Whole text file to a String in Java

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Does Java has a one line instruction to read to a text file, like what C# has?

I mean, is there something equivalent to this in Java?:

String data = System.IO.File.ReadAllText("path to file");

If not... what is the 'optimal way' to do this...?

Edit: I prefer a way within Java standard libraries... I can not use 3rd party libraries..

Whole text file to a String in Java, lines() (to read line by line) and FileReader & BufferedReader to read text file to String. 3 Java examples to read file to string. The source code of all 3 examples for  You can convert that byte array to String to have a whole text file as String inside your Java program. If you need all lines of files as List of String e.g. into an ArrayList, you can use Files.readAllLines() method. This return a List of String, where each String represents a single line of the file.

apache commons-io has:

String str = FileUtils.readFileToString(file, "utf-8");

But there is no such utility in the standard java classes. If you (for some reason) don't want external libraries, you'd have to reimplement it. Here are some examples, and alternatively, you can see how it is implemented by commons-io or Guava.

Java Read File to String [Updated for Java 8], In this post, we will see how to read all text from a file into a String in Java. There are several ways to read contents of a file into a String using Plain Java and  Read Entire File to String – Files.readAllBytes() [≥ Java 7] readAllBytes() method reads all the bytes from a file. The method ensures that the file is closed when all bytes have been read or an I/O error, or other runtime exception, is thrown. After reading all bytes, we pass those bytes to String class constructor to create a string.

Not within the main Java libraries, but you can use Guava:

String data = Files.asCharSource(new File("path.txt"), Charsets.UTF_8).read();

Or to read lines:

List<String> lines = Files.readLines( new File("path.txt"), Charsets.UTF_8 );

Of course I'm sure there are other 3rd party libraries which would make it similarly easy - I'm just most familiar with Guava.

Read all text from a file into a String in Java, Many times you want to read contents of a file into String, but, unfortunately, it was not a trivial job in Java, at least not until JDK 1.7. In Java 8  Some example Java code to read the contents of text file into a string array, line-by-line. Here is the Java class which is used to output the string array after the file location has been passed to it: And here is some code showing the actual usage of the ReadFile class.

Java 7 improves on this sorry state of affairs with the Files class (not to be confused with Guava's class of the same name), you can get all lines from a file - without external libraries - with:

List<String> fileLines = Files.readAllLines(path, StandardCharsets.UTF_8);

Or into one String:

String contents = new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
// or equivalently:
StandardCharsets.UTF_8.decode(ByteBuffer.wrap(Files.readAllBytes(path)));

If you need something out of the box with a clean JDK this works great. That said, why are you writing Java without Guava?

How to read File into String in Java 7, 8 with Example, How do you read the contents of a file in Java? Java 8 added the Files.lines() method to produce a Stream<String>. Again, this method is lossy because line separators are stripped. If an IOException is encountered while reading the file, it is wrapped in an UncheckedIOException, since Stream doesn't accept lambdas that throw checked exceptions.

In Java 8 (no external libraries) you could use streams. This code reads a file and puts all lines separated by ', ' into a String.

try (Stream<String> lines = Files.lines(myPath)) {
    list = lines.collect(Collectors.joining(", "));
} catch (IOException e) {
    LOGGER.error("Failed to load file.", e);
}

Java read file to String, Java read file to string, BufferedReader with char array, readLine method, Files. All we have to do is append these to a StringBuilder object with newline character. The scanner class is a quick way to read a text file to string in java. This uses a java.util.Scanner, telling it to delimit the input with \Z, which is the end of the string anchor. This ultimately makes the input have one actual token, which is the entire file, so it can be read with one call to next().

Java read text file, We can use Files class to read all the contents of a file into a byte array. Files class also has a method to read all lines to a list of string. Files class is introduced in  Java read file to string using Apache Commons IO FileUtils class If you are using Apache Commons IO in your project, then this is a simple and quick way to read the file to string in java. String content = FileUtils.readFileToString(new File(fileName), StandardCharsets.UTF_8);

Different ways of Reading a text file in Java, There are several ways to read a plain text file in Java e.g. you can use FileReader, BufferedReader or BufferedReader br = new BufferedReader( new FileReader(file));. String st; Reading the whole file in a List: Read all lines from a file. In Computer Science, a file is a resource used to record data discretely in a computer’s storage device. In Java, a resource is usually an object implementing the AutoCloseable interface. Reading files and resources have many usages: * Statistics, Analytics, and Reports * Machine Learning * Dealing with large text files or logs Sometimes, these files can be absurdly large, with gigabytes or

Java – Convert File to String – Mkyong.com, Convert a File into a Stream and join it. FileToString2.java. package com.mkyong; import java.io 

Comments
  • Possible duplicate of How do I create a Java string from the contents of a file?
  • buffered reader has a read line which would be better than reading a char at a time
  • If you would use a BufferedInputStream, it would not make a difference
  • This way it adds last (-1) to the string.
  • No, it doesn't. It checks for that in while condition (c != -1)
  • This is really not cool. The return string always ends with -1 because of the careless coding around while loop.
  • I'd use the FileUtils.readFileToString(file,encoding) version - may as well recommend good habits!
  • The path in the second example is of type Path and can be retrieved from a String with var path = Paths.get(filePathAsString);
  • All of Files methods use Path; see the java.nio.file package. Paths.get() is just one way to get a Path instance.
  • And it was about frickin' time you could do this. I don't see the point in reading lines and throwing away the line end encoding.
  • Note String(byte[], String) throws an UnsupportedEncodingException. You should prefer the String(byte[], Charset) constructor along with the constants in StandardCharsets or Guava's Charsets.
  • This is a code only answer, and your answer fails to mention that it requires the buffering of all bytes before converting it to a string (i.e. it is not very memory efficient).
  • But only if you never followed the I/O stream tutorials and don't understand how to handle errors and if you want to copy all characters into a buffer before converting them to a string. Please describe your answers, code only answers are generally not upvoted.