在java中使用SevenZip.openArchive方法后无法删除文件

Question

在我的端点中，我接收到格式为 Base64 的字符串形式的文件内容。 使用 SevenZip 库解压缩效果很好，没有任何问题。 但是执行完这行之后

archive = SevenZip.openInArchive(null, new RandomAccessFileInStream(
                        new RandomAccessFile(file, "r")));

java 由于以下异常而无法删除文件：

java.nio.file.FileSystemException: myFile.RAR: The process cannot access the file because it is being used by another process

我尝试过使用 junrar 库，但 SevenZip 效果更好（支持 RAR5 并识别损坏程度较低的文件作为 junrar）。

pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>demo</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>

        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding</artifactId>
            <version>16.02-2.01</version>
        </dependency>
        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding-all-platforms</artifactId>
            <version>16.02-2.01</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

这是 dto：

public record UploadDto(
        @NotNull
        String name,
        @NotNull
        String data) {
}

这是具有逻辑的控制器：

import net.sf.sevenzipjbinding.IInArchive;
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.SevenZipException;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.*;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Base64;

@RestController
public class TestController {
    private final Logger log = LoggerFactory.getLogger(TestController.class);

    @PostMapping("/upload")
    public void extractRar(@RequestBody UploadDto dto){
        byte[] decodedBytes = Base64.getDecoder().decode(dto.data());
        try {
            String filePath = dto.name();
            Files.write(Paths.get(filePath), decodedBytes);
            log.info("File saved successfully to: " + filePath);
            File file = new File(filePath);
            IInArchive archive;
            try {
                archive = SevenZip.openInArchive(null, new RandomAccessFileInStream(
                        new RandomAccessFile(file, "r")));
                log.info(String.valueOf(archive.getNumberOfItems()));
            } catch (SevenZipException | FileNotFoundException e) {
                throw new RuntimeException(e);
            }
            archive.close();

            // 1 method
            Files.delete(Path.of(filePath));

            // 2 method
            if (file.delete()) {
                log.info("file deleted successfully");
            } else {
                log.error("failed to delete the temporary file used for unzipping");
            }

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}

请求正文示例：

{
  "name": "myFile.RAR",
  "data": "UmFyIRoHAM+QcwAADQAAAAAAAABTL3QgkC8AFAAAABQAAAACTeXQiWmKL1cdMAoAIAAAAG15RmlsZS50eHQAsAA/PXJhciBkYXRhIG1vY2sgaGVyZQ0KxD17AEAHAA=="
}

我尝试了两种方法来删除该文件，但似乎都不起作用。 另外，我没有找到任何使用字节数组或 InputStream 打开Archive 的方法。 如果我可以在提取内容后删除文件或提取内容而不在本地保存文件，那么问题就可以解决。 任何帮助或想法将不胜感激！ 操作系统 Windows 10

Answer 1

网上找到的例子，关闭存档后关闭文件。

类似以下内容（根据您的需要，您可能需要单独尝试捕获 close() 调用）：

@PostMapping("/upload")
public void extractRar(@RequestBody UploadDto dto){
    byte[] decodedBytes = Base64.getDecoder().decode(dto.data());
    try {
        String filePath = dto.name();
        Files.write(Paths.get(filePath), decodedBytes);
        log.info("File saved successfully to: " + filePath);
        File file = new File(filePath);
        IInArchive archive;
        RandomAccessFile randomAccessFile;
        try {
            
            randomAccessFile = new RandomAccessFile(file, "r");
            archive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile));
            log.info(String.valueOf(archive.getNumberOfItems()));
        } catch (SevenZipException | FileNotFoundException e) {
            throw new RuntimeException(e);
        }
        archive.close();
        randomAccessFile.close();

        // 1 method
        Files.delete(Path.of(filePath));

        // 2 method
        if (file.delete()) {
            log.info("file deleted successfully");
        } else {
            log.error("failed to delete the temporary file used for unzipping");
        }

    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}