按空格分隔String

时间:2016-12-01 13:53:08

标签: java string parsing split word-spacing

我需要在java中用空格分隔单词,所以我按顺序使用.split函数来实现,如下所示

String keyword = "apple mango ";
String keywords [] = keyword .split(" ");

上面的代码工作正常,但唯一的问题是我有时候我的关键字会包含" jack fruit" " ice cream&#34这样的关键字; 使用双引号,如下所示

String keyword = "apple mango \"jack fruit\" \"ice cream\"";

在这种情况下,我需要获得4个词,如 apple 芒果杰克果冰淇淋在关键字数组

任何人都可以告诉我一些解决方案吗

5 个答案:

答案 0 :(得分:4)

List<String> parts = new ArrayList<>();
String keyword = "apple mango \"jack fruit\" \"ice cream\"";

// first use a matcher to grab the quoted terms
Pattern p = Pattern.compile("\"(.*?)\"");      
Matcher m = p.matcher(keyword);
while (m.find()) {
    parts.add(m.group(1));
}

// then remove all quoted terms (quotes included)
keyword = keyword.replaceAll("\".*?\"", "")
                 .trim();

// finally split the remaining keywords on whitespace
if (keyword.replaceAll("\\s", "").length() > 0) {
    Collections.addAll(parts, keyword.split("\\s+"));
}

for (String part : parts) {
    System.out.println(part);
}

<强>输出:

jack fruit
ice cream
apple
mango

答案 1 :(得分:3)

我用正则表达式和两个捕获组来做,每个模式一个。我不知道其他任何方式。

    String keyword = "apple mango \"jack fruit\" \"ice cream\"";
    Pattern p = Pattern.compile("\"?(\\w+\\W+\\w+)\"|(\\w+)");      
    Matcher m = p.matcher(keyword);
    while (m.find()) {
        String word = m.group(1) == null ? m.group(2) : m.group(1);
        System.out.println(word);
    }

答案 2 :(得分:0)

此解决方案有效,但我确信这不是性能/资源的最佳选择。当你的水果含有两个以上的单词时,它也会起作用。随意编辑或优化我的代码。

public static void main(String[] args) {
        String keyword = "apple mango \"jack fruit\" \"ice cream\" \"one two three\"";
        String[] split = custom_split(keyword);
        for (String s : split) {
            System.out.println(s);
        }
    }

    private static String[] custom_split(String keyword) {
        String[] split = keyword.split(" ");
        ArrayList<String> list = new ArrayList<>();
        StringBuilder temp = new StringBuilder();
        boolean multiple = false;
        for (String s : split) {
            if (s.startsWith("\"")) {
                multiple = true;
                s = s.replaceAll("\"", "");
                temp.append(s);
                continue;
            }
            if (s.endsWith("\"")) {
                multiple = false;
                s = s.replaceAll("\"", "");
                temp.append(" ").append(s);
                list.add(temp.toString());
                temp = new StringBuilder();
                continue;
            }
            if (multiple) {
                temp.append(" ").append(s);
            } else {
                list.add(s);
            }
        }
        String[] result = new String[list.size()];
        for (int i = 0; i < list.size(); i++) {
            result[i] = list.get(i);
        }
        return result;
    }

答案 3 :(得分:0)

您无法使用String.split()执行此操作。你需要为目标令牌提出正则表达式,并通过匹配器收集它们,如下所示:

    final Pattern token = Pattern.compile( "[^\"\\s]+|\"[^\"]*\"" );

    List<String> tokens = new ArrayList<>();
    Matcher m = token.matcher( "apple mango \"jack fruit\" \"ice cream\"" );
    while( m.find() )
        tokens.add( m.group() );

答案 4 :(得分:0)

这将在引号上拆分字符串,然后另外用空格拆分成员。

    String keyword = "apple mango \"jack fruit\" \"ice cream\"";
    String splitQuotes [] = keyword.split("\"");

    List<String> keywords = new ArrayList<>();

    for (int i = 0; i < splitQuotes.length; i++) {
        if (i % 2 == 0) {
            Collections.addAll(keywords, splitQuotes[i].split(" "));
        } else {
            keywords.add(splitQuotes[i]);
        }
    }