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To build a JAR file from a module

1. On the main menu, choose Build | Build Artifact.
2. From the drop-down list, select the desired artifact of the type JAR. The list shows all the artifacts configured for the current project. To have all the configured artifacts built, choose the Build all artifacts option.

Detail process

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基于Dropbox实现的免费私有Git版本库托管

你是否有私有Git项目需要托管却又不想把你买午饭的钱用来购买Github的付费账户？Git与Dropbox整合使用可以免费的实现这一目的，从而你的代码库可以同步到Dropbox并且在多台电脑上同步，通过这种方式你可以托管任意数量的版本库，并且是云备份哦！～。Dropbox的免费账户就有2G的空间，如果只用来托管代码是完全足够的。

下面就来一步一步的实现这个功能。

创建一个普通的本地Git版本库

创建一个git目录来存放你的版本库

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解决Excel乱码的问题

如下java代码导出的csv文件用Excel打开还是乱码， 用Sublime Text的Save with Encoding -> UTF-8 with BOM

public static void exportWithOpencsvBySql(String sql, String file) throws Exception {
        OutputStreamWriter ows = new OutputStreamWriter(new FileOutputStream(new File("/tmp/" + file)), "utf-8");
        try {
 CSVWriter writer = new CSVWriter(ows);

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Go to the starting point of the project git checkout origin master

fetch all objects git fetch origin

Make the branch from the tag git branch new_branch tag_name

Checkout the branch

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;;

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google api 翻译

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>! 基本用法

promise and deliver

(defn <!!
  "takes a val from port. Will return nil if closed. Will block
  if nothing is available."
  [port]
 (let [p (promise)

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alts! vs alt!

alts! is a function that accepts a vector of channels to take from and/or channels with values to be put on them (in the form of doubleton vectors: [c v]). The vector may be dynamically constructed; the code calling alts! may not know how many channels it'll be choosing among (and indeed that number need not be constant across invocations).

alt! is a convenience macro which basically acts as a cross between cond and alts!. Here the number of "ports" (channels or channel+value

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(def total-donations (ref 0))

(def count-donations (ref 0))

;; start 9 people collecting money

(comment
  (dotimes [_ 9]
   (doto (Thread. (fn []
                    ;; go collect $10

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;;
;; clojure.core
;; 延迟执行并缓存
;; add something
(comment
  (defmacro delay
   "Takes a body of expressions and yields a Delay object that will
   invoke the body only the first time it is forced (with force or deref/@), and
   will cache the result and return it on all subsequent force
   calls. See also - realized?"