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使用J2SEAPI读取Properties文件的六种方法

 2008-01-05 18:51:23 来源:WEB开发网   
核心提示: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 Prope

  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臻取Properties文件的六肺方法
  * 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

Tags:使用 JSEAPI 读取

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