go 语言学习笔记（一）

本次学习目的：熟悉了解 go 语言特点，实现基本功能。

1、readfile.go

 package main

 import (
     "bufio"
     "fmt"
     "io"
     "os"
 )

 func ReadFile(filepath string) []string {
     fi, err := os.Open(filepath)
     if err != nil {
         fmt.Printf("Read file error\n")
     }
     defer fi.Close()

     br := bufio.NewReader(fi)
     var lineList []string
     for {
         line, _, err := br.ReadLine()
         if err == io.EOF {
             break
         }
         if err != nil {
             fmt.Println("Error!")
         }
         lineList = append(lineList, string(line))
     }
     return lineList
 }

2、main.go 的实现

 package main

 import (
     "fmt"
     "io"
     "net/http"
     "os"
     "path/filepath"
     "strings"
     "time"
 )

 var (
     url      = "http://132.121.00.111:8008/REST/docServiceV2?timestamp=14500903392000&organId=2222&busiType=1&appId=crmlog&staffNo=GZTEST200&filename=JBRZP/20180927/76920180927173700060_713991642.jpg&method=get&password=crmlog1452&latnId=769&signature=731ccc37de5e48dc69bb9ba34b9f3188&version=001"
     filename = "JBRZP/20180927/76920180927173700060_713991642.jpg"
     str      = "latnId=769"
 )

 func checkErr(err error) {
     if err != nil {
         panic(err)
     }
 }

 func CreateDateDir(Path string) string {
     foldname := time.Now().Format("")
     foldpath := filepath.Join(Path, foldname)
     if _, err := os.Stat(foldpath); os.IsNotExist(err) {
         os.Mkdir(foldpath, 0777)
         os.Chmod(foldpath, 0777)
     }
     return foldpath
 }

 func downLoad(buf []string, new_url string, filename string, fold string) {
     var (
         i                     int
         image_url, image_path string
         list                  []string
     )
     for i = 0; i < len(buf); i++ {
         list = strings.Split(buf[i], "/")
         image_url = strings.Replace(new_url, filename, buf[i], -1)
         res, err := http.Get(image_url)
         image_path = filepath.Join(fold, list[len(list)-1])
         f, err := os.Create(image_path)
         checkErr(err)
         io.Copy(f, res.Body)
     }
 }

 func main() {
     var (
         new_url, latnID, newpath string
     )
     fmt.Println("请输入区号(如广州：200): ")
     fmt.Scanln(&latnID)
     latnID = "latnID=" + latnID
     path, err := os.Getwd()
     checkErr(err)
     newpath = CreateDateDir(path)
     data_path := path + "\\data.txt"
     buf := ReadFile(data_path)
     new_url = strings.Replace(url, str, latnID, -1)
     downLoad(buf, new_url, filename, newpath)
     fmt.Println("GetImage Success!")
 }

学习参考：

1、 go 语言学习手册 ： https://cloud.tencent.com/developer/doc/1101

2、 go 语言开发 IDE 推荐：LiteIDE

3、 go 开发环境配置参考：https://blog.csdn.net/meiwei_1/article/details/79193853