inital

src/com/xeiam/examples/ChartServletExample.java

+/**
+ * Copyright 2011 Xeiam LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.xeiam.examples;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+import javax.servlet.ServletException;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import com.xeiam.xcharts.BitmapEncoder;
+import com.xeiam.xcharts.Chart;
+import com.xeiam.xcharts.QuickChart;
+
+/**
+ * Generates, stores, and serves charts
+ * 
+ * @author timmolter
+ */
+@javax.servlet.annotation.WebServlet(name = "ChartServlet", urlPatterns = { "/chart" }, asyncSupported = true)
+public class ChartServletExample extends HttpServlet {
+
+    private static Map<String, Chart> chartMap = new HashMap<String, Chart>();
+
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException {
+
+        String id = request.getParameter("id");
+
+        Chart chart = chartMap.get(id);
+
+        response.setContentType("image/png");
+        ServletOutputStream out = response.getOutputStream();
+
+        try {
+            BitmapEncoder.streamPNG(out, chart);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        out.close();
+
+        chart = null;
+
+        chartMap.remove(id);
+    }
+
+    /**
+     * Generates a chart and puts it in chartMap
+     * 
+     * @return UUID uniquely identifying chart in the chartMap
+     */
+    public static String generateDummyChart() {
+
+        Chart chart = QuickChart.getChart("Sample Chart", "X", "Y", null, null, new double[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 });
+        String uuid = UUID.randomUUID().toString();
+        chartMap.put(uuid, chart);
+
+        return uuid;
+    }
+}