Question

我正在尝试使用java.nio-API遍历.zip文件，但在尝试调用ProviderNotFoundException时收到FileSystems.newFileSystem。

我也尝试将zip:file:更改为jar:file:，但除了消息显示Provider "jar" not found之外，我得到了同样的异常。

我还尝试过直接使用FileSystems.newFileSystem(Path, null)，而不首先创建URI。

输出：

Reading zip-file: /home/pyknic/Downloads/Walking.zip
Exception in thread "main" java.nio.file.ProviderNotFoundException: Provider "zip" not found
    at java.base/java.nio.file.FileSystems.newFileSystem(FileSystems.java:364)
    at java.base/java.nio.file.FileSystems.newFileSystem(FileSystems.java:293)
    at com.github.pyknic.zipfs.Main.main(Main.java:19)

Main.java

package com.github.pyknic.zipfs;

import java.io.IOException;
import java.net.URI;
import java.nio.file.*;
import java.util.stream.StreamSupport;

import static java.lang.String.format;
import static java.util.Collections.singletonMap;

public class Main {

    public static void main(String... args) {
        final Path zipFile = Paths.get(args[0]);

        System.out.println("Reading zip-file: " + zipFile);
        final URI uri = URI.create("zip:file:" + zipFile.toUri().getPath().replace(" ", "%20"));

        try (final FileSystem fs = FileSystems.newFileSystem(uri, singletonMap("create", "true"))) {
            final long entriesRead = StreamSupport.stream(fs.getRootDirectories().spliterator(), false)
                .flatMap(root -> {
                    try {
                        return Files.walk(root);
                    } catch (final IOException ex) {
                        throw new RuntimeException(format(
                            "Error traversing zip file system '%s', root: '%s'.",
                            zipFile, root), ex);
                    }
                }).mapToLong(file -> {
                    try {
                        Files.lines(file).forEachOrdered(System.out::println);
                        return 1;
                    } catch (final IOException ex) {
                        throw new RuntimeException(format(
                            "Error modifying DAE-file '%s' in zip file system '%s'.",
                            file, zipFile), ex);
                    }
                }).sum();

            System.out.format("A total of %,d entries read.%n", entriesRead);

        } catch (final IOException ex) {
            throw new RuntimeException(format(
                "Error reading zip-file '%s'.", zipFile
            ), ex);
        }
    }
}

如何使用Java Nio-API访问zip文件的文件系统？

java.nio.file.ProviderNotFoundException：找不到提供程序“zip”

0 个答案: