Java Resource Load getResource(final String resource)

Description

Reads configuration from a classpath resource stream obtained from the current thread's class loader through ClassLoader#getSystemResourceAsStream(String) .

License

Apache License

Parameter

Parameter	Description
resource	The resource to be read.

Exception

Parameter	Description
IllegalArgumentException	When the configuration file could not befound or another I/O error occurs.

Return

A object read from the specified resource.

Declaration

public static Properties getResource(final String resource)

Method Source Code

//package com.java2s;
/**//from   ww  w  . ja  v a 2  s.  co m
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.IOException;
import java.io.InputStream;

import java.util.Properties;

public class Main {
    /**
     * Reads configuration from a classpath resource stream obtained from the
     * current thread's class loader through
     * {@link ClassLoader#getSystemResourceAsStream(String)}.
     *
     * @param resource The resource to be read.
     * @return A {@link Properties} object read from the specified
     * resource.
     * @throws IllegalArgumentException When the configuration file could not be
     *                                  found or another I/O error occurs.
     */
    public static Properties getResource(final String resource) {
        InputStream input = Thread.currentThread().getContextClassLoader().getResourceAsStream(resource);
        if (input == null) {
            throw new IllegalArgumentException("configuration file '" + resource + "' not found on classpath");
        }

        final Properties config = new Properties();
        try {
            config.load(input);
        } catch (final IOException e) {
            throw new IllegalArgumentException("reading configuration from '" + resource + "' failed", e);
        }
        return config;
    }
}