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API Returning JSON Array
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‎HESolution/src/com/he/api/APIServlet.java‎

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package com.he.api;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.net.URL;
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import java.nio.file.FileSystems;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import org.json.JSONObject;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.parsers.DocumentBuilder;
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import org.w3c.dom.Document;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.Node;
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import org.w3c.dom.Element;
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import java.io.File;
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import com.he.api.ParamUtility;
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// http://localhost:8080/HESolution/APIServlet?action=SearchById&id=1&firstName=ABC&lastName=DEF&low=0&high=2
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/**
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* Servlet implementation class APIServlet
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*/
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@WebServlet("/API")
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public class APIServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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response.setContentType("text/html");
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PrintWriter out = response.getWriter();
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// Path currentRelativePath = Paths.get("");
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// String s = currentRelativePath.toAbsolutePath().toString()+"\\data.xml";
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// System.out.println("Current Path :"+s);
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// File fXmlFile = new File("F:\\WORK\\JavaEclipse\\HESolution\\src\\com\\he\\api\\data.xml");
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String action = ParamUtility.getValue(request,"action", null);
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String firstName = ParamUtility.getValue(request,"firstName", null);
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String lastName = ParamUtility.getValue(request,"lastName", null);
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int id = Integer.parseInt(ParamUtility.getValue(request,"id", "0").trim());
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int low = Integer.parseInt(ParamUtility.getValue(request,"low", "0").trim());
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int high = Integer.parseInt(ParamUtility.getValue(request,"high", "0").trim());
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try {
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out.println(generateJSONData(action, id, firstName, lastName, low, high));
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} catch (Exception e) {
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e.printStackTrace();
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}
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out.close();
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}
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String generateJSONData(String action,int id,String firstName,String lastName, int low, int high) {
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try {
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// Path currentRelativePath = Paths.get("");
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// String s = currentRelativePath.toAbsolutePath().toString()+"/data.xml";
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URL path = APIServlet.class.getResource("data.xml");
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File fXmlFile = new File(path.getFile());
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// File fXmlFile = new File("F:\\WORK\\JavaEclipse\\HESolution\\src\\com\\he\\api\\data.xml");
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DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
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DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
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Document doc = dBuilder.parse(fXmlFile);
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doc.getDocumentElement().normalize();
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Element root = doc.getDocumentElement();
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NodeList nList = doc.getElementsByTagName("user");
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StringBuffer returnData = new StringBuffer("");
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List<JSONObject> list = new ArrayList<JSONObject>();
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if(action==null) return "";
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if(action.equals("searchById")) {
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if(id >= Integer.valueOf(root.getAttribute("id_auto_increment"))) return "";
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for (int temp = 0; temp < nList.getLength(); temp++) {
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Node nNode = nList.item(temp);
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if (nNode.getNodeType() == Node.ELEMENT_NODE) {
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Element eElement = (Element) nNode;
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if(Integer.parseInt(eElement.getAttribute("id").trim()) == id) {
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// if(returnData.toString().equals("")) {
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// returnData.append("[{");
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// }
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// else {
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// returnData.append("<br>},{");
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// }
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//
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// returnData.append("<br>\"id\": " + eElement.getAttribute("id") + ",");
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// returnData.append("<br>\"firstName\": \"" + eElement.getAttribute("firstName")+ "\",");
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// returnData.append("<br>\"lastName\": \"" + eElement.getAttribute("lastName")+ "\"");
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//
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JSONObject json = new JSONObject();
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json.put("id", Integer.parseInt(eElement.getAttribute("id")));
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json.put("firstName", eElement.getAttribute("firstName"));
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json.put("lastName", eElement.getAttribute("lastName"));
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list.add(json);
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}
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}
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}
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returnData.append(list.toString());
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} else if(action.equals("searchByFirstName")) {
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for (int temp = 0; temp < nList.getLength(); temp++) {
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Node nNode = nList.item(temp);
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if (nNode.getNodeType() == Node.ELEMENT_NODE) {
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Element eElement = (Element) nNode;
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if(eElement.getAttribute("firstName").equals(firstName)) {
