如何在 Java 中向字节数组添加换行符？
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How to add newline character to a byte array in Java?
提问by Chaipau
The following piece of code tries to introduce a newline character into a byte array and write the byte array to a file.
以下代码尝试将换行符引入字节数组并将字节数组写入文件。
import java.io.*;
public class WriteBytes {
public static void main(String args[]) {
byte[] cities = { 'n', 'e', 'w', 'y', 'o', 'r', 'k', '\n', 'd', 'c' };
FileOutputStream outfile = null;
try {
outfile = new FileOutputStream("newfile.txt");
outfile.write(cities);
outfile.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
Contents of the newfile were: newyorkdc
新文件的内容是： newyorkdc
What I expected was:
newyork
dc
我的预期是：
纽约
dc
I tried to typecast '\n'to (byte)'\n'but to no avail.
我试图打字'\n'，(byte)'\n'但无济于事。
Solution: Change the array initialization to
解决方法：将数组初始化改为
byte[] cities = { 'n', 'e', 'w', 'y', 'o', 'r', 'k', '\r','\n', 'd', 'c' };
I had used Notepad++ to view the contents of the file.I suppose it suppressed the newline character but accepted the carriage return followed by newline combination.
我曾使用 Notepad++ 查看文件的内容。我想它抑制了换行符，但接受了回车，然后是换行符组合。
回答by Telcontar
New line character is OS dependant, you should retrieve it calling System.getProperty("line.separator")
换行符取决于操作系统，您应该调用 System.getProperty("line.separator") 检索它
Or better, if you are writing a textfile you should use BufferedWriterwhich has the method newLine() to write the line separator independent of the OS
或者更好的是，如果您正在编写文本文件，则应该使用具有 newLine() 方法的BufferedWriter来编写独立于操作系统的行分隔符
回答by Niklas
You can prove it works by reading and printing the file.
您可以通过阅读和打印文件来证明它有效。
import java.io.*;
public class Main {
public static void main(String args[]) {
String filename = "newfile.txt";
byte[] cities = {'n', 'e', 'w', 'y', 'o', 'r', 'k', '\n', 'd', 'c'};
FileOutputStream outfile = null;
try {
outfile = new FileOutputStream(filename);
outfile.write(cities);
outfile.close();
BufferedReader in = new BufferedReader(new FileReader(filename));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
byte[] cities2 = {'n', 'e', 'w', 'y', 'o', 'r', 'k', 'd', 'c'};
outfile = null;
try {
outfile = new FileOutputStream(filename);
outfile.write(cities2);
outfile.close();
BufferedReader in = new BufferedReader(new FileReader(filename));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Test
测试
newyork
dc
newyorkdc
