Here you can find the source of readAll(Reader reader)
public static String readAll(Reader reader) throws IOException
//package com.java2s; /*// w w w . j a v a 2s . c o m * $Id: IOUtil.java,v 1.2 2008-06-09 11:32:37 concentus Exp $ * * Copyright 2005 Sebastian Hasait * * 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.IOException; import java.io.Reader; import java.io.StringWriter; public class Main { public static String readAll(Reader reader) throws IOException { StringWriter stringWriter = new StringWriter(); char[] cbuf = new char[1024]; int cread; do { cread = reader.read(cbuf); if (cread != -1) { stringWriter.write(cbuf, 0, cread); } } while (cread != -1); return stringWriter.getBuffer().toString(); } }