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Release date November 16, 2015 Java technology lets you work and play in a very secure computing environment. Upgrading for the latest Java version increases the security within your system, as older versions don't include the latest security updates.
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Java software for the computer, or Java Runtime Environment, is additionally referred to as the Java Runtime, Runtime Environment, Runtime, JRE, Java Virtual Machine, Virtual Machine, Java VM, JVM, VM, Java plug-in, Java plugin, Java add-on or Java download.
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Provides classes with and writing the typical ZIP and GZIP file formats. An interface representing a data checksum.
A class which can be used to compute the Adler-32 checksum of an data stream.
An input stream that maintains a checksum in the data being read.
An output stream that maintains a checksum with the data being written.
A class which they can use to compute the CRC-32 of your data stream.
This class provides support for general purpose compression with all the popular ZLIB compression library.
Implements an input stream filter for compressing data inside the deflate compression format.
This class implements an output stream filter for compressing data from the deflate compression format.
This class implements a stream filter to read by compressed data within the GZIP data format.
This class implements a stream filter for writing compressed data inside the GZIP data format.
This class provides support for general purpose decompression while using the popular ZLIB compression library.
This class implements a stream filter for uncompressing data inside the deflate compression format.
Implements an output stream filter for uncompressing data stored inside the deflate compression format.
This class is needed to represent a ZIP file entry.
This class can be used to read entries from your zip file.
This class implements an input stream filter with files from the ZIP extendable.
This class implements an output stream filter for writing files within the ZIP data format.
Signals that your data format error has occurred.
Signals which a Zip exception of some type has occurred.
Signals that the unrecoverable error has occurred.
Provides classes to read by and writing the conventional ZIP and GZIP file formats. Also includes classes for compressing and decompressing data while using DEFLATE compression algorithm, which is employed by the ZIP and GZIP file formats. Additionally, you will discover utility classes for computing the CRC-32 and Adler-32 checksums of arbitrary input streams.
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more in depth, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and dealing code examples.
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Java can be a website utility allowing your computer to learn, process and display certain visual aspects of Internet pages, for instance graphics, animations and boards. Typically, Java is downloaded from your Java installation site inside the form of an file. However, it can also be easy to locate a website where you may download Java inside form of declare archival purposes.
Navigate towards the Java utility download page see References.
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Navigate on the Canadian Mind Products download site for Java utilities see References.
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Provides classes to read and writing the normal ZIP and GZIP file formats.
An interface representing a data checksum.
A class you can use to compute the Adler-32 checksum of your data stream.
An input stream that maintains a checksum on the data being read.
An output stream that maintains a checksum from the data being written.
A class you can use to compute the CRC-32 of your data stream.
This class provides support for general purpose compression while using the popular ZLIB compression library.
Implements an input stream filter for compressing data inside deflate compression format.
This class implements an output stream filter for compressing data inside the deflate compression format.
This class implements a stream filter to read by compressed data within the GZIP data format.
This class implements a stream filter for writing compressed data within the GZIP extendable.
This class provides support for general purpose decompression utilizing the popular ZLIB compression library.
This class implements a stream filter for uncompressing data inside the deflate compression format.
Implements an output stream filter for uncompressing data stored from the deflate compression format.
This class is employed to represent a ZIP file entry.
This class can be used to read entries from your zip file.
This class implements an input stream filter with files inside ZIP extendable.
This class implements an output stream filter for writing files within the ZIP extendable.
Signals that your data format error has occurred.
Signals a Zip exception of some sort or other has occurred.
Signals an unrecoverable error has occurred.
Provides classes with and writing the conventional ZIP and GZIP file formats. Also includes classes for compressing and decompressing data while using the DEFLATE compression algorithm, which is employed by the ZIP and GZIP file formats. Additionally, you can find utility classes for computing the CRC-32 and Adler-32 checksums of arbitrary input streams.
An implementation may optionally include the ZIP64tm format extensions defined from the PKWARE ZIP File Format Specification. The ZIP64tm format extensions are widely-used to overcome the type limitations in the original ZIP format.
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more descriptive, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and dealing code examples.
Scripting in this posting tracks web site traffic, but doesn't change the content by any means.
