使用J2SEAPI讀取Properties文件的六種方法

2019-11-18 11:18:27

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　　使用J2SE API讀取PRoperties文件的六種方法
　　
　　1.使用java.util.Properties類的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類的getBundle()方法
　　
　　示例： ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());
　　
　　3.使用java.util.PropertyResourceBundle類的構造函數
　　
　　示例： InputStream in = new BufferedInputStream(new FileInputStream(name));
　　ResourceBundle rb = new PropertyResourceBundle(in);
　　
　　4.使用class變量的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類的getSystemResourceAsStream()靜態方法
　　
　　示例： InputStream in = ClassLoader.getSystemResourceAsStream(name);
　　Properties p = new Properties();
　　p.load(in);
　　
　　補充
　　
　　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，可以參考附件文件
　　
　　如何上傳文件，誰知道請告訴以下。只好把source都貼上來了
　　
　　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

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