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使用J2SE API读取Properties文件的六种方法(选择自 kindani 的 Blog )

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

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 = "\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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