In Java, you can use BufferedReader + InputStreamReader to convert InputStream to String.

InputStreamToStringExample.java

package com.mkyong.core;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class InputStreamToStringExample {

	public static void main(String[] args) throws IOException {

		// intilize an InputStream
		InputStream is = 
                     new ByteArrayInputStream("file content..blah blah".getBytes());

		String result = getStringFromInputStream(is);

		System.out.println(result);
		System.out.println("Done");

	}

	// convert InputStream to String
	private static String getStringFromInputStream(InputStream is) {

		BufferedReader br = null;
		StringBuilder sb = new StringBuilder();

		String line;
		try {

			br = new BufferedReader(new InputStreamReader(is));
			while ((line = br.readLine()) != null) {
				sb.append(line);
			}

		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (br != null) {
				try {
					br.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

		return sb.toString();

	}

}

Output


file content..blah blah
Done