NotePad无法使用PrintStream输出到文本文件来识别java代码中的新行字符

Question

我需要一些帮助学校的java项目.请参阅下面的代码,了解Book和BookApplication类,以及输入文本文件和所需的输出文本文件.

我的输出文件有问题.当我在Word或写字板或NotePad ++中打开它时,文件格式正确.但是当我在NotePad中打开文件时,报告全部都在一行上.

由于某种原因,NotePad无法识别新的行字符.有什么想法吗？如何更改Java代码以便NotePad正确显示报告？我是一个Java菜鸟,我在这个Java课程中真的很挣扎.您可以提供的任何帮助将非常感激.谢谢.

名为inBook.txt的输入文本文件如下所示:

Java简介0123444555680 Tony Gaddis TG003 Javascript简介9780071632969 John Pollock JP402游戏开发基础9780763778 Heather Maxwell Chandler HC026

名为outBook.txt的输出文本文件需要完全按如下方式读取:

Dean Publishers - 书籍清单

Java简介:Tony Gaddis(TG003)ISBN:0123444555680

Javascript简介作者:John Pollock(JP402)ISBN:9780071632969

游戏开发的基础由Heather Maxwell Chandler(HC026)ISBN:9780763778

我们目前的目录有3本书.

感谢您的关注.

// Book.java

public class Book {

    public static final String BOOK_PUBLISHER = "Dean Publishers";

    private String bookTitle;
    private String bookISBN;
    private Author bookAuthor;

    Book(String inTitle) {
        setBookTitle(inTitle);
        setBookISBN("0");
        setBookAuthor("");
    }

    public void setBookTitle(String inTitle) {
        bookTitle = inTitle;
    }

    public void setBookISBN(String inISBN) {
        bookISBN = inISBN;
    }

    public void setBookAuthor(String inName) {
        bookAuthor = new Author(inName);
    }

    public void setBookAuthorID(String inID) {
        bookAuthor.setAuthorID(inID);
    }

    public String getBookTitle() {
        return bookTitle;
    }

    public String getBookISBN() {
        return bookISBN;
    }

    public Author getAuthor() {
        return bookAuthor;
    }

    public String getAuthorName() {
        return bookAuthor.getAuthorName();
    }

    public String getAuthorID() {
        return bookAuthor.getAuthorID();
    }

    //inner class
    class Author {
        private String authorName; //instance property
        private String authorID; //instance property

        //constructor
        Author(String inName)  {
            setAuthorName(inName);
            setAuthorID("0");
        }

        public void setAuthorName(String inName) {
            authorName = inName;
        }

        public void setAuthorID(String inID) {
            authorID = inID;
        }

        public String getAuthorName() {
            return authorName;
        }

        public String getAuthorID() {
            return authorID;
        }
    } //end inner Author class

} //end Book class

BookApplication.java

import java.util.*;
import java.io.*;

public class BookApplication {

    public static void main(String[] args) throws IOException {
        // Create Book object for each book in the file and store them in array.
        Scanner filein = new Scanner(new File("inBook.txt"));

        // I will use ArrayList, a dynamic-size array
        ArrayList<Book> books = new ArrayList<Book>();

        while(filein.hasNextLine()) {
              // read book data
              String title = filein.nextLine();
              String isbn = filein.nextLine();
              String author = filein.nextLine();
              String authorID = filein.nextLine();

              // create new book from input
              Book temp = new Book(title);
              temp.setBookISBN(isbn);
              temp.setBookAuthor(author);
              temp.getAuthor().setAuthorID(authorID);

              // add to arraylist
              books.add(temp);
        }

        // Create an output report by reading the Book objects from the array.
        String output = "";
        for(Book book : books) {
           output += book.getBookTitle() + "\n";
           output += "By "+book.getAuthor().getAuthorName() + " (" + book.getAuthor().getAuthorID() + ")\n";
           output += "ISBN: " + book.getBookISBN() + "\n\n";
        }

        // Report prints to console
        System.out.println(output);

        // Report prints to file called outBook.txt
        PrintStream fileout = new PrintStream(new File("outBook.txt"));
        fileout.println(output);
        fileout.close();

        // Count the number of books outputted to the report.
        System.out.println("Our current catalog has " + books.size() + " books.");
        System.out.println("\nThank you for your interest.");

    } // end main method
} // end BookApplication

Answer 1

您正在使用\n新行的字符,这对于*nix是正确的.在Windows中它是\r\n.如果您不想担心自己所处的平台,可以使用:

System.getProperty("line.separator")

获得该令牌.这样你的程序就可以在任何平台上运行.

更新:在Java 7中,您可以使用System.lineSeparator().

Answer 2

你需要Windows上的\r\n(0x0D 0x0A)结束一行,并在它们两对输出一个空行.

Answer 3

尝试使用系统行分隔符(如所述,在Windows中为\ r \n)

String nl = System.getProperty("line.separator")
output += book.getBookTitle() + nl;
...