I am getting the json data from client,i want convert that json data into java object and store into db [duplicate]

Question

 Client client = Client.create(); WebResource webResource = client .resource("my url"); String name = "adn"; String password = "34"; String authString = name + ":" + password; String authStringEnc = new BASE64Encoder().encode(authString .getBytes()); // System.out.println("Base64 encoded auth string: " + // authStringEnc); ClientResponse response = webResource.accept("application/json") .header("Authorization", "Basic " + authStringEnc) .get(ClientResponse.class); String output = response.getEntity(String.class); System.out.println(output);

I am getting the o/p like this

{"counts":[{"college_name":"GPT , Karimngr","college_epass_id":18},
{"college_name":"GPT, Dra","college_epass_id":444},

I want to convert that json data type to java object can you please suggest.

Rohan Kadu · Accepted Answer · 2017-12-18 14:14:19Z

Checkout this JAX-RS example.

JAX-RS is Java's inbuilt Marshalling and UnMarshalling mechanism. Where by just adding simple XML based annotations we can simply convert JSON or XML request into Java POJO models and visa -versa.

Above example will give overview of basic usage of JAX-RS REST Webservices.

Use of Jackson

ObjectMapper mapper = new ObjectMapper(); Map<String,Object> map = mapper.readValue(json, Map.class);

Your classes will be some like

public class CollegeList{ @JsonProperty("counts") public List<College> counts; } public class College{ @JsonProperty("college_name") public String college_name; @JsonProperty("college_epass_id") public int college_epass_id; }

You can convert the json into respective object by

CollegeList colleges = mapper.readValue(jsonString, CollegeList .class);

Sharing Reference Link for more details.

Hi Rohan,Thank you for giving suggestion. but i am getting the json data .i want to convert that json into java object .i created pojo class and i wrote code like this
//for converting json to java object Gson gson = new GsonBuilder() .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC) .serializeNulls() .create(); Counts cou = gson.fromJson(output, Counts.class); String countArrayJson = "[{'college_name':'college__id' {'college_name':'college__id'}]"; ArrayList<Counts> coun = gson.fromJson(countArrayJson, ArrayList.class); System.out.println(cou); o/p:Counts [College_name=null, College_epass_id=0]
Ohhh Got it.... I had confused with your question earlier. You can also use Jack Son and I have edited Answer In order to add Code Snippets . Please have a look if it helps.
hi rohan ,, i wrote code like this counts[] enums = gson.fromJson(output, counts[].class); System.out.println(enums); o/p:Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2

Maksym Rudenko · Accepted Answer · 2017-12-18 10:18:06Z

As you didn't specify what exactly container you use there are a lot of options, but in any case you need to create DTO (data transfer object class), get data from JSON and put in this class, then to DB.

The most straightforward is get response as string and parse with Jackson

In real java web projects modern web containers usually used, which can convert such JSON to your DTO automatically , so I propose to read documentation of your container for start

Hi Maxim, i wrote code like this counts[] enums = gson.fromJson(output, counts[].class); System.out.println(enums); o/p:Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 – can you please suggest any solution for this
Well, this is another separate question, but anyway: you are telling gson that you expect array of counts, but an object comes in response. You are waiting for [a,b,c], but {<object body>} comes. For debugging you can parse it as string system.out and check what you receive. related

Bennani HAMZA · Accepted Answer · 2017-12-18 10:26:04Z

Check out Google's Gson: http://code.google.com/p/google-gson/

From their website:

Gson gson = new Gson(); // Or use new GsonBuilder().create(); MyType target2 = gson.fromJson(json, MyType.class); // deserializes json into target2

You would just need to make a MyType class (renamed, of course) with all the fields in the json string. It might get a little more complicated when you're doing the arrays, if you prefer to do all of the parsing manually (also pretty easy) check out http://www.json.org/ and download the Java source for the Json parser objects.

Hi Bennani, i wrote code like this counts[] enums = gson.fromJson(output, counts[].class); System.out.println(enums); o/p:Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 – can you please suggest any solution for this –

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I am getting the json data from client,i want convert that json data into java object and store into db [duplicate]

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