java getentry_ZipEntry getEntry(String name)

ZipEntry getEntry(String name)

描述 (Description)

java.util.zip.ZipFile.getEntry(String name)方法返回指定名称的zip文件条目，如果未找到，则返回null。

声明 (Declaration)

以下是java.util.zip.ZipFile.getEntry(String name)方法的声明。public ZipEntry getEntry(String name)

参数 (Parameters)name – 条目的名称。

返回值 (Returns)

zip文件条目，如果未找到则为null。

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.ZipFile.getEntry(String name)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 ZipFileDemo {

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);

zipEntry.setComment(“This is a sample 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);

try {

ZipEntry entry = file.getEntry(SOURCE_FILE);

if(entry != null){

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();

}

}

}

让我们编译并运行上面的程序，这将产生以下结果 -File: D:\test\Hello.txt Size 1024 Modified on 05/22/17

Zip file D:\test\Hello.txt extracted successfully.