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 [J2SE]使用J2SE API读取Properties文件的六种方法
文章收藏, 网上资源, 软件技术
tone 发表于 2007/2/26 9:57:01 |
| 转自http://www.javanb.com/j2se/1/5253.html
使用J2SE API读取Properties文件的六种方法
1。使用java.util.Properties类的load()方法 示例： InputStream in = lnew BufferedInputStream(new FileInputStream(name)); Properties p = new Properties(); p.load(in);
2。使用java.util.ResourceBundle类的getBundle()方法 示例：ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());
3。使用java.util.PropertyResourceBundle类的构造函数 示例： InputStream in = new BufferedInputStream(new FileInputStream(name)); ResourceBundle rb = new PropertyResourceBundle(in);
4。使用class变量的getResourceAsStream()方法 示例： InputStream in = JProperties.class.getResourceAsStream(name); Properties p = new Properties(); p.load(in);
5。使用class.getClassLoader()所得到的java.lang.ClassLoader的getResourceAsStream()方法 示例： InputStream in = JProperties.class.getClassLoader().getResourceAsStream(name); Properties p = new Properties(); p.load(in);
6。使用java.lang.ClassLoader类的getSystemResourceAsStream()静态方法 示例： InputStream in = ClassLoader.getSystemResourceAsStream(name); Properties p = new Properties(); p.load(in);
补充
Servlet中可以使用javax.servlet.ServletContext的getResourceAsStream()方法 示例：InputStream in = context.getResourceAsStream(path); Properties p = new Properties(); p.load(in);
完整的示例，可以参考附件文件 如何上传文件，谁知道请告诉以下。 只好把source都贴上来了 JProperties.java文件
/** ** This program is free software. ** ** You may redistribute it and/or modify it under the terms of the GNU ** General Public License as published by the Free Software Foundation. ** Version 2 of the license should be included with this distribution in ** the file LICENSE, as well as License.html. If the license is not ** included with this distribution, you may find a copy at the FSF web ** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the ** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA. ** ** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND, ** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR ** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY ** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR ** REDISTRIBUTION OF THIS SOFTWARE. **/
package com.kindani;
//import javax.servlet.ServletContext; import java.util.*; import java.io.InputStream; import java.io.IOException; import java.io.BufferedInputStream; import java.io.FileInputStream;
/** * 使用J2SE API?取Properties文件的六?方法 * User: SYNFORM * Date: 2005/07/12 * Time: 18:40:55 * To change this template use File | Settings | File Templates. */ public class JProperties {
public final static int BY_PROPERTIES = 1; public final static int BY_RESOURCEBUNDLE = 2; public final static int BY_PROPERTYRESOURCEBUNDLE = 3; public final static int BY_CLASS = 4; public final static int BY_CLASSLOADER = 5; public final static int BY_SYSTEM_CLASSLOADER = 6;
public final static Properties loadProperties(final String name, final int type) throws IOException { Properties p = new Properties(); InputStream in = null; if (type == BY_PROPERTIES) { in = new BufferedInputStream(new FileInputStream(name)); assert (in != null); p.load(in); } else if (type == BY_RESOURCEBUNDLE) { ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault()); assert (rb != null); p = new ResourceBundleAdapter(rb); } else if (type == BY_PROPERTYRESOURCEBUNDLE) { in = new BufferedInputStream(new FileInputStream(name)); assert (in != null); ResourceBundle rb = new PropertyResourceBundle(in); p = new ResourceBundleAdapter(rb); } else if (type == BY_CLASS) { assert (JProperties.class.equals(new JProperties().getClass())); in = JProperties.class.getResourceAsStream(name); assert (in != null); p.load(in); // return new JProperties().getClass().getResourceAsStream(name); } else if (type == BY_CLASSLOADER) { assert (JProperties.class.getClassLoader().equals(new JProperties().getClass().getClassLoader())); in = JProperties.class.getClassLoader().getResourceAsStream(name); assert (in != null); p.load(in); // return new JProperties().getClass().getClassLoader().getResourceAsStream(name); } else if (type == BY_SYSTEM_CLASSLOADER) { in = ClassLoader.getSystemResourceAsStream(name); assert (in != null); p.load(in); }
if (in != null) { in.close(); } return p;
}
// ---------------------------------------------- servlet used /* public static Properties loadProperties(ServletContext context, String path) throws IOException { assert (context != null); InputStream in = context.getResourceAsStream(path); assert (in != null); Properties p = new Properties(); p.load(in); in.close(); return p; } */ |
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