Наметки rest api

- задействован SpringMVC;
- определены обработчики 404-й и 500-й ошибок.

ks.server/src/main/java/ks/server/Main.java

@@ -1,10 +0,0 @@
-package ks.server;
-
-import lombok.extern.slf4j.Slf4j;
-
-@Slf4j
-public class Main {
-    public static void main(String[] args) {
-        log.info("KinoSearch - Server");
-    }
-}

ks.server/src/main/java/ks/server/SpringConfigMVC.java

@@ -0,0 +1,20 @@
+package ks.server;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.json.GsonHttpMessageConverter;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+import java.util.List;
+
+@Configuration
+@ComponentScan({ "ks.server.controllers" })
+@EnableWebMvc
+public class SpringConfigMVC implements WebMvcConfigurer {
+    @Override
+    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
+        converters.add(new GsonHttpMessageConverter());
+    }
+}

ks.server/src/main/java/ks/server/WebApplication.java

@@ -0,0 +1,100 @@
+package ks.server;
+
+import ks.server.controllers.ErrorPageController;
+import ks.server.controllers.WebController;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.eclipse.jetty.server.ConnectionFactory;
+import org.eclipse.jetty.server.Connector;
+import org.eclipse.jetty.server.HttpConnectionFactory;
+import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.servlet.ErrorPageErrorHandler;
+import org.eclipse.jetty.servlet.ServletContextHandler;
+import org.eclipse.jetty.servlet.ServletHolder;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Slf4jLog;
+import org.springframework.web.context.ContextLoaderListener;
+import org.springframework.web.context.WebApplicationContext;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+import org.springframework.web.servlet.DispatcherServlet;
+
+import java.net.InetSocketAddress;
+
+@Slf4j
+@RequiredArgsConstructor
+public class WebApplication {
+    private final String host;
+    private final int port;
+
+    private DispatcherServlet getDispatcherServlet(WebApplicationContext context) {
+        DispatcherServlet dispatcherServlet = new DispatcherServlet(context);
+        dispatcherServlet.setThrowExceptionIfNoHandlerFound(true);
+        return dispatcherServlet;
+    }
+
+    private ErrorPageErrorHandler getErrorHandler() {
+        ErrorPageErrorHandler errorHandler = new ErrorPageErrorHandler();
+        errorHandler.addErrorPage(500, "/err500");
+        return errorHandler;
+    }
+
+    /**
+     * Подготавливаем обработчик запросов
+     *
+     * @param context Spring-контекст веб-приложения {@link WebApplicationContext}
+     * @return {@link ServletContextHandler}
+     */
+    private ServletContextHandler getServletContextHandler(WebApplicationContext context) {
+        ServletContextHandler contextHandler = new ServletContextHandler();
+        contextHandler.setContextPath("/");
+        contextHandler.setErrorHandler(getErrorHandler());
+        contextHandler.addServlet(new ServletHolder(getDispatcherServlet(context)), "/*");
+        contextHandler.addEventListener(new ContextLoaderListener(context));
+        return contextHandler;
+    }
+
+    /**
+     * Создаем Spring-контекст
+     *
+     * @return {@link WebApplicationContext}
+     */
+    private WebApplicationContext getWebApplicationContext() {
+        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
+        context.register(SpringConfigMVC.class);
+        return context;
+    }
+
+    /**
+     * Запуск встроенного веб-сервера
+     */
+    private void start() {
+        Log.setLog(new Slf4jLog("Jetty.Logger"));
+
+        Server jettyServer = new Server(new InetSocketAddress(host, port));
+        for (Connector connector : jettyServer.getConnectors()) {
+            for (ConnectionFactory factory : connector.getConnectionFactories()) {
+                if (factory instanceof HttpConnectionFactory) {
+                    ((HttpConnectionFactory)factory).getHttpConfiguration().setSendServerVersion(false);
+                }
+            }
+        }
+
+        jettyServer.setHandler(getServletContextHandler(getWebApplicationContext()));
+
+        try {
+            jettyServer.start();
+            jettyServer.join();
+        } catch (Exception e) {
+            log.error("Error start server", e);
+        }
+    }
+
+    public static void main(String[] args) {
+        final String host = System.getProperty("host", "127.0.0.1");
+        final int port = Integer.parseInt(System.getProperty("port", "8080"));
+
+        log.info("Server listen {}:{}", host, port);
+        WebApplication webApplication = new WebApplication(host, port);
+        webApplication.start();
+    }
+}

ks.server/src/main/java/ks/server/controllers/ErrorPageController.java

@@ -0,0 +1,47 @@
+package ks.server.controllers;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.servlet.NoHandlerFoundException;
+
+import javax.servlet.ServletException;
+import java.util.HashMap;
+import java.util.Map;
+
+@ControllerAdvice
+@RequestMapping(produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
+@ResponseBody
+public class ErrorPageController {
+
+    private Map<String, String> createErrorMap(HttpStatus httpStatus) {
+        return createErrorMap(httpStatus.value(), httpStatus.getReasonPhrase());
+    }
+
+    private Map<String, String> createErrorMap(int code, String message) {
+        Map<String, String> map = new HashMap<>();
+
+        map.put("error", String.valueOf(code));
+        map.put("errorMessage", message);
+
+        return map;
+    }
+
+    @ExceptionHandler(NoHandlerFoundException.class)
+    @ResponseStatus(HttpStatus.NOT_FOUND)
+    public Map<String, String> handleNotFound() {
+        return createErrorMap(HttpStatus.NOT_FOUND);
+    }
+
+    @ExceptionHandler(ServletException.class)
+    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
+    public Map<String, String> handleUnexceptedError() {
+        return createErrorMap(-1, "Unexcepted error");
+    }
+
+    @RequestMapping(path = "/err500", method = RequestMethod.GET)
+    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
+    public Map<String, String> handleInternalError() {
+        return createErrorMap(HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+}

ks.server/src/main/java/ks/server/controllers/WebController.java

@@ -0,0 +1,21 @@
+package ks.server.controllers;
+
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import java.util.Collections;
+import java.util.Map;
+
+@Controller
+@RequestMapping(path = "/", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
+@ResponseBody
+public class WebController {
+
+    @RequestMapping(method = RequestMethod.GET)
+    public Map<String, String> index() {
+        return Collections.singletonMap("message", "hello?");
+    }
+}

ks.server/src/main/resources/log4j2.xml

@@ -6,8 +6,10 @@
         </Console>
     </Appenders>
     <Loggers>
-        <Root level="all">
+        <Root level="warn">
             <AppenderRef ref="Console"/>
         </Root>
+        <Logger name="ks.server" level="info"/>
+        <Logger name="org.springframework.web.servlet.PageNotFound" level="error"/>
     </Loggers>
 </Configuration>