How to write a http get request when a key's value is an array?

Question

I have written a java servlet to deal with http get request.I know ,the common format of get request is like this:http://IP_ADDRESS:8080/test?name="jack"&value="shit.

But now ,I have a list of values to transfer,such as an user id list[1,2,3,4].So ,my question is ,how should I write my http get request to express this?And in java servets doGet(),can I use request.getParameterValues to get such an array?

Depending on what the list represents, it'd likely be better as JSON or XML in the body of the request. — Makoto, Dec 30 '13 at 07:12
The name of the field in the HTML form can be changed from `myfield` to `myfield[]` in order to make arrays possible. — Alexander van Oostenrijk, Dec 30 '13 at 07:14
You mean "http://ip:8080/test?name="jack"&value[]=[1,2,3,4]" ?@AlexvanOostenrijk — wuchang, Dec 30 '13 at 07:17
@Makoto if the request body is JSON or XML ,then the request type should be changed to post instead of get,right? — wuchang, Dec 30 '13 at 07:18

Yehia Awad · Answer 1 · 2013-12-30T08:41:10.563

if you are using GET method your url should be looking like that :

 http://IP_ADDRESS:8080/test?list=1&list=2&list=3

for retrieving it:

String[] arrlist=request.getParameterValues('list');

your array will be filled with separated values:

//["1","2","3"]

UPDATE : if to write it list[] or list?

when you retrieving your list parameters it wouldn't be parsed as array but as a series of String which will be grouped later on into an array. Which means even if you write it list[]=1&list[]=2&list[]=3, list[=1&list[=2&list[=3, list*=1&list*=2&list*=3 or list=1&list=2&list=3 it would always be giving you the same answer whether you retrieve it as

request.getParameterValues('list[]') //["1","2","3"]
request.getParameterValues('list[') //["1","2","3"]
request.getParameterValues('list*') //["1","2","3"]
request.getParameterValues('list')  //["1","2","3"]

score 0 · Answer 2 · answered Dec 30 '13 at 07:22

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While ,the http request format should be like this:localhost:8080/test?list[]=1&list[]=2&list[]=3

answered Dec 30 '13 at 07:22

wuchang

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you cannot do that ! unless you want your variable to be named as "list[]" look at my answer above – Yehia Awad Dec 30 '13 at 07:23
look at this page:http://stackoverflow.com/questions/3061273/send-an-array-with-an-http-get – wuchang Dec 30 '13 at 07:25
exactly like i have told you when you will be retrieving your list[] parameters it wouldn't be parsed as array but as a serie of String parameter which will be grouped later on into an array which mean even if you write it list[]=1&list[]=2&list[]=3 or list[=1&list[=2&list[=3 or list*=1&list*=2&list*=3 it would always give you the same answer if you retrieve it like that request.getParameterValues('list[]') request.getParameterValues('list[') request.getParameterValues('list*') – Yehia Awad Dec 30 '13 at 07:32

score 0 · Answer 3 · answered Dec 30 '13 at 08:47

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Maybe too simple, but what about repeat parameters name?

http://IP_ADDRESS:8080/test?userId=1&userId=2&userId=3

answered Dec 30 '13 at 08:47

Diego Martelli

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How to write a http get request when a key's value is an array?

3 Answers3