@Test
public void printTest(){
    Properties properties=System.getProperties();
    properties.list(System.out);
}

@Test
public void name1Test(){
    try{
        Properties properties=new Properties();
        //用的是磁盤(pán)符的絕對(duì)路徑 
        InputStream input=new BufferedInputStream(new FileInputStream("D:\\workspace\\JavaLearn\\src\\jdbc.properties"));
        properties.load(input);
        properties.list(System.out);
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Test
public void name2Test(){
    try{
        Properties properties=new Properties();  // 用/文件名， / 表示根目錄
        InputStream input=PropertiesTest.class.getClass().getResourceAsStream("/jdbc.properties");
        properties.load(input);
        Enumeration<String> names=(Enumeration<String>) properties.propertyNames();
        while(names.hasMoreElements()){
            //這是key值
            String key=names.nextElement();
            String value=properties.getProperty(key);
            System.out.println(key+"="+value);
        }
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Test
public void name3Test(){
    try{
        Properties properties=new Properties();
        //直接寫(xiě)src 類(lèi)路徑下的文件名
        InputStream input=PropertiesTest.class.getClassLoader().getResourceAsStream("jdbc.properties");
        properties.load(input);
        
        //把key值轉(zhuǎn)換成set 的形式，遍歷set
        Set<String> names=properties.stringPropertyNames();
        Iterator<String> iterator=names.iterator();
        while(iterator.hasNext()){
            String key=iterator.next();
            String value=properties.getProperty(key);
            System.out.println(key+"="+value);
        }
        
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Test
public void name3Test(){
    try{
        Properties properties=new Properties();
        InputStream input=PropertiesTest.class.getClassLoader().getResourceAsStream("jdbc.properties");
        properties.load(input);
        //String value=properties.getProperty("jdbc.url");
        String value=properties.getProperty("jdbc.url1","沒(méi)有該key值");
        System.out.println("輸出值:"+value);
        
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Test
public void writeTest(){
    try{
        Properties properties=new Properties();
        InputStream input=PropertiesTest.class.getClassLoader().getResourceAsStream("jdbc.properties");
        properties.load(input);
        
        //多添加幾個(gè)值。
        properties.setProperty("name","兩個(gè)蝴蝶飛");
        properties.setProperty("sex","男");

        //properties.put("name","兩個(gè)蝴蝶飛");  可以用繼承Hashtable 的put 方法寫(xiě)入值
        // properties.put("sex","男");
        
        //將添加的值，連同以前的值一起寫(xiě)入 新的屬性文件里面。
        OutputStream out=new FileOutputStream("D:\\jdbc.properties");
        properties.store(out,"填充數(shù)據(jù)");
        
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Test
public void write2Test(){
    try{
        Properties properties=new Properties();
        //用絕對(duì)路徑
        InputStream input=new BufferedInputStream(new FileInputStream("D:\\workspace\\JavaLearn\\src\\jdbc.properties"));
        properties.load(new InputStreamReader(input,"utf-8"));
            //多添加幾個(gè)值。
        properties.setProperty("name","兩個(gè)蝴蝶飛");
        properties.setProperty("sex","男");
        
        OutputStream output=new FileOutputStream("D:\\jdbc.properties");
        OutputStreamWriter out=new OutputStreamWriter(output,"utf-8");
        properties.store(out,"填充數(shù)據(jù)");
        
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Test
public void xmlWriteTest(){
    try{
        //處理成編碼樣式。
        Properties properties=new Properties();
        
            //多添加幾個(gè)值。
        properties.setProperty("name","兩個(gè)蝴蝶飛");
        properties.setProperty("sex","男");
        OutputStream output=new FileOutputStream("D:\\jdbc.xml");
        //編碼設(shè)置成utf-8的形式。 
        properties.storeToXML(output,"填充到xml","utf-8");
        
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Test
public void xmlReadTest(){
    try{
        Properties properties=new Properties();
        InputStream input=new BufferedInputStream(new FileInputStream("D:\\jdbc.xml"));
        properties.loadFromXML(input);
        properties.list(System.out);
        
    }catch(Exception e){
        e.printStackTrace();
    }
}