如何将HashSet传递给服务器以测试邮递员的API？

Question

I created an API which I want to test using postman. My api is accepting many parameters and one parameter is HAshSet. I dont know how to pass HashSet parameter using postman. Please help me. Thanks in advance

Here is my code:

@PutMapping
    @ApiOperation(value = "collectMultiInvoices", nickname = "collectMultiInvoices")
    public BaseResponse collectAmountMultipleInvoices(@RequestParam(value = "invoice_id") HashSet<Integer> invoiceIds,
                                      @RequestParam("date") String _date,
                                      @RequestParam(value = "cash", required = false) Float cashAmount,
                                      @RequestParam(value = "chequeAmount", required = false) Float chequeAmount,
                                      @RequestParam(value = "chequeNumber", required = false) String chequeNumber,
                                      @RequestParam(value = "chequeDate", required = false) String _chequeDate,
                                      @RequestParam(value = "chequeImage", required = false) MultipartFile chequeImage,
                                      @RequestParam(value = "chequeBankName", required = false) String chequeBankName,
                                      @RequestParam(value = "chequeBankBranch", required = false) String chequeBankBranch,
                                      @RequestParam(value = "otherPaymentAmount", required = false) Float otherPaymentAmount,
                                      @RequestParam(value = "otherPaymentType", required = false) Integer otherPaymentType,
                                      @RequestParam(value = "otherPaymentTransactionId", required = false) String otherPaymentTransactionId,
                                      @RequestParam(value = "discountPercentorAmount", required = false) String discountPercentorAmount,
                                      @RequestParam(value = "discountId", required = false) String discountId) throws AppException.RequestFieldError, AppException.CollectionAmountMoreThanOutstanding {


//method implementation

}

Answer 1

A Set or HashSet is a java concept. There is no such thing as a Set from the HTTP perspective, and there is no such thing as a Set in Postman. So from Postman, you need to send the invoice_ids in a format that Spring's parsing library can convert to a HashSet . As @Michael pointed out in the comments, one way to do this is to comma separate the invoice_id s like this: invoice_id=id1,id2,id3 . When Spring processes this request, it will see that you are expecting data in the form of a HashSet , so it will attempt to convert id1,id2,id3 into a HashSet<Integer> , which it knows how to do automatically.

Side note: Unless you specifically need a HashSet , it is considered good practice to declare your type using the interface instead of an implementing subclass. So in this situation I would recommend changing your method signature to accept a Set<Integer> instead of a HashSet<Integer>