JavaScript is disabled on the browser.
Provides classes with and writing the typical ZIP and GZIP file formats.
An interface representing a data checksum.
A class you can use to compute the Adler-32 checksum of the data stream.
An input stream this maintains a checksum with the data being read.
An output stream that maintains a checksum on the data being written.
A class which you can use to compute the CRC-32 of the data stream.
This class provides support for general purpose compression while using the popular ZLIB compression library.
Implements an input stream filter for compressing data inside deflate compression format.
This class implements an output stream filter for compressing data within the deflate compression format.
This class implements a stream filter with compressed data within the GZIP formatting.
This class implements a stream filter for writing compressed data within the GZIP extendable.
This class provides support for general purpose decompression while using popular ZLIB compression library.
This class implements a stream filter for uncompressing data inside the deflate compression format.
Implements an output stream filter for uncompressing data stored from the deflate compression format.
This class is needed to represent a ZIP file entry.
This class can be used to read entries from your zip file.
This class implements an input stream filter to read files within the ZIP formatting.
This class implements an output stream filter for writing files inside ZIP formatting.
Signals that your data format error has occurred.
Signals which a Zip exception of some kind has occurred.
Signals that unrecoverable error has occurred.
Provides classes to read by and writing the normal ZIP and GZIP file formats. Also includes classes for compressing and decompressing data while using DEFLATE compression algorithm, which is employed by the ZIP and GZIP file formats. Additionally, you can find utility classes for computing the CRC-32 and Adler-32 checksums of arbitrary input streams.
An implementation may optionally secure the ZIP64tm format extensions defined because of the PKWARE ZIP File Format Specification. The ZIP64tm format extensions are widely used to overcome the type limitations on the original ZIP format.
APPENDIX D of PKWARE ZIP File Format Specification - Language Encoding Flag EFS to encode ZIP entry filename and comment fields using UTF-8.
For further API reference and developer documentation, see Java SE Documentation. That documentation contains better, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and code examples.
Scripting on this site tracks site traffic, but will not change the content the slightest bit.Many sources of data contain redundant data or data that contributes little to your stored information. This ends up with tremendous degrees of data being transferred between client and server applications or computers normally. The obvious solution for the problems of information storage and data transfer would be to install additional storage devices and expand existing communication facilities. To do so, however, requires an increase in a organizations operating costs. One method to alleviate a portion of knowledge storage and knowledge transfer is from the representation of internet data by extremely effective code. This article presents a shorter introduction to data compression and decompression, and shows tips on how to compress and decompress data, efficiently and conveniently, from the inside your Java applications with all the
these tools are being used as standalone applications. It is possible to invoke these power tools from your Java applications, but this may not be a straightforward approach rather than an efficient solution. This is especially true if you need to compress and decompress data about the fly before transferring it into a remote machine one example is. This article:
The simplest form of redundancy within a file may be the repetition of characters. For example, take into account the following string:
This string might be encoded more compactly by replacing each repeated string of characters using a single instance in the repeated character as well as a number to display the number of times it really is repeated. The earlier string could be encoded as follows:
Here 4B means four Bs, and 2H means two Hs, and many others. Compressing a string this way is called run-length encoding.
As another example, think about the storage of the rectangular image. As just one color bitmapped image, it may be stored as shown in Figure 1.
This says, the rectangle starts at coordinate 11, 3 of width 20 and length 5 pixels.
The first line above says how the first line on the bitmap is made of 40 0s. The third line says how the third line from the bitmap includes 10 0s and then 20 1s accompanied by 10 more 0s, and so forth for the other lines.
Note that run-length encoding requires separate representations to the file and its particular encoded version. Therefore, this process cannot help all files. Other compression techniques include variable-length encoding also referred to as Huffman Coding, and others. For more information, you will discover many books entirely on data and image compression techniques.
There a wide range of benefits to data compression. The main advantage of it, however, should be to reduce storage requirements. Also, for data communications, the transfer of compressed data on the medium ends up with an increase from the rate of knowledge transfer. Note that data compression may be implemented on existing hardware by software or using special hardware devices that incorporate compression techniques. Figure 2 shows a fundamental data-compression block diagram.
