有效地从 JSON 文件中删除无效字符？

Question

我正在通过命令行读取文件。由于该文件是从 Oracle 导出的 JSON，因此它具有一定的结构。由于某种原因，此默认结构不是有效的 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"}]}我希望它只是一个对象数组，因此具有预期的输出：// 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，我需要删除第 1 行（完全）以及}文件最后一行的最后一行。该文件正在通过输入的命令行进行解析：file, err := ioutil.ReadFile(os.Args[1])我试图以这种方式删除无效的字符串/单词，但它不会重新格式化任何内容：// 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)}上面的函数确实写入了我能看到的文件——但据我所知，它并没有改变数组，也没有将它写入文件。如何有效地远程文件的第一行，以及}文件中的最后一个假花括号？我在另一个函数中解组 JSON：是否有一种方法可以使用该"encoding/json"库更“干净地”完成它？

Answer 1

此代码存在几个重大问题，导致其行为不符合预期。我在下面的评论中注意到了这些：

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)

}

我认为您想要的更像是：

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)

}