Javaweb internationalization: The use of Dateformat,numberformat,messageformat,resourcebundle _java

Javaweb Internationalization

DateFormat: A tool class that formats dates and is itself an abstract class;

NumberFormat: the character class that formats numbers into numeric strings, or currency strings;

Messageformat: You can format pattern strings, pattern strings: strings with placeholders: "Date: {0}, Salary: {1}", which can be formatted by using the Format method with a pattern string

ResourceBundle: Resource Bundle class, the corresponding resource file is required under the Classpath (SRC): basename.properties. Wherein BaseName is the base name;

File name: test_zh_cn.properties, file is: date=\u65e5\u671f,salary=\u5de5\u8d44

File name: test_en_us.properties, file is: date=date,salary=salary

Import Java.text.DateFormat;
Import Java.text.MessageFormat;
Import Java.text.NumberFormat;
Import java.text.ParseException;
Import Java.text.SimpleDateFormat;
Import Java.util.Date;
Import Java.util.Locale;

Import Java.util.ResourceBundle;

Import Org.junit.Test;
   public class I18ntest {/** * ResourceBundle: Resource Bundle class. * * 1. A corresponding resource file is required under the classpath: Basename.properties.
   Where BaseName is the base name. * 2. You can use the base name _ language code _ Country code. Properties to add resource files for different countries or regions. I18n_zh_cn.properties * 3. 
   Requires that the key for all resource files with the same base name be exactly the same. * 4. You can use the NATIVE2ASCII command to get the ASC code for one of the Chinese characters. Eclipse has a built-in tool * 5. You can call the Getbundle (base name, Locale instance) of ResourceBundle to get the ResourceBundle object * 6. 
   You can call ResourceBundle's getString (key) to get the value of the resource file's values string. * 7. 
   Combined with DateFormat, NumberFormat, Messageformat can achieve internationalization. 
    * */@Test public void Testresourcebundle () {Locale Locale = Locale.china;
  
    ResourceBundle ResourceBundle = resourcebundle.getbundle ("Test", locale); System.out.println (resourcebundle.getstring ("DatE "));
    
    System.out.println (resourcebundle.getstring ("salary"));
    String Datelabel = resourcebundle.getstring ("date");
    
    String Sallabel = resourcebundle.getstring ("salary");
    
    String str = "{0}:{1}, {2}:{3}";
    Date date = new Date ();
    
    Double sal = 12345.12;
    DateFormat DateFormat = dateformat.getdateinstance (dateformat.medium, locale);
    
    String datestr = Dateformat.format (date);
    NumberFormat NumberFormat = numberformat.getcurrencyinstance (locale);
    
    String salstr = Numberformat.format (SAL);
    String result = Messageformat.format (str, Datelabel, DATESTR, Sallabel, SALSTR); 
  SYSTEM.OUT.PRINTLN (result);
   /** * Messageformat: Can format the pattern String * Pattern string: string with placeholder: "Date: {0}, Salary: {1}" * Can be formatted by using the Format method with a pattern string
    
    */@Test public void Testmessageformat () {String str = "Date: {0}, Salary: {1}";
    Locale Locale = Locale.china;
    Date date = new Date ();
    
    Double sal = 12345.12; DateFormat daTeformat = Dateformat.getdateinstance (dateformat.medium, locale);
    
    String datestr = Dateformat.format (date);
    NumberFormat NumberFormat = numberformat.getcurrencyinstance (locale);
    
    String salstr = Numberformat.format (SAL);
    String result = Messageformat.format (str, DATESTR, SALSTR); 
  SYSTEM.OUT.PRINTLN (result); /** * NumberFormat: Format numeric to numeric string, or currency string tool class * 1. Obtain the NumberFormat object * numberformat.getnumberinstance (locale) through the factory method; Strings formatted as numbers * numberformat.getcurrencyinstance (locale); String formatted as Currency * * 2. format by using the Format method of * 3. 
   Resolves a string to a number type by using the Parse method.
    */@Test public void Testnumberformat () throws parseexception{double d = 123456789.123d;
    
    Locale Locale = locale.france;
    
    NumberFormat NumberFormat = numberformat.getnumberinstance (locale);
    String str = Numberformat.format (d); 
    
    System.out.println (str);
  NumberFormat numberFormat2 = numberformat.getcurrencyinstance (locale);  str = Numberformat2.format (d); 
    
    System.out.println (str);
    str = "123 456 789,123";
    D = (Double) numberformat.parse (str); 
    
    System.out.println (d);
    str = "123 456 789,12?";
    D = (Double) numberformat2.parse (str);
    
  System.out.println (d); } * * 7. 
   If you have a string, how do you parse it into a Date object? 
   * I. Create a DateFormat object: Create a DateFormat Subclass SimpleDateFormat Object * SimpleDateFormat (String pattern). * Where pattern is the date, the time format, for example: Yyyy-mm-dd hh:mm:ss * II. 
  Call the DateFormat parse method to resolve the string to the Date object.
    * * @Test public void TestDateFormat2 () throws parseexception{String str = "1990-12-12 12:12:12";
    
    DateFormat DateFormat = new SimpleDateFormat ("Yyyy-mm-dd hh:mm:ss");
    Date date = Dateformat.parse (str); 
  SYSTEM.OUT.PRINTLN (date); 
   /** * DateFormat: A tool class that formats dates. 
   * Dateformate itself is an abstract class. * * 1. If you only want to convert a Date object to a string by DateFormat, you can get the DateFormat object * 2 through the DateFormat factory method. You can get a DateFormat object that formats only Date: GetdateinStance (int style, Locale alocale) * 3. You can get the DateFormat object that only formats time: gettimeinstance (int style, Locale alocale) * 4.  You can get a DateFormat object that formats Date and also formats time: * getdatetimeinstance (int datestyle, int timestyle, Locale alocale) * 5. Where style can take a value of: DateFormat constants: Short, MEDIUM, LONG, full. Locale is the Locale object representing the country area * 6. 
   Format a Date object to a string by using the DateFormat format method.
    
    * * @Test public void Testdateformat () {Locale Locale = locale.us;
    Date date = new Date (); 
    
    SYSTEM.OUT.PRINTLN (date);  Gets the DateFormat object DateFormat dateformat = Dateformat.getdatetimeinstance (Dateformat.long, DateFormat.MEDIUM,
    locale);
    String str = dateformat.format (date); 
    
  System.out.println (str); A class that represents a country or region in the/** * Locale:java.
   Many constants are provided in the JDK. 
   * can also be created by means of Locale (Languagecode, CountryCode), which can be obtained through the Request.getlocale () method in WEB applications.
    * * @Test public void Testlocale () {Locale Locale = Locale.china; System.out.println(Locale.getdisplaycountry ()); 
    
    System.out.println (Locale.getlanguage ());
    locale = new locale ("en", "US");
    System.out.println (Locale.getdisplaycountry ()); 
  System.out.println (Locale.getlanguage ());

 }
  
}

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