java - 使用 gzip 格式的缓冲区解压缩图像失败

Question

我正在使用 压缩文件，但在解压缩它们时，我遇到了两个问题，

1. 当在没有缓冲区的情况下解压缩时，它会恢复到原始形式，但是当我使用缓冲区时，它无法正确完成。

2. 解压文件的大小大于原始文件。

private static void writeFile(FileOutputStream fos, String zipFilePath) throws IOException {
        try (FileInputStream fis = new FileInputStream(zipFilePath);
                GZIPInputStream inflaterInputStream = new GZIPInputStream(fis)) {
            int data;
            **while ((data = inflaterInputStream.read()) != -1) {//without buffer**
                fos.write(data);
            }
        }
    }

private static void writeFile(FileOutputStream fos, String zipFilePath) throws IOException {
        byte[] buffer = new byte[12048];
        try (FileInputStream fis = new FileInputStream(zipFilePath);
                GZIPInputStream inflaterInputStream = new GZIPInputStream(fis)) {
            int data;
            **while ((data = inflaterInputStream.read(buffer)) != -1) {//with buffer**
                fos.write(data);
            }
        }
    }

Answer 1

你写的不是buffer，而是data，它是读取字节的长度...

更正:

private static void writeFile(FileOutputStream fos, String zipFilePath) throws IOException {
    byte[] buffer = new byte[12048];
    try (InputStream fis = new FileInputStream(zipFilePath);
         InputStream inflaterInputStream = new GZIPInputStream(fis)) {
         int data;
         while ((data = inflaterInputStream.read(buffer)) != -1) {//with buffer**
             fos.write(buffer, 0, data);
         }
    }
}

你最好使用 apache.commons-io

private static void writeFile(FileOutputStream fos, String zipFilePath) throws IOException {
    try (InputStream fis = new FileInputStream(zipFilePath);
         InputStream inflaterInputStream = new GZIPInputStream(fis)) {
        IOUtils.copy(fis, fos);
    }
}