package com.hmkcode;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.LinkedList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.hmkcode.vo.Article;
public class JSONServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
// This will store all received articles
List<Article> articles = new LinkedList<Article>();
/***************************************************
* URL: /jsonservlet
* doPost(): receives JSON data, parse it, map it and send back as JSON
****************************************************/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{
// 1. get received JSON data from request
BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
String json = "";
if(br != null){
json = br.readLine();
}
// 2. initiate jackson mapper
ObjectMapper mapper = new ObjectMapper();
// 3. Convert received JSON to Article
Article article = mapper.readValue(json, Article.class);
// 4. Set response type to JSON
response.setContentType("application/json");
// 5. Add article to List<Article>
articles.add(article);
// 6. Send List<Article> as JSON to client
mapper.writeValue(response.getOutputStream(), articles);
}
}