Multi currency support with java.util.Locale
My project has a requirement to support multiple currencies as our first internationalization feature. However, I've come across something with the Locale class that doesn't really make sense to me, and I'm wondering if anyone else has any best practices or insight.
Why can't you create a Locale knowing only the ISO 3166 code? For multi-currency support, it doesn't make sense that I should need to provide a language in order to obtain a Locale, which is needed to generate the proper NumberFormat (and in 1.4 the java.util.Currency) class.
Is there an instance where the language one speaks is directly correlated to the currency that they use?
Actually, it doesn't make much sense that you can create a Locale only from a language either, since if my user a Hispanic-American, the language would be Spanish but the country (and therefore currency) would be US.
It seems to me that if the Locale class can default a country code based on the language, it should also be able to default a language based on the country.
Given these limitations, is there a recommended best practice about obtaining a Locale without a pre-determined language?
Hi,
this was a bit of a bugbear for a long time. Currency kind of wound up inexorably linked to Locale for a long time because the way a currency was formatted depended on the textual layout of the language as well as the country, and as date formatting was an issue too, it was easier for them to implement it the way they did.
It's been an RFE for a long time, and I believe the beta releases of Merlin carry a currency API that is separate from a Locale. The link to the RFE is below. Hopefully Merlin Beta will allow you to achieve what you want - it seems to be pretty stable from what I've seen of it, and Sun do have a good record when it comes to releasing stable betas, so I wouldn't panic too much about the fact you're developing on a "pre-release candidate" JDK.
http://developer.java.sun.com/developer/bugParade/bugs/4290801.html
Hope that helps!
Martin Hughes
Similar Messages
-
Formatting Negative Currency using the Java.Util Locale
Hi....
I am using the Locale file to get the currency code of a specified country. The code is given below.
public String setCurrency(String _currency){
Locale locale = new Locale("","PG");
NumberFormat format = NumberFormat.getCurrencyInstance(locale);
this.currency = format.format(Double.parseDouble(_currency));
return currency;
When i pass a negative value as the currency (-200) the string which returns will be as (PGK200) and when i pass a positive value it will be as PGK200......
How can i format this so that when i pass a negative value, the returned String will be -PGK200 ??
If there is anyone who knows how i can get this done please reply soon....
Thanks in advance.
Regards
Nuwan.Check this out:import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
public class CurrencyEg {
private String currency;
public String setCurrency(String _currency){
Locale locale = new Locale("","PG");
//NumberFormat format = NumberFormat.getCurrencyInstance(locale);
DecimalFormat format = (DecimalFormat)NumberFormat.getCurrencyInstance(locale);
format.setNegativePrefix("-PKG");
format.setNegativeSuffix("");
format.setPositivePrefix("PKG");
format.setPositiveSuffix("");
format.setMaximumFractionDigits(0);
this.currency = format.format(Double.parseDouble(_currency));
return currency;
public static void main(String args[]) {
CurrencyEg eg = new CurrencyEg();
System.out.println("200 -> " + eg.setCurrency("200"));
System.out.println("-200 -> " + eg.setCurrency("-200"));
}I don't know how valid it is to cast and mess about with the format - but it gives exactly the output you were after:200 -> PKG200
-200 -> -PKG200 -
Can not create WebService with java.util.Locale object why?
I am unable to create a WebService which contains a Locale Object in the request. I assume its because the java.util.Locale object is not Serializable. Can anyone tell me if there is a work around for this?
Hi,
Make sure your strings for Locale follow these rules...
The language string should be lower-case, two-letter codes as defined by ISO-639.
http://www.ics.uci.edu/pub/ietf/http/related/iso639.txt
The country string should be upper-case, two-letter codes as defined by ISO-3166.
http://www.chemie.fu-berlin.de/diverse/doc/ISO_3166.html
Or try with some constant Locales like
Locale.CANADA
Locale.US
regards,
Uma -
Java.util.Locale not thread-safe !
In multithreading programming, we know that double-checking idiom is broken. But lots of code, even in sun java core libraries, are written using this idiom, like the class "java.util.Locale".
I have submitted this bug report just now,
but I wanted to have your opinion about this.
