实验3Ajax发送JSON请求.docVIP

实验三 Ajax发送JSON请求 实验目的: 掌握JSON的概念 掌握Ajax发送JSON数据 1.新建web项目testservlet 搭建平台：引入java-json.jar包，Java语言解析JSON的API；引入json.js框架，提供一些方法，在页面中使用javascript方便访问JOSN对象； 2.创建一个HttpServlet类JSONExample package json.servlet; import java.io. * ; import . * ; import java.text.ParseException; import javax.servlet. * ; import javax.servlet.http. * ; import org.json.JSONException; import org.json.JSONObject; public class JSONExample extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String json = readJSONStringFromRequestBody(request); // Use the JSON-Java binding library to create a JSON object in Java JSONObject jsonObject = null ; try { jsonObject = new JSONObject(json); } catch (JSONException pe) { System.out.println( ParseException: + pe.toString()); } catch (Exception e) { e.printStackTrace(); } String responseText=; try { responseText = You have a + jsonObject.getInt( year ) + + jsonObject.getString( make ) + + jsonObject.getString( model ) + + that is + jsonObject.getString( color ) + in color. ; } catch (Exception e) { e.printStackTrace(); } response.setContentType( text/xml ); response.getWriter().print(responseText); } private String readJSONStringFromRequestBody(HttpServletRequest request) { StringBuffer json = new StringBuffer(); String line = null ; try { BufferedReader reader = request.getReader(); while ((line = reader.readLine()) != null ) { json.append(line); } } catch (Exception e) { System.out.println( Error reading JSON string: + e.toString()); } return json.toS