go 语言学习笔记（一）

本次学习目的：

1、readfile.go  

 1 package main
 2 
 3 import (
 4     "bufio"
 5     "fmt"
 6     "io"
 7     "os"
 8 )
 9 
10 func ReadFile(filepath string) []string {
11     fi, err := os.Open(filepath)
12     if err != nil {
13         fmt.Printf("Read file error\n")
14     }
15     defer fi.Close()
16 
17     br := bufio.NewReader(fi)
18     var lineList []string
19     for {
20         line, _, err := br.ReadLine()
21         if err == io.EOF {
22             break
23         }
24         if err != nil {
25             fmt.Println("Error!")
26         }
27         lineList = append(lineList, string(line))
28     }
29     return lineList
30 }

2、main.go 的实现

1.  1 package main
    2 
    3 import (
    4     "fmt"
    5     "io"
    6     "net/http"
    7     "os"
    8     "path/filepath"
    9     "strings"
   10     "time"
   11 )
   12 
   13 var (
   14     url      = "http://132.121.08.123:8008/REST/docServiceV2?timestamp=1450063392000&organId=2222&busiType=1&appId=crmlog&staffNo=GZTEST200&filename=JBRZP/20180927/76920180927173700060_713991642.jpg&method=get&password=crmlog1452&latnId=769&signature=731ccc37de5e48dc69bb9ba34b9f3188&version=001"
   15     filename = "JBRZP/20180927/76920180927173700060_713991642.jpg"
   16     str      = "latnId=769"
   17 )
   18 
   19 func checkErr(err error) {
   20     if err != nil {
   21         panic(err)
   22     }
   23 }
   24 
   25 func CreateDateDir(Path string) string {
   26     foldname := time.Now().Format("20190314")
   27     foldpath := filepath.Join(Path, foldname)
   28     if _, err := os.Stat(foldpath); os.IsNotExist(err) {
   29         os.Mkdir(foldpath, 0777)
   30         os.Chmod(foldpath, 0777)
   31     }
   32     return foldpath
   33 }
   34 
   35 func downLoad(buf []string, new_url string, filename string, fold string) {
   36     var (
   37         i                     int
   38         image_url, image_path string
   39         list                  []string
   40     )
   41     for i = 0; i < len(buf); i++ {
   42         list = strings.Split(buf[i], "/")
   43         image_url = strings.Replace(new_url, filename, buf[i], -1)
   44         res, err := http.Get(image_url)
   45         image_path = filepath.Join(fold, list[len(list)-1])
   46         f, err := os.Create(image_path)
   47         checkErr(err)
   48         io.Copy(f, res.Body)
   49     }
   50 }
   51 
   52 func main() {
   53     var (
   54         new_url, latnID, newpath string
   55     )
   56     fmt.Println("请输入区号(如广州：200): ")
   57     fmt.Scanln(&latnID)
   58     latnID = "latnID=" + latnID
   59     path, err := os.Getwd()
   60     checkErr(err)
   61     newpath = CreateDateDir(path)
   62     data_path := path + "\\data.txt"
   63     buf := ReadFile(data_path)
   64     new_url = strings.Replace(url, str, latnID, -1)
   65     downLoad(buf, new_url, filename, newpath)
   66     fmt.Println("GetImage Success!")
   67 }学习参考建议