找不到符号IOUtils

Question

Basically I am trying to take information from a text file and turn it into a string. The code I have is:

FileInputStream inputStream = new FileInputStream("filename.txt");
try 
{
  String everything = IOUtils.toString(inputStream);
} 
finally 
{
  inputStream.close();
}

the error message I get is -->

java:53: cannot find symbol
symbol  : class IOUtils
location: class CheckSystem

I assumed this was because of my imports, but I have io and util and even text imported (just as below)

import java.util.*;

import java.text.*;

import java.io.*;

Why can't I access the IOUtils class and its methods? If that cannot be answered, an alternative but very simple means of reading a text file into a string would be fine.

Answer 1

You don't need anything outside of standard JDK to read from a text file easily and efficiently. For example you can do so like this:

BufferedReader br = new BufferedReader(new FileReader("file.txt"));
try {
    StringBuilder sb = new StringBuilder();
    String line = br.readLine();

    while (line != null) {
        sb.append(line);
        sb.append(System.lineSeparator());
        line = br.readLine();
    }
    String everything = sb.toString();
} catch(IOException e) {
  }
  finally {
    br.close();
}

taken from: Reading a plain text file in Java

The everything String contains the contents of the file.txt , which must be located in the same directory as where the java class file is being run from.