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}catch(Exception e){ I9S;t_Z<
e.printStackTrace(); jmID@37t
} finally{ {Yj5Mj|#
try{ h=7q;-@7
if(ps!=null) { mVZh_R=a
ps.clearParameters(); " CT}34l
ps.close(); gF{ehU%
ps=null; }=^ ,c
} y|5s
}catch(SQLException e){} OyZR&,q
DBUtils.closeConnection(conn); +.V+@!
} tK%ie\
} $Z@*!B^
public long getLast(){ G)Gp}4gV}
return lastExecuteTime; :\OSHs<M
} _Op%H)
public void run(){ ] 3{t}qY$A
long now = System.currentTimeMillis(); )7>GXZG>=
if ((now - lastExecuteTime) > executeSep) { f^$,;
//System.out.print("lastExecuteTime:"+lastExecuteTime); )d2Z g
//System.out.print(" now:"+now+"\n"); "6f`hy
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Y !<m8\
lastExecuteTime=now; "I.6/9
executeUpdate(); 9F/I",EA
} aA`eKy) \
else{ UBaXS_c\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3oCI1>k
} ~:a1ELqVw
} 3B1\-ry1M
} 75# 8P?i
//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 0'Pjnk-i
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类写好了,下面是在JSP中如下调用。 @{y'_fw
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<% yfG;OnkZ
CountBean cb=new CountBean(); *g(d}C!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); -r\jIO_
CountCache.add(cb); [6!k:-t+
out.print(CountCache.list.size()+"<br>"); LDlYLsF9
CountControl c=new CountControl(); P<]U
c.run(); uavATnGO{B
out.print(CountCache.list.size()+"<br>"); gu
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