Don't you think a complete review of the source code of the core libraries is necessary ?
java.util.Locale seems not to be thread safe, as I look at the source code.
The static method getDefault() is not synchronized.
The code is as follows:
public static Locale getDefault() {
// do not synchronize this method - see 4071298
// it's OK if more than one default locale happens to be created
if (defaultLocale == null) {
// ... do something ...
defaultLocale = new Locale(language, country, variant);
return defaultLocale;
This method seems to have been synchronized in the past, but the bug report 4071298 removed the "synchronized" modifier.
The problem is that for multiprocessor machines, each processor having its own cache, the data in these caches are never synchronized with the main memory.
The lack of a memory barrier, that is provided normally by the "synchronized" modifier, can make a thread read an incompletely initialized Locale instance referenced by the static private variable "defaultlocale".
This problem is well explained in http://www.javaworld.com/javaworld/jw-02-2001/jw-0209-double.html and other documents about multithreading.
I think this method must just be synchronized again.Shankar, I understand that this is something books and articles about multithreading don't talk much about, because for marketing reasons, multithreading is supposed to be very simple.
It absolutely not the case.
Multithreading IS a most difficult topic.
First, you must be aware that each processor has its own high-speed cache memory, much faster than the main memory.
This cache is made of a mixture of registers and L1/L2/L3 caches.
Suppose we have a program with a shared variable "public static int a = 0;".
On a multiprocessor system, suppose that a thread TA running on processor P1 assign a value to this variable "a=33;".
The write is done to the cache of P1, but not in the main memory.
Now, a second thread TB running on processor P2 reads this variable with "System.out.prinln(a);".
The value of "a" is retrieved from main memory, and is 0 !
The value 33 is in the cache of P1, not in main memory where its value is still 0, because the cache of P1 has not been flushed.
When you are using BufferedOutputStream, you use the "flush()" method to flush the buffer, and the "synch()" method to commit data to disk.
With memory, it is the same thing.
The java "synchronized" keyword is not only a streetlight to regulate traffic, it is also a "memory barrier".
The opening brace "{" of a synchronized block writes the data of the processor cache into the main memory.
Then, the cache is emptied, so that stale values of other data don't remain here.
Inside the "synchronized" block, the thread must thus retrieve fresh values from main memory.
At the closing brace "}", data in the processor cache is written to main memory.
The word "synchronized" has the same meaning as the "sync()" method of FileDescriptor class, which writes data physically to disk.
You see, it is really a cache communication problem, and the synchronized blocks allows us to devise a kind of data transfer protocol between main memory and the multiple processor local caches.
The hardware does not do this memory reconciliation for you. You must do it yourself using "synchronized" block.
Besides, inside a synchronized block, the processor ( or compiler ) feels free to write data in any order it feels most appropriate.
It can thus reorder assignments and instruction.
It is like the elevator algorithm used when you store data into a hard disk.
Writes are reordered so that they can be retrieved more efficiently by one sweep or the magnetic head.
This reordering, as well as the arbitrary moment the processor decides to reconciliate parts of its cache to main memory ( if you don't use synchronized ) are the source of the problem.
A thread TB on processor P2 can retrieve a non-null pointer, and retrieve this object from main memory, where it is not yet initialized.
It has been initialized in the cache of P1 by TA, though, but TB doen't see it.
To summarize, use "synchronized" every time you access to shared variables.
There is no other way to be safe.
You get the problem, now ?
( Note that this problem has strictly nothing to do with the atomicity issue, but most people tend to mix the two topics...
Besides, as each access to a shared variable must be done inside a synchronized block, the issue of atomicity is not important at all.
Why would you care about atomicity if you can get a stale value ?
The only case where atomicity is important is when multiple threads access a single shared variable not in synchronized block. In this case, the variable must be declared volatile, which in theory synchronizes main and cache memory, and make even long and double atomic, but as it is broken in lots of implementation, ... ) -
WS endpoints restricition: What about java.util.Locale etc.?
We have some problems with the restrictions for WS endpoints.
Using SAPNW Developer Studio to create a web service including the virtual interface from a stateful session bean, we are not allowed to use usual types like java.util.Locale or java.util.Properties although they are serializable.
