删除所有空格和空行

如何使用Java SE从txt文件中删除所有空格和空行？

输入：

qwe qweqwe qwe qwe 

输出：

 qwe qweqwe qwe qwe 

谢谢！

Answer 1

这样的事情怎么样：

 FileReader fr = new FileReader("infile.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 if (!line.equals("")) // don't write out blank lines { fw.write(line, 0, line.length()); } } fr.close(); fw.close(); 

注意 – 未经测试，可能不是完美的语法，但为您提供了一个想法/方法。

请参阅以下JavaDocs以供参考： http ： //download.oracle.com/javase/7/docs/api/java/io/FileReader.html http://download.oracle.com/javase/7/docs/api /java/io/FileWriter.html

Answer 2

看看trim（）函数

http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html#trim（）

此外，一些代码将有所帮助……

Answer 3

 ... Scanner scanner = new Scanner(new File("infile.txt")); PrintStream out = new PrintStream(new File("outfile.txt")); while(scanner.hasNextLine()){ String line = scanner.nextLine(); line = line.trim(); if(line.length() > 0) out.println(line); } ... 

Answer 4

删除每行的空格，不要考虑空行和空行：

 String line = buffer.readLine(); while (line != null) { line = removeSpaces(line); //ignore empty lines if (line.isEmpty()) return; ....code.... line = buffer.readLine(); } public String removeSpaces (String arg) { Pattern whitespace = Pattern.compile("\\s"); Matcher matcher = whitespace.matcher(arg); String result = ""; if (matcher.find()) { result = matcher.replaceAll(""); } return result; } 

Answer 5

用于删除同一文件中的空行。

 public static void RemoveEmptyLines(String FilePath) throws IOException { File inputFile = new File(FilePath); BufferedReader reader = new BufferedReader(new FileReader(inputFile)); String inputFileReader; ArrayList  DataArray = new ArrayList(); while((inputFileReader=reader.readLine())!=null) { if(inputFileReader.length()==0) { continue; } DataArray.add(inputFileReader); } reader.close(); BufferedWriter bw = new BufferedWriter(new FileWriter(FilePath)); for(int i=0;i 

Answer 6

 package com.home.interview; import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; public class RemoveInReadFile { public static void main(String[] args) { try { Scanner scanner = new Scanner(new File("Readme.txt")); while(scanner.hasNext()) { String line = scanner.next(); String lineAfterTrim = line.trim(); System.out.print(lineAfterTrim); } } catch (FileNotFoundException e) { e.printStackTrace(); } } }