If you might be working on Windows, you will be familiar with all the WinZip tool, which is needed to make a compressed archive and also to extract files at a compressed archive. On UNIX, however, everything's done a tad differently. The
is employed to compress the archive.
act as both an archiver along with a compressor. They compress files and store them in a archive. On the other hand,
doesn't archive files. Therefore, on UNIX, the
command is employed to compress the archived file.
package for zip-compatible data compression. It provides classes that allow you to see, create, and modify ZIP and GZIP file formats. It also provides utility classes for computing checksums of arbitrary input streams you can use to validate input data. This package provides one interface, fourteen classes, as well as exception classes as shown in Table 1.
Represents a data checksum. Implemented from the classes
Note : The ZLIB compression library was developed as part in the Portable Network Graphics PNG standard that may be not protected by patents.
package provides classes for data compression and decompression. Decompressing a ZIP file is usually a matter of reading data from an input stream. The
class to read by ZIP files. A
could be created each and every other input stream. For example, these segment of code could be used to create an input stream to read data coming from a ZIP formatting:
FileInputStream fis new ; ZipInputStream zin new ZipInputStreamnew BufferedInputStreamfis;
Once a ZIP input stream is opened, you'll be able to read the zip entries while using the
object. If the end-of-file is reached,
ZipEntry entry; whileentry ! null //extract data//open output streams
Now, it can be time to setup a decompressed output stream, which is usually done as follows:
int BUFFER 2048; FileOutputStream fos new ; BufferedOutputStream dest new BufferedOutputStreamfos, BUFFER;
use internal buffer sizes of 512. The use from the
is only justified if your size from the buffer is a bit more than 512 within this example it's set to 2048. While the
doesnt let you set the buffer size, inside the case on the
however, you'll be able to specify the inner buffer size being a constructor argument.
In this segment of code, data output stream is created while using entrys name, which might be retrieved with all the
method. Source zipped results are then read and written towards the decompressed stream:
while count data, 0, BUFFER! - 1 x; data, 0, count;
And finally, close the input and output streams:
The source enter in Code Sample 1 shows how you can decompress and extract files from your ZIP archive. To test this sample, compile the category and run it by passing a compressed file in ZIP format:
could be described as a ZIP archive made using any ZIP-compatible tool, like WinZip.
import ; import ; public class UnZip final int BUFFER 2048; public static void main String argv try BufferedOutputStream dest null; FileInputStream fis new FileInputStreamargv0; ZipInputStream zis new ZipInputStreamnew BufferedInputStreamfis; ZipEntry entry; whileentry ! null Extracting: entry; int count; byte data new byteBUFFER;//write the files to your disk FileOutputStream fos new ; dest new BufferedOutputStreamfos, BUFFER; while count data, 0, BUFFER! - 1 data, 0, count; ; ; ; catchException e ;
class reads ZIP files sequentially. The class
however, reads the contents of the ZIP file employing a random access file internally so how the entries from the ZIP file tend not to have to be read sequentially.
is with regard to caching. Zip entries aren't cached in the event the file is read having a combination of
However, when the file is opened using
then it really is cached internally, so if
is termed again the file is opened one time. The cached value is utilized on the second open. If you focus on UNIX, it really is worth noting that each one zip files opened using
are memory mapped, and so the performance of
If the contents on the same zip file, however, are be to frequently changed and reloaded during program execution, then using
ZipFile zipfile new ;
object, to loop through all the
entry ZipEntry ;//read contents and save them
is completely entry;
byte data new byteBUFFER; FileOutputStream fos new ; dest new BufferedOutputStreamfos, BUFFER; while count data, 0, BUFFER! - 1 data, 0, count;
Finally, close all input and output streams:
The complete source program is shown in Code Sample 2. Again, to find out this class, compile it and run it by passing a file in a very ZIP format for an argument:
import ; import ; import ; public class UnZip2 static final int BUFFER 2048; public static void main String argv try BufferedOutputStream dest null; BufferedInputStream is null; ZipEntry entry; ZipFile zipfile new ZipFileargv0; Enumeration e ; entry ZipEntry ; Extracting: entry; is completely new BufferedInputStream entry; int count; byte data new byteBUFFER; FileOutputStream fos new ; dest new BufferedOutputStreamfos, BUFFER; while count data, 0, BUFFER! - 1 data, 0, count; ; ; ; catchException e ;
might be used to compress data with a ZIP file. The
writes data to a output stream within a ZIP format. There are a number of steps linked to creating a ZIP file.
