java - CXF "No Message body reader found"用于 POST 服务中的字节数组参数

Question

我正在尝试编写一个服务，该服务负责通过将文件作为 POST 实体中的字节数组来上传文件。这是我的代码

我的 CXF 服务

@Path("MyTest")
public class TestService {
    @POST
    public String MyPost(Byte[] bytes){
        System.out.println("Service invoked");
        return "Hello, I am a POST response";
    }
}

我的客户

File image = new File("C:\\snake.jpg");
FileInputStream is = new FileInputStream(image);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] fileInBytes = bos.toByteArray();

Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:8080/MyApp");
target = target.path("MyTest");
Response response = target.request().post(Entity.entity(fileInBytes, MediaType.APPLICATION_OCTET_STREAM));

InputStream i = (InputStream) response.getEntity();
BufferedReader br = new BufferedReader(new InputStreamReader(i));
System.out.println(br.readLine());

这是我得到的错误

SEVERE: No message body reader has been found for class [Ljava.lang.Byte;, ContentType: application/octet-stream
Nov 06, 2014 4:02:50 PM org.apache.cxf.jaxrs.impl.WebApplicationExceptionMapper toResponse
WARNING: javax.ws.rs.WebApplicationException: HTTP 415 Unsupported Media Type
    at org.apache.cxf.jaxrs.utils.JAXRSUtils.readFromMessageBody(JAXRSUtils.java:1298)
...

有什么想法吗？有没有更好的方法来做文件上传服务？

谢谢

Answer 1

您可以使用InputStream

@POST
public String MyPost(InputStream is) throws IOException  {
    BufferedImage image = ImageIO.read(is);
    JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(image)));
    System.out.println("Service invoked");
    return "Hello, I am a POST response";
}

此外，在您的客户端代码中，您实际上并未向输出流写入任何内容。应该更像一些

FileInputStream is = new FileInputStream(image);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();

int nRead;
byte[] data = new byte[16384];
while ((nRead = is.read(data, 0, data.length)) != -1) {
    buffer.write(data, 0, nRead);
}
buffer.flush();
byte[] fileInBytes = buffer.toByteArray();

Response response = target.request().post(Entity.entity(fileInBytes, 
        MediaType.APPLICATION_OCTET_STREAM));

---

更新

您可以实际使用字节数组。你只需要使用原始的 byte[]

@POST
public String MyPost(byte[] bytes) throws IOException  {
    JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(bytes)));
    System.out.println("Service invoked");
    return "Hello, I am a POST response";
}

---

甚至可以使用 File

@POST
public String MyPost(File file) throws IOException  {
    BufferedImage image = ImageIO.read(file);
    JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(image)));
    System.out.println("Service invoked");
    return "Hello, I am a POST response";
}

JAX-RS 在磁盘上创建一个用于输入的临时文件。它从网络缓冲区读取并将读取的字节保存到这个临时文件中。

它们都有效。选择你的毒药