最近写了一个chrome的websocket extension, server端用的是Java的Netty框架, 后来发现golang 实现websocket 非常简单，高效， 下面是例子， 简单实现了用户登录，广播，相当于聊天室！ package main import ( "code.google.com/p/go.net/websocket" "html/template" "log" "net/http" "os" "strings" "time" ) const ( listenAddr = "localhost:9527" // server address ) var ( pwd, _ = os.Getwd() RootTemp = template.Must(templat...阅读全文
使用案例代码： package main import ( "bytes" "fmt" "log" "os/exec" ) func main() { cmd := exec.Command("php", "D:/baiduyun/command/application/cli", "read") var out bytes.Buffer cmd.Stdout = &out err := cmd.Start() if err != nil { log.Fatal(err) } log.Printf("Waiting for command to finish...") fmt.Println(cmd.Args) err = cmd.Wait() if err != nil { log.Pri...阅读全文
go语言中提供了MD5、SHA-1等几种哈希函数，下面这个例子是使用MD5和SHA-1值来对内容加密： package main import ( "crypto/md5" "crypto/sha1" "fmt" ) func main() { TestString := "Hi, pandaman!" Md5Inst := md5.New() Md5Inst.Write([]byte(TestString)) Result := Md5Inst.Sum([]byte("")) fmt.Printf("%x\n\n", Result) Sha1Inst := sha1.New() Sha1Inst.Write([]byte(TestString)) Result = Sha1Inst.Sum...阅读全文
哪位大牛能提供一个redigo 操作hmset 的例子，hmset 存的是结构体,弄了好几天了，官方的这个表示没有看懂 https://github.com/garyburd/redigo/issues/2...阅读全文
golang的template包很好用,做一些复杂的文本格式生成太有帮助了,生成网页也是很不错的,使用起来非常方便. package main import ( "fmt" "os" "text/template" ) type Latlng struct { Lat float32 Lng float32 } func (latlng Latlng) String() string { return fmt.Sprintf("%g/%g", latlng.Lat, latlng.Lng) } func main() { data := []template.FuncMap{} data = append(data, template.FuncMap{"name":"dotcoo1", "u...阅读全文
RT 能有文档或者例子就更好...阅读全文
写代码的时候发现需要对map[int64]int64排序，golang中sort包来解决这个问题，下面是从网上找的2个例子，备忘下。 例子一： package main import ( "fmt" "sort" ) func main() { m := map[string]string{"b": "15", "z": "123123", "x": "sdf", "a": "12"} mk := make([]string, len(m)) i := 0 for k, _ := range m { mk[i] = k i++ } sort.SortStrings(mk) fmt.Println(mk) } 例子二： // A data structure to hold a key/val...阅读全文
Unity部分： 新建个脚本，挂在随便一个object下面。代码如下： using UnityEngine; using System.Collections; using System.Text; public class TestScript : MonoBehaviour { public string url = "http://127.0.0.1:8000/test"; public string test_string; // Use this for initialization IEnumerator Start () { WWW www = new WWW (url); yield return www; print (www.bytes); test_string = S...阅读全文
package main import ( "fmt" "log" "net/http" "strings" ) func sayhelloName(w http.ResponseWriter, r *http.Request) { r.ParseForm() fmt.Println(r.Form) fmt.Println("path", r.URL.Path) fmt.Println("scheme", r.URL.Scheme) fmt.Println(r.Form["url_long"]) for k, v := range r.Form { fmt.Println("key:", k) fmt.Println("val:", strings.Join(v, "")) } fmt.Fp...阅读全文
package main import ( "fmt" ) type TestStruct struct { aa string name string } type Object interface{} func main() { array := []Object{} a := TestStruct{} a.aa = "aaaa" a.name = "name" array = append(array, 1) array = append(array, a) for index, value := range array { fmt.Printf("arr[%d]=%d \n", index, value) } ...阅读全文
有什么大神给个例子教我一下如何使用GDB 调试go 程...阅读全文
Hi, Can you help to figure out what's wrong with the following TLS test code? It's just a echo server, the expected result is to get echo string from server, but client always gets nothing. client.go: =============================================================== package main import ( "fmt" ; "crypto/tls"; "os" ) func main() { conn , err := tls.Di...阅读全文
liteIde建立sample工程，目录自定 我这边工程叫myTest，目录结构如下 ├── doc.go ├── main.go └── mm ├── a.go └── b.go main.go package main import ( "./mm" ) func main() { mm.Mm() } a.go package mm import ( "fmt" ) func Mm() { zz() fmt.Println("mmmmmmmmmmm") } b.go package mm import ( "fmt" ) func zz() { fmt.Println("zzzzzzzzzzz") ...阅读全文
分享地址为 https://github.com/jemygraw/TechDoc 欢迎大家审阅。如有错误，请指出。 下周将更新到App，Go轻松学里面去。 :) Lovely present by @jemygra...阅读全文
