Overview
In this tutorial, we show you how to read file to string with utf-8 and split string by multiple spaces or split string by new line.
Read file to string with utf-8
There are several ways to
read a plain text file in Java, such as
BufferedReader,
java.nio.file.Files.lines() ... In this example, we can use
java.nio.file.Files.readAllBytes() method to read file content into string. The text file is stored at
C:/data/fruits.txt with following contents.
Cherry
Banana Chico fruit
Jackfruit Kiwifruit
Orange Pineapple Mango Apple
This code will read a text file into a String using java 7.
Files.readAllBytes().
String filePath = "c:/data/fruits.txt";
String contents = null;
try {
contents = new String(Files.readAllBytes(Paths.get(filePath)));
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("##### Before split");
System.out.println(contents);
Split string by new line
New line character is different in various operating systems. In Unix, New Mac Environment, lines are just separated by the character "
\n". In Windows Environment lines are just separated by the character "
\r\n". The best way to split a string by new line character using Java regex
\r?\n .
System.out.println("##### split string by new line");
String[] lines = contents.split("\\r?\\n");
for (String line : lines) {
System.out.println(line);
}
Split string by multiple spaces
To split the string with one or more whitespaces we use the "
\s+" regular expression. Let’s see the code snippet below.
System.out.println("##### Split string by multiple spaces");
String[] fruits = contents.split("\\s+");
for(String fruit : fruits) {
System.out.println(fruit);
}
Full source code Split String
See the below completed source code for Split String in Java.
package com.jackrutorial;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
public class SplitStringExample {
public static void main(String[] args) {
String filePath = "c:/data/fruits.txt";
String contents = null;
try {
contents = new String(Files.readAllBytes(Paths.get(filePath)));
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("##### Before split");
System.out.println(contents);
System.out.println("##### split string by new line");
String[] lines = contents.split("\\r?\\n");
for (String line : lines) {
System.out.println(line);
}
System.out.println("##### Split string by multiple spaces");
String[] fruits = contents.split("\\s+");
for(String fruit : fruits) {
System.out.println(fruit);
}
}
}
Console Output
##### Before split
Cherry
Banana Chico fruit
Jackfruit Kiwifruit
Orange Pineapple Mango Apple
##### split string by new line
Cherry
Banana Chico fruit
Jackfruit Kiwifruit
Orange Pineapple Mango Apple
##### Split string by multiple spaces
Cherry
Banana
Chico
fruit
Jackfruit
Kiwifruit
Orange
Pineapple
Mango
Apple
