java如何从指定符号的字符串中获取列表？

Question

example I have a string

"123<a>3213<b>3434343<c>,example <d><1><2><3>"

I want to get the inner text by the symbol "<>"

how can I get the list [a,b,c,d,1,2,3] ???

Answer 1

您可以使用StringUtils.substringsBetween（String str，String open，String close） 。

String[] parts = StringUtils.substringsBetween("123<a>3213<b>3434343<c>,example <d><1><2><3>", "<", ">");

Answer 2

You want the text between <..> . Use a Pattern and Matcher over the given String while grouping the text between <..>

String text = "123<a>3213<b>3434343<c>,example <d><1><2><3>";
Pattern pattern = Pattern.compile("<(.*?)>"); // reluctant quantifier
Matcher matcher = pattern.matcher(text);
List<String> entries = new LinkedList<>();
while (matcher.find()) 
    entries.add(matcher.group(1)); // group 0 is the whole match, we only want what's between <>
System.out.println(entries);

This prints

[a, b, c, d, 1, 2, 3]

Answer 3

Untested, hardly bullet proof, little error checking, but it should work. Of course things could be better, this is just from memory.

public List<String> getThings(String source) {
    char[] chars = source.toCharArray();
    boolean capturing = false;
    List<String> result = new ArrayList<String>();
    String token = "";

    for(char c : chars) {
        if (!capturing) {
            if (c == '<') { // found open delimiter, start capture.
                capturing = true;
                continue;
            }
        } else {
            if (c == '>') { // Found closing delimiter, stop capture.
                results.add(token);
                token = "";
                capturing = false;
                continue;
            }
            token = token + c;
        }
    }
    if (!scanning) {
        throw new RuntimeException("Source string ended with missing closing '>'");
    }
    return results;
}