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public class PropertyUtil01 {	private static Properties props = null;	public static void main(String[] args) {		PropertyUtil01 p;		try {			p = new PropertyUtil01();			props = readProperties();			System.out.println(readValue("name"));			System.out.println(readValue("pwd"));			setValue("url", "jdbc:db:xxx");			System.out.println();			System.out.println(p.readAllProperties());		} catch (IOException e) {			e.printStackTrace();		}	}	public Map
   
     readAllProperties()			throws FileNotFoundException, IOException {		// 保存所有的键值		Map
    
      map = new HashMap
     
      ();		Enumeration
       en = props.propertyNames();		while (en.hasMoreElements()) {			String key = (String) en.nextElement();			String Property = props.getProperty(key);			map.put(key, Property);		}		Iterator
      
       
        > mapEntryItr = map.entrySet().iterator();		while (mapEntryItr.hasNext()) {			Map.Entry
        
          maEntry = mapEntryItr.next(); System.out.println(maEntry.getValue()); } return map; } public static String readValue(String key) throws IOException { return props.getProperty(key); } public static void setValue(String key, String value) throws IOException { OutputStream fos = null; try { // e.g. D:\workspace\j2seTest1\bin\properties\config.properties fos = new FileOutputStream(PropertyUtil01.class.getClassLoader() .getResource("properties/").toURI().getPath() + "config.properties"); props.setProperty(key, value); props.store(fos, "comments: last update"); } catch (URISyntaxException e) { e.printStackTrace(); } finally { fos.close(); } } public static Properties readProperties() throws IOException { Properties prop = new Properties(); InputStream fis = null; try { // e.g. D:\workspace\j2seTest1\bin\properties\config.properties fis = new FileInputStream(PropertyUtil01.class.getClassLoader() .getResource("properties/").toURI().getPath() + "config.properties"); prop.load(fis); } catch (URISyntaxException e1) { e1.printStackTrace(); } finally { fis.close(); } return prop; }}
        
       
      
     
    
   

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