使用golang的基本log包能够满足日志的问题，特地做了一个例子如下，但感觉还是不太好，如日志文件的大小的控制等。先这样用着吧package mainimport ( "log" "os")func main(){ fileName:= "log_debug.log" //logFile,err := os.Create(fileName) logFile,err := os.OpenFile(fileName,os.O_RDWR|os.O_CREATE|os.O_APPEND,0644) defer logFile.Close() if err != nil { log.Fatalln("open file error!") } debugLog := log.New(logFile,"...阅读全文
今天项目中要将map存入cookie，于是大象哥研究了下json和base64，写了个小例子 一、将map存入cookie //要存入cookie的map your := map[string]string{} your["isuser"] = isuser your["username"] = username your["password"] = d.Strtomd5(password) //将map转成json 转换后的是[]byte，需要string(your_byte)后就是json了 your_byte, _ := json.Marshal(your) //将json base64一下 b64 := base64.NewEncoding("ABCDEFGHIJKLMNOPQRST...阅读全文
```go func main() { hash := md5.New() b := []byte("test") fmt.Printf("%x\n", hash.Sum(b)) }``` 请教一下在上面的例子中hash标准库中方法Sum的功能是什么？没有看明白...阅读全文
本例子介绍下面这些函数的使用方法。 type QuerySeter interface { Filter(string, ...interface{}) QuerySeter Exclude(string, ...interface{}) QuerySeter Limit(interface{}, ...interface{}) QuerySeter OrderBy(...string) QuerySeter Count() (int64, error) Exist() bool All(interface{}, ...string) (int64, error) One(interface{}, ...string) error ... } package main import ( "f...阅读全文
[http://bpowers.github.com/weblog/2013/01/05/optimizing-real-world-go/](http://bpowers.github.com/weblog/2013/01/05/optimizing-real-world-go/) 如何优化代码 给出的例子在string和byte的转化进行处理，还有，不使用原生的bytes.SplitN 只是文中给的例子我在centos下没有跑成...阅读全文
package main import ( "fmt" "math/rand" "time" ) func main() { fmt.Println("start") chn := make(chan int, 5) rand.Seed(time.Now().UnixNano()) for i := 0; i < 5; i++ { x := rand.Intn(5) fmt.Println("i is", i, "rand is:", x) go worker(i, x, chn) } fmt.Println("end") for i := 0; i < 5; i++ { j := <-chn fmt.Println(j) } } func worker(i int, sleepInt in...阅读全文
从变量定义，到interface使用，各种语法一网打尽 谁有收藏吗， 分享一下吧，谢...阅读全文
go 依赖注入 库 利用库 github.com/facebookgo/inject 例子 package main import ( "fmt" "github.com/facebookgo/inject" ) type DBEngine struct { Name string } type UserDB struct { Db *DBEngine `inject:""` } type UserService struct { Db *UserDB `inject:""` } type App struct { Name string User *UserService `inject:""` } func (a *App) Create() string { return "creat...阅读全文
go里有sort的排序的包，可以直接使用，也可以使用func来自定义 下面给例子 //****************************************************/ //Copyright(c) 2015 Tencent, all rights reserved // File : sorting.go // Author : ningzhong.zeng // Revision : 2015-11-26 19:58:56 // Description : //****************************************************/ import ( "fmt" "sort" ) // 自定义func排序 type ByLengt...阅读全文
// Copyright 漏 2010-12 Qtrac Ltd. // // This program or package and any associated files are licensed under the // Apache License, Version 2.0 (the "License"); you may not use these files // except in compliance with the License. You can get a copy of the License // at: http://www.apache.org/licenses/LICENSE-2.0. // // Unless required by applicable...阅读全文
Interface type Shaper interface { Area() float32 } type Square struct { side float32 } func (sq *Square) Area() float32 { return sq.side * sq.side } func main() { sq1 := new(Square) sq1.side = 5 areaIntf := Shaper(sq1) // areaIntf := sq1 fmt.Printf(“%f\n”, areaIntf.Area()) } r := Rectangle{5, 3} q := &square{5} shapes := []Shaper{r, q} for n, _ := ...阅读全文
package main import( "fmt" ) func main(){ var yk = make(map[string][]string) yk["one"] = []string{"a123", "a456", "a789"} fmt.Println("yk[one] len = ", len(yk["one"])) i := len(yk["one"]) for j:=0; j
简单例子 cGo.go package main //#include
原题如下： write const declarations for KB,MB,up through YB as compactly as you can. 这里的k,m等都是10的次方，比如KB是1000，不是1024 书上有例子是1024的
const(
_=1<<(10*iota)
KiB//1024
MiB//1048576
...
