How to Upload Files and Accompanying Data Simultaneously in a Jersey RESTful Web Service?

File Upload with Accompanying Data in Jersey RESTful Web Service

When creating employees in a system, you may wish to include an image along with their personal information. While it is possible to accomplish this with separate REST calls, it is more efficient to do so with a single call. This article provides a solution to this problem, allowing you to receive both the file and employee data simultaneously.

To achieve this, modify the Java method as follows:

@POST
@Path("/upload2")
@Consumes({MediaType.MULTIPART_FORM_DATA})
public Response uploadFileWithData(
        @FormDataParam("file") InputStream fileInputStream,
        @FormDataParam("file") FormDataContentDisposition contentDispositionHeader,
        @FormDataParam("emp") Employee emp) {

    // ..... business login
}

In the JSON structure, the employee data is now a part of the multipart request:

{
    "emp": {
        "Name": "John",
        "Age": 23,
        "Email": "[email protected]",
        "Adrs": {
            "DoorNo": "12-A",
            "Street": "Street-11",
            "City": "Bangalore",
            "Country": "Karnataka"
        }
    }
}

Additional Considerations

• Jersey does not allow multiple Content-Types within a single request.
• Some clients may not support setting Content-Types for individual body parts (e.g., Postman and the browser when using FormData).
• To address this, explicitly set the Content-Type before deserializing the JSON data:

jsonPart.setMediaType(MediaType.APPLICATION_JSON_TYPE);
Employee emp = jsonPart.getValueAs(Employee.class);

• Alternatively, you can use a String parameter and deserialize the JSON using a library like Jackson ObjectMapper.

By following these steps, you can successfully upload a file and the accompanying employee data in a single REST call using Jersey.

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