This is also decribed in the SAPNW DS Help:
"The following types are not allowed anywhere in the endpoint of a Web service:
· Remote objects (EJBs)
· Classes extending into another class and implementing an interface
· Hashed table-like types
· Classes/objects that cannot be serialized"
So what is the preferred solution for this issue?
Is there a way to use the serializable java.util.Locale type in a WS endpoint, or do we have to use its String representation?
What is the preferred solution for hash-table types like Properties? And what about Interface types like Map?
Maybe we just do not find the decisive documentation link?
Thanks a lot,
Dirk
Edited by: Dirk Weigand on Nov 20, 2008 8:48 AM
Moved to "Application Server - Java Programming"Question moved to "Java Programming"
-
Can't create log file with java.util.logging
Hi,
I have created a class to create a log file with java.util.logging
This class works correctly as standalone (without jdev/weblogic)
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.*;
public class LogDemo
private static final Logger logger = Logger.getLogger( "Logging" );
public static void main( String[] args ) throws IOException
Date date = new Date();
DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
String dateStr = dateFormat.format(date);
String logFileName = dateStr + "SEC" + ".log";
Handler fh;
try
fh = new FileHandler(logFileName);
//fh.setFormatter(new XMLFormatter());
fh.setFormatter(new SimpleFormatter());
logger.addHandler(fh);
logger.setLevel(Level.ALL);
logger.log(Level.INFO, "Initialization log");
// force a bug
((Object)null).toString();
catch (IOException e)
logger.log( Level.WARNING, e.getMessage(), e );
catch (Exception e)
logger.log( Level.WARNING, "Exception", e);
}But when I use this class...
import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.FileHandler;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.XMLFormatter;
public class TraceUtils
public static Logger logger = Logger.getLogger("log");
public static void initLogger(String ApplicationName) {
Date date = new Date();
DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
String dateStr = dateFormat.format(date);
String logFileName = dateStr + ApplicationName + ".log";
Handler fh;
try
fh = new FileHandler(logFileName);
fh.setFormatter(new XMLFormatter());
logger.addHandler(fh);
logger.setLevel(Level.ALL);
logger.log(Level.INFO, "Initialization log");
catch (IOException e)
System.out.println(e.getMessage());
}and I call it in a backingBean, I have the message in console but the log file is not created.
TraceUtils.initLogger("SEC");why?
Thanks for your help.I have uncommented this line in logging.properties and it works.
# To also add the FileHandler, use the following line instead.
handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandlerBut I have another problem:
jdev ignore the parameters of the FileHandler method .
And it creates a general log file with anothers log files created each time I call the method logp.
So I play with these parameters
fh = new FileHandler(logFileName,true);
fh = new FileHandler(logFileName,0,1,true);
fh = new FileHandler(logFileName,10000000,1,true);without succes.
I want only one log file, how to do that? -
Problem:
I wanna generate random number in interval <0;1> with two "decimal number precision" (i dont know, how to expres it exactly in English.. So, here is Patern: "*X.XX*" (For ex. it might be numbers like 0.24 , 1.00 , 0.05, 0.54) ).
I have tried to work with java.util.Random class, but i dont understood it at all, because i'm not good in Math-English terms.
So, how can I do it? I offer duke stars for any solve. Thanks.First of all, read this link to understand why all floating point numbers (float, double) can't be rounded to two places of decimals.
[What Every Computer Scientist Should Know About Floating-Point Arithmetic|http://docs.sun.com/source/806-3568/ncg_goldberg.html]
Consider changing your program to use integer numbers in the range of [0..100] instead. You can generate a random number in this range byRandom random = new Random();
int randomInt = random.nextInt(101);If your problem can't be solved with this approach, you may need to tell us exactly how you plan to further process the random number.
luck, db -
Multi-currency site with offline processing
Is it possible to have a Multi-currency site with offline credit card processing? The offline credit card facility would be in Australia, so all transactions would be in Australian dollars, but the site would display either AUD or USD, depending on the user's selection.
To display prices in different currencies you will need to setup different domains or subdomains for each currency as per this article http://kb.worldsecuresystems.com/521/bc_521.html
Cheers,
-mario -
How do I compress a string with java.util.zip - not a file ?
