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: f.'o4HSj
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CountBean.java Qo{^jDe,c*
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/* K)0 6][,
* CountData.java jvm
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* ipKkz
* Created on 2007年1月1日, 下午4:44 "$:nz}
* W?R$+~G
* To change this template, choose Tools | Options and locate the template under F1|4([-<]
* the Source Creation and Management node. Right-click the template and choose ({zp$P}
* Open. You can then make changes to the template in the Source Editor. ;nv4lxm
*/ :ZU
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package com.tot.count; "Rs^0iT7>
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/** sbNCviKP
* T0RgCU
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* @author +|(
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*/ x_(B7ob
public class CountBean { NCSb`SC:
private String countType; /tP"r}l
int countId; !OWV* v2
/** Creates a new instance of CountData */ 4y21v|(9
public CountBean() {} C`knFGb
public void setCountType(String countTypes){ CWI(Q`((>
this.countType=countTypes; }(TZ}* d
} F K={%
public void setCountId(int countIds){ S)$ES6]9/
this.countId=countIds; v=SC*
} Pd^ilRB
public String getCountType(){ -\>Bphu,y
return countType; ";",r^vr\
} Fz)z&WT
public int getCountId(){ t_@%4Wn!1L
return countId; eVbHPu4
} c+|,2e
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} %qfEFhRC
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CountCache.java I#S6k%-'
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/* {n%F^ky+7
* CountCache.java Ql\{^s+
* K-_e' )22.
* Created on 2007年1月1日, 下午5:01 RpS'Tz}
* ,1F3";`n[
* To change this template, choose Tools | Options and locate the template under O&\;BF5:R
* the Source Creation and Management node. Right-click the template and choose aCFO]
* Open. You can then make changes to the template in the Source Editor. 0=(5C\w2
*/ ?exV:OKLb
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package com.tot.count;
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import java.util.*; k9WihejS
/** LfrS:g
* &HZ"<y{j
* @author 7PP76$
*/ .wS' Xn&
public class CountCache { xk.\IrB_
public static LinkedList list=new LinkedList(); }3^t,>I=,6
/** Creates a new instance of CountCache */ Scs \nF2
public CountCache() {} B7T(9Tj+Fh
public static void add(CountBean cb){ A'6>"=ziP
if(cb!=null){ 9)T;.O
list.add(cb); w]F (o
} $xlI"-(
} OZLU>LU
} MBDu0
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CountControl.java 0j4bu}@
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/* d^WVWk K
* CountThread.java 8TC%]SvYim
* FrB}2
* Created on 2007年1月1日, 下午4:57 0D:J d6\
* 86@"BNnTh
* To change this template, choose Tools | Options and locate the template under )aOg_*~
* the Source Creation and Management node. Right-click the template and choose srJ,Jr(
* Open. You can then make changes to the template in the Source Editor. t#}/VnSQ
*/ "DfvoQ P
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package com.tot.count; _~=X/I R
import tot.db.DBUtils; ,S}[48$
import java.sql.*; x(5>f9b b
/** UFm E`|le
* &D>e>]E|P
* @author |zGwt Z
*/ 70a7}C\/o
public class CountControl{
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private static long lastExecuteTime=0;//上次更新时间 7oh6G
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]6W#P7
/** Creates a new instance of CountThread */ B.;/N220P
public CountControl() {} -`FTWH
public synchronized void executeUpdate(){ >j_,3{eJ
Connection conn=null; TR5"K{WDx
PreparedStatement ps=null; :_i1)4[!
try{ j!qO[CJJ
conn = DBUtils.getConnection(); +KrV!Taf
conn.setAutoCommit(false); 70mQ{YNN
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); B@=+Fg DD
for(int i=0;i<CountCache.list.size();i++){ VLA9&.*@
CountBean cb=(CountBean)CountCache.list.getFirst(); D%Hz'G0|
CountCache.list.removeFirst(); u==bLl=$
ps.setInt(1, cb.getCountId()); ;:hyW,J
ps.executeUpdate();⑴ +JB. EW/
//ps.addBatch();⑵ 2YdMsu~
} <IGnWAWn
//int [] counts = ps.executeBatch();⑶ /Rb`^n#
conn.commit(); DL_2%&k/
}catch(Exception e){ =Qp~@k=2
e.printStackTrace(); | ?~-k[|
} finally{ |Ah26<&