压缩源码：
package com.journaldev.files;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class ZipFiles {
List<String> filesListInDir = new ArrayList<String>();
public static void main(String[] args) {
File file = new File("/Users/pankaj/sitemap.xml");
String zipFileName = "/Users/pankaj/sitemap.zip";
File dir = new File("/Users/pankaj/tmp");
String zipDirName = "/Users/pankaj/tmp.zip";
zipSingleFile(file, zipFileName);
ZipFiles zipFiles = new ZipFiles();
zipFiles.zipDirectory(dir, zipDirName);
}
/**
* This method zips the directory
* @param dir
* @param zipDirName
*/
private void zipDirectory(File dir, String zipDirName) {
try {
populateFilesList(dir);
//now zip files one by one
//create ZipOutputStream to write to the zip file
FileOutputStream fos = new FileOutputStream(zipDirName);
ZipOutputStream zos = new ZipOutputStream(fos);
for(String filePath : filesListInDir){
System.out.println("Zipping "+filePath);
//for ZipEntry we need to keep only relative file path, so we used substring on absolute path
ZipEntry ze = new ZipEntry(filePath.substring(dir.getAbsolutePath().length()+1, filePath.length()));
zos.putNextEntry(ze);
//read the file and write to ZipOutputStream
FileInputStream fis = new FileInputStream(filePath);
byte[] buffer = new byte[1024];
int len;
while ((len = fis.read(buffer)) > 0) {
zos.write(buffer, 0, len);
}
zos.closeEntry();
fis.close();
}
zos.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* This method populates all the files in a directory to a List
* @param dir
* @throws IOException
*/
private void populateFilesList(File dir) throws IOException {
File[] files = dir.listFiles();
for(File file : files){
if(file.isFile()) filesListInDir.add(file.getAbsolutePath());
else populateFilesList(file);
}
}
/**
* This method compresses the single file to zip format
* @param file
* @param zipFileName
*/
private static void zipSingleFile(File file, String zipFileName) {
try {
//create ZipOutputStream to write to the zip file
FileOutputStream fos = new FileOutputStream(zipFileName);
ZipOutputStream zos = new ZipOutputStream(fos);
//add a new Zip Entry to the ZipOutputStream
ZipEntry ze = new ZipEntry(file.getName());
zos.putNextEntry(ze);
//read the file and write to ZipOutputStream
FileInputStream fis = new FileInputStream(file);
byte[] buffer = new byte[1024];
int len;
while ((len = fis.read(buffer)) > 0) {
zos.write(buffer, 0, len);
}
//Close the zip entry to write to zip file
zos.closeEntry();
//Close resources
zos.close();
fis.close();
fos.close();
System.out.println(file.getCanonicalPath()+" is zipped to "+zipFileName);
} catch (IOException e) {
e.printStackTrace();
}
}
}
结果：
上面的Java zip示例程序的输出为：
/Users/pankaj/sitemap.xml is zipped to /Users/pankaj/sitemap.zip
Zipping /Users/pankaj/tmp/.DS_Store
Zipping /Users/pankaj/tmp/data/data.dat
Zipping /Users/pankaj/tmp/data/data.xml
Zipping /Users/pankaj/tmp/data/xmls/project.xml
Zipping /Users/pankaj/tmp/data/xmls/web.xml
Zipping /Users/pankaj/tmp/data.Xml
Zipping /Users/pankaj/tmp/DB.xml
Zipping /Users/pankaj/tmp/item.XML
Zipping /Users/pankaj/tmp/item.xsd
Zipping /Users/pankaj/tmp/ms/data.txt
Zipping /Users/pankaj/tmp/ms/project.doc
解压源码:
package com.journaldev.files;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class UnzipFiles {
public static void main(String[] args) {
String zipFilePath = "/Users/pankaj/tmp.zip";
String destDir = "/Users/pankaj/output";
unzip(zipFilePath, destDir);
}
private static void unzip(String zipFilePath, String destDir) {
File dir = new File(destDir);
// create output directory if it doesn't exist
if(!dir.exists()) dir.mkdirs();
FileInputStream fis;
//buffer for read and write data to file
byte[] buffer = new byte[1024];
try {
fis = new FileInputStream(zipFilePath);
ZipInputStream zis = new ZipInputStream(fis);
ZipEntry ze = zis.getNextEntry();
while(ze != null){
String fileName = ze.getName();
File newFile = new File(destDir + File.separator + fileName);
System.out.println("Unzipping to "+newFile.getAbsolutePath());
//create directories for sub directories in zip
new File(newFile.getParent()).mkdirs();
FileOutputStream fos = new FileOutputStream(newFile);
int len;
while ((len = zis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
fos.close();
//close this ZipEntry
zis.closeEntry();
ze = zis.getNextEntry();
}
//close last ZipEntry
zis.closeEntry();
zis.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
结果：
Unzipping to /Users/pankaj/output/.DS_Store
Unzipping to /Users/pankaj/output/data/data.dat
Unzipping to /Users/pankaj/output/data/data.xml
Unzipping to /Users/pankaj/output/data/xmls/project.xml
Unzipping to /Users/pankaj/output/data/xmls/web.xml
Unzipping to /Users/pankaj/output/data.Xml
Unzipping to /Users/pankaj/output/DB.xml
Unzipping to /Users/pankaj/output/item.XML
Unzipping to /Users/pankaj/output/item.xsd
Unzipping to /Users/pankaj/output/ms/data.txt
Unzipping to /Users/pankaj/output/ms/project.doc
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