How do I compress a string with java.util.zip?
Is possible to compress something else except a file?Of course, compression works on bytes, not some higher level constructs like Strings or files.
You can use the ZipOutputStream or DeflaterOutputStream for compression.
And the javadoc for Deflater even has a code example of compressing a String.
Edited by: Kayaman on May 22, 2011 5:04 PM -
Multi-locale support in java.util.logging?
Can I use log (or logrb) methods in the java.util.logging API to localize my messages to a locale other than the default locale? From what I see in the jdk doc & src, it seems like this is not possible. This kind of multi-locale localization support is essential for server applications that talk to clients from different locales.
Well, I've never done localization. In case you haven't seen it, here's some documentation from Logger, but that's all I can offer.
Each Logger may have a ResourceBundle name associated with it. The named bundle will be used for localizing logging messages. If a Logger does not have its own ResourceBundle name, then it will inherit the ResourceBundle name from its parent, recursively up the tree.
Most of the logger output methods take a "msg" argument. This msg argument may be either a raw value or a localization key. During formatting, if the logger has (or inherits) a localization ResourceBundle and if the ResourceBundle has a mapping for the msg string, then the msg string is replaced by the localized value. Otherwise the original msg string is used. Typically, formatters use java.text.MessageFormat style formatting to format parameters, so for example a format string "{0} {1}" would format two parameters as strings.
When mapping ResourceBundle names to ResourceBundles, the Logger will first try to use the Thread's ContextClassLoader. If that is null it will try the SystemClassLoader instead. As a temporary transition feature in the initial implementation, if the Logger is unable to locate a ResourceBundle from the ContextClassLoader or SystemClassLoader the Logger will also search up the class stack and use successive calling ClassLoaders to try to locate a ResourceBundle. (This call stack search is to allow containers to transition to using ContextClassLoaders and is likely to be removed in future versions.)
Formatting (including localization) is the responsibility of the output Handler, which will typically call a Formatter. -
What's wrong with java.util.Date type?
Hi!
When I try to persist object having field of type java.util.Date I get the
following SQL logged by Kodo with subsequent transaction rollback:
2002-11-14 15:03:35,099 INFO
[com.solarmetric.kodo.impl.jdbc.ee.ManagedConnecti
onFactoryImpl.supportcrm/kodo] INSERT INTO BILLY.TT_COMMENTS(COMMENT_TYPE,
TEXT,
CREATED_BY, ID, SUBJECT, CREATE_DATE, TT_MAIN_ID) VALUES (1, '1', 10, 279,
'1',
{ts '2002-11-14 15:03:35.059'}, 147)
When I change "{ts '2002-11-14 15:03:35.059'}" with "TO_DATE('2002-11-14
15:03', 'YYYY-DD-MM HH24:MI')" in SQL editor
and execute it everything works fine.
What does "{ts '..'}" mean? Is it a SQL generation error?
Thank you in advance.
Best regards,
Alexey MaslovI've created my own dictionary with dateToSQL() method overridden.
Now it works fine. But it's a kind of strange. Oracle is used often and my
JDBC drivers
are the most recent (at least, from the oracle.com).
Anyway, thank you again.
"Alexey Maslov" <[email protected]> wrote in message
news:[email protected]...
Patric,
Thank you for response.
We're using Oracle 8.1.7 via OCI driver from Oracle 9.2.
I've already tried 2.4.0 and it works fine there but I've found another
problem there
preventing me from using it. See my post in solarmetric.kodo.betanewsgroup.
>
"Patrick Linskey" <[email protected]> wrote in message
news:[email protected]...
That's odd -- what version of Oracle are you using?
Moving to Kodo JDO 2.4.0
(http://www.solarmetric.com/Software/beta/2.4.0) will almost certainly
get rid of this problem, as we use exclusively prepared statements in
it, and therefore pass dates etc. to JDBC as parameters.
But, to get things working with your Oracle database and Kodo JDO 2.3,
you could create your own extension of OracleDictionary and override the
dateToSQL() method to generate the appropriate TO_DATE() syntax. See our
documentation for more details on creating custom database dictionaries.
