How do I create a Java string from the contents of a file? convert file to Java String.


How do I create a Java string from the contents of a file? convert the file to Java String.

The following a possible way for getting data from the file as a String form.
Read all text from a file
First Solution:-
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

String content = new String(Files.readAllBytes(Paths.get("readMe.txt")), StandardCharsets.UTF_8);

Second Solution:-
Guava has a method similar to the one from Commons IOUtils that Williams Rohr mentioned:
import com.google.common.base.Charsets;
import com.google.common.io.Files;
// ...
String text = Files.toString(new File(path), Charsets.UTF_8);

Third Solution:-
Java 11 added the readString() method to read small files as a String, preserving line terminators:
String content = Files.readString(path, StandardCharsets.US_ASCII);
For versions between Java 7 and 11, here's a compact, robust the idiom, wrapped up in a utility method:
static String readFile(String path, Charset encoding)
  throws IOException
{
  byte[] encoded = Files.readAllBytes(Paths.get(path));
  return new String(encoded, encoding);
}

4th Solution:-
A very lean solution based on Scanner:
Scanner scanner = new Scanner( new File("poem.txt") );
String text = scanner.useDelimiter("\\A").next();
scanner.close(); // Put this call in a finally block
Or, if you want to set the charset:
Scanner scanner = new Scanner( new File("poem.txt"), "UTF-8" );
String text = scanner.useDelimiter("\\A").next();
scanner.close(); // Put this call in a finally block

5th Solution:-
import java.io.*;
import java.nio.charset.*;
import org.apache.commons.io.*;
 
public String readFile() throws IOException {
    File file = new File("data.txt");
    return FileUtils.readFileToString(file, StandardCharsets.UTF_8);
}

Comments

Post a Comment

Popular posts from this blog

What is SIP or Session Initiation Protocol ?

Image
The Session Initiation Protocol ( SIP ) is a signalling protocol which is basically used for creating , controlling and destroying real time sessions. in that session include voice video and messaging. sip protocol is deigned for controlling multimedia session over the internet protocol. for example in present we are using too many app for communications like whats app , Skype. mainly theses application using sip protocol for there communication.  It is application layer protocol that works with many of other protocol like HTTP and SMTP. Whats app, Skype based on VoIP technology that means voice over Internet protocol . When two devices are communicating with each other on IP it is called VoIP. The Sip protocol control multimedia commutations session over internet protocol.                                                            ...
Read more

How To Create An Object In Java ?

In this article, you will learn how to create an object in java along with accessing instance variables and methods of a class through created object.  Let us first dive into the concepts of classes and objects. Class-  A class serves as a blueprint for creating objects. It contains properties(variables) and methods(functions) that determines the state or behaviour of an object. A class is created by declaring the keyword ‘class’ followed by the ‘name of the class’. For example: class  Cuboid { // class body } The body of the class is contained between two curly braces. Object-  An Object may be defined as the sample of a class showing state or behaviour. In simple words, an object is created from a class. CREATING A CLASS IN JAVA A class in java can be created by using the keyword class followed by the name of the class. The members of the class(properties and methods) are declared under the curly braces as shown below in the example. public cl...
Read more

How do I declare and initialize an array in Java?

Creating an array of objects in Java? How to initialize an array in Java? You can either use array declaration or array literal (but only when you declare and affect the variable right away, array literals cannot be used for re-assigning an array). For primitive types: int [] myIntArray = new int [ 3 ]; int [] myIntArray = { 1 , 2 , 3 }; int [] myIntArray = new int []{ 1 , 2 , 3 }; For classes, for example  String , it's the same: String [] myStringArray = new String [ 3 ]; String [] myStringArray = { "a" , "b" , "c" }; String [] myStringArray = new String []{ "a" , "b" , "c" }; The third way of initializing is useful when you declare the array first and then initialize it. The cast is necessary here. String [] myStringArray ; myStringArray = new String []{ "a" , "b" , "c" };
Read more