Converting a JSON object with multiple lists as fields
I'm using jackson's ObjectMapper to convert JSON files into Java objects.
How do I convert a JSON object that has an array as one of its fields? Example below:
{
"list":[
{
"value":"example"
},
{
"value":"example2"
}
]
}
ObjectMapper converts this into a LinkedHashMap with lines as the key and the value is an ArrayList with LinkedHashMaps, which have valueand example and so on.
Is there a way to read this json as an Object with a field list that is a List/Array containing objects which would fit (in this case, a simple object with String value as a field)?
java json jackson
asked Nov 20 '18 at 18:22
kulijanakulijana
337
add a comment |
I'm using jackson's ObjectMapper to convert JSON files into Java objects.
How do I convert a JSON object that has an array as one of its fields? Example below:
{
"list":[
{
"value":"example"
},
{
"value":"example2"
}
]
}
ObjectMapper converts this into a LinkedHashMap with lines as the key and the value is an ArrayList with LinkedHashMaps, which have valueand example and so on.
Is there a way to read this json as an Object with a field list that is a List/Array containing objects which would fit (in this case, a simple object with String value as a field)?
java json jackson
asked Nov 20 '18 at 18:22
kulijanakulijana
337
add a comment |
I'm using jackson's ObjectMapper to convert JSON files into Java objects.
How do I convert a JSON object that has an array as one of its fields? Example below:
{
"list":[
{
"value":"example"
},
{
"value":"example2"
}
]
}
ObjectMapper converts this into a LinkedHashMap with lines as the key and the value is an ArrayList with LinkedHashMaps, which have valueand example and so on.
Is there a way to read this json as an Object with a field list that is a List/Array containing objects which would fit (in this case, a simple object with String value as a field)?
java json jackson
asked Nov 20 '18 at 18:22
kulijanakulijana
337
I'm using jackson's ObjectMapper to convert JSON files into Java objects.
How do I convert a JSON object that has an array as one of its fields? Example below:
{
"list":[
{
"value":"example"
},
{
"value":"example2"
}
]
}
ObjectMapper converts this into a LinkedHashMap with lines as the key and the value is an ArrayList with LinkedHashMaps, which have valueand example and so on.
Is there a way to read this json as an Object with a field list that is a List/Array containing objects which would fit (in this case, a simple object with String value as a field)?
java json jackson
java json jackson
asked Nov 20 '18 at 18:22
kulijanakulijana
337
asked Nov 20 '18 at 18:22
kulijanakulijana
337
asked Nov 20 '18 at 18:22
kulijanakulijana
337
asked Nov 20 '18 at 18:22
kulijanakulijana
337
asked Nov 20 '18 at 18:22
kulijanakulijana
337
337
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Found a way to do this. This solution is based around Gson instead of ObjectMapper.
Basically Gson manages to convert arrays into the fields as I wanted it to happen here, instead of generating a lot of LinkedHashMaps.
answered Nov 20 '18 at 19:02
kulijanakulijana
337
add a comment |
You can achieve this with Jackson in a straight-forward way.
For this you need to model the JSON structure by some Java classes.
First, you need a class for modeling the whole JSON content
(let us call it Root) with a list property.
public class Root {
private List<Item> list;
// public getter and setter (omitted here for brevity)
}
Next, you need a class for modeling the list items
(let us call it Item) with a value property.
public class Item {
private String value;
// public getter and setter (omitted here for brevity)
}
Then you are able to read JSON content into a Java Root object by using
one of ObjectMapper's readValue(..., Class<T>) methods.
For example reading from a File:
ObjectMapper objectMapper = new ObjectMapper();
Root root = objectMapper.readValue(new File("example.json"), Root.class);
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Found a way to do this. This solution is based around Gson instead of ObjectMapper.
Basically Gson manages to convert arrays into the fields as I wanted it to happen here, instead of generating a lot of LinkedHashMaps.
answered Nov 20 '18 at 19:02
kulijanakulijana
337
add a comment |
Found a way to do this. This solution is based around Gson instead of ObjectMapper.
