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，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：
半分钟更新一次计数.
count包中三个*.java文件
1.CountBean.java
package count;
public class CountBean { private String countType;
int countId;
public CountBean() { }
public void setCountType(String countTypes) { this.countType = countTypes; }
public void setCountId(int countIds) { this.countId = countIds; }
public String getCountType() { return countType; }
public int getCountId() { return countId; } }
2 CountCache.java
package count;
import java.util.*;
public class CountCache { public static LinkedList list = new LinkedList();
public CountCache() { }
public static void add(CountBean cb) { if (cb != null) { list.add(cb); } }
} 3.CountControl.java
package count;
import java.sql.*; import com.pp.db.*;
public class CountControl { private static long lastExecuteTime = 0;// 上次更新时间
private static long executeSep = 30000;// 定义更新间隔时间，单位毫秒 半分钟
public CountControl()
{
}
public synchronized void executeUpdate()
{
Connection conn = null;
PreparedStatement ps = null;
try
{
conn = new DBConnection().getConn();
conn.setAutoCommit(false);
ps = conn
.prepareStatement("update t_news set hits=hits+1 where id=?");
for (int i = 0; i < CountCache.list.size(); i++)
{
CountBean cb = (CountBean) CountCache.list.getFirst();
CountCache.list.removeFirst();
ps.setInt(1, cb.getCountId());
ps.executeUpdate();
// ps.addBatch();
}
// int[] counts = ps.executeBatch();
conn.commit();
}
catch (Exception e)
{
e.printStackTrace();
}
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