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: 5nq-b@?L
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CountBean.java }t-|^mY>
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/* >qvD39w
* CountData.java ujqktrhuLb
* W1`ZS*12D
* Created on 2007年1月1日, 下午4:44 BvR3Oi@Wc
* 5o ^=~
* To change this template, choose Tools | Options and locate the template under qWRMwvN{
* 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. 7Ej#7\TB]
*/ L5uI31
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package com.tot.count; Y1+lk^
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/** ^ 6|"=+cO\
* hD"~
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* @author SZD2'UaG
*/ h5keYBA
public class CountBean { 9d}nyJ
private String countType; 8J1.(Mwb?
int countId; J*C*](
/** Creates a new instance of CountData */ ]LOtwY
public CountBean() {} IEf^.Z
public void setCountType(String countTypes){ :{Z^ _;Tf
this.countType=countTypes; h*Tiv^a
} ]qHO{b4k
public void setCountId(int countIds){ vkgL"([_
this.countId=countIds; Q^w]Nj(e_
} pdiZ"pe
public String getCountType(){ ve^MqW&S
return countType; =V
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} 97dI4t<
public int getCountId(){ <F
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return countId; 'B6H/d>
} +[[gU;U"v
} x,_Ucc.
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CountCache.java uhLmyK
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/* }TL"v|ny6;
* CountCache.java bM3e7olWS
* AR3=G>hO,
* Created on 2007年1月1日, 下午5:01 L"/ato
* e,UgTxZ
* To change this template, choose Tools | Options and locate the template under ^D[;JV
* the Source Creation and Management node. Right-click the template and choose i=QhXCM
* Open. You can then make changes to the template in the Source Editor. iUB ni&B
*/ ttVSgKAsm
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package com.tot.count; o2jB~}VMl
import java.util.*; hDMp^^$
/** =oDrN7`,B
* "iGc'?/+
* @author -h`0v
*/ n#/m7
public class CountCache { our5k
public static LinkedList list=new LinkedList(); 3R.cj
/** Creates a new instance of CountCache */ fBOG#-a}
public CountCache() {} P'~3WL4MKs
public static void add(CountBean cb){ s%|J(0
if(cb!=null){ `BD`pa7.%
list.add(cb); gMn)<u >
} jQ}|]pj+
} V= PoQ9d
} \YS\*'F
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CountControl.java _Y {g5t
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/* _*I6O$/>
* CountThread.java 1Tr=*b %f
* yQ50f~9
* Created on 2007年1月1日, 下午4:57 Y))sk-
* vq:j?7
* To change this template, choose Tools | Options and locate the template under 6si-IJ
* the Source Creation and Management node. Right-click the template and choose r
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* Open. You can then make changes to the template in the Source Editor. p\\q[6
*/ pE,BE%
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package com.tot.count; JN)t'm[kyE
import tot.db.DBUtils; W:J00rsv=`
import java.sql.*; d*HAKXd&:j
/** JH#+E04#
* N> Y3[G+
* @author iwJgU
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*/ ^)~M,rW8c
public class CountControl{ 8<!9mgh
private static long lastExecuteTime=0;//上次更新时间 UUq9UV-h
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 bmpB$@
/** Creates a new instance of CountThread */ e:
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public CountControl() {} ,#loVLy
public synchronized void executeUpdate(){ .*"IJD9
Connection conn=null; &ii
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PreparedStatement ps=null; ^pa).B.`T
try{
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conn = DBUtils.getConnection(); jN0v<_PJED
conn.setAutoCommit(false); w2L)f,X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); etVE8N'
for(int i=0;i<CountCache.list.size();i++){ e>.xXg6Zn
CountBean cb=(CountBean)CountCache.list.getFirst(); 5H5Kt9DoW
CountCache.list.removeFirst(); C@i g3fhV
ps.setInt(1, cb.getCountId()); s2WB4Uk
ps.executeUpdate();⑴ ps{(UYM=b
//ps.addBatch();⑵ VuW19-G
} r_m&Jl@4
//int [] counts = ps.executeBatch();⑶ [:qX3"B
conn.commit(); jo~vOu
}catch(Exception e){ ?dYDfyFfB
e.printStackTrace(); ntejFy9_
} finally{ ^*OA%wg3=h
try{ tEj5WEnNE8
if(ps!=null) { n>UvRn.7kz
ps.clearParameters(); 7Wu2gky3
ps.close(); =@>&kU%$&
ps=null; \
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} B?'ti{p
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}catch(SQLException e){} RJSgts "F
DBUtils.closeConnection(conn); /'&LM\
} sJWwkR
} [geY:v_B
public long getLast(){ e|P60cd /
return lastExecuteTime; VrK 5a9*^
} f
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public void run(){ P.Bk-#}$
long now = System.currentTimeMillis(); 4dP_'0]9A:
if ((now - lastExecuteTime) > executeSep) { )LG/n
//System.out.print("lastExecuteTime:"+lastExecuteTime); Y'T#
//System.out.print(" now:"+now+"\n"); p
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6BnjT
lastExecuteTime=now; xT/&'$@{)
executeUpdate(); W +E2({
} &AVi4zV
else{ zl5S)/A
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3^Y-P8.zdB
} ^8iy(
} ITV}f#
} J,7\/O(`A
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 vY6|V$
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类写好了,下面是在JSP中如下调用。 'e@}N)IX
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<% NO1PGen
CountBean cb=new CountBean(); s5HbuyR^
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 7^F?key?
CountCache.add(cb); LFC k6 R
out.print(CountCache.list.size()+"<br>"); >+r2I%
CountControl c=new CountControl(); 6FE[snw
c.run(); tdm /U
out.print(CountCache.list.size()+"<br>"); VbjFQ@[l!
%>