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Les Vogel
committed
Add a more complex example as well.
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-16
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+109
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‎appengine/urlfetch/src/main/java/com/example/appengine/UrlFetchServlet.java

Lines changed: 61 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -18,40 +18,85 @@
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import org.json.JSONObject;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.net.URL;
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import javax.servlet.ServletException;
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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 java.io.*;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.net.URLEncoder;
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@SuppressWarnings("serial")
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public class UrlFetchServlet extends HttpServlet {
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@Override
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public void doGet(HttpServletRequest req, HttpServletResponse resp)
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throws IOException {
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PrintWriter out = resp.getWriter();
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out.println("<html><body>");
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throws IOException, ServletException {
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// [START example]
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URL url = new URL("http://api.icndb.com/jokes/random");
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BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
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String json = "";
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StringBuffer json = new StringBuffer();
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String line;
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while ((line = reader.readLine()) != null) {
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json += line;
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json.append(line);
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}
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reader.close();
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// [END example]
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JSONObject jo = new JSONObject(json);
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out.println("<h2>"
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+ jo.getJSONObject("value").getString("joke")
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+ "</h2>");
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out.println("</body></html>");
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JSONObject jo = new JSONObject(json.toString());
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req.setAttribute("joke", jo.getJSONObject("value").getString("joke"));
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req.getRequestDispatcher("/main.jsp").forward(req, resp);
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}
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@Override
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public void doPost(HttpServletRequest req, HttpServletResponse resp)
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throws IOException, ServletException {
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String id = req.getParameter("id");
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String text = req.getParameter("text");
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if (id == null || text == null || id == "" || text == "") {
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req.setAttribute("error", "invalid input");
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req.getRequestDispatcher("/main.jsp").forward(req,resp);
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return;
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}
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JSONObject jsonObj = new JSONObject()
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.put("userId", 33)
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.put("id", id)
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.put("title", text)
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.put("body", text);
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// [START complex]
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URL url = new URL("http://jsonplaceholder.typicode.com/posts/"+id);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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conn.setDoOutput(true);
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conn.setRequestMethod("PUT");
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OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
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writer.write(URLEncoder.encode(jsonObj.toString(), "UTF-8"));
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writer.close();
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int respCode = conn.getResponseCode(); // New items get NOT_FOUND on PUT
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if (respCode == HttpURLConnection.HTTP_OK || respCode == HttpURLConnection.HTTP_NOT_FOUND) {
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req.setAttribute("error", "" );
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StringBuffer response = new StringBuffer();
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String line;
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BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
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while ((line = reader.readLine()) != null) {
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response.append(line);
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}
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reader.close();
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req.setAttribute("response", response.toString());
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} else {
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req.setAttribute("error", conn.getResponseCode()+" "+conn.getResponseMessage());
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}
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// [END complex]
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req.getRequestDispatcher("/main.jsp").forward(req, resp);
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}
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}

‎appengine/urlfetch/src/main/webapp/main.jsp

Lines changed: 48 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,48 @@
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<%--
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Copyright 2016 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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--%>
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<!DOCTYPE html>
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<!-- [START base] -->
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<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
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<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
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<html lang="en">
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<head>
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<title>URL Fetch sample</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
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<body>
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<h1 align="center">URL Fetch Sample</h1>
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<c:if test="${not empty joke}">
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<h2>Joke: ${joke}</h2>
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</c:if>
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<p /><p />
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<c:if test="${not empty error}">
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<h2>${error}</h2>
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</c:if>
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<p />
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<c:if test="${not empty response}">${response}</c:if>
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<p />
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<p>
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<form method="post">
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<label for="id">&nbsp;&nbsp;ID:</label><input type="text" name="id" value="777"/><br />
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<label for="text">Text:</label><input type="text" name="text" value="Lorem ipsum dolor sit amet, consectetur adipiscing elit."/><br />
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<input type="submit" value="Send"/>
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</form>
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</p>
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<c:if test="">
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</c:if>
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</body>
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</html>
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<!-- [END base]-->

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