学习 (2012.01)

 

 

http://www.tbdata.org/archives/206   淘宝关于hadoop的及片文章

 

 

http://www.blogjava.net/jiangshachina/archive/2010/05/02/319888.html   

 

 

http://www.blogjava.net/sandy/archive/2012/01/13/snaker.html  爬虫

 

http://www.cnblogs.com/bluesky5304/archive/2010/03/18/1689179.html   DFS 分布式文件系统

http://www.blogjava.net/killme2008/archive/2008/06/05/206043.html  HDFS 文件系统

 

 

 http://dev.mysql.com/doc/refman/5.0/en/innodb-storage-engine.html   mysql innodb 官网

http://www.hadoopor.com/   hadoop 

https://cwiki.apache.org/confluence/display/Hive/HBaseIntegration  hbase

 

http://forge.mysql.com/wiki/MySQL_Internals  mysql 

 

 

http://www.cnblogs.com/TomXu/archive/2011/12/15/2288411.html

 

2.  json 转化

str 表示标准的 json,人谈后将其转化为 JSONObject,然后转为JSONArray 

JSONObject jo = new JSONObject(str);
JSONArray asonArray = jo.getJSONArray("users");

for (int i = 0; i < asonArray.length(); i++) {
Object o = asonArray.get(i);
JSONObject jo1 = (JSONObject) o;

System.out.println(jo1.getString("id"));
}

 

 

3.  org.slf4j.Logger

import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public class Wombat {

   final static Logger logger = LoggerFactory.getLogger(Wombat.class);
   Integer t;
   Integer oldT;

   public void setTemperature(Integer temperature) {
     oldT = t;        
     t = temperature;
     logger.debug("Temperature set to {}. Old temperature was {}.", t, oldT);
     if(temperature.intValue() > 50) {
       logger.info("Temperature has risen above 50 degrees.");
     }
   }
 }

4.  java 解析 xml
Java解析XML汇总(DOM/SAX/JDOM/DOM4j/XPath)

5.

今天看到了一段判断浏览器是否IE的最酷代码,果断收下:

    if(!-[1,]) 
alert("IE");
else
alert("非IE");

 

斐波那契数列:(i最好不要超过40,要不然浏览器也可能hold不住)

function f(i){return i<3?1:f(i-1)+f(i-2);}

求n! 即,1×2×3×4×5×······×n

function n(i){return i<2?1:i*n(i-1);}

求1+2+···+n  

function p(i){return i<2?1:i+p(i-1);}
posted @ 2012-01-13 14:51  wtx  阅读(215)  评论(0编辑  收藏  举报