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package common.utils;
import org.apache.commons.compress.compressors.CompressorOutputStream;
import org.apache.commons.compress.compressors.CompressorStreamFactory;
import org.apache.http.client.entity.GzipCompressingEntity;
import java.io.*;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/**
* 压缩工具类
*
* 该版本只支持.zip格式的压缩。
* Create by mulin on 2018/12/14.
*/
public class CompressUtil {
/**
* 文件压缩成ZIP文件
*
* @param zipPath 源文件的绝对路径，可以为文件或文件夹
* @param destPath 目标文件的绝对路径
* @throws Exception 解压失败
*/
public static void compressZip(String zipPath, String destPath) throws IOException {
CheckedOutputStream cos = null;
ZipOutputStream zos = null;
try {
File srcFile = new File(zipPath);
// 对目标文件做CRC32校验，确保压缩后的zip包含CRC32值
cos = new CheckedOutputStream(new FileOutputStream(destPath), new CRC32());
//装饰一层ZipOutputStream，使用zos写入的数据会被压缩
zos = new ZipOutputStream(cos);
zos.setLevel(9);//设置压缩级别 0-9,0表示不压缩，1表示压缩速度最快，9表示压缩后文件最小；默认为6，速率和空间上得到平衡。
if (srcFile.isFile()) {
compressZipFile("", srcFile, zos);
} else if (srcFile.isDirectory()) {
compressFolder("", srcFile, zos);
}
} finally {
IOUtil.closeQuietly(zos);
}
}
/**
* 压缩文件夹
*
* @param prefix
* @param srcFolder
* @param zos
* @throws IOException
*/
private static void compressFolder(String prefix, File srcFolder, ZipOutputStream zos) throws IOException {
String new_prefix = prefix + srcFolder.getName() + "/";
File[] files = srcFolder.listFiles();
//支持空文件夹
if (files.length == 0) {
compressZipFile(prefix, srcFolder, zos);
} else {
for (File file : files) {
if (file.isFile()) {
compressZipFile(new_prefix, file, zos);
} else if (file.isDirectory()) {
compressFolder(new_prefix, file, zos);
}
}
}
}
/**
* 压缩文件和空目录
*
* @param prefix
* @param src
* @param zos
* @throws IOException
*/
private static void compressZipFile(String prefix, File src, ZipOutputStream zos) throws IOException {
//若是文件,那肯定是对单个文件压缩
//ZipOutputStream在写入流之前，需要设置一个zipEntry
//注意这里传入参数为文件在zip压缩包中的路径，所以只需要传入文件名即可
String relativePath = prefix + src.getName();
if (src.isDirectory()) relativePath += "/"; //处理空文件夹
ZipEntry entry = new ZipEntry(relativePath);
//写到这个zipEntry中，可以理解为一个压缩文件
zos.putNextEntry(entry);
InputStream is = null;
try {
if (src.isFile()) {
is = new FileInputStream(src);
byte[] buffer = new byte[1024 << 3];
int len = 0;
while ((len = is.read(buffer)) != -1) {
zos.write(buffer, 0, len);
}
}
//该文件写入结束
zos.closeEntry();
} finally {
IOUtil.closeQuietly(is);
}
}
}