I want to create a common dto like as shown below for receiving the incoming Manager and Staff details from a REST service
public class Employee {
#JsonProperty("name")
public String name;
#JsonProperty("designation")
public String designation;
#JsonProperty("item")
public String item;
#JsonProperty("item")
public List<Item> items;
//setters and getters
}
The problem is that for for Manager the item field will be a List where as for Staff it will be a string, so I have created two field for item, one for receiving String and another for List, but its not working and I am getting Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token.
The incoming json details is like as shown below
Manager incoming json
{
"name": "Rohit",
"designation": "Manager",
"item": {"name": "ABC", "desc": "1234"}
}
Staff incoming json
{
"name": "Manu",
"designation": "Staff",
"item": "abc"
}
Can anyone please tell me some solution for this
You could create a customer deserializer. If the node for the "item" field is an array, then deserialize it as an array, otherwise deserialize it as a String. For example
public static class EmployeeDeserializer extends JsonDeserializer<Employee> {
#Override
public Employee deserialize(JsonParser jp,
DeserializationContext dc)
throws IOException, JsonProcessingException {
Employee emp = new Employee();
JsonNode root = jp.getCodec().readTree(jp);
emp.name = root.get("name").asText();
emp.designation = root.get("designation").asText();
JsonNode itemNode = root.get("item");
if (itemNode.isArray()) {
ArrayNode itemsNode = (ArrayNode) itemNode;
List<Item> items = new ArrayList<>();
for (JsonNode iNode : itemsNode) {
Item item = new Item();
item.name = iNode.get("name").asText();
item.desc = iNode.get("desc").asText();
items.add(item);
}
emp.items = items;
} else if (itemNode.isObject()) {
List<Item> items = new ArrayList<>();
Item item = new Item();
item.name = itemNode.get("name").asText();
item.desc = itemNode.get("desc").asText();
items.add(item);
emp.items = items;
} else {
String item = root.get("item").asText();
emp.item = item;
}
return emp;
}
}
I actually added three cases for "item". It could be a JSON array as multiple Items, a JSON object (which is what you have in your post) as a single Item, or a String for the staff. If it's a JSON object, I just create the single Item and added it to a List
Here is a complete test
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.node.ArrayNode;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import static org.junit.Assert.*;
import org.junit.BeforeClass;
public class EmployeeTest {
#JsonDeserialize(using = EmployeeDeserializer.class)
public static class Employee {
public String name;
public String designation;
public String item;
public List<Item> items;
}
public static class Item {
public String name;
public String desc;
#Override
public String toString() {
return "Item{" + "name=" + name + ", desc=" + desc + '}';
}
}
public static class EmployeeDeserializer extends JsonDeserializer<Employee> {
#Override
public Employee deserialize(JsonParser jp,
DeserializationContext dc)
throws IOException, JsonProcessingException {
Employee emp = new Employee();
JsonNode root = jp.getCodec().readTree(jp);
emp.name = root.get("name").asText();
emp.designation = root.get("designation").asText();
JsonNode itemNode = root.get("item");
if (itemNode.isArray()) {
ArrayNode itemsNode = (ArrayNode) itemNode;
List<Item> items = new ArrayList<>();
for (JsonNode iNode : itemsNode) {
Item item = new Item();
item.name = iNode.get("name").asText();
item.desc = iNode.get("desc").asText();
items.add(item);
}
emp.items = items;
} else if (itemNode.isObject()) {
List<Item> items = new ArrayList<>();
Item item = new Item();
item.name = itemNode.get("name").asText();
item.desc = itemNode.get("desc").asText();
items.add(item);
emp.items = items;
} else {
String item = root.get("item").asText();
emp.item = item;
}
return emp;
}
}
private static ObjectMapper mapper;
#BeforeClass
public static void setUpMapper() {
mapper = new ObjectMapper();
//SimpleModule module = new SimpleModule();
//module.addDeserializer(Employee.class, new EmployeeDeserializer());
//mapper.registerModule(module);
}
#Test
public void should_deserialize_manager_list_ok() throws Exception {
final String mgrJson
= "{\n"
+ " \"name\": \"Rohit\",\n"
+ " \"designation\": \"Manager\",\n"
+ " \"item\": [{\"name\": \"ABC\", \"desc\": \"1234\"}]\n"
+ "}";
Employee mgr = mapper.readValue(mgrJson, Employee.class);
assertEquals("Rohit", mgr.name);
assertEquals("Manager", mgr.designation);
assertNull(mgr.item);
assertEquals(1, mgr.items.size());
assertEquals("ABC", mgr.items.get(0).name);
assertEquals("1234", mgr.items.get(0).desc);
}
#Test
public void should_deserialize_staff_string_ok() throws Exception {
final String staffJson
= "{\n"
+ " \"name\": \"Manu\",\n"
+ " \"designation\": \"Staff\",\n"
+ " \"item\": \"abc\"\n"
+ "}";
Employee staff = mapper.readValue(staffJson, Employee.class);
assertEquals("Manu", staff.name);
assertEquals("Staff", staff.designation);
assertEquals("abc", staff.item);
assertNull(staff.items);
}
#Test
public void should_deserialize_single_item_ok() throws Exception {
final String mgrJson
= "{\n"
+ " \"name\": \"Rohit\",\n"
+ " \"designation\": \"Manager\",\n"
+ " \"item\": {\"name\": \"ABC\", \"desc\": \"1234\"}\n"
+ "}";
Employee mgr = mapper.readValue(mgrJson, Employee.class);
assertEquals("Rohit", mgr.name);
assertEquals("Manager", mgr.designation);
assertNull(mgr.item);
assertEquals(1, mgr.items.size());
assertEquals("ABC", mgr.items.get(0).name);
assertEquals("1234", mgr.items.get(0).desc);
}
}
You can make Manager and Staff extend an abstract class Employee, and then use the 'designation' JSON property to distinguish them:
// note hashCode(), equals() and toString() methods left out for brevity!
#JsonTypeInfo(use = Id.NAME, include = As.PROPERTY, property = "designation")
#JsonSubTypes({ #JsonSubTypes.Type(Staff.class), #JsonSubTypes.Type(Manager.class) })
public static abstract class Employee {
#JsonProperty("name")
public String name;
public Employee(String name) {
this.name = name;
}
public Employee() {
}
}
#JsonTypeName("Manager")
public static final class Manager extends Employee {
#JsonProperty("item")
public List<Item> items;
public Manager(String name, List<Item> items) {
super(name);
this.items = items;
}
public Manager() {
}
public static final class Item {
public final String name;
public final String desc;
public Item(#JsonProperty("name") String name, #JsonProperty("desc") String desc) {
this.name = name;
this.desc = desc;
}
}
}
#JsonTypeName("Staff")
public static final class Staff extends Employee {
#JsonProperty("item")
public String item;
public Staff(String name) {
super(name);
this.item = item;
}
public Staff() {
}
}
Tests:
#Test
public void polymorphic_deserialization_of_manager() throws Exception {
ObjectMapper mapper = new ObjectMapper().enable(JsonParser.Feature.ALLOW_SINGLE_QUOTES)
.enable(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES)
.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY)
.enable(SerializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED);
String json = "{ name: 'Rohit', designation: 'Manager', item: { name: 'ABC', desc: '1234' } }";
Employee employee = new Manager("Rohit", ImmutableList.of(new Manager.Item("ABC", "1234")));
assertThat(mapper.readValue(json, Employee.class), equalTo(employee));
assertThat(mapper.writeValueAsString(employee), equivalentTo(json));
}
#Test
public void polymorphic_deserialization_of_staff() throws Exception {
ObjectMapper mapper = new ObjectMapper().enable(JsonParser.Feature.ALLOW_SINGLE_QUOTES).enable(
JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES);
String json = "{ name: 'Manu', designation: 'Staff', item: 'abc' }";
Employee employee = new Staff("Manu", "abc");
assertThat(mapper.readValue(json, Employee.class), equalTo(employee));
assertThat(mapper.writeValueAsString(employee), equivalentTo(json));
}
Related
I want to read a json file and store it into objects so that I can use it in my logic. After multiple attempts I was able to fetch the json into a Map. But I want the values to be stored in object and not a map.
