翻译为java代码 public FileContentResult ShowImg(int id) { var accessory = ProviderManager.GetProvider<AccessoryProviderBase>().FirstOrDefault<Accessory>(t => t.Id == id); var attachment = ProviderManager.GetProvider<AttachmentProviderBase>().FirstOrDefault<Attachment>(t => t.Id == accessory.AttachmentId); var path = Path.Combine(AttachmentProviderBase.FilePath, attachment.RelativePath); byte[] bytes = System.IO.File.ReadAllBytes(path); if (bytes != null) { return File(bytes, MediaTypeNames.Image.Jpeg); } return null; }

以下是 Java 代码的翻译，实现的功能与 C# 代码相同：

import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

@Controller
public class ImageController {

    @GetMapping("/image/{id}")
    @ResponseBody
    public StreamingResponseBody showImage(@PathVariable("id") int id) throws IOException {
        Accessory accessory = ProviderManager.getProvider(AccessoryProviderBase.class).findFirst(Accessory.class, t -> t.getId() == id);
        Attachment attachment = ProviderManager.getProvider(AttachmentProviderBase.class).findFirst(Attachment.class, t -> t.getId() == accessory.getAttachmentId());
        Path imagePath = Paths.get(AttachmentProviderBase.getFilePath(), attachment.getRelativePath());
        byte[] imageBytes = Files.readAllBytes(imagePath);
        return outputStream -> {
            outputStream.write(imageBytes);
            outputStream.flush();
        };
    }
}

需要注意的是，Java 代码中使用了 Spring MVC 框架和 Java 8 的 NIO API 实现了图片的读取和返回。同时，Java 代码中使用了 lambda 表达式作为查询条件，这是 Java 8 中新增的语法特性。