Java实现gz压缩与解压缩
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Java 实现 gz 压缩与解压缩
压缩
/**
* 将指定文件GZ压缩,并删除原文件。
*/
public static void gzip(String fileName) throws Exception {
String outFileName = fileName + ".gz";
GZIPOutputStream out = new GZIPOutputStream(new FileOutputStream(outFileName));
FileInputStream in = new FileInputStream(fileName);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.finish();
out.close();
new File(fileName).delete();
}
解压缩
/**
* 将指定GZ文件解压缩,并删除原文件。
*/
public static void gunzip(String gzFileName) throws Exception {
String outFileName = gzFileName.substring(0, gzFileName.length() - 3);
// 文本文件输出流
FileOutputStream fileOutput = new FileOutputStream(outFileName);
GZIPInputStream gzFileInput = new GZIPInputStream(new FileInputStream(gzFileName));
byte[] buf = new byte[1024];
int len;
while ((len = gzFileInput.read(buf)) > 0) {
fileOutput.write(buf, 0, len);
}
gzFileInput.close();
fileOutput.close();
new File(gzFileName).delete();
}
调用示例
public static void main(String[] args) {
String filename = "/xxx/xxx/xxx.txt";
try {
// gzip压缩文件
GzipUtils.gzip(filename);
// gunzip解压文件
GzipUtils.gunzip(filename + ".gz");
} catch (Exception e) {
e.printStackTrace();
}
}