使用BufferedReader读取Java中的.txt文件

Question

I'm using a BufferedReader to read a .txt files from Java but it acts strange. Some files are read normally and some return few empty lines and null or skips first few lines of text and prints rest. I checked paths, encoding, attributes, everything is the same in those files that I'm trying to read but code read one file and other wont.

System.out.println("\r\nChose desired shelf:");
String shelf = br.readLine();
FileReader fr = new FileReader("D:\\admir\\MyBookLibrary\\"+shelf+"\\Info.txt");
BufferedReader info = new BufferedReader(fr);
while(info.readLine() != null) {
    System.out.println(info.readLine());
}
fr.close();
info.close();

Answer 1

You are reading lines with readLine() twice which means you will print every second line. Also you should use try-with-resource to manage your AutoCloseable objects:

String shelf = br.readLine();
Path path = Paths.get("D:", "admir", "MyBookLibrary", shelf, "Info.txt");
try (BufferedReader br = Files.newBufferedReader(path)) {
  br.lines().forEach(System.out::println);
}

Answer 2

Since your code has info.readLine() twice, it will skip printing alternate lines for all the files. It is possible that for files that are getting printed correctly you have an empty line or linefeed character \\n after each line of text, and coincidently that is being skipped. In the other files also, it must be skipping alternate lines. Can you check the actual content of your files.

I have modified your code slightly and it works now:

System.out.println("\r\nChose desired shelf:");
String shelf = br.readLine();
FileReader fr = new 
FileReader("D:\\admir\\MyBookLibrary\\"+shelf+"\\Info.txt");
BufferedReader info = new BufferedReader(fr);
String line;
while((line = info.readLine()) != null) {
    System.out.println(line);
}
fr.close();
info.close();