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: wW'.bqA
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CountBean.java ltmD=-]G_
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/* 4{ exv
* CountData.java IS }U2d,W
* 6NzS <
* Created on 2007年1月1日, 下午4:44 VI^~I;M^
* ltXGm)+
* To change this template, choose Tools | Options and locate the template under 'J#uD|9)
* the Source Creation and Management node. Right-click the template and choose ]"\XTL0
* Open. You can then make changes to the template in the Source Editor. OMN|ea.O
*/ (:J
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package com.tot.count; F}_Zh9/$(
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/** ;Q%3WD
* fZJ O}
* @author uWerC?da
*/ #'h(o/hz&&
public class CountBean { :<E\&6# oC
private String countType; M9sB2Ips<
int countId; Zq"wq[GCN
/** Creates a new instance of CountData */ 15`,kJSK
public CountBean() {} 0'tm.,
public void setCountType(String countTypes){ .[X"+i\
this.countType=countTypes; zH?&FtO
} 8*yky
public void setCountId(int countIds){ <<9Y=%C+
this.countId=countIds; >oc&hT
} 3ocRq
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public String getCountType(){ Zl`sY5{1
return countType; O7tL,)Vv
} 55|.MXzq
public int getCountId(){ z`rW2UO#a`
return countId; ~qmu?5
} +\`t@Ht#
} |m>n4-5QL
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CountCache.java cK+y3`.0
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/* $;%dQ!7*
* CountCache.java z6Jfu:_N!
* x<e-%HB*-
* Created on 2007年1月1日, 下午5:01 X~Vr}
* Y=N; Bj
* To change this template, choose Tools | Options and locate the template under f Tc,"{
* the Source Creation and Management node. Right-click the template and choose qfzT8-Y
* Open. You can then make changes to the template in the Source Editor. V{G9E
*/ =D~RIt/D
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package com.tot.count; *Ad7GG1/u
import java.util.*; 0^{?kg2o_
/** 7Y(ySW
* 6M758K6v
* @author #ZRplA~C7]
*/ vVi))%&S(
public class CountCache { A/"p PO
public static LinkedList list=new LinkedList(); ]w=6.LzO*
/** Creates a new instance of CountCache */ S4Vv _k-&
public CountCache() {} )vFZl]
public static void add(CountBean cb){ \aO.LwYm;:
if(cb!=null){ U)N_/
list.add(cb); p@7[w@B\c
} %Sdzr!I7*
} y3O Nn~k
} B:\TvWbu
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CountControl.java !*gTC1bvB
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/* (g@e=m7Q
* CountThread.java 8\^[@9g3\3
* Bu$GC SrX
* Created on 2007年1月1日, 下午4:57 _8'F I_E3
* 9GZKT{*
* To change this template, choose Tools | Options and locate the template under oGLSk(T&I
* the Source Creation and Management node. Right-click the template and choose 9)qjW &`
* Open. You can then make changes to the template in the Source Editor. ,{{uRs/
*/ X=p~`Ar M{
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package com.tot.count; WqC6c&NM
import tot.db.DBUtils; \8!&XcA
import java.sql.*; hsQrHs'k
/** 9J?G"JV?
* "]nbM}>
* @author { [4Y(l1
*/ <'4DMZ-G
public class CountControl{ {O,Cc$_
private static long lastExecuteTime=0;//上次更新时间 BK'!WX
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -< 7KW0CA
/** Creates a new instance of CountThread */ e.0vh?{\
public CountControl() {} 8<t?o'9I
public synchronized void executeUpdate(){ 8fdK|l w
Connection conn=null; t$=0 C
PreparedStatement ps=null; iw(\]tMt
try{ +6!.)Ea=
conn = DBUtils.getConnection(); )(&g\
conn.setAutoCommit(false); gTR:9E:B
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Qko}rd_M
for(int i=0;i<CountCache.list.size();i++){ A]{8=
CountBean cb=(CountBean)CountCache.list.getFirst(); 6!i0ioZzi0
CountCache.list.removeFirst(); y= ILA
ps.setInt(1, cb.getCountId()); =ot`V; Q>
ps.executeUpdate();⑴ xnu|?;.}!
//ps.addBatch();⑵ KW.S)+<H&
} I/GZ
//int [] counts = ps.executeBatch();⑶ UG+wRX :dA
conn.commit(); hSD)|
}catch(Exception e){
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e.printStackTrace(); ]P ->xJ
} finally{ WZCX&ui