Below is my code where I tried to fetch it and store in Currency object.
package com.springboot.currencyExchange;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.*;
import com.springboot.currencyExchange.model.*;
import com.springboot.currencyExchange.model.Currency;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.springboot.currencyExchange.service.MarketStrategyImpl;
#SpringBootApplication
public class CurrencyExchangeApplication {
#SuppressWarnings({ "rawtypes", "unchecked" })
public static void main(String[] args) throws FileNotFoundException, IOException, ParseException {
// SpringApplication.run(CurrencyExchangeApplication.class, args);
Object obj = new JSONParser().parse(new FileReader(
"*absolute path*\AvailableMarket.json"));
JSONObject jobj = (JSONObject) obj;
JSONArray ja = (JSONArray) jobj.get("currencies");
Iterator<Currency> itr1 = null;
Iterator<CurrentMarket> itr2 = ja.iterator();
while (itr2.hasNext()) {
itr1 = (Iterator<Currency>) (((List) itr2.next()).iterator());
while (itr1.hasNext()) {
Currency pair = itr1.next();
// System.out.println(pair.getKey() + " : " + pair.getValue());
}
}
}
}
Below is my JSON file
{
"currencies": [
{
"currencyName": "Euro",
"price": 80
},
{
"currencyName": "Pound",
"price": 90
},
{
"currencyName": "USD",
"price": 75
}
],
"trades": [
{
"take": "Euro",
"give": "USD"
},
{
"take": "USD",
"give": "Pound"
}
]
}
Below are the POJO classes I created to store the JSON values:
package com.springboot.currencyExchange.model;
import java.util.List;
public class CurrentMarket {
public List<Currency> currency;
public List<Trade> trade;
public CurrentMarket() {
super();
}
public List<Currency> getCurrency() {
return currency;
}
public void setCurrency(List<Currency> currency) {
this.currency = currency;
}
public List<Trade> getTrade() {
return trade;
}
public CurrentMarket(List<Currency> currency, List<Trade> trade) {
super();
this.currency = currency;
this.trade = trade;
}
#Override
public String toString() {
return "CurrentMarket [currency=" + currency + ", trade=" + trade + "]";
}
public void setTrade(List<Trade> trade) {
this.trade = trade;
}
}
Currency.java
package com.springboot.currencyExchange.model;
import java.io.Serializable;
#SuppressWarnings("serial")
public class Currency implements Serializable{
String currencyName;
Double price;
public String getCurrencyName() {
return currencyName;
}
public void setCurrencyName(String currencyName) {
this.currencyName = currencyName;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
#Override
public String toString() {
return "Currency [currencyName=" + currencyName + ", price=" + price + "]";
}
public Currency(String currencyName, Double price) {
super();
this.currencyName = currencyName;
this.price = price;
}
}
Trade.java
package com.springboot.currencyExchange.model;
import java.util.ArrayList;
public class Trade {
ArrayList<String> take;
ArrayList<String> give;
public ArrayList<String> getTake() {
return take;
}
public Trade(ArrayList<String> take, ArrayList<String> give) {
super();
this.take = take;
this.give = give;
}
public void setTake(ArrayList<String> take) {
this.take = take;
}
public ArrayList<String> getGive() {
return give;
}
public void setGive(ArrayList<String> give) {
this.give = give;
}
}
I also tried the GSON approach but couldn't fetch it in desired format.
