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Java 压缩解压缩文件

程序员文章站 2022-05-15 10:58:43
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import java.io.File;    
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;

public class CompressFile {
private static CompressFile instance = new CompressFile();

private CompressFile() {
}

public static CompressFile getInstance() {
return instance;
}

public synchronized void zip(String inputFilename, String zipFilename)
throws IOException {
zip(new File(inputFilename), zipFilename);
}

public synchronized void zip(File inputFile, String zipFilename) throws IOException {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
zipFilename));

try {
zip(inputFile, out, "");
} catch (IOException e) {
throw e;
} finally {
out.close();
}
}

private synchronized void zip(File inputFile, ZipOutputStream out, String base)
throws IOException {
if (inputFile.isDirectory()) {
File[] inputFiles = inputFile.listFiles();
out.putNextEntry(new ZipEntry(base + "/"));
base = base.length() == 0 ? "" : base + "/";
for (int i = 0; i < inputFiles.length; i++) {
zip(inputFiles[i], out, base + inputFiles[i].getName());
}

} else {
if (base.length() > 0) {
out.putNextEntry(new ZipEntry(base));
} else {
out.putNextEntry(new ZipEntry(inputFile.getName()));
}

FileInputStream in = new FileInputStream(inputFile);
try {
int c;
byte[] by = new byte[BUFFEREDSIZE];
while ((c = in.read(by)) != -1) {
out.write(by, 0, c);
}
} catch (IOException e) {
throw e;
} finally {
in.close();
}
}
}

public synchronized void unzip(String zipFilename, String outputDirectory)
throws IOException {
File outFile = new File(outputDirectory);
if (!outFile.exists()) {
outFile.mkdirs();
}

ZipFile zipFile = new ZipFile(zipFilename);
Enumeration en = zipFile.getEntries();
ZipEntry zipEntry = null;
while (en.hasMoreElements()) {
zipEntry = (ZipEntry) en.nextElement();
if (zipEntry.isDirectory()) {
// mkdir directory
String dirName = zipEntry.getName();
dirName = dirName.substring(0, dirName.length() - 1);

File f = new File(outFile.getPath() + File.separator + dirName);
f.mkdirs();

} else {
// unzip file
File f = new File(outFile.getPath() + File.separator
+ zipEntry.getName());
f.createNewFile();
InputStream in = zipFile.getInputStream(zipEntry);
FileOutputStream out = new FileOutputStream(f);
try {
int c;
byte[] by = new byte[BUFFEREDSIZE];
while ((c = in.read(by)) != -1) {
out.write(by, 0, c);
}
// out.flush();
} catch (IOException e) {
throw e;
} finally {
out.close();
in.close();
}
}
}
}

private static final int BUFFEREDSIZE = 1024;

public static void main(String[] args) {
CompressFile bean = new CompressFile();
try {
bean.zip("d:/temp", "d:/test.zip");

bean.unzip("d:/test.zip", "d:/out/temp");
} catch (IOException e) {
e.printStackTrace();
}
}
}