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java压缩文件

程序员文章站 2022-05-15 12:41:44
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package org.liufei.net.util;

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.Enumeration;

import org.apache.log4j.Logger;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;

/**
*
* @author 刘飞
*
*/
public class JavaZip {
private static final Logger logger = Logger.getLogger(JavaZip.class);

/**
* 压缩文件file成zip文件zipFile
*
* @param file
* 要压缩的文件
* @param zipFile
* 压缩文件存放地方
* @throws IOException
*/

public static void zip(File file, File zipFile) {

ZipOutputStream output = null;
try {
output = new ZipOutputStream(new FileOutputStream(zipFile));
/**
* 顶层目录开始
*/
zipFile(output, file, "");
} catch (IOException ex) {
logger.error("zip file [ " + file + " ] error.", ex);
throw new RuntimeException("zip file [ " + file + " ] error.", ex);
} finally {
try {
/**
* 关闭流
*/
if (output != null) {
output.flush();
output.close();
}
} catch (IOException e) {
logger.error("close ZipOutputStream [ file : " + zipFile
+ " ] error.", e);
throw new RuntimeException("zip file [ " + zipFile
+ " ] error.", e);
}
}
}

/**
* 压缩文件为zip格式
*
* @param output
* ZipOutputStream对象
* @param file
* 要压缩的文件或文件夹
* @param basePath
* 条目根目录
* @throws IOException
*/
private static void zipFile(ZipOutputStream output, File file,
String basePath) throws IOException {
FileInputStream input = null;
try {
/**
* 文件为目录
*/
if (file.isDirectory()) {
/**
* 得到当前目录里面的文件列表
*/
File list[] = file.listFiles();
basePath = basePath + (basePath.length() == 0 ? "" : "/")
+ file.getName();
/**
* 循环递归压缩每个文件
*/
for (File f : list)
zipFile(output, f, basePath);
} else {
/**
* 压缩文件
*/
basePath = (basePath.length() == 0 ? "" : basePath + "/")
+ file.getName();
output.putNextEntry(new ZipEntry(basePath));
input = new FileInputStream(file);
int readLen = 0;
byte[] buffer = new byte[1024 * 8];
while ((readLen = input.read(buffer, 0, 1024 * 8)) != -1)
output.write(buffer, 0, readLen);
}
} catch (Exception ex) {
logger.error("zip file [ " + file + " ] error.", ex);
throw new RuntimeException("zip file [ " + file + " ] error.", ex);
} finally {
/**
* 关闭流
*/
if (input != null)
input.close();
}
}

/**
* 解压zip文件
*
* @param zip
* zip文件绝对路径
* @param unZipDir
* 解压到的目录
* @throws IOException
*/
public static void unZip(String zip, String unZipDir) throws IOException {
unZip(new File(zip), new File(unZipDir)) ;
}

/**
* 解压zip文件
*
* @param zip
* zip文件
* @param unZipDir
* 解压到的目录文件
* @throws IOException
*/
@SuppressWarnings("unchecked")
public static void unZip(File zip, File unZipDir) throws IOException {
ZipFile zipFile = new ZipFile(zip, "GBK");

byte[] buffer = new byte[2048];
int length = -1;

OutputStream out = null;
InputStream in = null;

Enumeration<ZipEntry> zee = zipFile.getEntries();
while (zee.hasMoreElements()) {
ZipEntry zipEntry = zee.nextElement();
File loadFile = new File(unZipDir, zipEntry.getName());

if (zipEntry.isDirectory()) {
loadFile.mkdirs();
} else {
if (!loadFile.getParentFile().exists()) {
loadFile.getParentFile().mkdirs();
}
out = new FileOutputStream(loadFile, false);

in = zipFile.getInputStream(zipEntry);

while ((length = in.read(buffer)) > 0) {
out.write(buffer, 0, length);
}
}
}

if (in != null) {
in.close();
}
if (out != null) {
out.flush();
out.close();
}
}
}
相关标签: java zip