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javalearner

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�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;
     }
*/     // ---------------------------------------------- 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: