<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[jiangchengzi_的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/jiangchengzi_</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; jiangchengzi_]]></copyright><item><title><![CDATA[将HTTPS证书导入jre security证书库下]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/81006628</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/81006628</guid><author>jiangchengzi_</author><pubDate>Wed, 11 Jul 2018 20:45:27 +0800</pubDate><description><![CDATA[将证书导入证书库以后，HttpClient可以直接https接口：

sudo keytool -import -alias myfile.cer -keystore &quot;/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/security/cacerts&quot; -file myfile.cer -trustc...]]></description><category></category></item><item><title><![CDATA[MD5加密后转String 问题]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/80481097</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/80481097</guid><author>jiangchengzi_</author><pubDate>Mon, 28 May 2018 13:35:09 +0800</pubDate><description><![CDATA[项目中遇到一个问题，需要使用MD5加密后将字符串上传，尝试了几次发现总是返回签名错误。网上查了很久以后发现 
MD5加密后的byte[]数组不能直接toString() 
需要将byte[]每一位都转成16进制输出，代码如下



    private static String byteToString(String bs) {
        StringBuilder stringBuil...]]></description><category></category></item><item><title><![CDATA[Joiner使用Demo]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/80345044</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/80345044</guid><author>jiangchengzi_</author><pubDate>Thu, 17 May 2018 00:28:51 +0800</pubDate><description><![CDATA[工具类Joiner的用法

Joiner是Guava库下一个工具之一，提供了各种方法来处理字符串加入操作，对象等。 
其主要的的用法有三种：


Joiner.on(“字符串连接符”);
withKeyValueSeparator方法返回一个MapJoiner对象
appendTo方法




import org.junit.Test;
import java.util.HashMap;
imp...]]></description><category></category></item><item><title><![CDATA[线程死锁，使用Future捕获死锁超时]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78890820</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78890820</guid><author>jiangchengzi_</author><pubDate>Mon, 25 Dec 2017 11:28:36 +0800</pubDate><description><![CDATA[经典的死锁例子，在以后的编程中可以将不确定是否死锁的程序加上超时判断。import java.util.concurrent.*;public class DeadLock implements Runnable {
    public int flag = 1;
    //静态对象是类的所有对象共享的    
    private static Object o1 = new Object(]]></description><category></category></item><item><title><![CDATA[SGA_MAX_SIZE  cannot be set to more than MEMORY_TARGET]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78498674</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78498674</guid><author>jiangchengzi_</author><pubDate>Fri, 10 Nov 2017 13:05:25 +0800</pubDate><description><![CDATA[报错：SQL> startup
ORA-00844: Parameter not taking MEMORY_TARGET into account
ORA-00851: SGA_MAX_SIZE * cannot be set to more than MEMORY_TARGET *.原因： 
为了解决内存报错，使用了错误的方法，sga_max_size设置过大。alter system set]]></description><category></category></item><item><title><![CDATA[在尝试分配 *字节 (kxs-heap-c,kghsstk) 时进程内存不足]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78498585</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78498585</guid><author>jiangchengzi_</author><pubDate>Fri, 10 Nov 2017 12:45:01 +0800</pubDate><description><![CDATA[环境：Oracle11g，CentOS7.4 
问题：ORA-04030: 在尝试分配 2024 字节 (kxs-heap-c,kghsstk) 时进程内存不足先说解决办法吧： 
alter system set optimizer_features_enable=’9.2.0’ scope=both sid=’*’; 转自：http://blog.youkuaiyun.com/zhanghc_kedamaom]]></description><category></category></item><item><title><![CDATA[U盘容量从16G变成8M解决办法]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78397303</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/78397303</guid><author>jiangchengzi_</author><pubDate>Mon, 30 Oct 2017 21:02:02 +0800</pubDate><description><![CDATA[今天在使用UltraISO制作启动盘之后，我对优盘进行了格式化随后我惊奇的发现U盘从16G容量变成了8M。 
     之后我上网百度了很久，都在推荐使用量产工具，然后我尝试了两个多小时都没有成功，可能是因为没有找到合适型号的量产工具。 
折腾了很久我终于解决了，其实很简单，一定要mark下。 
一、
  计算机 -管理 -磁盘管理 
  查看你的U盘是不是有一部分没有分区。 
  
看看这个部位是]]></description><category></category></item><item><title><![CDATA[python实现最简单斐波那契数列]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/77962912</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/77962912</guid><author>jiangchengzi_</author><pubDate>Wed, 13 Sep 2017 10:37:45 +0800</pubDate><description><![CDATA[python实现最简单斐波那契数列著名的斐波拉契数列（Fibonacci），除第一个和第二个数外，任意一个数都可由前两个数相加得到：1, 1, 2, 3, 5, 8, 13, 21, 34, …def fib(max):
    n,a,b = 0,0,1
    while n < max:
        print(b)
        a,b=b,a+b
        n=n+1]]></description><category></category></item><item><title><![CDATA[java 实现最简单的斐波那契数列]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/77001555</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/77001555</guid><author>jiangchengzi_</author><pubDate>Wed, 09 Aug 2017 16:41:00 +0800</pubDate><description><![CDATA[java 实现最简单的斐波那契数列



使用递归实现



public int fibonacci(int n) {
        // write your code here
        int a=0;
        int b=1;
        if(n == 1) return a;
        if(n == 2) return b;
        return ...]]></description><category></category></item><item><title><![CDATA[第一篇博客]]></title><link>https://blog.youkuaiyun.com/jiangchengzi_/article/details/56352054</link><guid>https://blog.youkuaiyun.com/jiangchengzi_/article/details/56352054</guid><author>jiangchengzi_</author><pubDate>Wed, 22 Feb 2017 00:00:08 +0800</pubDate><description><![CDATA[我的第一篇博客，仅以此开始我自己的技术博客之路。
这是一次很开心的学习过程，作为公司的新人，数据库（oracle）的初学者。
前几天尹工突然想知道数据库中“张三”这个客户名旗下有多少个账号，就此我们用count计算：
select count(*) from t_table where CSTM_NAME='张三';
即可得出张三旗下有多少子账号。
之后对代码进行了优化，使得阅读性更高：]]></description><category></category></item></channel></rss>