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1. 使用java.util.Properties类的load()方法（注意点：jdbc.properties这个文件若以此种方式加载，必须要放在类路径下，不然将无法进行加载）
InputStream inputStream = new BufferedInputStream(new FileInputStream(new File("jdbc.properties")));
Properties properties =new Properties();
properties.load(inputStream);
System.out.println(properties.get("jdbc.url"));
2. 使用java.util.ResourceBundle类的getBundle()方法（注意点：文件的写入并没有文件的后缀名）
ResourceBundle rb = ResourceBundle.getBundle("jdbc",Locale.getDefault());
Enumeration<String> keys = rb.getKeys();
while (keys.hasMoreElements()) {
String key = (String) keys.nextElement();
System.out.println(rb.getString(key));
}
3. 使用java.util.PropertyResourceBundle类的构造函数
InputStream inputStream = new BufferedInputStream(new FileInputStream("src/jdbc.properties"));
ResourceBundle bundle =new PropertyResourceBundle(inputStream);
System.out.println(bundle.getString("jdbc.url"));
InputStream inputStream = ClassLoader.getSystemResourceAsStream("jdbc.properties");
Properties properties =new Properties();
properties.load(inputStream);
System.out.println(properties.get("jdbc.url"));
InputStream inputStream = JDBCProperties.class.getClassLoader().getResourceAsStream("jdbc.properties");
Properties properties =new Properties();
properties.load(inputStream);
System.out.println(properties.get("jdbc.url"));
6. 使用java.lang.ClassLoader类的getSystemResourceAsStream()静态方法
InputStream inputStream = JDBCProperties.class.getResourceAsStream("/jdbc.properties");
Properties properties =new Properties();
properties.load(inputStream);
System.out.println(properties.get("jdbc.url"));
7. Servlet中可以使用javax.servlet.ServletContext的getResourceAsStream()方法
InputStream in = context.getResourceAsStream(path);
Properties p = new Properties();
p.load(in);
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原文地址：http://www.cnblogs.com/yu0312chao/p/4925144.html