)//太多了就不打了
例子1 package main import ( "fmt" ) func main() { f := closer(10) //fmt.Println(f(1)) //fmt.Println(f(2)) f(1) f(2) } func closer(x int) func(int) int { fmt.Printf("%p\n", &x) return func(y int) int { fmt.Printf("%p\n", &x) return x + y } } 打印结果是： 0x118400e8 0x118400e8 0x118400e8 例子2 package main import ( "fmt" ) func main() { for i := 0; i < 3; i++ ...阅读全文
出自 kubernetes/staging/src/k8s.io/client-go/util/workqueue/parallelizer.gotype DoWorkPieceFunc func(piece int)// Parallelize is a very simple framework that allow for parallelizing// N independent pieces of work.func Parallelize(workers, pieces int, doWorkPiece DoWorkPieceFunc) { toProcess := make(chan int, pieces) for i := 0; i < pieces; i++ { toPr...阅读全文
``` import "fmt" func main() { intSlice := []int{1, 2, 3, 4} for index, value := range intSlice { fmt.Println(index, value) // 情况1 //if value == 2 { // intSlice = append(intSlice[:index], intSlice[index+1:]...) //} // 情况2 //intSlice = []int{} } } ``` 这个例子很有趣，我没分析出原因...阅读全文
具体看下面2个例子: 无 buffer 的: http://play.golang.org/p/RwPbCcueWh func main() { ch := make(chan bool) go func() { println("fuck buffer channel") <-ch }() ch <- true } 有buffer的: http://play.golang.org/p/YV9H6WPYuJ func main() { ch := make(chan bool, 1) go func() { println("fuck buffer channel") <-ch }() ch <- true } 第二个程序(有buffer的chan)无法保证收/发同步, 导致main退出时 ...阅读全文
import ( "bytes" "encoding/binary" "encoding/gob" "fmt" ) func str_to_byte(src string) []byte { //strSlice := []string{src} buffer := &bytes.Buffer{} gob.NewEncoder(buffer).Encode(src) return buffer.Bytes() } func uint64_to_byte(src uint64) []byte { buf := make([]byte, 8) binary.BigEndian.PutUint64(buf, src) return buf } func main() { var u uint64 ...阅读全文
Buffered Channels package main import "fmt" func main() { ch := make(chan int, 2) ch <- 1 ch <- 2 fmt.Println(<-ch) fmt.Println(<-ch) } 如果操作一个空的channel会怎么样呢？ package main import "fmt" func main() { ch := make(chan int, 2) ch <- 1 ch <- 2 fmt.Println(<-ch) fmt.Println(<-ch) v, ok := <-ch fmt.Println(v,ok) } 12fatal error: all goroutines are asleep -...阅读全文
【https://golang.org/ref/spec#Types 】--->这是关于type的描述。里面有两句： Types may be named or unnamed. Named types are specified by a (possibly qualified) type name; unnamed types are specified using a type literal, which composes a new type from existing types. 有点不大理解，因为下面没有举出例子。所以还是不懂什么叫named type，什么叫unnamed type。 本来想跳过，以后再慢慢接触，可是另一个地方又出现这个named和 unnamed...阅读全文
package main import ( "github.com/dynport/gossh" "log" ) func MakeLogger(prefix string) gossh.Writer { return func(args ...interface{}) { log.Println((append([]interface{}{prefix}, args...))...) } } func main() { client := gossh.New("192.168.1.106", "mmc") client.SetPassword("123456") client.DebugWriter = MakeLogger("DEBUG") client.InfoWriter = Mak...阅读全文
import ( "bytes" "encoding/binary" "encoding/gob" "fmt" ) func str_to_byte(src string) []byte { //strSlice := []string{src} buffer := &bytes.Buffer{} gob.NewEncoder(buffer).Encode(src) return buffer.Bytes() } func uint64_to_byte(src uint64) []byte { buf := make([]byte, 8) binary.BigEndian.PutUint64(buf, src) return buf } func main() { var u uint64 ...阅读全文
