java - 从文本文件中删除多余的空格

Question

我有以下格式的文本文件数:

196903274115371008    @266093898 

Prince George takes his first public steps with his mom,                              Catherine, Duchess of    

Cambridge.

我想删除除第一个换行符之外的所有额外空格 + 换行符。所以我想上面是这样的:

196903274115371008@266093898 

Prince George takes his first public steps with his mom, Catherine, Duchess of Cambridge.

我写了以下代码:

package remove_white_space222;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;


public class Remove_white_space222 {

    public static void main(String[] args) throws FileNotFoundException, IOException {

        FileReader fr = new FileReader("input.txt"); 
        BufferedReader br = new BufferedReader(fr); 
        FileWriter fw = new FileWriter("outfile.txt"); 
        String line;

        while((line = br.readLine()) != null)
        { 
            line = line.trim(); // remove leading and trailing whitespace
            line=line.replaceAll("\\s+", " ");
            fw.write(line);


        }
        fr.close();
        fw.close();
    }

}

在此先感谢您的帮助，，，，

Answer 1

    File file = new File("input_file.txt");
    try(BufferedReader br = new BufferedReader(new FileReader(file)); 
            FileWriter fw = new FileWriter("empty_file.txt")) {
        String st;
        while((st = br.readLine()) != null){
            fw.write(st.replaceAll("\\s+", " ").trim().concat("\n"));
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }