Java 解压 zip
程序员文章站
2022-05-15 12:53:31
...
package cn.jbolt.writefile;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
public class UnpackZip {
private static final int BUFFER_SIZE = 2 * 1024;
private static final String filePath = "F:\\demo.zip";
private static final String destDirPath = "F:\\demo";
public static void main(String[] args) throws Exception {
unZip(new File(filePath), destDirPath);
}
public static void unZip(File srcFile, String destDirPath) throws RuntimeException {
long start = System.currentTimeMillis(); // 判断源文件是否存在
if (!srcFile.exists()) {
throw new RuntimeException(srcFile.getPath() + "所指文件不存在");
}
// 开始解压
ZipFile zipFile = null;
try {
zipFile = new ZipFile(srcFile);
Enumeration<?> entries = zipFile.entries();
while (entries.hasMoreElements()) {
ZipEntry entry = (ZipEntry) entries.nextElement();
System.out.println("解压" + entry.getName());
// 如果是文件夹,就创建个文件夹
if (entry.isDirectory()) {
String dirPath = destDirPath + "/" + entry.getName();
File dir = new File(dirPath);
dir.mkdirs();
} else {
// 如果是文件,就先创建一个文件,然后用io流把内容copy过去
File targetFile = new File(destDirPath + "/" + entry.getName());
// 保证这个文件的父文件夹必须要存在
if (!targetFile.getParentFile().exists()) {
targetFile.getParentFile().mkdirs();
}
targetFile.createNewFile();
// 将压缩文件内容写入到这个文件中
InputStream is = zipFile.getInputStream(entry);
FileOutputStream fos = new FileOutputStream(targetFile);
int len;
byte[] buf = new byte[BUFFER_SIZE];
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
}
// 关流顺序,先打开的后关闭
fos.close();
is.close();
}
}
long end = System.currentTimeMillis();
System.out.println("解压完成,耗时:" + (end - start) + " ms");
} catch (Exception e) {
throw new RuntimeException("unzip error from ZipUtils", e);
} finally {
if (zipFile != null) {
try {
zipFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}