使用Java在txt文件中替换多个单词

Question

I need to replace multiple words in txt file using java. This program only replacing the only one word, in whole file.

import java.io.*;

public class MultiReplace
{
 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();
         String newtext = oldtext.replaceAll("india", "freedom");       
         FileWriter writer = new FileWriter("file.txt");
         writer.write(newtext);writer.close();
     }
     catch (IOException ioe)
         {
         ioe.printStackTrace();
        }
      }
}

Answer 1

Try this:

   import java.io.*;

    public class MultiReplace
{
 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)
             {
             // Replace in the line and append
              line = line.replaceAll("india", "freedom");
             oldtext += line + "\r\n";
         }
         reader.close();    
         FileWriter writer = new FileWriter("file.txt");
         writer.write(newtext);
         writer.flush();
         writer.close();
     }
     catch (IOException ioe)
         {
         ioe.printStackTrace();
        }
      }
    }

Refer this to understand why your version is not working.

Answer 2

Your solution is correct!! I ran your program as is and it is able to replace all the india with freedom in the text file