datatables request and response by java

Jsonable.java

package com.lp.jackson;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Jsonable {
	public String asJson() {
		ObjectMapper mapper = new ObjectMapper();
		try {
			return mapper.writeValueAsString(this);
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static Object fromJson(String json, Class clz) {
		ObjectMapper mapper = new ObjectMapper();
		Object t = null;
		try {
			t = mapper.readValue(json, clz);
		} catch (JsonParseException e) {
			e.printStackTrace();
		} catch (JsonMappingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return t;
	}
}

log.log

{"draw":"drawit","start":0,"length":10,"order":[{"column":"username","dir":"desc"},{"column":"password","dir":"asc"}],"search":{"value":"searchValue","regex":false},"columns":[{"data":"ccccccccccccccccc","name":"username","searchable":true,"orderable":true,"search":{"value":"searchValueC1","regex":false}},{"data":"aaaaaaaaaaaaa","name":"password","searchable":true,"orderable":true,"search":{"value":"searchValueC2","regex":false}},{"data":"hhhhhhhhhhhhhhhhh","name":"address","searchable":true,"orderable":true,"search":{"value":"searchValueC3","regex":false}}]}
{"draw":"drawit","start":0,"length":10,"order":[{"column":"username","dir":"desc"},{"column":"password","dir":"asc"}],"search":{"value":"searchValue","regex":false},"columns":[{"data":"ccccccccccccccccc","name":"username","searchable":true,"orderable":true,"search":{"value":"searchValueC1","regex":false}},{"data":"aaaaaaaaaaaaa","name":"password","searchable":true,"orderable":true,"search":{"value":"searchValueC2","regex":false}},{"data":"hhhhhhhhhhhhhhhhh","name":"address","searchable":true,"orderable":true,"search":{"value":"searchValueC3","regex":false}}]}
===================================== 
{"draw":1,"recordsTotal":57,"recordsFiltered":57,"datas":[["Angelica","Ramos","System Architect","London","9th Oct 09","$2,875"],["Ashton","Cox","Technical Author","San Francisco","12th Jan 09","$4,800"]]}

Request.java

package com.lp.jackson;

import java.util.List;

public class Request extends Jsonable {
	public String draw;
	public int start;
	public int length;
	public List<Order> order;
	public Search search;
	public List<Column> columns;

}

class Search {
	public String value;
	public boolean regex;
}

class Order {
	public String column;
	public String dir;
}

class Column {
	public String data;
	public String name;
	public boolean searchable;
	public boolean orderable;
	public Search search;
}

Response.java

package com.lp.jackson;

import java.util.List;

public class Response extends Jsonable {
	public int draw;
	public int recordsTotal;
	public int recordsFiltered;
	public List<List<String>> datas;
}

TestCase.java

package com.lp.jackson;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class TestCase {

	public static Request createRequest() {
		Request req = new Request();
		req.draw = "drawit";
		req.length = 10;
		req.start = 0;

		List<Order> order = new ArrayList<Order>();

		Order h = new Order();
		h.column = "username";
		h.dir = "desc";
		order.add(h);

		Order h2 = new Order();
		h2.column = "password";
		h2.dir = "asc";
		order.add(h2);

		req.order = order;

		Search search = new Search();
		search.value = "searchValue";
		search.regex = false;
		req.search = search;

		Column column = new Column();
		column.orderable = true;
		column.searchable = true;
		column.name = "username";
		column.data = "ccccccccccccccccc";
		Search searchC1 = new Search();
		searchC1.value = "searchValueC1";
		searchC1.regex = false;
		column.search = searchC1;

		Column column2 = new Column();
		column2.orderable = true;
		column2.searchable = true;
		column2.name = "password";
		column2.data = "aaaaaaaaaaaaa";
		Search searchC2 = new Search();
		searchC2.value = "searchValueC2";
		searchC2.regex = false;
		column2.search = searchC2;

		Column column3 = new Column();
		column3.orderable = true;
		column3.searchable = true;
		column3.name = "address";
		column3.data = "hhhhhhhhhhhhhhhhh";
		Search searchC3 = new Search();
		searchC3.value = "searchValueC3";
		searchC3.regex = false;
		column3.search = searchC3;

		List<Column> columns = new ArrayList<Column>();
		columns.add(column);
		columns.add(column2);
		columns.add(column3);

		req.columns = columns;
		return req;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Request req = createRequest();
		System.out.println(req.asJson());

		Request req2 = (Request) Jsonable.fromJson(req.asJson(), Request.class);
		System.out.println(req2.asJson());

		System.out.println("=====================================");
		Response resp = new Response();
		resp.draw = 1;
		resp.recordsFiltered = 57;
		resp.recordsTotal = 57;
		List<List<String>> data = new ArrayList<List<String>>();
		String[] user1 = new String[] { "Angelica", "Ramos",
				"System Architect", "London", "9th Oct 09", "$2,875" };
		String[] user2 = new String[] { "Ashton", "Cox", "Technical Author",
				"San Francisco", "12th Jan 09", "$4,800" };
		data.add(Arrays.asList(user1));
		data.add(Arrays.asList(user2));
		resp.datas = data;
		System.out.println(resp.asJson());
	}

}