从字节数组中提取int。

/*

 * Copyright The Sett Ltd, 2005 to 2014.

 *

 * 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.

 */

//package com.nowjava;/*N  o w  J a v a . c o m 提供*/


public class Main {

    public static void main(String[] argv) throws Exception {

        byte[] buf = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };

        int offset = 2;

        System.out.println(getIntFromBytes(buf, offset));

    }


    /**

     * Extracts an int from an array of bytes.

     *

     * @param  buf    The array of bytes to extract the int from.

     * @param  offset The offset of the start of the int in the byte array.

     *

     * @return An integer extracted from the 4 bytes of data.

     */

    public static int getIntFromBytes(byte[] buf, int offset) {

        int r