public function encodeParameters(parameters:Pair[]):String in Java

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public function encodeParameters(parameters:Pair[]):String
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Forms can also be submitted using a GET operation We cover this at the end of this section
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Each name/value pair is represented as an instance of the javafxdataPair class, which holds both the name and the associated valueThe result of the function call is the previous encoded string The code that creates and submits the POST request can be found in the file javafxdata/HttpRequestExample6fx here s an extract that shows the important detailsAs before, when creating the HttpRequest object, we install triggers and callback functions that report the progress of the request as it is executed, but we do not show those details here:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 function doRequest(url:String) { var params = [ Pair { name: "param1" value: "value #1" }, Pair { name: "param2" value: "value #2" }, ]; var converter = URLConverter {}; var postData = converterencodeParameters(params); addText("Encoded data: "); var bytes = postDatagetBytes("UTF-8"); r = HttpRequest { location: url method: HttpRequestPOST source: new ByteArrayInputStream(bytes); headers: [ HttpHeader { name: HttpHeaderCONTENT_TYPE value: "application/x-www-form-urlencoded" }, HttpHeader { name: HttpHeaderCONTENT_LENGTH value: "{byteslength}" }, HttpHeader { name: HttpHeaderCONTENT_ENCODING value: "UTF-8" }, ] // Code omitted } rstart(); }
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The code on lines 2 to 5 creates the name/value pairs for the form by using Pair objects On lines 6 and 7, we create a URLConverter instance and invoke its encodeParameters() function to apply the URL encoding to the form parameters to produce the representation required for the request body On line 9, we convert the parameter string to bytes in the UTF-8 encoding The HttpRequest is almost identical to the one in the PUT example shown earlier in this chapterThe only differences are the method, which is HttpRequestPOST in this case,
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The HttpRequest Class
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and the content type header, which is application/x-www-form-urlencodedThis special value indicates that the URL encoding rules described above have been used to encode the data in the body of the requestThat data is passed to the HttpRequest in form of a ByteArrayInputStream assigned to the source variable If you run this code and use the same URL as the one in the PUT example in the previous section, you will see the result of the operation in the usual place in the user interfaceWhen it receives a POST request, the servlet reads the parameter/value pairs and values from the body and returns them as part of the response code, separated by vertical bars, to demonstrate that they have been correctly encoded Here s an extract from the output that shows the servlet s response:
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responseCode -> 200 onResponseCode: 200 responseMessage -> param1=value #1|param2=value #2| onResponseMessage: param1=value #1|param2=value #2|
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Form data can also be submitted by using a GET request In this case, the request body would be empty and the URL encoded form data is appended to the rest of the URL and separated from it by a character, like this:
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http://host/servletpath param1=value+%231¶m2=value+%232
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As it name suggests, the HTTP DELETE operation is used to request the removal of the resource identified by the target URL In terms of the HttpRequest class, the resource to be removed is specified by the location variable, and the method variable is set to HttpRequestDELETEThe following code extract, from the file javafxdata/HttpRequestExample7fx, shows how to create and perform a DELETE request:
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function doRequest(url:String) { r = HttpRequest { location: url method: HttpRequestDELETE // Code to add triggers and callback functions omitted } rstart(); }
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Running this example and entering the same URL as that used in the PUT and POST examples earlier causes the servlet to respond with a message that indicates that the DELETE request was understood (although the example servlet does not actually delete anything):
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