package main import ( "fmt" "os" "strings" ) func main() { err := os.Setenv("XIAO", "xiaochuan") //临时设置 系统环境变量 if err != nil { fmt.Println(err.Error()) } fmt.Println(os.Getenv("XIAO")) //获取环境变量 fmt.Println(os.Getenv("GOPATH")) for _, v := range os.Environ() { //获取全部系统环境变量 获取的是 key=val 的[]string str := strings.Split(v, "=") fmt.Printf("key=%s,val=%s...阅读全文
写一个简单的key-value数据库，实现下面几个接口。 db:new() => Db. db:destroy(Db) => ok. db:write(Key, Element, Db) => NewDb. db:delete(Key, Db) => NewDb. db:read(Key, Db) =>{ok, Element} | {error, instance}. db:match(Element, Db) => [Key1, ..., KeyN]. 例子: 1> c(db). {ok,db} 2> Db = db:new(). [] 3> Db1 = db:write(111,222, Db). [{111,222}] 4> Db2 = db:write(333, 444, Db1)...阅读全文
Go has various value types including strings, integers, floats, booleans, etc. Here are a few basic examples. Strings, which can be added together with + Integers and floats. Booleans, with boolean operators as you’d expect. package main import "fmt" func main() { fmt.Println("go" + "lang") fmt.Println("1+1 =", 1+1) fmt.Println("7.0/3.0 =", 7.0/3.0...阅读全文
顺便写Go 在决定怎么debug的时候遇到了这种问题 有大佬能举个实际的例子 帮我理解一下吗...阅读全文
以int 为例子. 适合int系列, float double . 不适用于字符串. ``` package main //#include
Go 的接口（interface）和 Rust 的特征（Trait）是经常被放在一起做比较的概念。咱可以用它们来实现计算不同几何形状的面积和周长的功能。 Go type geometry interface { area() float64 perim() float64 } type rect struct { width, height float64 } type circle struct { radius float64 } func (r rect) area() float64 { return r.width * r.height } func (r rect) perim() float64 { return 2*r.width + 2*r.height } func (c...阅读全文
关于这一部分，仅给出一个MD5的例子和一个SHA1的例子，分别对应： - Windows平台下面的MD5算法 - 计算SHA1 代码： package main import ( "fmt" "crypto/md5" "crypto/sha1" ) func printBytes(x []byte) { for _, b := range x { fmt.Printf("%02x ", b) } fmt.Println() } /* C:\Go\bin\go.exe run D:\examples\helloworld.go 6c d3 55 6d eb 0d a5 4b ca 06 0b 4c 39 47 98 39 aa f4 c6 1d dc c5 e8 a2 da be de 0f ...阅读全文
关于这一部分，仅给出一个MD5的例子和一个SHA1的例子，分别对应： - Windows平台下面的MD5算法 - 计算SHA1 代码： package main import ( "fmt" "crypto/md5" "crypto/sha1" ) func printBytes(x []byte) { for _, b := range x { fmt.Printf("%02x ", b) } fmt.Println() } /* C:\Go\bin\go.exe run D:\examples\helloworld.go 6c d3 55 6d eb 0d a5 4b ca 06 0b 4c 39 47 98 39 aa f4 c6 1d dc c5 e8 a2 da be de 0f ...阅读全文
以下是一个特殊的例子： package main import "fmt" type wenbin struct { name string number int } type wenbinstruct struct { *wenbin } func(wb *wenbin) testFunc(){ fmt.Println("wenbintestjklsd") } func main(){ fmt.Println("wenbin") wenbinptr := &wenbin{name:"wenbin",number:100} wenbintest := wenbinstruct{wenbinptr} fmt.Println(wenbintest.name) fmt.Println(wenbin...阅读全文
在开发中，我们经常会遇到一个nil值不等于nil，先看一下下面这个例子 type itest struct { a string } func printA() *itest{ return nil } func main() { var i interface{} = printA() fmt.Printf("i is nil %v, i = %v", i == nil, i) } 最后输出结果是 i is nil false, i =
