weixin_38046780的博客

原创 java 带下划线字符 转换为驼峰

/*** _ ASCII =95* 小写 转大写 - 30* 处理特殊格式的value* a - z* 97 -122*/public String cvtUnderLineToUpper(String str) {byte[] strB = str.getBytes();byte[] buffer = new byte[strB.length];boolean upCat = false;int i = 0;for (byte b : strB) {if (95 == b) {

原创 TCP 视频课笔记

原创 面试前刷题链接

https://www.jianshu.com/p/ce1fb8497883java.util.concurrent、java.util.concurrent.atomicjava.util.concurrent.lockLockSupporthttps://baijiahao.baidu.com/s?id=1666548481761194849&wfr=spider&for=pcAtomicBooleanhttps://baijiahao.baidu.com/s

原创 JVM - 马老师听课笔记

十种垃圾回收器最早的组合 serial + serial old1. seriala stop-the-world , copying collector which use a single gc年轻代单线程串行回收2. ps 年轻代并行回收3. parNew多线程+ CMS年轻代4. serial old5. parallel old6. CMS并发垃圾回收 和应用程序老年代7. G1...

原创 面试准备

https://www.cnblogs.com/shiyh/p/12868453.htmlhttps://www.jianshu.com/p/d5acdb7aed14https://www.douban.com/note/668286406/https://zhuanlan.zhihu.com/p/66160652https://zhuanlan.zhihu.com/p/66160652https://blog.csdn.net/dd864140130/a...

原创 视频课

Jvm 视频课https://www.bilibili.com/video/BV16A411v737/

原创 Google Guava Cache

<dependency> <groupId>com.google.guice</groupId> <artifactId>com.springsource.com.google.inject</artifactId> <version>2.0.0alipay</version></...

原创 JAVA Map 初始化

publicclassDemo{privatestaticfinalMap<String,String>myMap; static { myMap=newHashMap<String,String>(); myMap.put("a","b");myMap.p...

原创 学习链接

mysql创建用户并授权https://www.cnblogs.com/sos-blue/p/6852945.htmlgrant all privileges on *.* to 'root'@'%' identified by 'shiyeV587' with grant option;OceanBase小程序接入https://docs.alipay.com/mi...

原创 toString(Reader input)

public static String toString(Reader input) throws IOException { StringWriter sw = new StringWriter(); char arr[] =new char[1024 * 4]; int n=0; while (-1!=(n=input.read(arr))){ ...

转载 ngnix

https://www.cnblogs.com/codingcloud/p/5095066.html

原创 自定义异常如何不打印异常堆栈

重写这两个方法@Overridepublic Throwable fillInStackTrace() { return this;}@Overridepublic String toString() { return MessageFormat.format("{0}[{1}]",this.retCd,this.msgDes);}

原创 Illegal key size

在不修改jdk策略文件的基础上，可以用反射来修改jdk的安全策略 static { //break JCE crypto policy limit try { Class<?> clazz = Class.forName("javax.crypto.JceSecurity"); Field nameF...

原创 java web 启动后任务管理器有两个java.exe

这主要是由于java安装时自动把java.exe,javaw.exe,javaws.exe拷贝到了系统盘，开机后自动启动。删除即可