我正在通過(guò)命令行讀取文件。由于該文件是從 Oracle 導(dǎo)出的 JSON，因此它具有一定的結(jié)構(gòu)。由于某種原因，此默認(rèn)結(jié)構(gòu)不是有效的 JSON。例子：// This isn't valid JSON,"items":[{"id":123,"language":"ja-JP","location":"Osaka"},{"id":33,"language":"ja-JP","location":"Tokyo"},{"id":22,"language":"ja-JP","location":"Kentok"}]}我希望它只是一個(gè)對(duì)象數(shù)組，因此具有預(yù)期的輸出：// This is valid json[{"id":123,"language":"ja-JP","location":"Osaka"},{"id":33,"language":"ja-JP","location":"Tokyo"},{"id":22,"language":"ja-JP","location":"Kentok"}]因此，我需要?jiǎng)h除第 1 行（完全）以及}文件最后一行的最后一行。該文件正在通過(guò)輸入的命令行進(jìn)行解析：file, err := ioutil.ReadFile(os.Args[1])我試圖以這種方式刪除無(wú)效的字符串/單詞，但它不會(huì)重新格式化任何內(nèi)容：// in func main()removeInvalidJSON(file, os.Args[1])// later on .. func removeInvalidJSON(file []byte, path string) { info, _ := os.Stat(path) mode := info.Mode() array := strings.Split(string(file), "\n") fmt.Println(array) //If we have the clunky items array which is invalid JSON, remove the first line if strings.Contains(array[0], "items") { fmt.Println("Removing items") array = append(array[:1], array[1+1:]...) } // Finds the last index of the array lastIndex := array[len(array)-1] // If we have the "}" in the last line, remove it as this is invalid JSON if strings.Contains(lastIndex, "}") { fmt.Println("Removing }") strings.Trim(lastIndex, "}") } // Nothing changed? fmt.Println(array) ioutil.WriteFile(path, []byte(strings.Join(array, "\n")), mode)}上面的函數(shù)確實(shí)寫入了我能看到的文件——但據(jù)我所知，它并沒(méi)有改變數(shù)組，也沒(méi)有將它寫入文件。如何有效地遠(yuǎn)程文件的第一行，以及}文件中的最后一個(gè)假花括號(hào)？我在另一個(gè)函數(shù)中解組 JSON：是否有一種方法可以使用該"encoding/json"庫(kù)更“干凈地”完成它？
1 回答
德瑪西亞99
TA貢獻(xiàn)1770條經(jīng)驗(yàn) 獲得超3個(gè)贊
此代碼存在幾個(gè)重大問(wèn)題，導(dǎo)致其行為不符合預(yù)期。我在下面的評(píng)論中注意到了這些：
func removeInvalidJSON(file []byte, path string) {
info, _ := os.Stat(path)
mode := info.Mode()
array := strings.Split(string(file), "\n")
fmt.Println(array)
//If we have the clunky items array which is invalid JSON, remove the first line
if strings.Contains(array[0], "items") {
fmt.Println("Removing items")
// If you just want to remove the first item, this should be array = array[1:].
// As written, this appends the rest of the array to the first item, i.e. nothing.
array = append(array[:1], array[1+1:]...)
}
// Finds the last ~index~ *line* of the array
lastIndex := array[len(array)-1]
// If we have the "}" in the last line, remove it as this is invalid JSON
if strings.Contains(lastIndex, "}") {
fmt.Println("Removing }")
// Strings are immutable. `strings.Trim` does nothing if you discard the return value
strings.Trim(lastIndex, "}")
// After the trim, if you want this to have any effect, you need to put it back in `array`.
}
// Nothing changed?
fmt.Println(array)
ioutil.WriteFile(path, []byte(strings.Join(array, "\n")), mode)
}
我認(rèn)為您想要的更像是：
func removeInvalidJSON(file []byte, path string) {
info, _ := os.Stat(path)
mode := info.Mode()
array := strings.Split(string(file), "\n")
fmt.Println(array)
//If we have the clunky items array which is invalid JSON, remove the first line
if strings.Contains(array[0], "items") {
fmt.Println("Removing items")
array = array[1:]
}
// Finds the last line of the array
lastLine := array[len(array)-1]
array[len(array)-1] = strings.Trim(lastLine, "}")
fmt.Println(array)
ioutil.WriteFile(path, []byte(strings.Join(array, "\n")), mode)
}
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