如何从 Java 中的文件中拆分字符串

Question

我在 file.txt、|a|b|c|d| 中有一行，我想提取 | 之间的值（结果 a,b,c,d）我该怎么做？

Answer 1

Splits this string around matches of the given regular expression. This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.

The string "boo:and:foo", for example, yields the following results with these expressions:

Regex Result
: { "boo", "and", "foo" }<br> o { "b", "", ":and:f" }

使用以下代码：

String[] arr = "|a|b|c|d|".split("\|");

Answer 2

竖线（|）是正则表达式语言中的特殊字符（split方法以正则表达式为参数），需要进行转义。

您将需要使用类似这样的东西：String[] str = "|a|b|c|d|".split("\|");

鉴于此：

 String[] str = "|a|b|c|d|".split("\|");
    for(String string : str)
        System.out.println(string);

将产生：

  //The first string will be empty, since your string starts with a pipe.
a
b
c
d

Answer 3

public static void main(String[] args) throws IOException {

    FileReader fr = new FileReader(new File(
            "file.txt"));
    BufferedReader br = new BufferedReader(fr);
    String st;
    StringBuffer sb = new StringBuffer();
    st = br.readLine();
    if (st != null) {
        StringTokenizer strTkn = new StringTokenizer(st, "|");
        while (strTkn.hasMoreElements()) {
            sb.append(strTkn.nextElement());
        }
    }

    System.out.println(sb);

}

如何从 Java 中的文件中拆分字符串

How to split a string from a file in Java

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