Unsupported Media Type error in Jersey API

问题

I have seen multiple answers on stackoverflow and yet unable to identify what is wrong with my pom.xml. I have to upload files on the server, so I am using the modified code from FormDataMultiPart of this link

I have the code as:

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.media.multipart.ContentDisposition;
import org.glassfish.jersey.media.multipart.FormDataBodyPart;
import org.glassfish.jersey.media.multipart.FormDataMultiPart;

@Path("/files")
public class JerseyFileUpload {

private static final String SERVER_UPLOAD_LOCATION_FOLDER = "E:/Upload_Files/";

@POST
@Path("/upload")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(FormDataMultiPart form) {

     FormDataBodyPart filePart = form.getField("file");

     ContentDisposition headerOfFilePart =  filePart.getContentDisposition();

     InputStream fileInputStream = filePart.getValueAs(InputStream.class);

     String filePath = SERVER_UPLOAD_LOCATION_FOLDER + headerOfFilePart.getFileName();

    // save the file to the server
    saveFile(fileInputStream, filePath);

    String output = "File saved to server location using FormDataMultiPart : " + filePath;

    return Response.status(200).entity(output).build();

}

// save uploaded file to a defined location on the server
private void saveFile(InputStream uploadedInputStream, String serverLocation) {

    try {
        OutputStream outpuStream = new FileOutputStream(new File(
                serverLocation));
        int read = 0;
        byte[] bytes = new byte[1024];

        outpuStream = new FileOutputStream(new File(serverLocation));
        while ((read = uploadedInputStream.read(bytes)) != -1) {
            outpuStream.write(bytes, 0, read);
        }

        outpuStream.flush();
        outpuStream.close();

        uploadedInputStream.close();
    } catch (IOException e) {

        e.printStackTrace();
    }

}

 }

My pom.xlm is as

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>Photographer</groupId>
<artifactId>Assignment</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>Assignment</name>

<build>
    <finalName>Assignment</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.5.1</version>
            <inherited>true</inherited>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey</groupId>
            <artifactId>jersey-bom</artifactId>
            <version>${jersey.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet-core</artifactId>
        <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
        <!-- artifactId>jersey-container-servlet</artifactId -->
    </dependency>
    <!-- uncomment this to get JSON support-->
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-moxy</artifactId>
    </dependency>

   <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.18</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.media/jersey-media-multipart -->
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-multipart</artifactId>
        <version>2.25</version>
    </dependency>               

    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-server</artifactId>
    </dependency>

</dependencies>
<properties>
    <jersey.version>2.16</jersey.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

I am using Jersey Version 2.16, I am still getting "Unsupported Media Type", even though I am using the jersey-media-multipart version 2.25. Is there some issue due to the version? Or what is wrong with this pom.xml??

Thanks, would be grateful for any help.

回答1:

You still need to register the MultiPartFeature that comes with the jersey-media-multipart. The feature will register the providers needed to handle multipart requests. The error you're currently seeing is because there are no providers registered that can handle the FormDataMultiPart. See this post for a couple different ways of registering it

来源：https://stackoverflow.com/questions/43253206/unsupported-media-type-error-in-jersey-api