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: @pYEzizP7
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CountBean.java *$vH]>)p
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/* &R%'s1]o
* CountData.java _/I">/ivlM
* rYr*D[m]
* Created on 2007年1月1日, 下午4:44 R03 Te gwA
* Df^F)\7!N?
* To change this template, choose Tools | Options and locate the template under , [|aWT%9
* the Source Creation and Management node. Right-click the template and choose [^5;XD:%&l
* Open. You can then make changes to the template in the Source Editor.
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*/ RTm/-6[N
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package com.tot.count; Q-
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/** $mn0I69
* 06S
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* @author AzOs/q8O
*/ LTTMa-]Yy
public class CountBean { @vt.Db
private String countType; ;XurH%Mg
int countId; -d\sKc
/** Creates a new instance of CountData */ (.ir"\k1(
public CountBean() {} 3T2]V?
public void setCountType(String countTypes){ AI.(}W4]
this.countType=countTypes; n:%4SZn
} }uZs)UQ|$
public void setCountId(int countIds){ y QW7ng7D0
this.countId=countIds; \l~^dn}
} RRIh;HhX
public String getCountType(){ [k6I#v<&
return countType; ?;ok9Y
} G.rz6o;
public int getCountId(){ <e2l@@#oy
return countId; $^ws#}j
} Q 7_5
} 3f[Yk#"
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CountCache.java aOwjYl[?p
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/* B.q/}\
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* CountCache.java Ktq 4b%{
* hx:q@[ +J/
* Created on 2007年1月1日, 下午5:01 Re,;$_6o
* /;*_[g5*i
* To change this template, choose Tools | Options and locate the template under /4&gA5BS]
* the Source Creation and Management node. Right-click the template and choose 1!<t8,W4
* Open. You can then make changes to the template in the Source Editor. @8|*Ndx2
*/ s?w2^<P
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package com.tot.count; [eX]x
import java.util.*; rAH!%~
/** bhqSqU}6~
* h_%q`y ,
* @author .^Sglo
*/ VeYT[Us"
public class CountCache { 7IX8ck[D
public static LinkedList list=new LinkedList(); v>8C}d^
/** Creates a new instance of CountCache */ OETo?Wg1Z
public CountCache() {} 3p0v
public static void add(CountBean cb){ >h\y1IrAaG
if(cb!=null){ Eomfa:WL
list.add(cb); 7D6`1&
} {&=+lr_h?
} YB 38K(
} 3p%e_?
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CountControl.java mmTpF]t
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/* @J[@Pu O
* CountThread.java :@(('X(".
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* Created on 2007年1月1日, 下午4:57 tT}b_r7h(1
* jn<?,UABD
* To change this template, choose Tools | Options and locate the template under uX_H;,n
* the Source Creation and Management node. Right-click the template and choose o(*\MTt?
* Open. You can then make changes to the template in the Source Editor. `6Bx8CZ'I
*/ x4MmBVqp
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package com.tot.count; v e&d"8+]
import tot.db.DBUtils; 7>N~l
import java.sql.*; |P
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/** 'f5
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* @author K:,V>DL
*/ xfYKUOp/
public class CountControl{ Qs&;MW4q
private static long lastExecuteTime=0;//上次更新时间 G4*
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 m\&|#yq
/** Creates a new instance of CountThread */ a-{|/
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public CountControl() {} ingG
public synchronized void executeUpdate(){ {VcRur}&Y8
Connection conn=null; =zkN63S
PreparedStatement ps=null; -DI
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try{ GX>8B:]o|
conn = DBUtils.getConnection(); m5K?oV@n
conn.setAutoCommit(false); 9&lemz
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); r48|C{je-
for(int i=0;i<CountCache.list.size();i++){ f3K-X1`]'U
CountBean cb=(CountBean)CountCache.list.getFirst(); 7(Fas(j3
CountCache.list.removeFirst(); 586P~C[ic
ps.setInt(1, cb.getCountId()); 1djZ5`+
ps.executeUpdate();⑴ h^Wb<O`S
//ps.addBatch();⑵ zI`I
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} [:8\F#KW
//int [] counts = ps.executeBatch();⑶ 19E(Hsz
conn.commit(); ^O07GYF
}catch(Exception e){ r,6~%T0
e.printStackTrace(); > mb}~wx`
} finally{ F&d!fEHU
try{ U=Ps#
if(ps!=null) { M\]lNQ A
ps.clearParameters(); i|eX X)$
ps.close(); X +`Dg::
ps=null; Na0^csPm
} %U\,IO `g
}catch(SQLException e){} [l}H:%O,
DBUtils.closeConnection(conn); Hjm> I'9
} c]6b|mHT
} 6S`_L
public long getLast(){ \<7Bx[/D4
return lastExecuteTime; x~e._k=
} 5X{|*?>T
public void run(){ *u},(4Qf
long now = System.currentTimeMillis(); m<CrkKfpG
if ((now - lastExecuteTime) > executeSep) { 7^eyO&4z
//System.out.print("lastExecuteTime:"+lastExecuteTime); JipNI8\r
//System.out.print(" now:"+now+"\n"); %3z[;&*3O
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^ja]e%w#
lastExecuteTime=now; yXNr[7
executeUpdate(); Q]WBH_j
} :?M_U;;z2+
else{ DQG%`-J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); GcV/_Y
} qc8Ge\3s
} x3+
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} 20c5U%
//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 @:N8V[*u
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类写好了,下面是在JSP中如下调用。 Mu3G/|t(
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<% 'O<b'}-A
CountBean cb=new CountBean(); q[s,q3n~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \{h_i
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CountCache.add(cb); Zbczbnj
out.print(CountCache.list.size()+"<br>"); &g:( I
CountControl c=new CountControl(); kWr1>})'
c.run(); U0&myj 8L
out.print(CountCache.list.size()+"<br>"); _Ewh:IM-
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