所需正文 [文件] 未指定 Micronaut 分段上传

Question

正在尝试使用声明性 HTTP 客户端上传文件，如下所示

Http 客户端

@Client("http://localhost:8080/product")
public interface IHttpClient {
    @Post(consumes = MediaType.MULTIPART_FORM_DATA, produces = MediaType.MULTIPART_FORM_DATA)
    public String post(@Body MultipartBody file);
}

对客户端的依赖注入

@Controller("/productManager")
public class ProductManagerController implements IProductOperation{
    private final IHttpClient iProduct;

    public ProductManagerController(IHttpClient iProduct) {
        this.iProduct = iProduct;
    }

    @Override
    public String post(CompletedFileUpload file) throws IOException {
        MultipartBody requestBody = MultipartBody.builder().addPart("file", file.getFilename(), MediaType.MULTIPART_FORM_DATA_TYPE, file.getBytes()).build();
        return this.iProduct.post(requestBody);
    }
}

产品负责人

@Controller("/product")
public class ProductController implements IProductOperation {
    @Post(consumes = MediaType.MULTIPART_FORM_DATA, produces = MediaType.MULTIPART_FORM_DATA)
    public String post(@Body MultipartBody file)  {
        return null;
    }
}

CURL

curl --location --request POST 'http://localhost:8080/productManager' \
--form 'file=@"/Users/macbook/Downloads/anand 001.jpg"'

我遇到了一个例外

02:32:24.519 [main] INFO  io.micronaut.runtime.Micronaut - Startup completed in 7442ms. Server Running: http://localhost:8080
02:32:33.985 [default-nioEventLoopGroup-1-4] DEBUG i.m.h.client.netty.DefaultHttpClient - Sending HTTP POST to http://localhost:8080/product
02:32:33.990 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - Accept: multipart/form-data
02:32:33.993 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - content-type: multipart/form-data; boundary=ac4442578cac3c2
02:32:33.994 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - transfer-encoding: chunked
02:32:33.994 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - host: localhost:8080
02:32:33.995 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - connection: close
02:32:35.260 [default-nioEventLoopGroup-1-4] DEBUG i.m.h.client.netty.DefaultHttpClient - Received response 400 from http://localhost:8080/product
02:32:35.260 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - Content-Type: application/json
02:32:35.260 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - content-length: 119
02:32:35.260 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - connection: close
02:32:35.260 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - Response Body
02:32:35.261 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - ----
02:32:35.261 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - {"message":"Required Body [file] not specified","path":"/file","_links":{"self":{"href":"/product","templated":false}}}
02:32:35.261 [default-nioEventLoopGroup-1-4] TRACE i.m.h.client.netty.DefaultHttpClient - ----
02:32:35.364 [default-nioEventLoopGroup-1-3] ERROR i.m.r.intercept.RecoveryInterceptor - Type [com.example.IProduct$Intercepted] executed with error: Required Body [file] not specified
io.micronaut.http.client.exceptions.HttpClientResponseException: Required Body [file] not specified
    at io.micronaut.http.client.netty.DefaultHttpClient.channelRead0(DefaultHttpClient.java:2140)
    at io.micronaut.http.client.netty.DefaultHttpClient.channelRead0(DefaultHttpClient.java:2055)
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
    at io.micronaut.http.netty.stream.HttpStreamsHandler.channelRead(HttpStreamsHandler.java:193)
    at io.micronaut.http.netty.stream.HttpStreamsClientHandler.channelRead(HttpStreamsClientHandler.java:183)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
    at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436)
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)
    at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
    at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
    at io.netty.util.concurrent.SingleThreadEventExecutor.run(SingleThreadEventExecutor.java:989)
    at io.netty.util.internal.ThreadExecutorMap.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:832)

Answer 1

您的实施过程中似乎存在不止一个问题，详情请见此处。

客户端和服务器 MultipartBody

post 遗漏了诊断错误最重要的部分，即 class imports。

当以编程方式构建 multipart 请求时，Micronaut 提供 io.micronaut.http.client.multipart.MultipartBody 类型来构建 multipart/form-data 个请求。请注意 MultipartBody 的 FQN (Fully-Qualified-Name)，它是 io.micronaut.http.client.* API.

的一部分

另一方面，@Controller 端点应使用相应的服务器类型：io.micronaut.http.server.multipart.MultipartBody。请注意 FQN，它是 io.micronaut.http.server.* API.

的一部分

客户端 HTTP Headers

在后台，生成的 Micronaut 客户端会将您的 @Client 方法注释转换为适当的 HTTP headers（Content-Type HTTP header 是这里感兴趣的一个）。那些 headers 显然应该与您的控制器端点预期匹配。

虽然简单的方法是为客户端和控制器使用相同的端点注释，但不幸的是这是错误的：@Client 和 @Controller 各自的方法必须 reversed produces 和 consumes 注释字段，以便：

客户端在发送请求时产生 控制器消耗然后
客户端消耗收到响应时控制器产生的

MIME 类型

在您的客户端和控制器实现中，您将返回一个 String。内容类型规范的端点注释字段应匹配返回的类型，即 java.lang.String 的 MediaTye.TEXT_PLAIN 而不是 MediaType.MULTIPART_FORM_DATA

固定实施

@Client 声明式界面应该如下所示（具有完整的 imports，固定的输入和结果 MIME 类型）：

import io.micronaut.http.MediaType;
import io.micronaut.http.annotation.Body;
import io.micronaut.http.annotation.Post;
import io.micronaut.http.client.annotation.Client;
import io.micronaut.http.client.multipart.MultipartBody;

@Client("http://localhost:8080/product")
public interface IHttpClient {
    @Post(consumes = MediaType.TEXT_PLAIN, produces = MediaType.MULTIPART_FORM_DATA)
    public String post(@Body MultipartBody file);
}

这里是 @Controller 端点实现（具有适当的 MultipartBody 和固定结果 MIME 类型）：

import io.micronaut.http.MediaType;
import io.micronaut.http.annotation.Body;
import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Post;
import io.micronaut.http.server.multipart.MultipartBody;

@Controller("/product")
public class ProductController implements IProductOperation {
    @Post(consumes = MediaType.MULTIPART_FORM_DATA, produces = MediaType.TEXT_PLAIN)
    public String post(@Body MultipartBody file)  {
        return null;
    }
}

所需正文 [文件] 未指定 Micronaut 分段上传

Required Body [file] not specified Micronaut Multipart upload

java

micronaut

micronaut-client

micronaut-rest

客户端和服务器 MultipartBody

客户端 HTTP Headers

MIME 类型

固定实施