Java学习路上之Properties!

public class TestProperties {
	//创建一个带有指定默认值的空属性列表
	Properties properties = new Properties();
	FileOutputStream out =null;
	InputStream in = null;
	/**
	 * 读取属性文件内容
	 */
	public void ReadPorp1(){
		//读取属性文件	
		try {
			in = new BufferedInputStream(new FileInputStream("./test.properties"));
			properties.load(in);
			//将Set转成iterator来遍历
			Iterator<String> it =properties.stringPropertyNames().iterator();
			while(it.hasNext()){
			String key = it.next();
			System.out.println(key + ":" +properties.getProperty(key));
			/**
			 * IcisReport.contextPath:192.168.3.143
			 * 有错误
			 * java.util.NoSuchElementException: Hashtable Enumerator
			 * 下面的方法是有问题的，视频中已经讲过了！除了第一个，其他元素目标无法确定
			 */
			//System.out.println(it.next() +":"+properties.getProperty(it.next()));
			in.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("读取文件报错");
		}
	
	}
	
	/**
	 * 读取属性文件2
	 */
	public void ReadPorp2(){
		try {
			in = new BufferedInputStream(new FileInputStream("./test.properties"));
			properties.load(in);
	
			Set<String> keySet = properties.stringPropertyNames();
			for(String key : keySet){
				System.out.println(key + ":"+properties.getProperty(key));
			}
			
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("读取文件报错");
		}
		
	}
	
	
	/**
	 * 写入内容到属性文件
	 * @return 
	 */
	public void WriteProp(){
		//保存属性到b.properties中！
		
		try {
			//获得test.properties的属性列表
			in = new BufferedInputStream(new FileInputStream("./test.properties"));
			properties.load(in);
			//以追加方式将所写数据保存属性到b.properties中！
			out = new FileOutputStream("./b.properties",true);
			properties.setProperty("hukr", "are you OK");
			properties.store(out, "Content--Hukr");
			out.close();
			System.out.println("写入完成");
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("写文件报错");
		}
	}

	/**
	 * 测试程序
	 * @param args
	 */
	public static void main(String[] args) {
		TestProperties testProp = new TestProperties();
		//testProp.ReadPorp1();
		//testProp.WriteProp();
		testProp.ReadPorp2();
		
	}

}