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: CAe!7HiR
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CountBean.java Zc yc*{DS
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/* i?/qY&~
* CountData.java q| 7(
* ==B6qX8T
* Created on 2007年1月1日, 下午4:44 ,I9bNO,%JK
* BWNi [^]
* To change this template, choose Tools | Options and locate the template under >eaaaq9B-
* the Source Creation and Management node. Right-click the template and choose so;
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* Open. You can then make changes to the template in the Source Editor. G5!^*jf
*/ \^LFkp
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package com.tot.count; vIvIfE
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/** =*Lfl'sr_
* *hrvYil2b
* @author teP<!RKNb
*/ t7pFW^&
public class CountBean {
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private String countType; t:S+%u U
int countId; LP-o8c
/** Creates a new instance of CountData */ TzZq(?V
public CountBean() {} b$7 +;I;
public void setCountType(String countTypes){ IgzQr >
this.countType=countTypes; 3R/bz0 V>
} 'R)Tn!6
public void setCountId(int countIds){ KoRV%@I
this.countId=countIds; \*da6Am
} 0_/[k*Re
public String getCountType(){ y}
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return countType; l}h!B_P'
} DDZ@$L!
public int getCountId(){ 0]L"H<W
return countId; m'U0'}Ld};
} =D(j)<9$A
} m~|40)
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CountCache.java cK@wsA^4
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/* )+^+sd
* CountCache.java ~Ei<Z`3}7"
* + 3gp%`c4
* Created on 2007年1月1日, 下午5:01 TpaInXR
* CITc2v3a
* To change this template, choose Tools | Options and locate the template under <aw[ XFg
* the Source Creation and Management node. Right-click the template and choose !Cs_F&l"j
* Open. You can then make changes to the template in the Source Editor. qK+5NF|
*/ Sdo-nt
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package com.tot.count; mDWG7 Asp
import java.util.*; Wqnc{oq|$
/** x;S @bY
* S/ *E,))m
* @author gUlo]!$
*/ +|v90ed
public class CountCache { ~o(
public static LinkedList list=new LinkedList(); wkq 66?
/** Creates a new instance of CountCache */ .}t
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public CountCache() {} ks tIgcI
public static void add(CountBean cb){ ?< />Z)
if(cb!=null){ 3Vwh|1?
list.add(cb); l}
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} F
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} K9[UB
} "Q0@/bYq
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CountControl.java _t$sgz&
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/* pmM9,6P4@
* CountThread.java !1k_PY5)
* F2WKd1U
* Created on 2007年1月1日, 下午4:57 W!X@
* |4JEU3\$
* To change this template, choose Tools | Options and locate the template under 45e~6",
* the Source Creation and Management node. Right-click the template and choose sB</DS
* Open. You can then make changes to the template in the Source Editor. XSDpRo
*/ '%qr.T
%
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package com.tot.count; oRFq@g
import tot.db.DBUtils; |>Vb9:q9Po
import java.sql.*; ok[i<zl;'
/** 97]E1j]
* <} .$l
* @author "g|#B4'e
*/ NUZl`fu1Z4
public class CountControl{ 6<]lW
private static long lastExecuteTime=0;//上次更新时间 8mMQ[#0:}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 y `UaB3q
/** Creates a new instance of CountThread */ F847pyOJnf
public CountControl() {} ^#$n~]s
public synchronized void executeUpdate(){ Wri<h:1
Connection conn=null; bsX[UF
PreparedStatement ps=null; pkzaNY/q
try{
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conn = DBUtils.getConnection(); WY/}1X9.%
conn.setAutoCommit(false); $X6h|?3U,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
}pYqWTG
for(int i=0;i<CountCache.list.size();i++){ >j/w@Fj
CountBean cb=(CountBean)CountCache.list.getFirst(); uYN`:b8
CountCache.list.removeFirst(); WLT"ji0w2
ps.setInt(1, cb.getCountId()); *VcJ= b
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ps.executeUpdate();⑴ *p U x8yB
//ps.addBatch();⑵ | (93gJ
} vQCy\Gi
//int [] counts = ps.executeBatch();⑶ }j%5t ~Qa
conn.commit(); \85i+q:LuA
}catch(Exception e){ gJXaPJA{
e.printStackTrace(); }OUt sh ]y
} finally{ AKC`TA*E
try{ tA;}h7/Lc~
if(ps!=null) { 8=l%5r^cq
ps.clearParameters(); kj_c%T
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ps.close(); ,prf;|e?
ps=null; bw7@5=?;
} Ytkv!]"
}catch(SQLException e){} b;n[mk
DBUtils.closeConnection(conn); az$FnVNn=
} v+XJ*N[W
} %v|B *
public long getLast(){ vzM^$V
return lastExecuteTime; .]^?<bG
} ueudRb
public void run(){ G[=c
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long now = System.currentTimeMillis(); $i&zex{\
if ((now - lastExecuteTime) > executeSep) { uFE)17E
//System.out.print("lastExecuteTime:"+lastExecuteTime); CZ;6@{ o
//System.out.print(" now:"+now+"\n"); Y7|EIAU5Y
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); w{KavU5W
lastExecuteTime=now; Hka2
executeUpdate(); L,\Iasv
} \hXDO_U
else{ KoT\pY^7\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); g#bRT*,L
} ^W^OfY
} @dKTx#gZ
} s<Ziegmw|g
//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 +>,I1{u%&
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类写好了,下面是在JSP中如下调用。 3BI1fXT4=j
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<% R_C)
CountBean cb=new CountBean(); _f83-':W6
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^('wy};
CountCache.add(cb); %EH)&k
out.print(CountCache.list.size()+"<br>"); F5<Hm_\:
CountControl c=new CountControl(); V0@=^Bls
c.run(); LV Ge]lD
out.print(CountCache.list.size()+"<br>"); Xvu(vA
%>