使用J2SE API读取Properties文件的六种方法

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使用J2SE API读取Properties文件的六种方法

发表于：2008年5月3日 17时58分5秒阅读(4)评论(0)本文链接：http://user.qzone.qq.com/169188811/blog/1209808685

[align=center]使用J2SE API读取Properties文件的六种方法[/align] 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 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読取Properties文件的六種方法 * 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; } */ // ---------------------------------------------- support class /** * ResourceBundle Adapter class. */ public static class ResourceBundleAdapter extends Properties { public ResourceBundleAdapter(ResourceBundle rb) { assert (rb instanceof java.util.PropertyResourceBundle); this.rb = rb; java.util.Enumeration e = rb.getKeys(); while (e.hasMoreElements()) { Object o = e.nextElement(); this.put(o, rb.getObject((String) o)); } } private ResourceBundle rb = null; public ResourceBundle getBundle(String baseName) { return ResourceBundle.getBundle(baseName); } public ResourceBundle getBundle(String baseName, Locale locale) { return ResourceBundle.getBundle(baseName, locale); } public ResourceBundle getBundle(String baseName, Locale locale, ClassLoader loader) { return ResourceBundle.getBundle(baseName, locale, loader); } public Enumeration<String> getKeys() { return rb.getKeys(); } public Locale getLocale() { return rb.getLocale(); } public Object getObject(String key) { return rb.getObject(key); } public String getString(String key) { return rb.getString(key); } public String[] getStringArray(String key) { return rb.getStringArray(key); } protected Object handleGetObject(String key) { return ((PropertyResourceBundle) rb).handleGetObject(key); } } } JPropertiesTest.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.test; import junit.framework.*; import com.kindani.JProperties; //import javax.servlet.ServletContext; import java.util.Properties; public class JPropertiesTest extends TestCase { JProperties jProperties; String key = "helloworld.title"; String value = "Hello World!"; public void testLoadProperties() throws Exception { String name = null; Properties p = new Properties(); name = "C://IDEAP//Properties4Methods//src//com//kindani//test//LocalStrings.properties"; p = JProperties.loadProperties(name, JProperties.BY_PROPERTIES); assertEquals(value, p.getProperty(key)); name = "com.kindani.test.LocalStrings"; p = JProperties.loadProperties(name,JProperties.BY_RESOURCEBUNDLE); assertEquals(value, p.getProperty(key)); assertEquals(value,((JProperties.ResourceBundleAdapter)p).getString(key)); name = "C://IDEAP//Properties4Methods//src//com//kindani//test//LocalStrings.properties"; p = JProperties.loadProperties(name, JProperties.BY_PROPERTYRESOURCEBUNDLE); assertEquals(value, p.getProperty(key)); assertEquals(value,((JProperties.ResourceBundleAdapter)p).getString(key)); name = "file://com//kindani//test//LocalStrings.properties"; p = JProperties.loadProperties(name, JProperties.BY_SYSTEM_CLASSLOADER); assertEquals(value, p.getProperty(key)); name = "file://com//kindani//test//LocalStrings.properties"; p = JProperties.loadProperties(name, JProperties.BY_CLASSLOADER); assertEquals(value, p.getProperty(key)); name = "test//LocalStrings.properties"; p = JProperties.loadProperties(name, JProperties.BY_CLASS); assertEquals(value, p.getProperty(key)); } /* public void testLoadProperties2() throws Exception { ServletContext context = null; String path = null; Properties p = null; path = "/WEB-INF/classes/LocalStrings.properties"; p = JProperties.loadProperties(context, path); assertEquals(value, p.getProperty(key)); } */ } properties文件与JPropertiesTest.java文件相同的目录下 LocalStrings.properties文件 # $Id: LocalStrings.properties,v 1.1 2000/08/17 00:57:52 horwat Exp $ # Default localized resources for example servlets # This locale is en_US helloworld.title=Hello World! requestinfo.title=Request Information Example requestinfo.label.method=Method: requestinfo.label.requesturi=Request URI: requestinfo.label.protocol=Protocol: requestinfo.label.pathinfo=Path Info: requestinfo.label.remoteaddr=Remote Address: requestheader.title=Request Header Example requestparams.title=Request Parameters Example requestparams.params-in-req=Parameters in this request: requestparams.no-params=No Parameters, Please enter some requestparams.firstname=First Name: requestparams.lastname=Last Name: cookies.title=Cookies Example cookies.cookies=Your browser is sending the following cookies: cookies.no-cookies=Your browser isn’t sending any cookies cookies.make-cookie=Create a cookie to send to your browser cookies.name=Name: cookies.value=Value: cookies.set=You just sent the following cookie to your browser: sessions.title=Sessions Example sessions.id=Session ID: sessions.created=Created: sessions.lastaccessed=Last Accessed: sessions.data=The following data is in your session: sessions.adddata=Add data to your session sessions.dataname=Name of Session Attribute: sessions.datavalue=Value of Session Attribute:

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