Java Properties Load loadProperties(String name, ClassLoader loader)

Description

This will load the properties file in the current context into Properties.

License

Open Source License

Parameter

Parameter	Description
name	the name
loader	the loader

Declaration

public static void loadProperties(String name, ClassLoader loader) 

Method Source Code

//package com.java2s;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Properties;
import java.util.ResourceBundle;

public class Main {
    /** The my properties. */
    private static Properties myProperties;
    /** The Constant THROW_ON_LOAD_FAILURE. */
    private static final boolean THROW_ON_LOAD_FAILURE = true;
    /** The Constant LOAD_AS_RESOURCE_BUNDLE. */
    private static final boolean LOAD_AS_RESOURCE_BUNDLE = false;
    /** The Constant SUFFIX. */
    private static final String SUFFIX = ".properties";

    /**//from w ww.  java 2  s  .c o m
     * This will load the properties file in the current context into
     * Properties.
     * 
     * @param name
     *            the name
     * @param loader
     *            the loader
     */
    public static void loadProperties(String name, ClassLoader loader) {
        if (name == null) {
            throw new IllegalArgumentException("null input: name");
        }

        if (name.startsWith("/")) {
            name = name.substring(1);
        }

        if (name.endsWith(SUFFIX)) {
            name = name.substring(0, name.length() - SUFFIX.length());
        }

        Properties result = null;

        InputStream in = null;
        try {
            if (loader == null) {
                loader = ClassLoader.getSystemClassLoader();
            }

            if (LOAD_AS_RESOURCE_BUNDLE) {
                name = name.replace('/', '.');
                // Throws MissingResourceException on lookup failures:
                final ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault(), loader);

                result = new Properties();
                for (final Enumeration keys = rb.getKeys(); keys.hasMoreElements();) {
                    final String key = (String) keys.nextElement();
                    final String value = rb.getString(key);

                    result.put(key, value);
                }
            } else {
                name = name.replace('.', '/');

                if (!name.endsWith(SUFFIX)) {
                    name = name.concat(SUFFIX);
                }

                // Returns null on lookup failures:
                in = loader.getResourceAsStream(name);
                if (in != null) {
                    result = new Properties();
                    result.load(in);
                }
            }
        } catch (final Exception e) {
            result = null;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (final Throwable ignore) {
                    ignore.printStackTrace();
                }
            }
        }

        if (THROW_ON_LOAD_FAILURE && (result == null)) {
            throw new IllegalArgumentException("could not load [" + name + "]" + " as "
                    + (LOAD_AS_RESOURCE_BUNDLE ? "a resource bundle" : "a classloader resource"));
        }

        myProperties = result;
    }

    /**
     * A convenience overload of {@link #loadProperties(String, ClassLoader)}
     * that uses the current thread's context classloader.
     * 
     * @param name
     *            the name
     */
    public static void loadProperties(final String name) {
        loadProperties(name, Thread.currentThread().getContextClassLoader());
    }
}

Related

1. loadProperties(Properties properties, Class clazz, String propDir, String name)
2. loadProperties(Properties properties, Class baseClass, String... propertiesName)
3. loadProperties(Properties props, final Class clazz, final String resourceName)
4. loadProperties(String bucketName, String key)
5. loadProperties(String conf)
6. loadProperties(String properties)
7. loadProperties(String properties)
8. loadProperties(String propertyName)
9. loadProperties(String resource)