java - 读写文件 - Java 空空间

Question

我想从文件中读取数据并写入文件。输入文件如下

<ORLANDO>   <0%>
    As I remember, Adam, it was upon this fashion bequeathed me by will but poor a thousand crowns, and, as thou sayest,
<ORLANDO>

"A s   I   r e m e m b e r    A d a m    i t   w a s   u p o n   t h i s   f a s h i o n   b e q u e a t h e d   m e   b y   w i l l   b u t   p o o r   a   t h o u s a n d   c r o w n s    a n d    a s   t h o u   s a y e s t    c h a r g e d   m y   b r o t h e r   o n  ..."

我编写了一个java程序来删除带有标签的行，并用空格替换任何标点符号。但是写出的每个字母之间都有一个空格，而且行之间也有很多空白行。如何去除它们？ 。请帮忙。

String line=null;
    try {
        BufferedReader br=new BufferedReader( new FileReader("filename"));
        PrintWriter writer = new PrintWriter(new FileWriter("filename"));
    try {
            while((line=br.readLine())!=null)
            {

                if(!line.contains("<"))
                {
                    line=(line.replaceAll("\\p{Punct}",""));

                    writer.println(line);
                    writer.flush();


                 }
            }
}

Answer 1

默认情况下，当您使用 PrintWriter 打开文件时，它会截断该文件。您可以将其设置为附加，但无论哪种方式，您都无法重写您正在以这种方式读取的文件。

相反，您应该创建一个新文件并写入该文件。完成后，您可以删除原始文件并重命名副本(如果完全相同，则删除副本)

But each letter that is written out has a space in between and also in between lines lots of blank lines are present.

如果您编写的是 UTF-16，但将其读取为 ASCII 或 UTF-8，则会发生这种情况。避免这种情况的方法是不使用 UTF-16，这不是默认值。

try (BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("filename"), StandardCharsets.UTF_8));
     PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream("filename.tmp"), StandardCharsets.UTF_8))) {
    for(String line; (line = br.readLine())!=null;) {
        pw.println(line.replaceAll("<[^>]+>", ""));
    }
}