J2SE API读取Properties文件的六种方法
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:
JProperties.java文件
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文件的六种方法 * 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
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_UShelloworld.title=Hello World!requestinfo.title=Request Information Examplerequestinfo.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 Examplerequestparams.title=Request Parameters Examplerequestparams.params-in-req=Parameters in this request:requestparams.no-params=No Parameters, Please enter somerequestparams.firstname=First Name:requestparams.lastname=Last Name:cookies.title=Cookies Examplecookies.cookies=Your browser is sending the following cookies:cookies.no-cookies=Your browser isn't sending any cookiescookies.make-cookie=Create a cookie to send to your browsercookies.name=Name:cookies.value=Value:cookies.set=You just sent the following cookie to your browser:sessions.title=Sessions Examplesessions.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 sessionsessions.dataname=Name of Session Attribute:sessions.datavalue=Value of Session Attribute: