java – 如何在rest api jersey中获取文件大小

2024年1月1日 317次阅读

我已经做了一个休息api它工作正常,但我想读取文件的大小,我用下面的代码来读取文件的大小

@POST
@Path("/test")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response upload( FormDataMultiPart form ){
    System.out.println(" size of file="+ filePart.getContentDisposition().getSize());
}

但我得到文件-1的大小.

任何人都可以建议我如何阅读文件的实际大小.

但是使用

System.out.println(" data name ="+ filePart.getContentDisposition().getFileName());

我得到了正确的文件名.

最佳答案 希望这是你想要的.我已在我的系统中验证过它.这将以字节为单位打印文件的大小.

@POST
@Path("/upload")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(@FormDataParam("file") InputStream uploadedInputStream, @FormDataParam("file") FormDataContentDisposition fileDetail) {

    String uploadedFileLocation = "/home/Desktop/" + fileDetail.getFileName();
    // save it
    writeToFile(uploadedInputStream, uploadedFileLocation);
    File file = new File(uploadedFileLocation);
    System.out.println(file.length() + " in bytes");
    String output = "File uploaded to : " + uploadedFileLocation;
    return Response.status(200).entity(output).build();
}

// save uploaded file to new location
private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation) {

    try {
        OutputStream out = new FileOutputStream(new File(uploadedFileLocation));
        int read = 0;
        byte[] bytes = new byte[1024];
        out = new FileOutputStream(new File(uploadedFileLocation));
        while ((read = uploadedInputStream.read(bytes)) != -1) {
            out.write(bytes, 0, read);
        }
        out.flush();
        out.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

确保你的pom.xml中有以下依赖项

<dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-multipart</artifactId>
        <version>2.13</version>
</dependency>

还将此添加到扩展资源配置的应用程序类中.这将您的课程注册为具有多部分内容的球衣.

super(YourClass.class, MultiPartFeature.class);
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