java.util.zip.ZipEntry.getSize()方法条目数据的未压缩大小，如果未知，则为-1。

声明

以下是java.util.zip.ZipEntry.getSize()方法的声明。

public long getSize()

返回值

条目数据的未压缩大小，如果未知，则为-1。

前提条件

在D:test>目录下用以下内容创建一个文件Hello.txt。

This is an example.

示例

以下示例显示了java.util.zip.ZipEntry.getSize()方法的用法。

package com.yiibai; 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); ZipEntry zipEntry = new ZipEntry(SOURCE_FILE); zout.putNextEntry(zipEntry); 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())); extractFile(entry, file.getInputStream(entry)); } 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(); } } }

编译并运行上面程序，将会产生以下结果 –

Iterating over zip file : D:testHello.zip File: D:testHello.txt Size 19 Modified on 05/20/17 Zip file D:testHello.txt extracted successfully.

¥ 我要打赏   纠错/补充 收藏