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);

        }



    }



}
			   
			   

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