Chen-tao

原帖地址: http://topic.csdn.net/u/20110113/19/b0d5d506-4307-428b-a61d-7974aa66a2da.html

首先要说明的是：这里介绍的方法都是大部分是本人“悟”出来的，所以网上难有流传！
好方法不能自己私藏，否则就白忙乎这几天了，分享给有需要的朋友们。如果有转载，敬请注明来自*CSDN老邓*作品。
呵呵，给自己打广告，实在是无耻之极，权当无聊之时打字之用。
欢迎流传，为最优秀的分布式版本管理系统Git做宣传！！

步骤：
1. 下载：http://loaden.googlecode.com/files/gitconfig.7z
2. 解压到：<MsysGit安装目录>/cmd/，例如：D:\Program Files\Git\cmd

Chen-tao

	public String getIpAddr(HttpServletRequest request) {
		String ip = request.getHeader("x-forwarded-for"); 
		AddrLog.debug("x-forwarded-for clientIP:"+ip);
		AddrLog.debug("remoteAddr:"+request.getRemoteAddr());
		
		if(ip !=null && !ip.equals("") && ip.length() > 0){
            //获取第一个ip
			String[] ipList = ip.split(" ");
			if(ipList.length > 0){
				ip = ipList[0];

Chen-tao

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

Chen-tao

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

Chen-tao

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia — volume /Volumes/Untitled — applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app — nointeraction

Chen-tao

git init                                                  # 初始化本地git仓库（创建新仓库）
git config --global user.name "xxx"                       # 配置用户名
git config --global user.email "xxx@xxx.com"              # 配置邮件
git config --global color.ui true                         # git status等命令自动着色
git config --global color.status auto
git config --global color.diff auto
git config --global color.branch auto
git config --global color.interactive auto
git config --global --unset http.proxy                    # remove  proxy configuration on git
git clone git+ssh://git@192.168.53.168/VT.git             # clone远程仓库

Chen-tao

 // 根据Unicode编码完美的判断中文汉字和符号
    private static boolean isChinese(char c) {
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION

Chen-tao

//https://leetcode.com/problems/sqrtx/
public int mySqrt(int x) {
    	if (x == 0) return 0;
        double last = 0;
        double res = 1;
        while (res != last)
        {
            last = res;
            res = (res + x / res) / 2;
        }

Chen-tao

//https://leetcode.com/problems/sqrtx/
public int mySqrt(int y) {
        //return (int)Math.sqrt(x);
        long L = 0, R = (long)y + 1;//[0,y)
        long ans = 0;
        while(L < R){
            long mid = (L + R) / 2;// guess mid
            if(guess(mid, y)){
                ans = mid;
                L = mid + 1;

Chen-tao

public int mySqrt(int x) {
    	long left = 0, right = x/2 +1;
    	long ans = 0;
    	while(left <= right){
    	    long mid = (left + right) / 2;
    	    if(mid * mid <= x){
    	        ans = mid;
    	        left = mid + 1;
    	    } else {
    	        right = mid - 1;