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JSONObject json = new JSONObject();
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json.put("id", Integer.parseInt(eElement.getAttribute("id")));
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json.put("firstName", eElement.getAttribute("firstName"));
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json.put("lastName", eElement.getAttribute("lastName"));
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list.add(json);
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}
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}
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}
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returnData.append(list.toString());
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} else if(action.equals("searchByLastName")) {
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for (int temp = 0; temp < nList.getLength(); temp++) {
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Node nNode = nList.item(temp);
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if (nNode.getNodeType() == Node.ELEMENT_NODE) {
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Element eElement = (Element) nNode;
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if(eElement.getAttribute("lastName").equals(lastName)) {
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JSONObject json = new JSONObject();
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json.put("id", Integer.parseInt(eElement.getAttribute("id")));
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json.put("firstName", eElement.getAttribute("firstName"));
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json.put("lastName", eElement.getAttribute("lastName"));
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list.add(json);
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}
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}
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}
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returnData.append(list.toString());
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} else if(action.equals("searchByIdRange")) {
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if(high >= Integer.valueOf(root.getAttribute("id_auto_increment")) && low<1) return "";
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for (int temp = 0; temp < nList.getLength(); temp++) {
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Node nNode = nList.item(temp);
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if (nNode.getNodeType() == Node.ELEMENT_NODE) {
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Element eElement = (Element) nNode;
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if(Integer.parseInt(eElement.getAttribute("id").trim()) >=low && Integer.parseInt(eElement.getAttribute("id").trim()) <=high) {
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JSONObject json = new JSONObject();
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json.put("firstName", eElement.getAttribute("firstName"));
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json.put("lastName", eElement.getAttribute("lastName"));
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json.put("id", Integer.parseInt(eElement.getAttribute("id")));
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list.add(json);
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}
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}
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}
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returnData.append(list.toString());
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} else if(action.equals("updateUser")) {
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for (int temp = 0; temp < nList.getLength(); temp++) {
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Node nNode = nList.item(temp);
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if (nNode.getNodeType() == Node.ELEMENT_NODE) {
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Element eElement = (Element) nNode;
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if(Integer.parseInt(eElement.getAttribute("id").trim()) ==id) {
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if(returnData.toString().equals("")) {
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returnData.append("[{");
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}
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else {
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returnData.append("<br>},{");
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}
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eElement.setAttribute("firstName", firstName);
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eElement.setAttribute("lastName", lastName);
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TransformerFactory transformerFactory = TransformerFactory.newInstance();
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Transformer transformer = transformerFactory.newTransformer();
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DOMSource source = new DOMSource(doc);
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// Path currentRelativePath = Paths.get("");
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// String s = currentRelativePath.toAbsolutePath().toString()+"/data.xml";
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StreamResult result = new StreamResult(new File(path.getFile()));
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transformer.transform(source, result);
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}
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}
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}
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} else if(action.equals("insertUser")) {
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Element user = doc.createElement("user");
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root.appendChild(user);
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user.setAttribute("id", root.getAttribute("id_auto_increment"));
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user.setAttribute("firstName", firstName);
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user.setAttribute("lastName", lastName);
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root.setAttribute("id_auto_increment", String.valueOf(Integer.valueOf(root.getAttribute("id_auto_increment"))+1));
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TransformerFactory transformerFactory = TransformerFactory.newInstance();
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Transformer transformer = transformerFactory.newTransformer();
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DOMSource source = new DOMSource(doc);
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// Path currentRelativePath = Paths.get("");
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// String s = currentRelativePath.toAbsolutePath().toString()+"/data.xml";
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StreamResult result = new StreamResult(new File(path.getFile()));
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transformer.transform(source, result);
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} else {
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return "";
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}
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return returnData.toString();
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} catch (Exception e) {
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System.out.println("Something went wrong");
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e.printStackTrace();
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}
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return "";
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}
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}
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