Below is the error message I get with current setup:
Exception in thread "main" java.lang.ClassCastException: class org.json.simple.JSONObject cannot be cast to class java.util.List (org.json.simple.JSONObject is in unnamed module of loader 'app'; java.util.List is in module java.base of loader 'bootstrap')
at com.springboot.currencyExchange.CurrencyExchangeApplication.main(CurrencyExchangeApplication.java:32)
I am not sure how else can I proceed. Any help would be appreciated.
You need to make a few changes at first.
As Abrar Ansari said, change the type of the variables from ArrayList to String in the Trade class. Also rename the currency and trade variables from the CurrencyMarket class to currencies and trades. Make all fields private in all model classes and make sure you have default constructors in all model classes. Then use Jackson's ObjectMapper to deserialize the json file into an object of type CurrentMarket:
ObjectMapper objectMapper = new ObjectMapper();
CurrentMarket currentMarket = objectMapper.readValue(new ClassPathResource("AvailableMarket.json").getFile(),
CurrentMarket.class);
for example I have a json object like this:
{
"pic":"1.jpg",
"products":[
{
"id":1,
"pic":"4.jpg"
}
]
}
now I want to fetch all pic key inside an array or a list.
the result must be: ["1.jpg","4.jpg"]
There is a simple solution for this in jackson library.
String value = "{\"pic\":\"1.jpg\",\"products\":[{\"id\":1,\"pic\":\"4.jpg\"}]}";
JsonNode jsonNode = new ObjectMapper().readTree(value);
System.out.println(jsonNode.findValuesAsText("pic"));
You can add jackson by using following maven dependency.
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.11.1</version>
</dependency>
You can also pass file, inputstream to readTree().
Please try this code:
//define a list which will contain pic names
List<String> picList = new ArrayList<>();
try {
//jsonMap: your json object variable name
String picName = (String) jsonMap.get("pic");
picList.add(picName);
List<Map<String, Object>> products = (List<Map<String, Object>>) jsonMap.get("products");
for (Map<String, Object> product : products) {
String pic = (String) product.get("pic");
picList.add(pic);
}
System.out.println("=====List of pics===="+picList);
} catch (Exception e) {
}
It would be better if you parse the json to a POJO class. You can use Gson to convert json string to below Data class object.
String jsonString = "you json string here"
Data object = Gson().fromJson(jsonString, Data.class)
Now you have the object and can get product list from which you can iterate and get "pic" values.
Below is the class
package com.example;
import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Data {
#SerializedName("pic")
#Expose
private String pic;
#SerializedName("products")
#Expose
private List<Product> products = null;
public String getPic() {
return pic;
}
public void setPic(String pic) {
this.pic = pic;
}
public List<Product> getProducts() {
return products;
}
public void setProducts(List<Product> products) {
this.products = products;
}
}
-----------------------------------com.example.Product.java-----------------------------------
package com.example;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Product {
#SerializedName("id")
#Expose
private int id;
#SerializedName("pic")
#Expose
private String pic;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPic() {
return pic;
}
public void setPic(String pic) {
this.pic = pic;
}
}
If you want the list of pics within the products node, then you can get the entire JSON into a JSONObject, and iterate over the inner JSONArray
String str = "{\n" +
"\"pic\":\"1.jpg\",\n" +
"\"products\":[\n" +
"{\n" +
"\"id\":1,\n" +
"\"pic\":\"4.jpg\"\n" +
"}\n" +
"]\n" +
"\n" +
"}";
ArrayList<String> list = new ArrayList<>();
try {
JSONObject root = new JSONObject(str);
JSONArray products = root.getJSONArray("products");
for (int i = 0; i <= products.length(); i++) {
String value = ((JSONObject) products.get(i)).getString("pic");
list.add(value);
}
} catch (JSONException e) {
e.printStackTrace();
}
Log.d(TAG, "onCreate: " + list);
I'm trying to deserialize some xml with nested properties with the same name, but the wrapper name is unique for each property. Example XML below.
