Here you can find the source of readAll(Reader reader)
public static String readAll(Reader reader) throws IOException
//package com.java2s; // The MIT License import java.io.BufferedReader; import java.io.IOException; import java.io.Reader; public class Main { public static String readAll(Reader reader) throws IOException { StringBuffer buffer = new StringBuffer(); BufferedReader in = new BufferedReader(reader); int ch;//w w w. j av a 2 s . c o m while ((ch = in.read()) > -1) { buffer.append((char) ch); } in.close(); return buffer.toString(); } public static String toString(Object[] array) { String s = "[Array "; if (array != null && array.length > 0) { s += array[0]; for (int i = 1; i < array.length; i++) s += "," + array[i]; } s += "]"; return s; } public static String toString(boolean b) { return b ? "true" : "false"; } }