-Patrick
Alexey Maslov wrote:
I've added TRACE level logging for transactions in JBoss and got
original
exception:
NestedThrowables:
com.solarmetric.kodo.impl.jdbc.sql.SQLExceptionWrapper: [SQL=INSERT
INTO
BILLY.T
T_MAIN(TT_SOLUTION_ID, DELAY_REASON, TT_STATE_ID, ID, CONTACT_PHONE,
CANCEL_REAS
ON, OPER_DESCR, TT_TYPE_ID, CREATED_BY, EXP_CLOSE_DATE,SERV_OPEN_DATE,
OPEN_DAT
E, FLAGS, TAKEN_BY, TT_CAT_ID, SUBJECT_ID, SUBJECT, SERV_CLOSE_DATE)
VALUES
(NUL
L, NULL, 1, 439, NULL, NULL, '____________ ________________ ________________', 7, 5, {ts
'2002-11-14 1
8:38:16.075'}, NULL, {ts '2002-11-14 18:18:16.075'}, 0, NULL, 11,24099,
'1', NU
LL)] ORA-00904: invalid column name
at
com.solarmetric.kodo.impl.jdbc.runtime.SQLExceptions.throwFatal(SQLEx
ceptions.java:17)
at
com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.insert(JDBCSt
oreManager.java:421)
at
com.solarmetric.kodo.runtime.datacache.DataCacheStoreManager.insert(D
ataCacheStoreManager.java:265)
at
com.solarmetric.kodo.runtime.StateManagerImpl.insert(StateManagerImpl
..java:1783)
atcom.solarmetric.kodo.runtime.PNewState.flush(PNewState.java:31)
at
com.solarmetric.kodo.runtime.StateManagerImpl.flush(StateManagerImpl.
java:372)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(Persistence
ManagerImpl.java:426)
at
com.solarmetric.kodo.ee.EEPersistenceManager.beforeCompletion(EEPersi
But when I try to execute the statement above against the database
manually
everything works fine.
I'm absolutely desperate!
P.S. On 2.4.0 RC the operation invoking this database insert completes
fine.
"Alexey Maslov" wrote in message
news:[email protected]...
Hi!
When I try to persist object having field of type java.util.Date I
get
the
following SQL logged by Kodo with subsequent transaction rollback:
2002-11-14 15:03:35,099 INFO
[com.solarmetric.kodo.impl.jdbc.ee.ManagedConnecti
onFactoryImpl.supportcrm/kodo] INSERT INTOBILLY.TT_COMMENTS(COMMENT_TYPE,
TEXT,
CREATED_BY, ID, SUBJECT, CREATE_DATE, TT_MAIN_ID) VALUES (1, '1',
10,
>>>
279,
'1',
{ts '2002-11-14 15:03:35.059'}, 147)
When I change "{ts '2002-11-14 15:03:35.059'}" with
"TO_DATE('2002-11-14
15:03', 'YYYY-DD-MM HH24:MI')" in SQL editor
and execute it everything works fine.
What does "{ts '..'}" mean? Is it a SQL generation error?
Thank you in advance.
Best regards,
Alexey Maslov
Patrick Linskey [email protected]
SolarMetric Inc. http://www.solarmetric.com
Best regards,
Alexey Maslov -
What's wrong with java.util.Date??
Hi all,
I was just practicing a bit of java.util ,when i was compiling my code-
import java.util.Date;
import java.text.SimpleDateFormat;
class DateStamp{
public static void Main(String args[]){
doDate1;
String D;
int D1,D2,D3;
Date dt=new Date();
SimpleDateFormat sdf=new SimpleDateFormat("dd-mm-yyyy");
/*When using method .setDate(x) ,is x an integer or String?can x=2/5/2002 or 2-5-2002?*/
public void doDate1{
dt.setDay(12);
dt.setMonth(12);
dt.setYear(102);
D=dt.getTime();
D.parseInt(D1);D=""
D=sdf.getTime();
D.parseInt(D2);
int D3=D2-D1;
int D3=D3/86400000;/*How do you convert milisec-to-days?*/
D=D3.toString().
