java解析zip

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import org.apache.tools.zip.*;

public void releaseZipToFile(String sourceZip, String outFileName)
throws IOException {
ZipFile zfile = new ZipFile(sourceZip);
Enumeration zList = zfile.getEntries();
ZipEntry ze = null;
byte[] buf = new byte[1024];
while (zList.hasMoreElements()) {
// 从ZipFile中得到一个ZipEntry
ze = (ZipEntry) zList.nextElement();
if (ze.isDirectory()) {
continue;
}
// 以ZipEntry为参数得到一个InputStream，并写到OutputStream中
OutputStream os = new BufferedOutputStream(new FileOutputStream(
getRealFileName(outFileName, ze.getName())));
InputStream is = new BufferedInputStream(zfile.getInputStream(ze));
int readLen = 0;
while ((readLen = is.read(buf, 0, 1024)) != -1) {
os.write(buf, 0, readLen);
}
is.close();
os.close();
System.out.println("Extracted: " + ze.getName());
}
zfile.close();
}