Java FileInputStream Read readFile(File file)

Description

Reads entire file into byte array.

License

Open Source License

Parameter

Parameter	Description
file	File to read.

Exception

Parameter	Description
IOException	If failed.

Return

Content of file in byte array.

Declaration

public static byte[] readFile(File file) throws IOException 

Method Source Code

//package com.java2s;
/* //from   w ww.  j ava2 s.  c om
 Copyright (C) GridGain Systems. All Rights Reserved.
     
 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.*;

public class Main {
    /**
     * Reads entire file into byte array.
     *
     * @param file File to read.
     * @return Content of file in byte array.
     * @throws IOException If failed.
     */
    public static byte[] readFile(File file) throws IOException {
        assert file.exists();
        assert file.length() < Integer.MAX_VALUE;

        byte[] bytes = new byte[(int) file.length()];

        try (FileInputStream fis = new FileInputStream(file)) {
            int readBytesCnt = fis.read(bytes);
            assert readBytesCnt == bytes.length;
        }

        return bytes;
    }
}

Related

1. readFile(File file)
2. readFile(File file)
3. readFile(File file)
4. readFile(File file)
5. readFile(File file)
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7. readFile(File file)
8. readFile(File file)
9. readFile(File file)