Basically Gson manages to convert arrays into the fields as I wanted it to happen here, instead of generating a lot of LinkedHashMaps.
answered Nov 20 '18 at 19:02
kulijanakulijana
337
add a comment |
Found a way to do this. This solution is based around Gson instead of ObjectMapper.
Basically Gson manages to convert arrays into the fields as I wanted it to happen here, instead of generating a lot of LinkedHashMaps.
answered Nov 20 '18 at 19:02
kulijanakulijana
337
Found a way to do this. This solution is based around Gson instead of ObjectMapper.
Basically Gson manages to convert arrays into the fields as I wanted it to happen here, instead of generating a lot of LinkedHashMaps.
answered Nov 20 '18 at 19:02
kulijanakulijana
337
answered Nov 20 '18 at 19:02
kulijanakulijana
337
answered Nov 20 '18 at 19:02
kulijanakulijana
337
answered Nov 20 '18 at 19:02
kulijanakulijana
337
337
add a comment |
add a comment |
You can achieve this with Jackson in a straight-forward way.
For this you need to model the JSON structure by some Java classes.
First, you need a class for modeling the whole JSON content
(let us call it Root) with a list property.
public class Root {
private List<Item> list;
// public getter and setter (omitted here for brevity)
}
Next, you need a class for modeling the list items
(let us call it Item) with a value property.
public class Item {
private String value;
// public getter and setter (omitted here for brevity)
}
Then you are able to read JSON content into a Java Root object by using
one of ObjectMapper's readValue(..., Class<T>) methods.
For example reading from a File:
ObjectMapper objectMapper = new ObjectMapper();
Root root = objectMapper.readValue(new File("example.json"), Root.class);
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
add a comment |
You can achieve this with Jackson in a straight-forward way.
For this you need to model the JSON structure by some Java classes.
First, you need a class for modeling the whole JSON content
(let us call it Root) with a list property.
public class Root {
private List<Item> list;
// public getter and setter (omitted here for brevity)
}
Next, you need a class for modeling the list items
(let us call it Item) with a value property.
public class Item {
private String value;
// public getter and setter (omitted here for brevity)
}
Then you are able to read JSON content into a Java Root object by using
one of ObjectMapper's readValue(..., Class<T>) methods.
For example reading from a File:
ObjectMapper objectMapper = new ObjectMapper();
Root root = objectMapper.readValue(new File("example.json"), Root.class);
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
add a comment |
You can achieve this with Jackson in a straight-forward way.
For this you need to model the JSON structure by some Java classes.
First, you need a class for modeling the whole JSON content
(let us call it Root) with a list property.
public class Root {
private List<Item> list;
// public getter and setter (omitted here for brevity)
}
Next, you need a class for modeling the list items
(let us call it Item) with a value property.
public class Item {
private String value;
// public getter and setter (omitted here for brevity)
}
Then you are able to read JSON content into a Java Root object by using
one of ObjectMapper's readValue(..., Class<T>) methods.
For example reading from a File:
ObjectMapper objectMapper = new ObjectMapper();
Root root = objectMapper.readValue(new File("example.json"), Root.class);
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
You can achieve this with Jackson in a straight-forward way.
For this you need to model the JSON structure by some Java classes.
First, you need a class for modeling the whole JSON content
(let us call it Root) with a list property.
public class Root {
private List<Item> list;
// public getter and setter (omitted here for brevity)
}
Next, you need a class for modeling the list items
(let us call it Item) with a value property.
public class Item {
private String value;
// public getter and setter (omitted here for brevity)
}
Then you are able to read JSON content into a Java Root object by using
one of ObjectMapper's readValue(..., Class<T>) methods.
For example reading from a File:
ObjectMapper objectMapper = new ObjectMapper();
Root root = objectMapper.readValue(new File("example.json"), Root.class);
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
edited Nov 20 '18 at 19:16
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
answered Nov 20 '18 at 19:10
Thomas FritschThomas Fritsch
5,406122134
5,406122134
add a comment |
add a comment |
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