I've tried playing with switching wrapper and property names but doesn't seem to work.
<response>
<string>
<item>Sample string.</item>
<item>Another sample string.</item>
</string>
<number>
<item>123123123</item>
<item>900912</item>
</number>
</response>
I'm trying to deserialize the above XML into a List<String> and List<Integer> variable.
I managed to make it creating a pair or wrappers of ArrayLists as inner classes:
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
#JacksonXmlRootElement(localName="response")
public class ResponseObjectList implements Serializable {
#JacksonXmlProperty(localName = "string")
private StringArrayListContainer string;
#JacksonXmlProperty(localName = "number")
private IntegerArrayListContainer number;
public ResponseObjectList() {
super();
}
public ResponseObjectList(List<String> stringItems, List<Integer> intItems) {
super();
this.string = new StringArrayListContainer(stringItems);
this.number = new IntegerArrayListContainer(intItems);
}
public StringArrayListContainer getString() {
return string;
}
public void setString(StringArrayListContainer string) {
this.string = string;
}
public IntegerArrayListContainer getNumber() {
return number;
}
public void setNumber(IntegerArrayListContainer number) {
this.number = number;
}
public static class StringArrayListContainer extends ArrayListContainer<String>{
public StringArrayListContainer() {
super();
}
public StringArrayListContainer(List<String> item) {
super(item);
}
}
public static class IntegerArrayListContainer extends ArrayListContainer<Integer>{
public IntegerArrayListContainer() {
super();
}
public IntegerArrayListContainer(List<Integer> item) {
super(item);
}
}
public static class ArrayListContainer<T extends Serializable>{
#JacksonXmlElementWrapper(useWrapping=false)
#JacksonXmlProperty(localName="item")
private List<T> item;
public ArrayListContainer(List<T> item) {
super();
this.item = item;
}
public ArrayListContainer() {
super();
}
public List<T> getItem() {
return item;
}
public void setItem(List<T> item) {
this.item = item;
}
}
}
Tests looked good:
#Test
public void test3() throws JsonProcessingException {
ResponseObjectList response = new ResponseObjectList(
Arrays.asList(new String[] {"Sample string.","Another sample string"}),
Arrays.asList(new Integer[] {123123123,900912})
);
XmlMapper xmlMapper = new XmlMapper();
String content = xmlMapper.writeValueAsString(response);
this.logger.debug("content: " + content);
// content: <response xmlns=""><string><item>Sample string.</item><item>Another sample string</item></string><number><item>123123123</item><item>900912</item></number></response>
}
#Test
public void test4() throws JsonParseException, JsonMappingException, IOException {
String xml =
"<response>"
+ "<string>"
+ "<item>Sample string.</item>"
+ "<item>Another sample string</item>"
+ "</string>"
+ "<number>"
+ "<item>123123123</item>"
+ "<item>900912</item>"
+ "</number>"
+ "</response>";
XmlMapper xmlMapper = new XmlMapper();
ResponseObjectList object = xmlMapper.readValue(xml, ResponseObjectList.class);
Assert.assertFalse(object.getString().getItem().isEmpty());
Assert.assertFalse(object.getNumber().getItem().isEmpty());
}
I used Lists instead of ArrayLists both for the wrappers and the tests
For version 2.9.9 simple POJO with JacksonXmlElementWrapper annotation works as expected:
class Response {
#JacksonXmlElementWrapper(localName = "string")
private List<String> strings;
#JacksonXmlElementWrapper(localName = "number")
private List<Integer> numbers;
// getters, setters
}
I have a class like this
public class Item {
#XmlElement(name = "my_id")
private String id;
#XmlElement(name = "my_type")
private String type;
}
I would like to convert this class to a Map which considers the jaxb annotated fields.
