How to read JSON object from URL query string

Question

I have a URL request like this:

http://localhost:8080:_dc=1367504213107&filter[0][field]=site&filter[0][data][type]=string&filter[0][data][value]=test&filter[1][field]=address&filter[1][data][type]=string&filter[1][data][value]=Columbus

This is the URL request that I get from browser.

From this URL, I need to get the filter related data as a JSON object.

Basically I have filter parameters like these in the requested URL:

filter[0][field]=site
filter[0][data][type]=string
filter[0][data][value]=test
filter[1][field]=address
filter[1][data][type]=string
filter[1][data][value]=Columbus

I am using the Spring MVC framework.

That doesn't look like JSON. It looks like you are passing a list of maps of maps. Anyway, you should be able to either use a ModelAttribute, or simply use RequestParams to grab them. I am not certain how RequestParams would handle the subscripts, though. — CodeChimp
– CodeChimp, Commented May 2, 2013 at 19:09

SpacePrez · Accepted Answer · 2013-05-16 21:25:37Z

2

Those URL parameters aren't in JSON format. I'm not sure what your question / problem is here... can't you just read in each of those parameters from the URL and then parse the data out of the strings as you need? You could take it as a single parameter and tokenize based on a custom character, or you could just loop through all the parameters and parse each one and add them to an array.

Are you saying that you need to return the data in JSON format? Get your data using the parsed parameters as I described above, then when you have the data merely serialize that object and pass it back over the wire as the body of the response. You'll want to use a JSON serialization library like Jackson which will write the object to a string in JSON for you.

answered May 16, 2013 at 21:25

SpacePrez

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Comments

Mike Clark · Accepted Answer · 2013-05-17 21:00:05Z

This is what that data would probably look like if it were written in JSON:

{
    "filter": 
    [
        { 
            "field": "site",
            "data": 
            { 
                "type": "string",
                "value": "test"
            }
        },
        { 
            "field": "address",
            "data": 
            { 
                "type": "string",
                "value": "Columbus"
            }
        }
    ]
}

Java code that translates from the above JSON to your-format:

JSONObject root = new JSONObject(json);
JSONArray filters = root.getJSONArray("filter");
for (int i = 0; i < filters.length(); i++)
{
    JSONObject filter = filters.getJSONObject(i);
    String field = filter.getString("field");
    JSONObject data = filter.getJSONObject("data");
    String dataType = data.getString("type");
    String dataValue = data.getString("value");
    System.out.println("filter[" + i + "][field]=" + field);
    System.out.println("filter[" + i + "][data][type]=" + dataType);
    System.out.println("filter[" + i + "][data][value]=" + dataValue);
}

Your data format does not appear to be standard, so you will have to parse it yourself.

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