StreamTokenizer - 如何将每个字符拆分为标记

Question

简而言之：如何更改 StreamTokenizer 以便它将输入文件中的每个字符拆分为标记。

例如，如果我有以下输入：

1023021023584

如何读取才能将每个单独的字符保存到数组的特定索引中？

Answer 1

你必须调用 StreamTokenizer.resetSyntax() 方法如下

public static void main(String[] args) {
    try (FileReader fileReader = new FileReader("C:\test.txt");){
        StreamTokenizer st = new StreamTokenizer(fileReader);
        st.resetSyntax();
        int token =0;
        while((token = st.nextToken()) != StreamTokenizer.TT_EOF) {
            if(st.ttype == StreamTokenizer.TT_NUMBER) {
                System.out.println("Number: "+st.nval);
            } else if(st.ttype == StreamTokenizer.TT_WORD) {
                System.out.println("Word: "+st.sval);
            }else {
                System.out.println("Ordinary Char: "+(char)token);
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 2

要从文件中单独读取字符 "tokens"，请使用 Reader:

try (BufferedReader in = Files.newBufferedReader(Paths.get("test.txt"))) {
    for (int charOrEOF; (charOrEOF = in.read()) != -1; ) {
        String token = String.valueOf((char) charOrEOF);
        // Use token here
    }
}

为了完全支持来自补充平面的 Unicode 字符，例如表情符号，我们需要阅读代理对：

try (BufferedReader in = Files.newBufferedReader(Paths.get("test.txt"))) {
    for (int char1, char2; (char1 = in.read()) != -1; ) {
        String token = (Character.isHighSurrogate((char) char1) && (char2 = in.read()) != -1)
                      ? String.valueOf(new char[] { (char) char1, (char) char2 })
                      : String.valueOf((char) char1));
        // Use token here
    }
}

StreamTokenizer - 如何将每个字符拆分为标记

StreamTokenizer - How to split every character into tokens

java

file-io

delimiter