E.g. the Result is a map with following entries:
Key: my_id , Value: "the id"
Key: my_type , Value: "the type"
I am not sure how your xml looks like but assuming, it will be an item element, under some parent, you can do it usingadapter (XmlJavaTypeAdapter) . Sample code looks like below:
package test;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Map;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
#XmlAccessorType(XmlAccessType.FIELD)
public class Item {
public Item() {
}
#XmlElement(name = "my_id")
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
#XmlElement(name = "my_type")
private String type;
public String toString() {
return "Item : id-" + getId() + ", type -" + getType();
}
public static void main(String[] args) throws Exception {
String xmlString = "<items>\n"
+ " <item>\n"
+ " <my_id>someID</my_id>\n"
+ " <my_type>someType</my_type>\n"
+ " </item>\n"
+ "</items>";
//System.out.println("xmlString.." + xmlString);
RootElement o = unmarshal(RootElement.class, xmlString);
System.out.println("item Map : "+o.getItem());
}
private static <C> C unmarshal(Class<C> c, String sampleXML) throws Exception {
JAXBContext jc = JAXBContext.newInstance(c);
Unmarshaller unmarshaller = jc.createUnmarshaller();
StringReader reader = new StringReader(sampleXML);
//System.out.println("" + sampleXML);
return (C) unmarshaller.unmarshal(reader);
}
}
#XmlRootElement(name = "items")
#XmlAccessorType(XmlAccessType.FIELD)
class RootElement {
public RootElement() {
System.out.println("RootElement");
}
public Map<String, String> getItem() {
return item;
}
public void setItem(Map<String, String> item) {
this.item = item;
}
#XmlJavaTypeAdapter(ItemAdapter.class)
#XmlElement()
private Map<String, String> item;
}
class ItemAdapter extends XmlAdapter<Item, Map<String, String>> {
#Override
public Map<String, String> unmarshal(Item i) throws Exception {
Map<String, String> r = new HashMap<String, String>();
r.put("my_id", i.getId());
r.put("my_type", i.getType());
return r;
}
#Override
public Item marshal(Map<String, String> v) throws Exception {
Item i = new Item();
i.setId(v.get("my_id"));
i.setType(v.get("my_type"));
return i;
}
}
I have a JSON as below. The goal is to get the corresponding "ip","PRODUCTTYPE" and "ID" values.
{
"customerId": "dummy1",
"nameIdmap": {
"10.2.1.0": "{PRODUCTTYPE=null, ID=123}",
"10.2.1.3": "{PRODUCTTYPE=null, ID=456}",
"10.2.1.4": "{PRODUCTTYPE=null, ID=789}",
"10.2.1.5": "{PRODUCTTYPE=null, ID=193}"
}
}
I am using the ObjectMapper API to parse and fetch the values.
ObjectMapper om = new ObjectMapper();
JsonNode node = om.readTree(stringToBeParsed);
String customerID = node.get("customerId").asText();
System.out.println("The Customer ID is ::: "+customerID);
JsonNode nameIdmap = node.get("nameIdmap");
StreamSupport.stream(nameIdmap.spliterator(), false).forEach(
kv -> {
System.out.println(kv.asText().split(",")[0] +" ,
"+kv.asText().split(",")[1]);
});
But the issue is I, am unable to get the key which is the ip-address in this case. Tried different ways to achieve but could not get what i want.
I checked if the nameIdmap is an array nameIdmap.isArray() but it is false.
