<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[程序员的专栏]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/ZWLJavaWeb</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; ZWLJavaWeb]]></copyright><item><title><![CDATA[Hadoop集群搭建]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/84061449</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/84061449</guid><author>ZWLJavaWeb</author><pubDate>Wed, 14 Nov 2018 09:56:59 +0800</pubDate><description><![CDATA[一、环境准备以及基础配置
1、准备环境，centos7虚拟机三台，192.168.2.150，151、152
2、创建hadoop用户
useradd -d /home/hadoop -m hadoop

3、修改hadoop密码
passwd hadoop

4、修改主机名(分别修改三台机器的主机名为master、slave1、slave2)
hostnamectl set-hostname m...]]></description><category></category></item><item><title><![CDATA[Python3.7 安装 scikit-learn]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/82289426</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/82289426</guid><author>ZWLJavaWeb</author><pubDate>Sat, 01 Sep 2018 18:55:28 +0800</pubDate><description><![CDATA[pip3 install cython


安装sklearn：

pip3 install git+https://github.com/scikit-learn/scikit-learn


安装出现以下问题

    copying sklearn\tests\test_kernel_ridge.py -&amp;amp;amp;gt; build\lib.win-amd64-3.7\sklearn\tests
 ...]]></description><category></category></item><item><title><![CDATA[SpringBoot整合velocity]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/60752379</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/60752379</guid><author>ZWLJavaWeb</author><pubDate>Tue, 07 Mar 2017 10:06:43 +0800</pubDate><description><![CDATA[SpringBoot整合velocity]]></description><category></category></item><item><title><![CDATA[springBoot整合webSocket]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/60126258</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/60126258</guid><author>ZWLJavaWeb</author><pubDate>Fri, 03 Mar 2017 09:42:00 +0800</pubDate><description><![CDATA[1、使用注解@ServerEndpoint注解webSocket
@ServerEndpoint("/logWebSocket")
public class LogWebSocketHandle {    /**
     * 新的WebSocket请求开启
     */
    @OnOpen
    public void onOpen(Session session) {
    }]]></description><category></category></item><item><title><![CDATA[挑出字符串中的数组、字母、空格个数]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047604</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047604</guid><author>ZWLJavaWeb</author><pubDate>Mon, 13 Feb 2017 13:34:32 +0800</pubDate><description><![CDATA[挑出字符串中的数组、字母和空格的个数]]></description><category></category></item><item><title><![CDATA[交叉匹配算法]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047392</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047392</guid><author>ZWLJavaWeb</author><pubDate>Mon, 13 Feb 2017 13:12:12 +0800</pubDate><description><![CDATA[应用场景：常见分销系统，国外3M系统中，业务中包含提供帮助和得到帮助双方交易用户，提供帮助的资金要顺序匹配给得到帮助的用户，在匹配过程中会出现交易双方数据拆分情况，在此业务中如果有一方数据匹配完成，则该匹配业务结束。 
     要求： 
    1、必须进行顺序匹配 
    2、针对每一笔提供帮助，匹配的金额不能重复 
思路：针对要求2，定义一个Map对象，key为提供帮助的订单号，value为]]></description><category></category></item><item><title><![CDATA[Java实现身份证校验算法]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047332</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047332</guid><author>ZWLJavaWeb</author><pubDate>Mon, 13 Feb 2017 13:05:04 +0800</pubDate><description><![CDATA[java，]]></description><category></category></item><item><title><![CDATA[找出数组中左加和等于右加和的数字]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047191</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/55047191</guid><author>ZWLJavaWeb</author><pubDate>Mon, 13 Feb 2017 12:42:23 +0800</pubDate><description><![CDATA[找出数组中左加和等于右加和的数字]]></description><category></category></item><item><title><![CDATA[反转字符串的四种方法]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/53871905</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/53871905</guid><author>ZWLJavaWeb</author><pubDate>Sun, 25 Dec 2016 19:52:08 +0800</pubDate><description><![CDATA[1、使用StringBuffer自带的方法实现public String reverse1(String str) {    if(str == null || str.length()<=1){
        return str;
    }
    return new StringBuffer(str).reverse().toString();
}2、 适当的使用StringBuffer]]></description><category></category></item><item><title><![CDATA[优化SQL查询：如何写出高性能SQL语句]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/53871091</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/53871091</guid><author>ZWLJavaWeb</author><pubDate>Sun, 25 Dec 2016 17:54:29 +0800</pubDate><description><![CDATA[1、 首先要搞明白什么叫执行计划？执行计划是数据库根据SQL语句和相关表的统计信息作出的一个查询方案，这个方案是由查询优化器自动分析产生的，比如一条SQL语句如果用来从一个 10万条记录的表中查1条记录，那查询优化器会选择“索引查找”方式，如果该表进行了归档，当前只剩下5000条记录了，那查询优化器就会改变方案，采用 “全表扫描”方式。可见，执行计划并不是固定的，它是“个性化的”。产生一个正确的“执]]></description><category></category></item><item><title><![CDATA[SpringMvc整合ehcaech]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/52005807</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/52005807</guid><author>ZWLJavaWeb</author><pubDate>Sat, 23 Jul 2016 18:07:52 +0800</pubDate><description><![CDATA[SpringMvc整合ehcaech]]></description><category></category></item><item><title><![CDATA[ibatis基于拦截器的分页实现]]></title><link>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/52005657</link><guid>https://blog.youkuaiyun.com/ZWLJavaWeb/article/details/52005657</guid><author>ZWLJavaWeb</author><pubDate>Sat, 23 Jul 2016 17:41:42 +0800</pubDate><description><![CDATA[ibatis基于拦截器的分页实现]]></description><category></category></item></channel></rss>