正则表达式如何在java中用正则表达式替换txt文件中的单词

Question

我想用java替换txt文件中的一个单词。我已经有了正则表达式和从java读取txt文件的方法。但我不知道如何用mu正则表达式替换其中的一个单词

有什么建议或例子吗

Answer 1

public class BTest
{
 public static void main(String args[])
     {
     try
         {
         File file = new File("file.txt");
         BufferedReader reader = new BufferedReader(new FileReader(file));
         String line = "", oldtext = "";
         while((line = reader.readLine()) != null)
             {
             oldtext += line + "\r\n";
         }
         reader.close();
         // replace a word in a file
         String newtext = oldtext.replaceAll("drink", "Love");

         //To replace a line in a file
         //String newtext = oldtext.replaceAll("This is test string 20000", "blah blah blah");

         FileWriter writer = new FileWriter("file.txt");
         writer.write(newtext);writer.close();
     }
     catch (IOException ioe)
         {
         ioe.printStackTrace();
     }
 }

}

Answer 2

将文件解析为一个字符串。然后用新单词替换word的所有实例

 String response = "test string".replaceAll("regex here", "new text");

然后将新文本写入文件

 FileWriter writer = new FileWriter("out.txt");
 writer.write(response);