I also tried below but could not get the ip i.e the key
JsonNode nameIdmap = node.get("nameIdmap");
StreamSupport.stream(nameIdmap.spliterator(), false).collect(Collectors.toList())
.forEach(item -> {
System.out.println(item.asText());
});;
You can try Custom Deserializer as below
1. Create Item class
This is a POJO which stands for an ID and a map of String and IPItem
public class SOItem {
#Override
public String toString() {
return "SOItem [id=" + id + ", map=" + map + "]";
}
String id;
Map<String, SOIPItem> map = new HashMap();
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Map<String, SOIPItem> getMap() {
return map;
}
public void setMap(Map<String, SOIPItem> map) {
this.map = map;
}
}
2. Create IPItem class
This is a POJO for an ID and ProductType
public class SOIPItem {
private String type;
private String id;
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
#Override
public String toString() {
return "SOIPItem [type=" + type + ", id=" + id + "]";
}
public SOIPItem(String type, String id) {
super();
this.type = type;
this.id = id;
}
}
3. Create a Custom Deserializer
import java.io.IOException;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
public class SOCustDeser extends StdDeserializer<SOItem> {
public SOCustDeser() {
this(null);
}
public SOCustDeser(Class<?> vc) {
super(vc);
}
/**
*
*/
private static final long serialVersionUID = -394222274225082713L;
#Override
public SOItem deserialize(JsonParser parser, DeserializationContext arg1)
throws IOException, JsonProcessingException {
SOItem soItem = new SOItem();
ObjectCodec codec = parser.getCodec();
JsonNode node = codec.readTree(parser);
soItem.setId(node.get("customerId").asText());
JsonNode idmap = node.get("nameIdmap");
Iterator<String> fieldNames = idmap.fieldNames();
while(fieldNames.hasNext()) {
String ip = fieldNames.next();
String textValue = idmap.get(ip).asText();
Pattern p = Pattern.compile("(.*?)=(.*?),(.*?)(\\d+)");
Matcher m = p.matcher(textValue);
if (m.find()) {
soItem.map.put(ip, new SOIPItem(m.group(2), m.group(4)));
}
}
return soItem;
}
}
4. Test class
import java.io.File;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
public class MicsTest {
public static void main(String[] args) throws Exception {
ObjectMapper om = new ObjectMapper();
SimpleModule sm = new SimpleModule();
sm.addDeserializer(SOItem.class, new SOCustDeser());
om.registerModule(sm);
SOItem item = om.readValue(new File("c:\\temp\\test.json"), SOItem.class);
System.out.println(item);
}
}
5. Output
SOItem [id=dummy1, map={10.2.1.0=SOIPItem [type=null, id=123], 10.2.1.3=SOIPItem [type=null, id=456], 10.2.1.5=SOIPItem [type=null, id=193], 10.2.1.4=SOIPItem [type=null, id=789]}]
You can get the field names by nameIdmap.getFieldNames as an iterator. You can then iterate over like that:
...
Iterator<String> fieldNames = idmap.getFieldNames();
while(fieldNames.hasNext()) {
String ip = fieldNames.next();
String textValue = idmap.get(ip).getTextValue()
System.out.println(ip + ":" + textValue);
}
If the nested information is also JSON you can then access it further via idmap.get(ip).get("ID"); if not then you still have the option to find it by regex like that:
Pattern p = Pattern.compile("ID=(\\d+)");
Matcher m = p.matcher(textValue);
if(m.find()) {
System.out.println(ip + ":" + m.group(1));
}
Best way to handle these scenarios is to create a matching pojo for your json. This way it gives you flexibility to play around with the data.
Create classes like these
public class Someclass {
private String customerId;
Map<String, String> nameIdmap;
public Map<String, String> getNameIdmap() {
return nameIdmap;
}
public void setNameIdmap(Map<String, String> nameIdmap) {
this.nameIdmap = nameIdmap;
}
public Someclass() {
}
public String getCustomerId() {
return customerId;
}
public void setCustomerId(String customerId) {
this.customerId = customerId;
}
}
And this code will translate your json to SomeClass class
String json = "<copy paste your json here>";
Someclass someclass = objectMapper.readValue(json, Someclass.class);
String s = someclass.getNameIdmap().get("10.2.1.0");
String[] splits = s.split(" ");
String productType = splits[0].split("=")[1];
String id = splits[1].split("=")[1];
System.out.println(productType + " " + id);