写入文件时插入换行符？ [英] Insert line break when writing to file?

问题描述

所以我的代码看起来像这样：

  try {
 while（（line = br.readLine（） ）！= null）{
 Matcher m = urlPattern.matcher（line）; （m.find（））{
 System.out.println（m.group（1））; 
 while 
 
 // println在每次查找后放入换行符
 
 String filename =page.txt; 
 FileWriter fw = new FileWriter（filename，true）; 
 fw.write（m.group（1））; 
 fw.close（）; 
 
 // fw在每次查找之后写入所有内容而不换行
} 
} 
  

我在 System.out.println（m.group（1））; 处得到正确的输出形式。希望写出 m.group（1）所显示的内容，因为代码中没有换行符，所以它不会写入换行符。

只要调用 fw.write（System.getProperty（line.separator））; 。

System.getProperty（line.separator）会为您提供您的平台的行分隔符（无论是Windows还是一些Unix风格）。

So My code looks like this:

try {
    while ((line = br.readLine()) != null) {
        Matcher m = urlPattern.matcher (line);
        while (m.find()) {
            System.out.println(m.group(1));

            //the println puts linebreak after each find

            String filename= "page.txt";
            FileWriter fw = new FileWriter(filename,true);
            fw.write(m.group(1));
            fw.close();

            //the fw writes everything after each find with no line break
    }
}

I get right form of output at line System.out.println(m.group(1)); However when I later on want to write what is shown by m.group(1) It writes to file without putting linebreak since the code doesn't have one.

解决方案

Just call fw.write(System.getProperty("line.separator"));.

System.getProperty("line.separator") will give you the line separator for your platform (whether Windows or some Unix flavor).

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