get System Property - Java java.util

Java examples for java.util:Properties File

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Description

get System Property

Demo Code

/**/*from w  w  w. j  a va2  s.  c o m*/
 * Copyright (c) 2016, Search Solution Corporation. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *   * Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 * 
 *   * Redistributions in binary form must reproduce the above copyright 
 *     notice, this list of conditions and the following disclaimer in 
 *     the documentation and/or other materials provided with the distribution.
 * 
 *   * Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products 
 *     derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */
//package com.java2s;

import java.util.Properties;

public class Main {
    public static String getSystemProperty(String key, String defaultValue,
            Properties props) {
        if (key == null) {
            return null;
        }
        String value = System.getProperty(key);
        if (value != null && value.trim().equals("") == false) {
            return value.trim();
        }
        value = System.getenv(key);
        if (value != null && value.trim().equals("") == false) {
            return value.trim();
        }

        if (props != null) {
            value = props.getProperty(key);
            if (value != null && value.trim().equals("") == false) {
                return value.trim();
            }
        }
        return defaultValue;
    }
}

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