创建 JAX-RS 提供程序以从 InputStream 创建 Java 映像

发布于 2024-11-03 09:55:36 字数 1599 浏览 5 评论 0原文

我正在尝试创建一个 image/jpeg jax-rs 提供程序类,为我的基于休息后的 Web 服务创建图像。我无法制定请求来测试以下内容,测试这个的最简单方法是什么?

 @POST
 @Path("/upload")
 @Consumes("image/jpeg")
 public Response createImage(Image image)
 {
    image.toString(); //temp code here just to see if service gets hit
    return null;
 }

import java.awt.Image;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.imageio.ImageIO;
import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import org.springframework.stereotype.Component;


@Provider
@Consumes("image/jpeg")
@Component("ImageProvider")  //spring way to register resource
class ImageProvider implements MessageBodyReader<Image> {

    public Image readFrom(Class<Image> type,
                                Type genericType,
                                Annotation[] annotations,
                                MediaType mediaType,
                                MultivaluedMap<String, String> httpHeaders,
                                InputStream entityStream) throws IOException,
        WebApplicationException {
        Image originalImage = ImageIO.read(entityStream);
        return originalImage;
    }

    public boolean isReadable(Class<?> arg0, Type arg1, Annotation[] arg2, MediaType arg3) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}

I'm trying to create an image/jpeg jax-rs provider class that creates an Image for my post rest based web service. I'm unable to formulate the request in order to test the below, what is easiest way to test this?

 @POST
 @Path("/upload")
 @Consumes("image/jpeg")
 public Response createImage(Image image)
 {
    image.toString(); //temp code here just to see if service gets hit
    return null;
 }

import java.awt.Image;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.imageio.ImageIO;
import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import org.springframework.stereotype.Component;


@Provider
@Consumes("image/jpeg")
@Component("ImageProvider")  //spring way to register resource
class ImageProvider implements MessageBodyReader<Image> {

    public Image readFrom(Class<Image> type,
                                Type genericType,
                                Annotation[] annotations,
                                MediaType mediaType,
                                MultivaluedMap<String, String> httpHeaders,
                                InputStream entityStream) throws IOException,
        WebApplicationException {
        Image originalImage = ImageIO.read(entityStream);
        return originalImage;
    }

    public boolean isReadable(Class<?> arg0, Type arg1, Annotation[] arg2, MediaType arg3) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}

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黒涩兲箜 2024-11-10 09:55:36

如果您的提供程序也实现了 MessageBodyWriter,您可以使用客户端库(例如 Wink 客户端)使用相同的提供程序发送图像:

Wink 的示例代码:

ClientConfig config = new ClientConfig();
Application application = // create application that contains ImageProvider 
config.applications(application);
RestClient restClient = new RestClient(config);
URI uri = // uri to server
Image image = // create image
restClient.resource(uri).contentType("image/jpeg").post(image);

顺便说一句,您的提供程序中有一个错误:您必须实现 isReadable 方法,因此它将返回 true正确的媒体类型和类别。

If your provider implements also MessageBodyWriter, you can use a client library (e.g. Wink Client) and use the same provider to sennd the image:

Sample code with Wink:

ClientConfig config = new ClientConfig();
Application application = // create application that contains ImageProvider 
config.applications(application);
RestClient restClient = new RestClient(config);
URI uri = // uri to server
Image image = // create image
restClient.resource(uri).contentType("image/jpeg").post(image);

Btw, there is a bug in your provider: you MUST implement isReadable method, so it will return true for the correct media type and class.

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