com.google.apphosting.runtime.jetty9.jspexample.HelloAppEngine Maven / Gradle / Ivy

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/*
 * Copyright 2021 Google 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
 *
 *     https://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.google.apphosting.runtime.jetty9.jspexample;

import static com.google.common.base.StandardSystemProperty.JAVA_VERSION;
import static com.google.common.base.StandardSystemProperty.OS_NAME;
import static com.google.common.base.StandardSystemProperty.USER_NAME;

import com.google.appengine.api.utils.SystemProperty;
import java.io.IOException;
import java.util.Properties;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** Trivial servlet, with a public method called from JSP. */
public class HelloAppEngine extends HttpServlet {

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    Properties properties = System.getProperties();

    response.setContentType("text/plain");
    response.getWriter().println("Hello App Engine - Standard using "
            + SystemProperty.version.get() + " Java "
            + properties.get("java.specification.version"));
  }

  /** Method called from JSP. */
  public static String getInfo() {
    return "Version: "
        + JAVA_VERSION.value()
        + " OS: "
        + OS_NAME.value()
        + " User: "
        + USER_NAME.value();
  }
}