org.cloudfoundry.samples.handson.ex4.EnvVariablesController.java Source code

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Here is the source code for org.cloudfoundry.samples.handson.ex4.EnvVariablesController.java

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/*
 * Copyright 2012 the original author or authors.
 *
 * 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 org.cloudfoundry.samples.handson.ex4;

import java.io.PrintWriter;
import java.util.Map;
import java.util.Map.Entry;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class EnvVariablesController {

    /**
     * Use the out variable to dump the contents of the environment variables.
     * 
     * Notice how CloudFoundry instructs the app about services it provides
     * inside variables named {@code VCAP_something}.
     */
    @RequestMapping("/ex4")
    public void dump(HttpServletResponse response) throws Exception {
        @SuppressWarnings("unused")
        PrintWriter out = response.getWriter();

        Map<String, String> env = System.getenv();
        for (Entry<String, String> envi : env.entrySet()) {
            out.write(envi.getKey() + " => " + envi.getValue() + "\n");
        }

        // ...
    }

}