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

DateFormat: A tool class that formats a date, itself an abstract class;

NumberFormat: A character class that formats numeric to numeric strings, or currency strings;

Messageformat: Can format pattern string, pattern string: string with placeholder: "Date: {0}, Salary: {1}", can be formatted using the Format method of the pattern string

ResourceBundle: Resource bundle class, requires a corresponding resource file under the Classpath (SRC): basename.properties. Where BaseName is the base name;

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

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

ImportJava.text.DateFormat;ImportJava.text.MessageFormat;ImportJava.text.NumberFormat;Importjava.text.ParseException;ImportJava.text.SimpleDateFormat;Importjava.util.Date;ImportJava.util.Locale;ImportJava.util.ResourceBundle;Importorg.junit.Test; Public classI18ntest {/*** 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.      The key for all resource files that require the same base name must be exactly the same. * 4. You can use the NATIVE2ASCII command to get an ASC code for a Chinese character pair. Eclipse built-in tool * 5. You can call ResourceBundle's Getbundle (base name, Locale instance) to get the ResourceBundle object * 6.      You can call ResourceBundle's getString (key) to get the value of the value string for the resource file. * 7.      Combined with DateFormat, NumberFormat, Messageformat can achieve internationalization. *      */@Test Public voidTestresourcebundle () {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=NewDate (); DoubleSal = 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 pattern String * Pattern string: string with placeholder: "Date: {0}, Salary: {1}" * Can be formatted using the Format method of the pattern string. /c1>*/@Test Public voidTestmessageformat () {String str= "Date: {0}, Salary: {1}"; Locale Locale=Locale.china; Date Date=NewDate (); DoubleSal = 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: Formatting numbers to numeric strings, or tool classes for currency strings * 1. Get the NumberFormat object by factory method * Numberformat.getnumberinstance (LO Cale); A string formatted as a number * numberformat.getcurrencyinstance (locale); The format is the currency of the string * * 2. Formatted with the Format method * 3.      Parses a string into a number type by using the Parse method. */@Test Public voidTestnumberformat ()throwsparseexception{DoubleD = 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 there is a string, how to parse it into a Date object?      * I. Create DateFormat object: Create DateFormat Subclass SimpleDateFormat Object * SimpleDateFormat (String pattern). * Where pattern is a date, the format of time, for example: Yyyy-mm-dd HH:MM:SS * ii.      Call DateFormat's Parse method to parse the string into the Date object. */@Test Public voidTESTDATEFORMAT2 ()throwsparseexception{String str= "1990-12-12 12:12:12"; DateFormat DateFormat=NewSimpleDateFormat ("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 DateFormat Object * 2 through DateFormat's factory method. You can get a DateFormat object that only formats 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 DateFormat objects that both format Date and format time: * getdatetimeinstance (int datestyle, int timestyle, Locale alocale) * 5. Where style can be evaluated as: DATEFORMAT constant: Short, MEDIUM, LONG, full. Locale is the locale object representing the national region * 6.      Formats a Date object into a string by using the format method of DateFormat. */@Test Public voidTestdateformat () {locale locale=locale.us; Date Date=NewDate ();                 SYSTEM.OUT.PRINTLN (date); //get DateFormat ObjectDateFormat DateFormat =dateformat.getdatetimeinstance (Dateformat.long, Dateformat.medium, locale); String Str=Dateformat.format (date);             System.out.println (str); }    /*** Locale:java represents the country or region of the class.     Many constants are available in the JDK.      * can also be created through the Locale (Languagecode, CountryCode) method can be obtained through the Request.getlocale () way in the WEB application. */@Test Public voidTestlocale () {locale locale=Locale.china;        System.out.println (Locale.getdisplaycountry ());                 System.out.println (Locale.getlanguage ()); Locale=NewLocale ("en", "US");        System.out.println (Locale.getdisplaycountry ());     System.out.println (Locale.getlanguage ()); }    }

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