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I have to represent in JSON null Integer in this way score: . Show name of the attribute and empty space if Integer is null. Now if Integer is null, then JSON doesn't show attribute. Is it possible to do it with Integer?
It is not possible to leave a property value empty in JSON.
The possible value type for the fields are:
Set your variable to something distinctable like -1 or something.
JSON represents data as name/value pairs. There must be a value present if the name is present. See JSON.org for the complete syntax.
A null can be represented by specifying null ...
{name: "Steve", score : null}
... or by omitting the name 'score' from the JSON ...
{name : "Steve"}
Related
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I have a class A, with two variable varOne, varTwo,
While assigning I only assigned varTwo, but when converting to JSON I'm getting both the value
one which was unassigned is as null.
What can I do to restrict varOne. if varOne is unassigned the I don't want it at all in Json.
I tried reconstruct the JSON. but feels like could do better.
You can put #JsonInclude(JsonInclude.Include.NON_NULL) above the class
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So i need the following values: Values
I want to get them and save them in a variable for example. Do you have any suggestions for me ?
I want to get them to save the last position of an element. :)
if you have access to your element you can use a reference to it with a ViewChild for example https://angular.io/api/core/ViewChild and then you can use
myElementRef.style.transform
This will only give you a string containing the value of the property transform. If you want to access the values you would have to parse the string.
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The response to a REST web service has a field of type Double. If its value is '0.0' that field is not appearing in JSON response
Try using #JsonInclude(Include.ALWAYS) as javadoc says
property is to be always included, independent of value of the
property
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Is there a way to read this json without causing nullpointer exception through jackson.
{
"years": [
null
]
}
years is an array of String
Also is that a valid format of json when there are no years?
If you look closely at the tutorials for Jackson, you will see that the JSON this library produces itself for empty arrays uses this notation: { "empty" : [ ]}
Therefore you may try replacing any singular null value in an array with just an empty array before sending your JSON to Jackson, it should accept without throwing any exceptions.
Canonically, a ' null' member of an array is actually valid JSON syntax. See also http://en.wikipedia.org/wiki/JSON. Members of an array can be of any type, thus they can be:
Strings
Numbers
Booleans
Arrays
Objects
null
For your usage scenario however, I would recommend using the empty array instead, because it is simply far easier to program with. For example, consider a usage case where you call some function f() on each of your 'years' which wants an integer input. Code like
foreach(x in array){f(x);} will fail because you will call f() with a 'null' type instead of an integer, causing errors. If you instead used the empty array, the correct behaviour will happen without having to treat the case where there are no years diffrently by explicitly looking for the null. Just makes your life easier that way.
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I have a text file which contains the follwing
{"sno":"1c8d1d7eaa32ff3f58a8822111276d5a","at":"app","tt":{"AppParam1":"AppParamValue1","AppParam2":"AppParamValue2"}},"c":{"dt":"Microsoft XDeviceEmulator","pn":"WP","pv":"8.0.9832.0"}
In java I want to find 'sno', 'pn' and 'pv' and replace the values of (what I mean is) currently the above text file has
"sno" has value "1c8d1d7eaa32ff3f58a8822111276d5a"
"pn" has value "WP"
"pv" has value "8.0.9832.0"
New values
"sno" has to be changed to "637829"
"pn" has to be changed to "XYZ"
"pv" has to be changed to "2.2.4.0"
Your help is much appreciated !
Thanks
That's a JSON object.
Convert that string to a JSON object, change the values and then convert it again to a string.
Here you can read about JSON objects in java: http://www.json.org/java/
And here an easy tuto on how to work with them: http://answers.oreilly.com/topic/257-how-to-parse-json-in-java/
You can convert it into JSON, make you changes and then convert it back to string.
Or if you really want to replace these values by yourself, you can use these lines :
yourstring = yourstring.replaceFirst("\"sno\":\"[^\"]+\"", "\"sno\":\"637829\"");
yourstring = yourstring.replaceFirst("\"pn\":\"[^\"]+\"", "\"pn\":\"XYZ\"");
yourstring = yourstring.replaceFirst("\"pv\":\"[^\"]+\"", "\"pv\":\"2.2.4.0\"");
Only if there are no way theses key can be found elsewhere in the string