如何在Java中获取字符串中双引号之间的字符串 [英] How to get the string between double quotes in a string in Java

问题描述

例如，输入如下:

AddItem rt456 4  12 BOOK "File Structures" "Addison-Wesley" "Michael Folk"

我想使用扫描仪读取所有内容并将其放入数组中.

and I want to read all by using scanner and put it in a array.

喜欢:

   info[0] = rt456
   info[1] = 4
   ..
   ..
   info[4] = File Structures
   info[5] = Addison-Wesley

那么我怎样才能得到引号之间的字符串呢?

So how can I get the string between quotes?

我的代码的一部分->

public static void main(String[] args) {
            String command;
        String[] line = new String[6];
        Scanner read = new Scanner(System.in);
        Library library = new Library();

        command = read.next();

        if(command.matches("AddItem"))
        {
            line[0] = read.next(); // Serial Number
            line[1] = read.next(); // Shelf Number
            line[2] = read.next(); // Shelf Index
            command = read.next(); // Type of the item. "Book" - "CD" - "Magazine"

            if(command.matches("BOOK"))
            {
                line[3] = read.next(); // Name
                line[4] = read.next(); // Publisher
                line[5] = read.next(); // Author

                Book yeni = new Book(line[0],Integer.parseInt(line[1]),Integer.parseInt(line[2]),line[3],line[4],line[5]);


    }
    }
}

所以我使用 read.next 来读取没有引号的字符串.

so I use read.next to read String without quotes.

通过使用正则表达式解决

SOLVED BY USING REGEX AS

read.next("([^\"]\\S*|\".+?\")\\s*");

推荐答案

使用凌乱正则表达式的替代方案:

An alternative using a messy regular expression:

public static void main(String[] args) throws Exception {
    Pattern p = Pattern.compile("^(\\w*)[\\s]+(\\w*)[\\s]+(\\w*)[\\s]+(\\w*)[\\s]+(\\w*)[\\s]+["](.*)["][\\s]+["](.*)["][\\s]+["](.*)["]");
    Matcher m = p.matcher("AddItem rt456 4  12 BOOK "File Structures" "Addison-Wesley" "Michael Folk"");

    if (m.find()) {
        for (int i=1;i<=m.groupCount();i++) {
            System.out.println(m.group(i));
        }
    }
}

打印:

AddItem
rt456
4
12
BOOK
File Structures
Addison-Wesley
Michael Folk

我假设引号是您在问题"而不是"中键入的引号，因此不需要对它们进行转义.

I assumed quotes are as you typed them in the question "" and not "", so they dont need to be escaped.

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