object, in which we pass the output stream in the file you want to write to. Here is how you produce a ZIP file entitled :
FileOutputStream dest new ; ZipOutputStream out new ZipOutputStreamnew BufferedOutputStreamdest;
Once the mark zip output stream is made, the next step is always to open the origin data file. In this example, source information are those files within the current directory. The
File f new File.; String files ; for int i0; ; i Adding: filesi; FileInputStream fi new FileInputStreamfilesi;//create zip entry//add entries to ZIP file
Note : This code sample is capable of doing compressing all files inside the current directory. It doesnt handle subdirectories. As an exercise, you might modify Code Sample 3 to deal with subdirectories.
Before it is possible to write data to your ZIP output stream, you need to first place the zip entry object utilizing the
int count; whilecount data, 0, BUFFER! - 1 data, 0, count;
Finally, you close the input and output streams:
The complete source program is shown in Code Sample 3.
import ; import ; public class Zip static final int BUFFER 2048; public static void main String argv try BufferedInputStream origin null; FileOutputStream dest new ; ZipOutputStream out new ZipOutputStreamnew BufferedOutputStreamdest; ; byte data new byteBUFFER;//get an index of files from current directory File f new File.; String files ; for int i0; ; i Adding: filesi; FileInputStream fi new FileInputStreamfilesi; origin new BufferedInputStreamfi, BUFFER; ZipEntry entry new ZipEntryfilesi; entry; int count; whilecount data, 0, BUFFER! - 1 data, 0, count; ; ; catchException e ;
Note : Entries is usually added with a ZIP file either within a compressed DEFLATED or uncompressed STORED form. The
is usually used to set the tactic of storage. For example, to set the technique to DEFLATED compressed use:
class describes a compressed file stored in the ZIP file. The various methods contained with this class is usually used setting and get pieces of knowledge about the entry. The
to publish ZIP files. Some from the most useful methods available within the
class are shown, along having a description, in Table 2.
Returns the comment string to the entry, null if none
Returns the compressed size with the entry, - 1 or even known
Returns the compression method in the entry, - 1 otherwise specified
Returns the uncompressed zip on the entry, - 1 if unknown
Returns the progres time from the entry, - 1 or even specified
classes, which implement the
interface and compute the checksums important for data compression. The
method might be used to receive the current value with the checksum. The
method may be used to reset the checksum to its default value.
Checksums might be used to mask corrupted files or messages. For example, suppose you need to create a ZIP file then transfer it to some remote machine. Once it can be at the remote machine, while using checksum you'll be able to check whether or not the file got corrupted over the transmission. To demonstrate how you can create checksums, we modify Code Sample 1 and Code Sample 3 to use
as shown in Code Sample 4 and Code Sample 5.
import ; import ; public class Zip static final int BUFFER 2048; public static void main String argv try BufferedInputStream origin null; FileOutputStream dest new ; CheckedOutputStream checksum new CheckedOutputStreamdest, new Adler32; ZipOutputStream out new ZipOutputStreamnew BufferedOutputStreamchecksum; ; byte data new byteBUFFER;//get a listing of files from current directory File f new File.; String files ; for int i0; ; i Adding: filesi; FileInputStream fi new FileInputStreamfilesi; origin new BufferedInputStreamfi, BUFFER; ZipEntry entry new ZipEntryfilesi; entry; int count; whilecount data, 0, BUFFER! - 1 data, 0, count; ; ; checksum: ; catchException e ;
import ; import ; public class UnZip public static void main String argv try final int BUFFER 2048; BufferedOutputStream dest null; FileInputStream fis new FileInputStreamargv0; CheckedInputStream checksum new CheckedInputStreamfis, new Adler32; ZipInputStream zis new ZipInputStreamnew BufferedInputStreamchecksum; ZipEntry entry; whileentry ! null Extracting: entry; int count; byte data new byteBUFFER;//write the files towards the disk FileOutputStream fos new ; dest new BufferedOutputStreamfos, BUFFER; while count data, 0, BUFFER! - 1 data, 0, count; ; ; ; Checksum: ; catchException e ;
To test Code Sample 4 and 5, compile the classes and run the
class to decompress the archive a checksum value are going to be printed around the console. The two values should be exactly precisely the same, otherwise the file is corrupted. Checksums are certainly useful in validating data. For example, you are able to create a ZIP file and send it in your friend along having a checksum. Your friend unzips the file and compares the checksum together with the one you provided, if they are a similar your friend knows which the file is authentic.
