Object clone()
描述 (Description)
java.util.zip.ZipEntry.clone()方法返回此条目的副本。
声明 (Declaration)
以下是java.util.zip.ZipEntry.clone()方法的声明。
public Object clone()
返回值 (Returns)
这个实例的克隆。
先决条件
在D:》 test 》目录中创建一个文件Hello.txt，其中包含以下内容。
This is an example.
例子 (Example)
以下示例显示了java.util.zip.ZipEntry.clone（）方法的用法。
package com.iowiki;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Enumeration;
import java.util.zip.Adler32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
public class ZipEntryDemo {
private static String SOURCE_FILE = "D:\\test\\Hello.txt";
private static String TARGET_FILE = "D:\\test\\Hello.zip";
public static void main(String[] args) {
try {
createZipFile();
readZipFile();
} catch(IOException ioe) {
System.out.println("IOException : " + ioe);
}
}
private static void createZipFile() throws IOException{
FileOutputStream fout = new FileOutputStream(TARGET_FILE);
CheckedOutputStream checksum = new CheckedOutputStream(fout, new Adler32());
ZipOutputStream zout = new ZipOutputStream(checksum);
FileInputStream fin = new FileInputStream(SOURCE_FILE);
zout.putNextEntry(new ZipEntry(SOURCE_FILE));
int length;
byte[] buffer = new byte[1024];
while((length = fin.read(buffer)) > 0) {
zout.write(buffer, 0, length);
}
zout.closeEntry();
fin.close();
zout.close();
}
private static void readZipFile() throws IOException{
final ZipFile file = new ZipFile(TARGET_FILE);
System.out.println("Iterating over zip file : " + TARGET_FILE);
try {
final Enumeration<? extends ZipEntry> entries = file.entries();
while (entries.hasMoreElements()) {
final ZipEntry entry = entries.nextElement();
System.out.printf("File: %s Size %d Modified on %TD %n",
entry.getName(), entry.getSize(),
new Date(entry.getTime()));
ZipEntry clonedEntry = (ZipEntry)entry.clone();
extractFile(clonedEntry, file.getInputStream(clonedEntry));
}
System.out.printf("Zip file %s extracted successfully.", SOURCE_FILE);
}
finally {
file.close();
}
}
private static void extractFile(final ZipEntry entry, InputStream is)
throws IOException {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(entry.getName());
final byte[] buf = new byte[1024];
int read = 0;
int length;
while ((length = is.read(buf, 0, buf.length)) >= 0) {
fos.write(buf, 0, length);
}
} catch (IOException ioex) {
fos.close();
}
}
}
让我们编译并运行上面的程序，这将产生以下结果 -
Iterating over zip file : D:\test\Hello.zip
File: D:\test\Hello.txt Size 19 Modified on 05/19/17
Zip file D:\test\Hello.txt extracted successfully.