System.out.println(D+"days have elapsed since then");
the compiler said this-
File Compiled...
--------------------------- Javac Output ---------------------------
DateStamp.java:7: Invalid expression statement.doDate1;^DateStamp.java:14: Instance variables can't be void: doDate1public void doDate1; ^2 errors
this problem is persistant, and i'm a java newbie ,Does anyone know what's wrong here?
Thanks!
Regards,
aesh83How do you get System date onto a Date variable?Calendar.getInstance().getTime() returns a java.util.Date for the current time. You can also use System.currentTimeMillis() and turn it into a Date.
Will date.after(Date when) method work when Date
variables are in milisecs?Date.after(Date when) compares two date objects. As the JavaDoc says "Returns:
true if and only if the instant represented by this Date object is strictly later than the instant represented by when" To me that says that milliseconds are taken into account, I.E. comparing dates actually compares the date plus the time portion.
>
What methods-
*Convert a date(dd/mm/yy) to milisec?If you look in the javaDoc you'll see "long getTime() Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object." Calendar also has the getTimeInMillis() method.
*Convert a milisec value to a date(dd/mm/yy)?Calendar.setTimeInMillis(long);
I'm have this little problem.
When using GregorianCalander-
*need to initialize?
*need set today's date?Calendar.getInstance() will return an appropriate Calendar object for the current locale initialized to the current date/time.
*how do you check if a date exceeds 3 weeks?I'm not sure what you mean. There are a couple of roll(...) methods that will allow you to add a unit of time to a date. I.E. you could add three weeks to a date.
To ignore the time portion of a date just set the time to "00:00"
Col -
Who use sql-mapping with java.util.regex?
Hi everyone:
I use the IBatis SQL-Mapping and I think it is very good.Now I want to add the search function to my BBS forum.I also want to display the content high light like jive.I mean that if I want to find the string "ibatis",then the search result "ibatis" will be high light displayed.
So I must use the java.util.regex in jsdk1.4.But the problem is that what I get is a List if I use sql-mapping.For example:
String resource="conf/XML/sql/lyo-sql-map.xml";
Reader reader=Resources.getResourceAsReader(resource);
sqlmap=XmlSqlMapBuilder.buildSqlMap(reader);
List articlelist=sqlmap.executeQueryForList("selectSiteArticle","%"+icontent+"%");
The result I get is a List and I have no time to use regex.
I don't know whether I could do this:
Iterate the List,use the regex and later place all the object back to the List.
It's right?
How to use regex with sql-mapping?ThksAny idea? :(
-
Getting error by ValueBinding with java.util.Date
Hi.
1. my english is not so good.
I develop a JSF-application to learn more about JSF-technologie.
I use Eclipse 3.2
Plugins: Web Tools Platform (WTP), Web Standard Tools, Java Server Faces // Version 1.5.0
JRE: 1.5
java-impl.jar and java-api.jar (sun)
Look at this JSP-File Code
<h:inputText id="dbirth" value="#{dataBean.dbrith}"> </h:inputText>
this produce an error: EL expression does not evaluate to expected types for this attribute
dataBean is a ManagedBeain. So if I use any athor variable from this Bean like:
<h:inputText id="sname" value="#{dataBean.sname}"> </h:inputText>
is going well. But if I use any java.util.Date variable it produce the error.
I tried with other Bean and the error is still there.
I can compile and use this JSP, but this error is there.
Have any one an idea what is happen there??
I looked at Eclipse forums, but I didnt found description for an error like this..
thanks for any help...
naba
Message was edited by:
NamboTangoThe problem is because you have bound the inputText to a java.util.Date object, instead of a String. You must use Strings with inputText. However, JSF has provided a way for you to convert objects into a String. It just needs to know how to do that. Luckily for you, there is a converter already available to convert a Date object into a String. Converters will also take input Strings and convert them into an object.
So, in your case, use the convertDateTime tag. Like this:
<h:inputText id="dbirth" value=#{dataBean.dbrith}">
<f:convertDateTime type="date" pattern="MMM dd, yyyy" />
</h:outputText>Try it. You may change the pattern to whichever valid one you like.