We have seen the way to compress data accessible in file form and add it in an archive. But what if your data you would like to compress just isn't available inside a file? Assume as an example, that that you are transferring large objects over sockets. To improve performance of the application, you might like to compress the objects before sending them throughout the network and uncompress them in the destination. As another example, lets say you wish to save objects around the disk in compressed format. The
format, that's record-based, is just not really appropriate for this job. The GZIP is much more appropriate because it operates on one particular stream of information.
Now, lets see an example of how you can compress objects before writing them on disk and how you can decompress them after looking at them through the disk. Code Sample 6 is really a simple class that implements the
that you want to serialize instances of these types.
import ; public class Employee implements Serializable String name; int age; int salary; public EmployeeString name, int age, int salary name; age; salary; public void print Record for: name; Name: name; Age: age; Salary: salary;
Now, write another class that can cause a few objects in the
class. Code Sample 7 creates two objects
class, then saves their state in the file in a very compressed format.
import ; import ; public class SaveEmployee public static void mainString argv throws Exception //create some objects Employee sarah new EmployeeS. Jordan, 28, 56000; Employee sam new EmployeeS. McDonald, 29, 58000;//serialize the objects sarah and sam FileOutputStream fos new FileOutputStreamdb; GZIPOutputStream gz new GZIPOutputStreamfos; ObjectOutputStream oos new ObjectOutputStreamgz; sarah; sam; ; ; ;
class shown in Code Sample 8 can be used to reconstruct the state from the two objects. Once the state continues to be constructed the
method is invoked in it.
import ; import ; public class ReadEmployee public static void mainString argv throws Exception//deserialize objects sarah and sam FileInputStream fis new FileInputStreamdb; GZIPInputStream gs new GZIPInputStreamfis; ObjectInputStream ois new ObjectInputStreamgs; Employee sarah Employee ; Employee sam Employee ;//print the records after reconstruction of state ; ; ; ;
The same idea may be used to compress large objects that happen to be sent over sockets. The following segment of code show how you can write objects in the compressed format, in the server on the client:
write to client GZIPOutputStream gzipout new ; ObjectOutputStream oos new ObjectOutputStreamgzipout; obj; ;
And, this segment of code shows tips on how to decompress the objects with the client side once received in the server:
read from server Socket socket new SocketremoteServerIP, PORT; GZIPInputStream gzipin new ; ObjectInputStream ois new ObjectInputStreamgzipin; Object o ;
The Java ARchive JAR format is based on the normal ZIP formatting with an optional manifest file. If you want to create JAR files or extract files from the JAR file from inside your Java applications, use the
package, that gives classes to read and writing JAR files. Using the classes provided from the
package as described in this particular article. Therefore, you need to be able to adapt much with the code with this article in order to use the
This article discussed the APIs that you may use to compress and decompress data from the inside of your applications, with code samples during the entire article to show the best way to use the
package to compress and decompress data. Now you have the various tools to utilize data compression and decompression as part of your applications.
The article also shows the way to compress and decompress data for the fly to be able to reduce network traffic and help the performance of your respective client/server applications. Compressing data about the fly, however, increases the performance of client/server applications only once the objects being compressed tend to be more than a few hundred bytes. You would not be capable of observe improvement in performance when the objects being compressed and transferred are simple
Qusay H. Mahmoud provides Java consulting and training services. He has published a large number of articles on Java, and would be the author of Distributed Programming with Java Manning Publications, 1999 and Learning Wireless Java OReilly, 2002.
As officially used on this web site, the terms Java virtual machine or JVM mean a virtual machine to the Java platform.
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