Here you can find the source of readFile(final File file)
public static String readFile(final File file)
//package com.java2s; /*//from w ww . j av a 2 s .c om * Copyright 2014 Red Hat, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; public class Main { public static String readFile(final File file) { try { return readFile(new FileInputStream(file)); } catch (IOException e) { throw new RuntimeException(e); } } public static String readFile(InputStream file) { try (final BufferedInputStream stream = new BufferedInputStream(file)) { byte[] buff = new byte[1024]; StringBuilder builder = new StringBuilder(); int read = -1; while ((read = stream.read(buff)) != -1) { builder.append(new String(buff, 0, read)); } return builder.toString(); } catch (IOException e) { throw new RuntimeException(e); } } }