File.createTempFile 在 Java 中出现类型不兼容错误

Question

到目前为止，我的代码在临时目录中创建文件并进行处理时工作正常。

但现在我正在尝试提供我实际想要创建 xml 文件的特定目录。所以在方法 createTmpXmlFile

    private static Path createTmpXmlFile(final String prefix) {
        try {
            log.info("Creating temporary file {}{}", prefix, XML_SUFFIX);
            return Files.createTempFile(Paths.get(gleifZipFile), prefix, XML_SUFFIX);

        } catch (IOException e) {
            throw new IllegalStateException("Could not create tmp file at " + prefix + XML_SUFFIX + ". ", e);
        }
    }

我从

return Files.createTempFile(prefix, XML_SUFFIX);

至

return File.createTempFile(prefix, XML_SUFFIX, "/tmp/in");

我收到以下错误：

java: incompatible types: java.lang.String cannot be converted to java.io.File.

如果我在这里更改逻辑，那么它会影响调用 createTmpXmlFile 方法的其他方法。

我真的不明白如何解决这个问题。下面是我的代码：

@Slf4j
public class InputCS implements Runnable {

    public static final String XML_SUFFIX = ".xml";
    
    @Value("${gleifdataimporter.file.dir}")    
    private String gleifZipFile;

    private void processleifZipFile() {
        final AtomicBoolean isInsideLeiRecord = new AtomicBoolean();
        isInsideLeiRecord.set(false);
        final StringBuilder currentLeiRecordXml = new StringBuilder();

        try (FileSystem zipFs = FileSystems.newFileSystem(jobRunner.getInputZipPath(), null)) {
            Path tmpXMLPath = xmlFileFromLeiZipFile(zipFs);

            try (Stream<String> lines = Files.lines(tmpXMLPath)) {
                AtomicInteger processedLinesCounter = new AtomicInteger();
                AtomicInteger currentLineNumber = new AtomicInteger();
                lines.sequential().forEach(handleLineAndIncrementLineNumber(isInsideLeiRecord, currentLeiRecordXml, processedLinesCounter, currentLineNumber));
                log.info("{} lines of XML file inside LEIF input ZIP file {} processed.", processedLinesCounter.get(), jobRunner.getInputZipPath());
            }catch (IOException e) {
                throw new IllegalStateException("Problem reading input file at " + jobRunner.getInputZipPath() + ".", e);
            } finally {
                Files.delete(tmpXMLPath);
            }
        } catch (IOException e) {
            throw new IllegalStateException("Problem reading input file at " + jobRunner.getInputZipPath() + ".", e);
        }
    }

    private Path xmlFileFromLeiZipFile(FileSystem zipFs) {       //extracts the xml file from zip file
        log.info("Input file {} exists: {}", jobRunner.getInputZipPath(), Files.exists(jobRunner.getInputZipPath()));
        Path tmpXmlPath = createTmpXmlFile("leif__" + System.currentTimeMillis());
        for (Path rootDir : zipFs.getRootDirectories()) {
            try (Stream<Path> files = treeAt(rootDir)) {
                log.info("Trying to extract LEIF XML file from ZIP file into {}.", tmpXmlPath);
                final Path xmlFileInsideZip = files
                        .filter(isNotADir())
                        .filter(Files::isRegularFile)
                        .findFirst()
                        .orElseThrow(() -> new IllegalStateException("No file found in LEI ZIP file."));
                log.info("Path to LEIF XML file inside ZIP file: {}.", xmlFileInsideZip);
                return copyReplacing(xmlFileInsideZip, tmpXmlPath);
            }
        }
        throw new IllegalStateException("No file found in LEI ZIP file " + jobRunner.getInputZipPath() + ".");
    }
    

    private static Path createTmpXmlFile(final String prefix) {
        try {
            log.info("Creating temporary file {}{}", prefix, XML_SUFFIX);
            return Files.createTempFile(Paths.get(gleifZipFile), prefix, XML_SUFFIX);

        } catch (IOException e) {
            throw new IllegalStateException("Could not create tmp file at " + prefix + XML_SUFFIX + ". ", e);
        }
    }
    
    @NotNull
    private static Path copyReplacing(Path from, Path to) {
        requireNonNull(from, "Trying to copy from a path, which is null to path " + to + ".");   //trying to copy file where no xml file exist in root directory
        requireNonNull(to, "Trying to copy from path " + from + " to a path, which is null.");
        try {
            return Files.copy(from, to, REPLACE_EXISTING);
        } catch (IOException e) {
            throw new IllegalStateException("Cannot copy from " + from + " to " + to + ". ", e);
        }
    }
    
}

Answer 1

File.createTempFile 期望 File 对象作为第三个参数。只需将 "/tmp/in" 包装到一个文件中 => return File.createTempFile(prefix, XML_SUFFIX, new File("/tmp/in")); 你应该可以开始了。

所以你可以这样做：

File.createTempFile("prefix", "suffix", new File("/tmp/in"));

或者使用NIO（推荐）

Files.createTempFile(Paths.get("/tmp/in"), "prefix", "suffix");

Answer 2

根据 Slaw 的建议，使用 Files#createTempFile(Path,String,String,FileAttribute...) 指定创建临时文件的目录。
使用Paths#get(String,String...) for java 7 or 8, or Path#of(String,String...) for java 11 or later to convert String to Path. Further reading:

private static Path createTmpXmlFile(final String prefix) {
    try {
        // Java 11 or later
        // return Files.createTempFile(Path.of("/tmp/in"), prefix, XML_SUFFIX);
        // Java 8
        return Files.createTempFile(Paths.get("/tmp/in"), prefix, XML_SUFFIX);
    } catch (IOException e) {
        throw new IllegalStateException("Could not create tmp file at " + prefix + XML_SUFFIX + ". ", e);
    }
}

File.createTempFile 在 Java 中出现类型不兼容错误

File.createTempFile in Java getting Incompatible type error

java

file-handling

incompatibletypeerror

createfile