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学习Eclipse NLS

今天研究了1下Eclipse的NLS,觉得不错,与大家分享....
messages.properties
key_1=hello world,here is NLS
key_2=hello {0}, welcome to my blog
key_3=hello {0}, please reply to{1} if you like this article
其中的 {0} 代表MessageHelper.bind(MessageHelper.key_2, "gembin"); 里的第1个参数,一次类推
public class MessageHelper extends NLS {
   //com.exmple.messages 中的点将会被转换成"/"
  // 所以最终的路径为:com/exmple/messages.properties
    private static final String BUNDLE_NAME = "com.exmple.messages"; //$NON-NLS-1$
    public static String key_1;
    public static String key_2;
    static{
        initializeMessages(BUNDLE_NAME, MessageHelper.class);
        
    }
 
    /**
     * Bind the given message's substitution locations with the given string value.
     *
     * @param message
     *            the message to be manipulated
     * @param binding
     *            the object to be inserted into the message
     * @return the manipulated String
     */
    public static String bind(String message, Object binding) {
        return NLS.bind(message, binding);
    }

    /**
     * Bind the given message's substitution locations with the given string values.
     *
     * @param message
     *            the message to be manipulated
     * @param binding1
     *            An object to be inserted into the message
     * @param binding2
     *            A second object to be inserted into the message
     * @return
     */
    public static String bind(String message, Object binding1, Object binding2) {
        return NLS.bind(message, binding1, binding2);
    }

    /**
     * Bind the given message's substitution locations with the given string values.
     *
     * @param message
     *            the message to be manipulated bindings
     * @param bindings
     *            An array of objects to be inserted into the message
     * @return the manipulated String
     */
    public static String bind(String message, Object[] bindings) {
        return NLS.bind(message, bindings);
    }

    /**
     * Initialize the given class with the values from the specified message bundle.
     *
     * @param bundleName -
     *            fully qualified path of the class name
     * @param clazz -
     *            the class where the constants will exist
     */
    @SuppressWarnings("unchecked")
    public static void initializeMessages(String bundleName, Class clazz) {
        NLS.initializeMessages(BUNDLE_NAME, MessageHelper.class);
    }
    
    public static void main(String sp[]){
  
          String s=MessageHelper.bind(MessageHelper.key_2, "hello");
          System.out.println(s);
    }

}

posted on 2008-01-23 18:50 gembin 阅读(3409) 评论(4)  编辑  收藏

评论

# re: 学习Eclipse NLS 2008-01-24 20:35 guest

什么是nls  回复  更多评论   

# re: 学习Eclipse NLS 2008-01-26 15:31 gembin

Eclipse SRC里的: No need Localized String 1
可代替ResourceBundle,用来处理资源文件*.properties,效率更好,更方便,很好的扩展性。
当有Key没定义,会get a compile error.
缺点是:必须维护2个文件1个Properties和1个Java文件,他们必须同步  回复  更多评论   

# re: 学习Eclipse NLS 2008-03-04 21:52 jolly

请问绑定的类只能是当前类吗?而且不能用内部类作为绑定类?  回复  更多评论   

# re: 学习Eclipse NLS 2008-03-05 11:57 gembin

是可以的。请看如下例子:
message.properties
------------------
key_1=Say {0} hello to {1} !!
key_2=Say {0} hello to {1} !!
key3=Say {0} hello to {1} !!
key4=Say {0} hello to {1} !!

TobeBindedMsg.java
---------------------
public class TobeBindedMsg {
public static String key3;

static class InnerMsg{
public static String key4;
}
}

TestNLS.java
------------------
import org.eclipse.osgi.util.NLS;
public class TestNLS {
private static final String BUNDLE_NAME = "com.meccala.blog.util.message"; //$NON-NLS-1$
public static String key_2;
static {
NLS.initializeMessages(BUNDLE_NAME, TestNLS.class);
NLS.initializeMessages(BUNDLE_NAME, Inner.class);
NLS.initializeMessages(BUNDLE_NAME, TobeBindedMsg.class);
NLS.initializeMessages(BUNDLE_NAME, TobeBindedMsg.InnerMsg.class);
}

static class Inner {
public static String key_1;
}

public static void main(String ggg[]) {
String s = NLS.bind(Inner.key_1, "1", "gembin");
System.out.println(s);
String s1 = NLS.bind(TestNLS.key_2, "2", "gembin");
System.out.println(s1);
String s2 = NLS.bind(TobeBindedMsg.key3, "3", "gembin");
System.out.println(s2);
String s3 = NLS.bind(TobeBindedMsg.InnerMsg.key4, "4", "gembin");
System.out.println(s3);
}
}



最后的输出:
Say 1 hello to gembin !!
Say 2 hello to gembin !!
Say 3 hello to gembin !!
Say 4 hello to gembin !!
NOTE:因为Key要求是public static 的所以Inner Class必需是static   回复  更多评论   


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