Java program compresses and decompresses zip files
Summary of knowledge you need to know:
DeflaterOutputStream: the base class of the compressed class.
ZipOutputStream: a subclass of DeflaterOutputStream that compresses data into Zip file format
GZIPOutputStream: a subclass of DeflaterOutputStream that compresses data into GZip file format
InflaterInputStream: the base class of the decompressed class
ZipInputStream: a subclass of InflaterInputStream that decompresses data in Zip format
GZIPInputStream: a subclass of InflaterInputStream that decompresses data in Zip format
ZipEntry class: represents an ZIP file entry
ZipFile class: this class is used to read entries from ZIP files
Name the list of files within the zip with zipentry.
Use FileInputStream to read the file.
Write compressed files in the zipoutputstream output stream.
The logic is simple and easy to understand, and the attachment has an example, which can be run after decompression.
Baidu network disk example link: https://pan.baidu.com/s/1VSs-UqtU_3Lld2H7-1dMMg
Extraction code: mcb3
Package com.crscd.server.web.cbtc2.filezip
Import java.io.BufferedInputStream
Import java.io.BufferedOutputStream
Import java.io.BufferedReader
Import java.io.File
Import java.io.FileInputStream
Import java.io.FileOutputStream
Import java.io.InputStreamReader
Public class FileZip {
/ *
Author:zhao_anan 20190424 zip compress program
/
/ public void zip (ZipOutputStream out, File f, String base, boolean first)
Throws Exception {
If (first) {
If (f.isDirectory ()) {
Out.putNextEntry (new ZipEntry (/))
Base = base + f.getName ()
First = false
} else
Base = f.getName ()
}
If (f.isDirectory ()) {
File [] fl = f.listFiles ()
Base = base + "/"
For (int I = 0; I < fl.length; iTunes +) {
Zip (out, fl [I], base + FLI] .getName (), first)
}
} else {
Out.putNextEntry (new ZipEntry (base))
FileInputStream in = new FileInputStream (f)
Int b
System.out.println (base)
While ((b = in.read ())! =-1) {
Out.write (b)
}
In.close ()
}
} * /
/ *
Unzip
/
/ public void unZipFileByOpache (ZipFile zipFile, String unZipRoot)
Throws Exception, IOException {
Enumeration e = zipFile.entries ()
ZipEntry zipEntry
While (e.hasMoreElements ()) {
ZipEntry = (ZipEntry) e.nextElement ()
InputStream fis = zipFile.getInputStream (zipEntry)
If (zipEntry.isDirectory ()) {
} else {
File file = new File (unZipRoot + File.separator
ZipEntry.getName ()
System.out.println (unZipRoot + File.separatorzipEntry.getName ())
File parentFile = file.getParentFile ()
ParentFile.mkdirs ()
FileOutputStream fos = new FileOutputStream (file)
Byte [] b = new byte [1024]
Int len
While (len = fis.read (b, 0, b.length))! =-1) {
Fos.write (b, 0, len)
}
Fos.close ()
Fis.close ()
}
}
}
Public void ZipFile (String zipFileName, String inputFileName)
Throws Exception {
ZipOutputStream out = new ZipOutputStream (new FileOutputStream (
ZipFileName))
File inputFile = new File (inputFileName)
Zip (out, inputFile, "", true)
System.out.println ("zip done")
Out.close ()
}
Public void unZipFile (String unZipFileName, String unZipPath)
Throws Exception {
/ / ZipFile zipFile = new ZipFile (unZipFileName)
/ / unZipFileByOpache (zipFile, unZipPath)
System.out.println ("unZip Ok")
}
Public static void main (String [] args) throws Exception {
FileZip fileZip = new FileZip ()
/ / ZipFile ("d:/testfile.zip", "d:/TTPlayer")
FileZip.unZipFile ("d:/20120206_SLIS_0002_DY2.zip", "dvl /")
} * /
/ * *
Unzip file 20190424@auther: zhao_anan@param unzipRoot
, /
Public void unZipFile (String zipFilename, String unzipRoot)
Throws Exception {
BufferedOutputStream bos = null
FileInputStream fis = new FileInputStream (zipFilename)
BufferedInputStream bis = new BufferedInputStream (fis)
ZipInputStream zis = new ZipInputStream (bis); ZipEntry entry = null;int count = 0 X byte buf [] = new byte [1024]; while ((entry = zis.getNextEntry ())! = null) {if (entry.isDirectory ()) {} else {File file = new File (unzipRoot + File.separator + entry.getName ()); File parentFile = file.getParentFile (); parentFile.mkdirs () Bos = new BufferedOutputStream (new FileOutputStream (file)); while ((count = zis.read (buf))! =-1) {bos.write (buf, 0, count);} bos.flush (); bos.close ();}} zis.close ()
}
/ * *
Zip@param zipFilename@param unzipRoot
, /
Private void zip (ZipOutputStream out, File f, String base, boolean first)
Throws Exception {
If (first) {
If (f.isDirectory ()) {
Out.putNextEntry (new ZipEntry (/))
Base = base + f.getName ()
First = false
} else
Base = f.getName ()
}
If (f.isDirectory ()) {
File [] fl = f.listFiles ()
Base = base + "/"
For (int I = 0; I < fl.length; iTunes +) {
Zip (out, fl [I], base + FLI] .getName (), first)
}
} else {
Out.putNextEntry (new ZipEntry (base))
/ / FileInputStream in = new FileInputStream (f)
BufferedReader in = new BufferedReader (new InputStreamReader (
New FileInputStream (f), "ISO8859_1"))
Int b
System.out.println (base)
While ((b = in.read ())! =-1) {
Out.write (b)
}
In.close ()
}
}
Public void zipFile (String zipFileName, String inputFileName)
Throws Exception {
ZipOutputStream out = new ZipOutputStream (new FileOutputStream (
ZipFileName))
File inputFile = new File (inputFileName)
Zip (out, inputFile, "", true)
System.out.println ("zip done")
Out.close ()
}
/ * *
Zip@param zipFilename@param unzipRoot
, /
Private void zipList (ZipOutputStream out, String [] fileList, String base)
Throws Exception {
Base = base + "\"
For (int I = 0; I < fileList.length; iTunes +) {
/ / zip (out, base + fileList [I], first)
Out.putNextEntry (new ZipEntry (fileList [I]))
BufferedReader in = new BufferedReader (new InputStreamReader (
New FileInputStream (base + fileList [I]), "ISO8859_1"))
Int b
System.out.println (base + fileList [I])
While ((b = in.read ())! =-1) {
Out.write (b)
}
In.close ()
}
}
Public void zipListFile (String zipFileName, String inputListFiles, String baseurl)
Throws Exception {
ZipOutputStream out = new ZipOutputStream (new FileOutputStream (
ZipFileName))
String [] FileList = inputListFiles.split (",")
ZipList (out, FileList, baseurl)
System.out.println ("zip done")
Out.close ()
}
Public static void main (String [] args) {
/ / Compression test FileZip tFileZip = new FileZip (); String tinputFileName = "E:\\ temp"; String baseurl = "E:\\ temp"; String tzipFileName = "E:\\ temp.zip"; String inputListFiles = "application-dev.yml,auto_arrange.yml"; try {/ / tFileZip.zipFile (tzipFileName, tinputFileName); tFileZip.zipListFile (tzipFileName, inputListFiles, baseurl); / / tFileZip.unZipFile (tzipFileName, baseurl + "unzip") } catch (Exception e) {/ / TODO Auto-generated catch block e.printStackTrace ();}
}
}
