Three methods of traversing directories in Go language

1. Write it in front

We use the command linetree /?andtree /FCheck the tree directory as follows:

D:\Go_WorkSpace\p3-traversal>tree /?
Graphically displays the folder structure of the drive or path.

TREE [drive:][path] [/F] [/A]

/F Displays the name of the file in each folder.
/A Use ASCII characters instead of extended characters.

D:\Go_WorkSpace\p3-traversal>tree /F
Folder PATH List
Volume serial number is 277B-1704
D:.
│  
│  main_filepath_glob.go
│  main_filepath_walk.go
│  main_ioutil_ReadDir.go
│
└─Family Directory
    │  
    │
└─Subdirectory
        │  
        │  
        │  
        │
└─Sun Directory
               
               

2. Use

• This method reads the contents of the directory and returns the contents of each file or directory in the directoryObject slice;
• Can be usedforLoop through the slice and print out the name of each file or directory;

Examples are as follows:

package main

import (
    "fmt"
    "io/ioutil"
    "log"
)

func main() {
    files, err := (".")
    if err != nil {
        (err)
    }
    for _, file := range files {
        (())
    }
}

Results output:

D:\Go_WorkSpace\p3-traversal>go run main_ioutil_ReadDir.go

main_filepath_glob.go
main_filepath_walk.go
main_ioutil_ReadDir.go
Parent directory

Analysis instructions:

1. Only print the current directory, not the descendants directory;
2. Will not print out.and..etc. Special directories;

III. Use

• This method traverses the file tree in the root of the specified directory (a file tree) and call the function for each file or directory encountered;
• Anonymous functions can be used (an anonymous function) Print out the name of each file or directory
  Examples are as follows:

package main

import (
    "fmt"
    "os"
    "path/filepath"
)

func main() {
    err := (".", func(path string, info , err error) error {
        (path)
        return nil
    })
    if err != nil {
        (err)
    }
}

Results output:

D:\Go_WorkSpace\p3-traversal>go run main_filepath_walk.go
.

main_filepath_glob.go
main_filepath_walk.go
main_ioutil_ReadDir.go
Parent directory
Parent directory\
Parent directory\Subdirectory
Parent directory\Subdirectory\
Parent directory\Subdirectory\
Parent directory\Subdirectory\
Parent directory\Subdirectory\Summary directory
Parent directory\Subdirectory\Summary directory\Summary directory\
Parent directory\Subdirectory\Summary directory\Summary directory\

Analysis instructions:

1. Print the current directory, including the descendants directory;
2. Include.Special directories such as traversal need to be excluded;

4. Use

• This method returns a list of file names that match the specified pattern;
• Wildcard characters can be used (*) to match all files in the current directory

Examples are as follows:

package main

import (
    "fmt"
    "log"
    "os"
    "path/filepath"
)

func main() {
    pwd, _ := ()
    filePaths, err := ((pwd, "*"))
    if err != nil {
        (err)
    }
    for _, filePath := range filePaths {
        (filePath)
    }
}

Results output:

D:\Go_WorkSpace\p3-traversal>go run main_filepath_glob.go
D:\Go_WorkSpace\p3-traversal\
D:\Go_WorkSpace\p3-traversal\main_filepath_glob.go
D:\Go_WorkSpace\p3-traversal\main_filepath_walk.go
D:\Go_WorkSpace\p3-traversal\main_ioutil_ReadDir.go
D:\Go_WorkSpace\p3-traversal\parent directory

Analysis instructions:

1. Only print the current directory, not the descendants directory;
2. Will not print out.and..etc. Special directories;
3. The return isAbsolute path；

Summarize

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