使用Properties从文件获取属性

　　import Java.util.*;
　　import java.io.*;

　　/**
　　 * refer to http://www-900.ibm.com/developerWorks/cn/java/j-tiger02254/index_eng.sHtml  </br>
　　 * or http://www-900.ibm.com/developerWorks/cn/java/j-tiger02254/index.shtml
　　 */
　　public class LoadProperties
　　{
　　 public static void main(String[] args) throws Exception {
　　  Properties prop = new Properties();

　　  //load properties from configuration file
　　  System.out.println("From properties file:");
　　  FileInputStream fis = new FileInputStream("sample.properties");
　　  prop.load(fis);
　　     prop.list(System.out);
　　  System.out.println(" The foo property: " + prop.getProperty("foo"));
　　  
　　  //load properties from XML property file(Tiger new method)
　　  System.out.println("From xml file:");
　　  fis =new FileInputStream("sampleprops.xml");
　　  /**
　　   *<pre>The XML document must have the following DOCTYPE declaration:
　　   *<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
　　   *the dtd file :
　　   *<?xml version="1.0" encoding="UTF-8"?>
　　   *<!-- DTD for properties -->
　　   *<!ELEMENT properties ( comment?, entry* ) >
　　   *<!ATTLIST properties version CDATA #FIXED "1.0">
　　   *<!ELEMENT comment (#PCDATA) >
　　   *<!ELEMENT entry (#PCDATA) >
　　   *<!ATTLIST entry key CDATA #REQUIRED>
　　         *</pre>
　　   */
　　  prop.loadFromXML(fis);  
　　  prop.list(System.out);
　　  System.out.println(" The foo property: " + prop.getProperty("foo"));
　　  
　　  //生成xml文件
　　  System.out.println("prodUCe a xml file");
　　  prop = new Properties();
　　  prop.setProperty("one-two", "buckle my shoe");
　　  prop.setProperty("three-four", "shut the door");
　　     prop.setProperty("five-six", "pick up sticks");
　　  prop.setProperty("seven-eight", "lay them straight");
　　     prop.setProperty("nine-ten", "a big, fat hen");
　　  FileOutputStream fos = new FileOutputStream("rhyme.xml");
　　  /*
　　   *default encoding is UTF-8,
　　   * if you need specify encoding,
　　   * use storeToXML(OutputStream os,String comment,String encoding) instead
　　   */
　　  prop.storeToXML(fos, "Rhyme");//prop.storeToXML(fos, "Rhyme","GBK");
　　     fos.close();//The specified stream remains open after storeToXML() returns,so must close obviously
　　  /**
　　   *生成的xml如下（DTD如上所述）：
　　   *<?xml version="1.0" encoding="UTF-8"?>
　　   *<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
　　   *<properties>
　　   *<comment>Rhyme</comment>
　　   *<entry key="seven-eight">lay them straight</entry>
　　   *<entry key="five-six">pick up sticks</entry>
　　   *<entry key="nine-ten">a big, fat hen</entry>
　　   *<entry key="three-four">shut the door</entry>
　　   *<entry key="one-two">buckle my shoe</entry>
　　   *</properties>
　　   */
　　 }
　　}