Java FileInputStream Read readFile( String filename)

Description

Reads the contents of the file with the given name, returning a String.

License

Open Source License

Parameter

Parameter	Description
filename	The file to be read

Exception

Parameter	Description
IOException	an exception

Return

The contents of the file

Declaration

static publicString readFile(
        String filename) throws java.io.IOException 

Method Source Code

//package com.java2s;
/*/*w  w  w.  j  a va2  s.c o m*/
 * Copyright (C) 2000-2001 Iowa State University
 *
 * This file is part of mjc, the MultiJava Compiler, adapted for ESC/Java2.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * $Id: JUnitUtils.java 71450 2008-04-10 10:31:38Z dcochran $
 * Author: David R. Cok
 */

public class Main {
    /** Reads the contents of the file with the given name, returning a String.
     This is an optimized version that uses the byte array provided and 
     presumes that the file is shorter than the length of the array.
             
     @param filename      The file to be read
     @param cb      A temporary byte array to speed reading
             
     @return         The contents of the file
     @throws java.io.IOException
     */
    // FIXME - can we check that the file is too long without losing the efficiency benefits?
    static public/*@ non_null */String readFile(
    /*@ non_null */String filename, /*@ non_null */byte[] cb)
            throws java.io.IOException {
        int i = 0;
        int j = 0;
        java.io.FileInputStream f = null;
        try {
            f = new java.io.FileInputStream(filename);
            while (j != -1) {
                i = i + j;
                j = f.read(cb, i, cb.length - i);
            }
        } finally {
            if (f != null)
                f.close();
        }
        return new String(cb, 0, i);
    }

    /** Reads the contents of the file with the given name, returning a String. 
     This version presumes the file is shorter than an internal buffer.
     FIXME
             
     @param filename      The file to be read
     @return             The contents of the file
     @throws IOException
     */
    static public/*@ non_null */String readFile(
    /*@ non_null */String filename) throws java.io.IOException {
        StringBuffer sb = new StringBuffer(10000);
        char[] cb = new char[10000]; // This hard-coded value can be anything;
        // smaller numbers will be less efficient since more reads
        // may result
        int j = 0;
        java.io.FileReader f = null;
        try {
            f = new java.io.FileReader(filename);
            while (j != -1) {
                j = f.read(cb, 0, cb.length);
                if (j != -1)
                    sb.append(cb, 0, j);
            }
        } finally {
            if (f != null)
                f.close();
        }
        return sb.toString();
    }
}

Related

1. loadData(File f)
2. loadFolderFromJar(String path)
3. loadRes(String res)
4. loadStackableItems(String fileName)
5. loadTxtFile(String fileName)
6. readFile(File f)
7. readFile(File f)
8. readFile(File f)
9. readFile(File f)