ResourceHandlingApplication.java

/*
 * Copyright 2012-2017 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 com.example;

import java.io.IOException;
import java.net.URL;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.system.EmbeddedServerPortFileWriter;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

/**
 * Test application for verifying an embedded container's static resource handling.
 *
 * @author Andy Wilkinson
 */
@SpringBootApplication
public class ResourceHandlingApplication {

	public static void main(String[] args) {
		new SpringApplicationBuilder(ResourceHandlingApplication.class)
				.properties("server.port:0")
				.listeners(new EmbeddedServerPortFileWriter("target/server.port"))
				.run(args);
	}

	@Bean
	public ServletRegistrationBean<?> resourceServletRegistration() {
		ServletRegistrationBean<?> registration = new ServletRegistrationBean<HttpServlet>(
				new HttpServlet() {

					@Override
					protected void doGet(HttpServletRequest req, HttpServletResponse resp)
							throws ServletException, IOException {
						URL resource = getServletContext()
								.getResource(req.getQueryString());
						if (resource == null) {
							resp.sendError(404);
						}
						else {
							resp.getWriter().println(resource);
							resp.getWriter().flush();
						}
					}

				});
		registration.addUrlMappings("/servletContext");
		return registration;
	}

}