CowKing -
Cannot extract Zip file with Winzip after zipping with java.util.zip
Hi all,
I write a class for zip and unzip the text files together which can be zip and unzip successfully with Java platform. However, I cannot extract the zip file with Winzip or even WinRAR after zipping with Java platform.
Please help to comment, thanks~
Below is the code:
=====================================================================
package myapp.util;
import java.io.* ;
import java.util.TreeMap ;
import java.util.zip.* ;
import myapp.exception.UserException ;
public class CompressionUtil {
public CompressionUtil() {
super() ;
public void createZip(String zipName, String fileName)
throws ZipException, FileNotFoundException, IOException, UserException {
FileOutputStream fos = null ;
BufferedOutputStream bos = null ;
ZipOutputStream zos = null ;
File file = null ;
try {
file = new File(zipName) ; //new zip file
if (file.isDirectory()) //check if it is a directory
throw new UserException("Invalid zip file ["+zipName+"]") ;
if (file.exists() && !file.canWrite()) //check if it is readonly
throw new UserException("Zip file is ReadOnly ["+zipName+"]") ;
if (file.exists()) //overwrite the existing file
file.delete();
file.createNewFile();
//instantiate the ZipOutputStream
fos = new FileOutputStream(file) ;
bos = new BufferedOutputStream(fos) ;
zos = new ZipOutputStream(bos) ;
this.writeZipFileEntry(zos, fileName); //call to write the file into the zip
zos.finish() ;
catch (ZipException ze) {
throw ze ;
catch (FileNotFoundException fnfe) {
throw fnfe ;
catch (IOException ioe) {
throw ioe ;
catch (UserException ue) {
throw ue ;
finally {
//close all the stream and file
if (fos != null)
fos.close() ;
if (bos != null)
bos.close();
if (zos != null)
zos.close();
if (file != null)
file = null ;
}//end of try-catch-finally
private void writeZipFileEntry(ZipOutputStream zos, String fileName)
throws ZipException, FileNotFoundException, IOException, UserException {
BufferedInputStream bis = null ;
File file = null ;
ZipEntry zentry = null ;
byte[] bArray = null ;
try {
file = new File(fileName) ; //instantiate the file
if (!file.exists()) //check if the file is not exist
throw new UserException("No such file ["+fileName+"]") ;
if (file.isDirectory()) //check if the file is a directory
throw new UserException("Invalid file ["+fileName+"]") ;
//instantiate the BufferedInputStream
bis = new BufferedInputStream(new FileInputStream(file)) ;
//Get the content of the file and put into the byte[]
int size = (int) file.length();
if (size == -1)
throw new UserException("Cannot determine the file size [" +fileName + "]");
bArray = new byte[(int) size];
int rb = 0;
int chunk = 0;
while (((int) size - rb) > 0) {
chunk = bis.read(bArray, rb, (int) size - rb);
if (chunk == -1)
break;
rb += chunk;
}//end of while (((int)size - rb) > 0)
//instantiate the CRC32
CRC32 crc = new CRC32() ;
crc.update(bArray, 0, size);
//instantiate the ZipEntry
zentry = new ZipEntry(fileName) ;
zentry.setMethod(ZipEntry.STORED) ;
zentry.setSize(size);
zentry.setCrc(crc.getValue());
//write all the info to the ZipOutputStream
zos.putNextEntry(zentry);
zos.write(bArray, 0, size);
zos.closeEntry();
catch (ZipException ze) {
throw ze ;
catch (FileNotFoundException fnfe) {
throw fnfe ;
catch (IOException ioe) {
throw ioe ;
catch (UserException ue) {
throw ue ;
finally {
//close all the stream and file
if (bis != null)
bis.close();
if (file != null)
file = null ;
}//end of try-catch-finally
}Tried~
The problem is still here~ >___<
Anyway, thanks for information sharing~
The message is:
Cannot open file: it does not appear to be a valid archive.
If you downloaded this file, try downloading the file again.
The problem may be here:
if (fos != null)
fos.close() ;
if (bos != null)
bos.close();
if (zos != null)
zos.close();
if (file != null)
file = null ;
The fos is closed before bos so the last buffer is not
saved.
zos.close() is enough.
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