Answer by DaWilli for How do I create a Java string from the contents of a file?

If you're willing to use an external library, check out Apache Commons IO (200KB JAR). It contains an org.apache.commons.io.FileUtils.readFileToString() method that allows you to read an entire File into a String with one line of code.

Example:

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);}