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[转载]使用J2SE API读取Properties文件的方法

原创 Linux操作系统 作者:dinner1007 时间:2019-05-22 21:18:04 0 删除 编辑
使用J2SE API读取Properties文件的方法
1、使用java.util.Properties类的load()方法

示例:

cellspacing="0" cellpadding="2" bordercolorlight = "black" bordercolordark = "#FFFFFF" align="center">
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);


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 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 = "\com\kindani\test\
		LocalStrings.properties";
        p = JProperties.loadProperties(name, JProperties.BY_SYSTEM_CLASSLOADER);
        assertEquals(value, p.getProperty(key));

        name = "\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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