Java 如何在内存中提取zip文件

我读过很多关于在磁盘上提取zip文件的主题。但我有一个需要在内存中提取zip的用例。ZIP文件再次包含ZIP文件列表。在阅读了stack overflow中的几篇文章之后，我提出了这个问题。您能分享一些关于如何在内存中解压文件的帖子/链接吗？

java类java.util.zip.ZipInputStream允许您将zip归档文件中的数据读取到字节数组中。

java类java.util.zip.ZipInputStream允许您将zip归档文件中的数据读取到字节数组中。

要读取嵌套的.zip文件，可以尝试使用

ZipInputStream

（就像前面提到的那样），并检查

ZipEntry

（s）是否也是一个*.zip文件，在这种情况下，它可以作为下一个.zip文件递归读取。比如：

private static void readZipInputStream(
        InputStream inputStream, BiConsumer<ZipEntry, ByteArrayOutputStream> consumerFunction) throws IOException {

    try (ZipInputStream zipInput = new ZipInputStream(inputStream)) {
        ZipEntry entry;
        while ((entry = zipInput.getNextEntry()) != null) {
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int length;
            while ((length = zipInput.read(buffer)) != -1) {
                outStream.write(buffer, 0, length);
            }

            if (entry.getName().endsWith(".zip")) {
                // need to go deeper...
                ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray());
                readZipInputStream(inStream, consumerFunction);
            } else {
                // do something...
                consumerFunction.accept(entry, outStream);
            }
        }
    }
}

并使用如下

readZipInputStream

函数：

file.zip
├─1+2.zip
│ ├─1.zip
│ │ └─1.txt
│ └─2.zip
│   └─2.txt
└─3.zip
  └─3.txt

public class Application {

    public static void main(String[] args) throws IOException {
        String path = "file.zip";
        try (FileInputStream inputStream = new FileInputStream(Paths.get(path).toFile())) {
            readZipInputStream(
                    inputStream,
                    (entry, outputStream) -> {
                        System.out.println(entry.getName());
                        System.out.println("--------------------------------");
                        System.out.println(outputStream.toString());
                        System.out.println("--------------------------------");
                    }
            );
        }
    }
}

将打印三个.txt文件的内容：

1.txt
--------------------------------
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
consequat.
--------------------------------
2.txt
--------------------------------
- Integer vel sem consectetur, ullamcorper leo quis, consequat mauris.
- Nulla efficitur sapien at velit fermentum condimentum.
- Vestibulum elementum nulla ut ipsum tempus, ut molestie sem sollicitudin.
--------------------------------
3.txt
--------------------------------
Morbi tincidunt ornare mi. Sed id risus tortor. Interdum et malesuada 
fames ac ante ipsum primis in faucibus. Pellentesque tincidunt, 
nulla a interdum porta, orci elit ultricies leo, in maximus orci 
tortor pulvinar est. Curabitur eget fermentum risus. Vestibulum euismod 
convallis eros, nec blandit neque blandit at.
--------------------------------

---

如果要读取嵌套的.zip文件，可以尝试使用

ZipInputStream

（就像前面提到的那样），并检查

ZipEntry

（s）是否也是一个*.zip文件，在这种情况下，它可以作为下一个.zip文件递归读取。比如：

private static void readZipInputStream(
        InputStream inputStream, BiConsumer<ZipEntry, ByteArrayOutputStream> consumerFunction) throws IOException {

    try (ZipInputStream zipInput = new ZipInputStream(inputStream)) {
        ZipEntry entry;
        while ((entry = zipInput.getNextEntry()) != null) {
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int length;
            while ((length = zipInput.read(buffer)) != -1) {
                outStream.write(buffer, 0, length);
            }

            if (entry.getName().endsWith(".zip")) {
                // need to go deeper...
                ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray());
                readZipInputStream(inStream, consumerFunction);
            } else {
                // do something...
                consumerFunction.accept(entry, outStream);
            }
        }
    }
}

并使用如下

readZipInputStream

函数：

file.zip
├─1+2.zip
│ ├─1.zip
│ │ └─1.txt
│ └─2.zip
│   └─2.txt
└─3.zip
  └─3.txt

public class Application {

    public static void main(String[] args) throws IOException {
        String path = "file.zip";
        try (FileInputStream inputStream = new FileInputStream(Paths.get(path).toFile())) {
            readZipInputStream(
                    inputStream,
                    (entry, outputStream) -> {
                        System.out.println(entry.getName());
                        System.out.println("--------------------------------");
                        System.out.println(outputStream.toString());
                        System.out.println("--------------------------------");
                    }
            );
        }
    }
}

将打印三个.txt文件的内容：

1.txt
--------------------------------
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
consequat.
--------------------------------
2.txt
--------------------------------
- Integer vel sem consectetur, ullamcorper leo quis, consequat mauris.
- Nulla efficitur sapien at velit fermentum condimentum.
- Vestibulum elementum nulla ut ipsum tempus, ut molestie sem sollicitudin.
--------------------------------
3.txt
--------------------------------
Morbi tincidunt ornare mi. Sed id risus tortor. Interdum et malesuada 
fames ac ante ipsum primis in faucibus. Pellentesque tincidunt, 
nulla a interdum porta, orci elit ultricies leo, in maximus orci 
tortor pulvinar est. Curabitur eget fermentum risus. Vestibulum euismod 
convallis eros, nec blandit neque blandit at.
--------------------------------

---

将FileOutputStream替换为ByteArrayOutputStream以提取条目您了解看到的示例写入磁盘的原因吗？将FileOutputStream替换为ByteArrayOutputStream以提取条目您了解看到的示例写入磁盘的原因吗？