读取Java中的结构化文件 [英] Reading Structured File in Java

问题描述

我已经编写了代码，用于读取Java中的结构化文件，并提取行内容以创建对象(Person类型).

I have written code for reading a structured file in Java, and extracting the line contents to create objects (of type Person).

文件具有以下结构:例如[personNumber]，[personName]，[personAge]

The file has the following structure: [personNumber], [personName], [personAge], for example

0，福尔摩斯，44岁

0, Sherlock Holmes, 44

1，哈利·波特，17岁

1, Harry Potter, 17

2，杰克·斯派洛(Jack Sparrow)，50岁

2, Jack Sparrow, 50

...

读取文件和提取信息的代码是:

The code for reading the file and extracting the information is:

        RandomAccessFile rf = new RandomAccessFile(fileName, "rw");
        String line;
        File myFile = new File(fileName);
        scan = new Scanner(myFile);
        String[] split;

        //Read file
        while((line = rf.readLine()) != null) {
                    split = scan.nextLine().split(", ");
                    pnumber = Integer.parseInt(split[0]);
                    name = split[1];
                    age = Integer.parseInt(split[2]);
                    thePerson = new Person(name, age, pnumber);
                    personList.addLast(thePerson);
        }

这很好用，并且将Person对象正确添加到了我编写的单链列表中.没问题.

This works well, and the Person-objects are correctly added to a singly linked list that I have programmed. No problems here.

但是，该程序还应该能够读取以下格式的文本文件:

However, the program is also supposed to be able to read a text file of the following format:

#People

0，福尔摩斯，44岁

0, Sherlock Holmes, 44

1，哈利·波特，17岁

1, Harry Potter, 17

2，杰克·斯派洛(Jack Sparrow)，50岁

2, Jack Sparrow, 50

#Dogs

0，史酷比，10

1，Milou，7

1, Milou, 7

2，疤痕，15

是否可以检查正在读取的行是否包含井号(#)，在这种情况下，程序会了解到它不是要拆分此行，而是只是在开始一个新类别?这样您就可以从以下几行中决定要创建哪种类型的对象，例如，人或狗对象.为简单起见，类型(人，狗)的顺序将始终相同，但是每个类别后面的行数将有所不同.因此，我需要确定行中是否包含#符号，以指示新类别的开始，并且仅从以下几行创建对象.

推荐答案

，或者如果#始终位于字符串的开头:

or if your # is always at the beginning of the string:

编辑:

while((line = rf.readLine()) != null) {
    if(line.charAt(0)=='#'){
        scan.nextLine(); //use it to suit your need..
        //alert the program to prepare for new type of object
        //do something..
    }else {
        split = scan.nextLine().split(", ");
                pnumber = Integer.parseInt(split[0]);
                name = split[1];
                age = Integer.parseInt(split[2]);
                thePerson = new Person(name, age, pnumber);
                personList.addLast(thePerson);
    }
}

这篇关于读取Java中的结构化文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！