I have the following Java Map. Map<String, String> containing values such as:
876234876, google
mike@hotmail, hotmail
9879892, google
I need to convert it to the following JSON object structure and Java JSON objects are not my friend.
"addresses" : [
{ "address":"876234876", "domain":"google" },
{ "address":"mike@hotmail", "domain":"hotmail" },
{ "address":"9879892", "domain":"google" }
]
To create the JSON you ask, you need to insert a JSONObject into a JSONArray. So for each Entry of your Map<String, String>, create a JSONObject like {"address": entry.key, "domain": entry.value} and add those to a JSONArray.
Let's use a Stream.map to create that object and insert the result into the array directly:
public static JSONObject createJson(Map<String, String> value) {
JSONObject result = new JSONObject();
JSONArray addresses = new JSONArray();
result.put("addresses", addresses);
value.entrySet().stream() //iterate the map
.map(e -> { //build an object
JSONObject address = new JSONObject();
address.put("address", e.getKey());
address.put("domain", e.getValue());
return address;
})
.forEach(addresses::put); //insert into the array
return result;
}
And test it with :
public static void main(String[] args) {
Map<String, String> values = new HashMap<>();
values.put("876234876", "google");
values.put("mike@hotmail", "hotmail");
values.put("9879892", "google");
System.out.println(createJson(values).toString(4));
}
And the result :
{"addresses": [
{
"address": "9879892",
"domain": "google"
},
{
"address": "876234876",
"domain": "google"
},
{
"address": "mike@hotmail",
"domain": "hotmail"
}
]}
Using the API : JSON In Java
<!-- https://mvnrepository.com/artifact/org.json/json -->
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20180130</version>
</dependency>
Check this solution:
List<String> addresses = new ArrayList<>();
map.forEach((k, v) -> {
Map<String, String> nn = new HashMap<>();
nn.put("address", k);
nn.put("domain", v);
addresses.add(JSONValue.toJSONString(nn));
});
JSONObject result = new JSONObject(Collections.singletonMap("addresses", new JSONArray(addresses)));
Your JAVA objects should look like this :
List of addresses
@XmlRootElement
public class Foo {
private List<Address> addresses;
// Getter, Setter, ...
}
Address
public class Address {
private String address;
private String domain;
// Getters, setters, ...
}
