BadUncle BadUncleX

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);

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

google api 翻译

>! 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)

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

	(def total-donations (ref 0))

	(def count-donations (ref 0))

	;; start 9 people collecting money

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

	;;
	;; 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?"