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: (u='&ka
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CountBean.java D
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/* qUn+1.[%
* CountData.java .LnknjC
* mb%U~Na
* Created on 2007年1月1日, 下午4:44
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* Aeo=m}C;
* To change this template, choose Tools | Options and locate the template under 9x8Vsd
* the Source Creation and Management node. Right-click the template and choose '{.8tT?tJ
* Open. You can then make changes to the template in the Source Editor. M^hz<<:$
*/
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package com.tot.count; Bu?Qyz2O
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/** {.;qz4d`
* hM>.xr
* @author N_Zd.VnY
*/ %~>-nqS
public class CountBean { 4M6[5RAW{
private String countType; w-NTw2x,&
int countId; Tdz#,]Q
/** Creates a new instance of CountData */ 5DkEJk7a
public CountBean() {} "3a}~J<g
public void setCountType(String countTypes){ ?|
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this.countType=countTypes; Y%|dM/a`
} [7LdTY"Tl
public void setCountId(int countIds){ D,lY_6=
this.countId=countIds; 5Fj9.K~k
} Dbq/t^
public String getCountType(){ 2|WM?V&
return countType; fU$_5v4
} 59"tHb6 E
public int getCountId(){ >LH}A6dUC
return countId; &RI;!qn6(
} .j>MsQP#\C
} Q7d@+C
<%rm?;PBl
CountCache.java G$QN_h,}
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/* :V@)A/}uk
* CountCache.java PDz:x4A
* UlNV%34"
* Created on 2007年1月1日, 下午5:01 mI:^lp
* R7!v=X]i
* To change this template, choose Tools | Options and locate the template under ?2\oi*$
* the Source Creation and Management node. Right-click the template and choose Qgv g*KX
* Open. You can then make changes to the template in the Source Editor. D/;[x{;E
*/ hn/yX|4c(
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package com.tot.count; Ai^0{kF6
import java.util.*; JL{fW>5y|
/** J~oxqw}
* 2dHsM'ze
* @author x'OP0],#
*/ 3 p?nQ
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public class CountCache { C+%eT&OO
public static LinkedList list=new LinkedList(); [?qzMFb
/** Creates a new instance of CountCache */ [kckE-y
public CountCache() {} vifw
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public static void add(CountBean cb){ ^Oeixi@f
if(cb!=null){ v]H9`s#,
list.add(cb); MA}}w&
} >LN*3&W
} ._<,
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} +uTl
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CountControl.java >Bdh`Ot-!
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/* @#-\BQ;
* CountThread.java -Lb7=98
* i:jB
* Created on 2007年1月1日, 下午4:57 Dsc0;7~6
* njO~^Hl7
* To change this template, choose Tools | Options and locate the template under G!G:YVWXP
* the Source Creation and Management node. Right-click the template and choose :2/jI:L~
* Open. You can then make changes to the template in the Source Editor. .}Ys+d1b9c
*/ E`hR(UL
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package com.tot.count; x2r.4
import tot.db.DBUtils; W\5 -Yg(@
import java.sql.*; mpVD;)?JmM
/** G`Z<a
* PlK3;
* @author 7zA+UWr
*/ mO(Y>|mm
public class CountControl{ so/0f1R?~
private static long lastExecuteTime=0;//上次更新时间 J|^z>gP(
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mh`uvqY
/** Creates a new instance of CountThread */ ur=:Ha
public CountControl() {} zxH<~2
public synchronized void executeUpdate(){ 0 z]H=
Connection conn=null; JP5en
PreparedStatement ps=null; UIg?3J}R
try{ KsK]y,^Z
conn = DBUtils.getConnection(); ;3xi.^=B
conn.setAutoCommit(false); gy~2LY !}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); `-R&4%t%
for(int i=0;i<CountCache.list.size();i++){ v}D0t]
CountBean cb=(CountBean)CountCache.list.getFirst(); *QIYq
CountCache.list.removeFirst(); I&gd"F _v}
ps.setInt(1, cb.getCountId()); b!Nr
ps.executeUpdate();⑴ a~LdcUYs
//ps.addBatch();⑵ ST~YO
} pFZ$z?lI
//int [] counts = ps.executeBatch();⑶ TX@ed
conn.commit(); 9^`cVjD5
}catch(Exception e){ &,:!gYN
e.printStackTrace(); zxD=q5in
} finally{ [Ob'E!;<
try{ L+T7Ge
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if(ps!=null) { "L1LL
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ps.clearParameters(); ?TIi0;h
ps.close(); 55UPd#E'
ps=null; K :+q9;g
} i+< v7?:`#
}catch(SQLException e){} T<b*=i
DBUtils.closeConnection(conn); yJO Jw o^
} $cwmfF2C
} !$ii*}
public long getLast(){ =h
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return lastExecuteTime; }Qe(6'l_
} A:2CP&*
public void run(){ + @|u8+
long now = System.currentTimeMillis(); W/ WP }QM
if ((now - lastExecuteTime) > executeSep) { e6tU8`z
//System.out.print("lastExecuteTime:"+lastExecuteTime); (: kn)
//System.out.print(" now:"+now+"\n"); m_Z(osoE#W
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); h&v].l
lastExecuteTime=now; 2_o\Wor#
executeUpdate(); 9) $[W
} U:eX^LE7
else{ <SOG?Lh~
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ,{msJyacmR
} d)D!np=
} &m[}%e%~0
} !g}@xwWax
//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 |O'*CCrCL
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类写好了,下面是在JSP中如下调用。 tq@)J_7|
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<% -%P}LaC<
CountBean cb=new CountBean(); h8Oj
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); J(maJuY
CountCache.add(cb); \ Ucv<S
out.print(CountCache.list.size()+"<br>"); cXf/
CountControl c=new CountControl(); '+j;g
c.run(); llh
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out.print(CountCache.list.size()+"<br>"); |M
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