Java中的Properties类引见

      最近在看ZK(ZooKeeper)的源码，发现源码中用到了Properties类加载配置信息，所以小研究一下：

      .properties文件是一行一行以等号分割的键值对，允许有多余的空格(所以经常取出来要用String的trim方法去除首尾多余的空格)。

       下面看个例子就行了，Properties类的使用很简单：

		InputStream inStream;
		try {
			inStream = new FileInputStream(new File("./file/test.properties"));
			Properties myProperties=new Properties();
			myProperties.load(inStream);
			
			for(Object key : myProperties.keySet()){
				System.out.println(key+"   =   "+myProperties.get(key));
			}
			
			
			OutputStream outputStream1=new FileOutputStream(new File("./file/t1.xml"));
			OutputStream outputStream2=new FileOutputStream(new File("./file/t2.properties"));
			
			myProperties.storeToXML(outputStream1, "wjy's comment");
			
			myProperties.put("nihao", "1000");
			//myProperties.put("nihao", 1000);   报错!!!
			myProperties.store(outputStream2, "my comment");
			
			inStream.close();
			outputStream1.close();
			outputStream2.close();
			
			myProperties.loadFromXML(new FileInputStream(new File("./file/t1.xml")));
			System.out.println("以下为从xml文件导入的：");
			for(Object key : myProperties.keySet())
			{
				System.out.println(key+"   =   "+myProperties.get(key));
			}
			
			
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
//运行结果：
wjy   =   nb
以下为从xml文件导入的：
nihao   =   1000
haha   =   good   
wjy   =   nb

   最后给test.properties,t1.xml和t2.properties文件截个图：

test.properties:

t1.xml:

t2.properties: