Extract multiple JSON strings from multipart HTTP response

Question

I'm using Apache HttpClient to work with a web service that returns a multipart/form-data response which contains json.

I'm having a very hard time extracting each JSON string separately so I can read the json string.

I did read similar posts on Stackoverflow, and some suggested using Apache commons fileupload, but I am not sure how that can separate the JSON strings from the whole response that has a bunch of other text such as the boundary string, content type, etc

The response looks something like below.

--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: GetMailboxes
Status-Code: 200
X-Server-Response-Time: 4ms
X-Server-Chain: domain.com
Content-RequestDuration: 5

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: GetFolders
Status-Code: 200
X-Server-Response-Time: 8ms
X-Server-Chain: domain.com
Content-RequestDuration: 10

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: GetAlerts
Status-Code: 200
X-Server-Response-Time: 10ms
X-Server-Chain: domain.com
Content-RequestDuration: 12

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: GetAccounts
Status-Code: 200
X-Server-Response-Time: 11ms
X-Server-Chain: domain.com
Content-RequestDuration: 12

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: GetAllSavedSearches
Status-Code: 200
X-Server-Response-Time: 10ms
X-Server-Chain: domain.com
Content-RequestDuration: 12

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: GetAthenaSegment
Status-Code: 200
X-Server-Response-Time: 14ms
Content-RequestDuration: 21

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: ListFolderThreads
Status-Code: 200
X-Server-Response-Time: 110ms
Content-RequestDuration: 116

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-Type: application/json
Content-RequestId: GetUserInfo
Status-Code: 200
X-Server-Response-Time: 197ms
Content-RequestDuration: 204

{JSON}
--Boundary_16003419_2104021487_1483424496169
Content-RequestId: Status
Content-Type: application/json

{JSON}
--Boundary_16003419_2104021487_1483424496169--

Any way to do this reliably?

Answer 1

One option would be Apache Mime4j. You would likely want to use MimeTokenStream or MimeStreamParser as described here if you want your application to handle response content without building a complete DOM tree in memory.