java zip 文件夹

Today we will look into java zip file example. We will also compress a folder and create zip file using java program.

今天，我们将研究java zip文件示例。 我们还将使用Java程序压缩文件夹并创建zip文件。

Java ZIP (Java ZIP)

java.util.zip.ZipOutputStream can be used to compress a file into ZIP format. Since a zip file can contain multiple entries, ZipOutputStream uses java.util.zip.ZipEntry to represent a zip file entry.

java.util.zip.ZipOutputStream可用于将文件压缩为ZIP格式。 由于一个zip文件可以包含多个条目，因此ZipOutputStream使用java.util.zip.ZipEntry表示一个zip文件条目。

Java ZIP文件 (Java ZIP File)

Creating a zip archive for a single file is very easy, we need to create a ZipOutputStream object from the FileOutputStream object of destination file. Then we add a new ZipEntry to the ZipOutputStream and use FileInputStream to read the source file to ZipOutputStream object. Once we are done writing, we need to close ZipEntry and release all the resources.

为单个文件创建一个zip存档非常容易，我们需要从目标文件的FileOutputStream对象创建一个ZipOutputStream对象。 然后，我们向ZipOutputStream添加一个新的ZipEntry，并使用FileInputStream将源文件读取到ZipOutputStream对象。 完成编写后，我们需要关闭ZipEntry并释放所有资源。

Java Zip文件夹 (Java Zip Folder)

Zipping a directory is little tricky, first we need to get the files list as absolute path. Then process each one of them separately. We need to add a ZipEntry for each file and use FileInputStream to read the content of the source file to the ZipEntry corresponding to that file.

压缩目录有点棘手，首先我们需要获取文件列表作为绝对路径。 然后分别处理每个。 我们需要为每个文件添加一个ZipEntry，并使用FileInputStream将源文件的内容读取到与该文件相对应的ZipEntry。

Java Zip示例 (Java Zip Example)

Here is the java program showing how to zip a single file or zip a folder in java.

这是显示如何在Java中压缩单个文件或压缩文件夹的Java程序。

package com.journaldev.files;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;public class ZipFiles {List<String> filesListInDir = new ArrayList<String>();public static void main(String[] args) {File file = new File("/Users/pankaj/sitemap.xml");String zipFileName = "/Users/pankaj/sitemap.zip";File dir = new File("/Users/pankaj/tmp");String zipDirName = "/Users/pankaj/tmp.zip";zipSingleFile(file, zipFileName);ZipFiles zipFiles = new ZipFiles();zipFiles.zipDirectory(dir, zipDirName);}/*** This method zips the directory* @param dir* @param zipDirName*/private void zipDirectory(File dir, String zipDirName) {try {populateFilesList(dir);//now zip files one by one//create ZipOutputStream to write to the zip fileFileOutputStream fos = new FileOutputStream(zipDirName);ZipOutputStream zos = new ZipOutputStream(fos);for(String filePath : filesListInDir){System.out.println("Zipping "+filePath);//for ZipEntry we need to keep only relative file path, so we used substring on absolute pathZipEntry ze = new ZipEntry(filePath.substring(dir.getAbsolutePath().length()+1, filePath.length()));zos.putNextEntry(ze);//read the file and write to ZipOutputStreamFileInputStream fis = new FileInputStream(filePath);byte[] buffer = new byte[1024];int len;while ((len = fis.read(buffer)) > 0) {zos.write(buffer, 0, len);}zos.closeEntry();fis.close();}zos.close();fos.close();} catch (IOException e) {e.printStackTrace();}}/*** This method populates all the files in a directory to a List* @param dir* @throws IOException*/private void populateFilesList(File dir) throws IOException {File[] files = dir.listFiles();for(File file : files){if(file.isFile()) filesListInDir.add(file.getAbsolutePath());else populateFilesList(file);}}/*** This method compresses the single file to zip format* @param file* @param zipFileName*/private static void zipSingleFile(File file, String zipFileName) {try {//create ZipOutputStream to write to the zip fileFileOutputStream fos = new FileOutputStream(zipFileName);ZipOutputStream zos = new ZipOutputStream(fos);//add a new Zip Entry to the ZipOutputStreamZipEntry ze = new ZipEntry(file.getName());zos.putNextEntry(ze);//read the file and write to ZipOutputStreamFileInputStream fis = new FileInputStream(file);byte[] buffer = new byte[1024];int len;while ((len = fis.read(buffer)) > 0) {zos.write(buffer, 0, len);}//Close the zip entry to write to zip filezos.closeEntry();//Close resourceszos.close();fis.close();fos.close();System.out.println(file.getCanonicalPath()+" is zipped to "+zipFileName);} catch (IOException e) {e.printStackTrace();}}}

Output of the above java zip example program is:

上面的Java zip示例程序的输出为：

/Users/pankaj/sitemap.xml is zipped to /Users/pankaj/sitemap.zip
Zipping /Users/pankaj/tmp/.DS_Store
Zipping /Users/pankaj/tmp/data/data.dat
Zipping /Users/pankaj/tmp/data/data.xml
Zipping /Users/pankaj/tmp/data/xmls/project.xml
Zipping /Users/pankaj/tmp/data/xmls/web.xml
Zipping /Users/pankaj/tmp/data.Xml
Zipping /Users/pankaj/tmp/DB.xml
Zipping /Users/pankaj/tmp/item.XML
Zipping /Users/pankaj/tmp/item.xsd
Zipping /Users/pankaj/tmp/ms/data.txt
Zipping /Users/pankaj/tmp/ms/project.doc

Notice that while logging files to zip in directory, I am printing absolute path. But while adding zip entry, I am using relative path from the directory so that when we unzip it, it will create the same directory structure. That’s all for Java zip example.

请注意，在将文件记录到zip目录中的同时，我正在打印绝对路径。 但是，在添加zip条目时，我使用的是目录的相对路径，因此当我们将其解压缩时，它将创建相同的目录结构。 这就是Java zip示例的全部内容。

翻译自: https://www.journaldev.com/957/java-zip-file-folder-example

java zip 文件夹