Java属性文件操作之Properties与ResourceBundle详解

public class PropertiesRead {
    /**
     * 基于输入流读取属性文件：Properties继承了Hashtable，底层将key/value键值对存储在集合中，
     * 通过put方法可以向集合中添加键值对或者修改key对应的value
     *
     * @throws IOException
     */
    @SuppressWarnings("rawtypes")
    @Test
    public void test01() throws IOException {
        FileInputStream fis = new FileInputStream("src/database.properties");
        Properties props = new Properties();
        props.load(fis);// 将文件的全部内容读取到内存中，输入流到达结尾
        fis.close();// 加载完毕，就不再使用输入流，程序未主动关闭，需要手动关闭

        /*byte[] buf = new byte[1024];
        int length = fis.read(buf);
        System.out.println("content=" + new String(buf, 0, length));//抛出StringIndexOutOfBoundsException*/

        System.out.println("driver=" + props.getProperty("driver"));
        System.out.println("url=" + props.getProperty("url"));
        System.out.println("username=" + props.getProperty("username"));
        System.out.println("password=" + props.getProperty("password"));
        System.out.println("database_name=" + props.getProperty("database_name"));


        /**
         * Properties其他可能用到的方法
         */
        props.put("serverTimezone", "UTC");// 底层通过hashtable.put(key,value)
        props.put("jdbc.password", "456");
        FileOutputStream fos = new FileOutputStream("src/database.xml");// 将Hashtable中的数据写入xml文件中
        props.storeToXML(fos, "来自属性文件的数据库连接四要素");

        System.out.println();
        System.out.println("遍历属性文件");
        System.out.println("hashtable中键值对数目=" + props.size());
        Enumeration keys = props.propertyNames();
        while (keys.hasMoreElements()) {
            String key = (String) keys.nextElement();
            System.out.println(key + "=" + props.getProperty(key));
        }
    }
}

import java.util.ResourceBundle;

public class ResourceBundleAction {
    //用到的常量又和全局相关声明成 static 和 final 类型的.
    public static final String  CLASSDRIVER ;
    public static final String  URL ;
    public static final String  NAME ;
    public static final String  PASSWORD ;
    static{
        /*
        javase中的提供的一个国际化的类 ResourceBundle类。使用这个类可以轻松地本地化或翻译成不同的语言。其中getBundle(String baseName)方法的作用是baseName - 资源包的基本名称，是一个完全限定类名 
                            具有给定基本名称和默认语言环境的资源包 
         */
        CLASSDRIVER = ResourceBundle.getBundle("db").getString("driverClass");
        URL = ResourceBundle.getBundle("db").getString("url");
        NAME = ResourceBundle.getBundle("db").getString("name");
        PASSWORD = ResourceBundle.getBundle("db").getString("password");
    }
} 

    public class TestResourceBundle {
        public static void main(String[] args) {
            Locale locale1 = new Locale("zh", "CN");
            ResourceBundle resb1 = ResourceBundle.getBundle("myres", locale1);
            System.out.println(resb1.getString("aaa"));

            ResourceBundle resb2 = ResourceBundle.getBundle("myres", Locale.getDefault());
            System.out.println(resb1.getString("aaa"));

            Locale locale3 = new Locale("en", "US");
            ResourceBundle resb3 = ResourceBundle.getBundle("myres", locale3);
            System.out.println(resb3.getString("aaa"));
        }
    }

aaa=good 
bbb=thanks

aaa=good 
bbb=thanks

aaa=\u597d 
bbb=\u591a\u8c22

 public class I18nMessages {
        public static final String KEY_NOT_FOUND_PREFIX = "!!!"; //$NON-NLS-1$
        public static final String KEY_NOT_FOUND_SUFFIX = "!!!"; //$NON-NLS-1$
        private static final String BUNDLE_NAME = "messages"; //$NON-NLS-1$
        private static final String BUNDLE_NAME2 = "cn.itcast.interfaceAbstract.messages"; //$NON-NLS-1$
        private static final String PLUGIN_ID = "cn.itcast.resourcebundle"; //$NON-NLS-1$
        private static ResourceBundle resourceBundle = ResourceBundle.getBundle(BUNDLE_NAME2);
        public static String getString(String key, String pluginId, ResourceBundle resourceBundle) {
            if (resourceBundle == null) {
                return KEY_NOT_FOUND_PREFIX + key + KEY_NOT_FOUND_SUFFIX;
            }
            try {
                return resourceBundle.getString(key);
            } catch (MissingResourceException e) {
                return KEY_NOT_FOUND_PREFIX + key + KEY_NOT_FOUND_SUFFIX;
            }
        }
        public static String getString(String key, String pluginId, ResourceBundle resourceBundle, Object... args) {
            return MessageFormat.format(getString(key, pluginId, resourceBundle), args);
        }
        public static String getString(String key, Object... args) {
            return getString(key, PLUGIN_ID, resourceBundle, args);
        }
        public static void main(String[] args) {
            String test = "kxh";
            String test2 = "Yes,I am";
            System.out.println(I18nMessages.getString("name", test, test2));//这个方法设置的可以跟多个参数.
        }
    }