上传Restful Web Service java. png文件

Question

我尝试为我的web服务编写一个图像文件上传post方法。这是我的post方法。图片文件可以通过post方式上传，但不能转换为图片类型。

@POST
@Path("/upload")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces("text/html")
public Response uploadFile(@FormDataParam("file") File file2) throws IOException {
    InputStream IS = null;
    String output = "";
    try {
        IS = new FileInputStream(file2);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {
    }

    try {
        if (file2 != null && IS != null) {
            Image img = ImageIO.read(IS);
            if (img != null) {
                output = "image file transmission sucessed";
            } else {
                String out = convertStreamToString(IS);
                output = "file uploaded into post method, however can not transfer it into image type "+
                "n"+ out;
            }
        } else if (file2 == null) {
            output = "the file uploaded into post method is null";
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return Response.status(200).entity(output).build();
}
static String convertStreamToString(java.io.InputStream is) {
    java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\A");
    return s.hasNext() ? s.next() : "";
}

使用"上传文件到post"的方法，但是不能将其转换为图像类型+"n"+ out;显示消息。我认为原因是inputStream包含外部文件信息+图像的内容。当我尝试将inputStream转换回Image时，我需要找到一种方法来摆脱传递的额外信息。

这是我的新版本:

@POST
@Path("/images")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response imageUpload(
        @FormDataParam("image") InputStream hereIsImage,
        @FormDataParam("image") FormDataContentDisposition hereIsName) {
    String path = "f://";
    if (hereIsName.getSize() == 0) {
        return Response.status(500).entity("image parameter is missing")
                .build();
    }
    String name = hereIsName.getFileName();
    path += name;
    try {
        OutputStream out = new FileOutputStream(new File(path));
        int read;
        byte[] bytes = new byte[1024];
        while ((read = hereIsImage.read(bytes)) != -1) {
            out.write(bytes, 0, read);
        }
        out.flush();
        out.close();
    } catch (IOException e) {
        return Response.status(500)
                .entity(name + " was not uploadedn" + e.getMessage())
                .build();
    }
    return Response.status(200).entity(name + " was uploaded").build();
}

但是，当我上传图像时，弹出错误:

[ERROR]在处理au.edu.rmit.srtwebservice.util.rest.testWS类时发生异常。这个类被忽略。com/sun/jersey/core/header/FormDataContentDisposition

testWS。

Answer 1

public Response uploadFile(@FormDataParam("file") File file2)

File输入可能不工作，因为您最有可能从您的客户端发送一个八字节流。所以尝试使用InputStream作为输入类型，希望它应该工作。

public Response uploadFile(@FormDataParam("file") InputStream file2)