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: Tw-NIT)
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CountBean.java F!X0Wo=
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/* <e UsMo<
* CountData.java H7+"BWc
* j-K[]$
* Created on 2007年1月1日, 下午4:44 H^-Y]{7
* kPX+n+$
* To change this template, choose Tools | Options and locate the template under `H! (hMMV
* the Source Creation and Management node. Right-click the template and choose E+ /Nicn=
* Open. You can then make changes to the template in the Source Editor. I/(U0`%
*/ p7|I>8ur.
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package com.tot.count; hi"C<b.
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/** {?`rGJ{f
* .b";7}9{
* @author MN<LZC%$
*/ eke[{%L
public class CountBean { +
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private String countType; IS]A<}j/-
int countId; HUx`RX0>
/** Creates a new instance of CountData */ b=EI?XwJ
public CountBean() {} !P{ /;Q
public void setCountType(String countTypes){ 2_wpj;E
this.countType=countTypes; *HD(\;i-$
} ZN}`A7
public void setCountId(int countIds){ #f#6u2nF\
this.countId=countIds; +^BThrB
} d#T5=5#
public String getCountType(){ cP?GRMX@}
return countType; li%@HdA!
} %NkiY iA
public int getCountId(){ N*A*\B%{x'
return countId; Iy_5k8]
} AZ!/{1 Az
} AW r2Bv
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CountCache.java hrKeOwKHU
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/* WXxnOLJr
* CountCache.java 2Z{?3mAb;
* ,WE2.MWR
* Created on 2007年1月1日, 下午5:01 `/WxEu3
* C|]c#X2t3
* To change this template, choose Tools | Options and locate the template under VrW]|jIu*
* the Source Creation and Management node. Right-click the template and choose ]|3hK/
* Open. You can then make changes to the template in the Source Editor. }[eUAGhDU
*/ 3V]dl)en%
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package com.tot.count; OmBM)g
import java.util.*; q_[y|ETJ]
/** ]+e
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* (3N/DY1/
* @author 5J`w8[;
*/ %X_A# 9
public class CountCache { h!wq&Vi4
public static LinkedList list=new LinkedList(); CNRSc4Le
/** Creates a new instance of CountCache */ W<q<}RSn
public CountCache() {} %i?
public static void add(CountBean cb){ Py*WHHO
if(cb!=null){ bg|$1ue
list.add(cb); j*QdD\)
} ZW;Ec+n_K
} Qy9_tvq
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} :0@0muo
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CountControl.java 4]1/{</B|
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/* xtGit}
* CountThread.java J;>;K6pW
* q!W,2xqZoq
* Created on 2007年1月1日, 下午4:57 ILCh1=?{9r
* al#(<4sJ
* To change this template, choose Tools | Options and locate the template under ?J$k
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* the Source Creation and Management node. Right-click the template and choose #_ulmB;
* Open. You can then make changes to the template in the Source Editor. Ho(MO!(
*/ \L>XF'o
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package com.tot.count; (g;O,`|c,
import tot.db.DBUtils; -|'@:cIZ
import java.sql.*; -Jd7
/** Z+V%~C1
* W)1nc"WqY
* @author ^X_ ;ZLg.
*/ OX.5olb
public class CountControl{ kVLZdXn,q2
private static long lastExecuteTime=0;//上次更新时间 | K|AUI
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 y3j$?oM
/** Creates a new instance of CountThread */ Jm ,:6T
public CountControl() {} FTUfJIVN(
public synchronized void executeUpdate(){ t!wbT79/
Connection conn=null; pOK=o$1V8
PreparedStatement ps=null; X(Af`KOg[
try{ 6Zpa[,gm
conn = DBUtils.getConnection(); ot7f?tF2<J
conn.setAutoCommit(false); to13&#o
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !9gpuS[
for(int i=0;i<CountCache.list.size();i++){ #TUm&2 +V
CountBean cb=(CountBean)CountCache.list.getFirst(); SkV pZh
CountCache.list.removeFirst(); vgc~%k62c
ps.setInt(1, cb.getCountId()); Yjo$vQi
ps.executeUpdate();⑴ <nJGJ5JJ
//ps.addBatch();⑵ QH><!
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} VP< zOk7
//int [] counts = ps.executeBatch();⑶ 6MOwn*%5k
conn.commit(); ecm+33C
}catch(Exception e){
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e.printStackTrace(); iOm&(2/
} finally{ 3T(ft^~
try{ !_Y%+Rkp0
if(ps!=null) { b w1s?_P
ps.clearParameters(); 3^Is4H_8
ps.close(); G l/3*J
ps=null; fV9+FOZn
} )2"WC\%
}catch(SQLException e){} 7/&t