使用Properties从文件获取属性

核心提示：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.i

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("\nThe 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("\nThe 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>
　 */
 }
}