Статьи

Restlet Framework — Пример Hello World

Январь 24, 2019

Restlet — это легкая, всеобъемлющая среда REST с открытым исходным кодом для платформы Java. Рестлет подходит как для серверных, так и для клиентских веб-приложений. Он поддерживает основные стандарты интернет-транспорта, формата данных и описания услуг, такие как HTTP и HTTPS, SMTP, XML, JSON, Atom и WADL. Порт GWT библиотеки на стороне клиента также доступен. (Ссылка: http://en.wikipedia.org/wiki/Restlet)

Пример Hello World

  • Структура проекта

Selection_021

  • RestletApplication.java
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package com.restlet.demo.application;
 
import org.restlet.Application;
import org.restlet.Restlet;
import org.restlet.routing.Router;
 
import com.restlet.demo.resource.HelloWorldResource;
 
public class RestletApplication extends Application{
    public synchronized Restlet createInboundRoot() {
        Router router = new Router(getContext());
        router.attach("/helloWorld",HelloWorldResource.class );
        return router;
    }
}
  • ResponseParseFactory.java
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package com.restlet.demo.core;
 
import java.util.LinkedHashMap;
 
import org.apache.log4j.Logger;
import org.json.simple.JSONValue;
 
public class ResponseParseFactory {
 
 static Logger logger = Logger.getLogger(ResponseParseFactory.class);
 
 @SuppressWarnings({ "rawtypes", "unchecked" })
 public String getFailureJsonString(String msg){
  String jsonString = "";
  LinkedHashMap list = new LinkedHashMap();
  list.put("response_status", "false");
 
  list.put("result", msg+"");
  jsonString = JSONValue.toJSONString(list);
  logger.info(jsonString);
  return jsonString;
 }
 
 @SuppressWarnings({ "rawtypes", "unchecked" })
 public String getSuccessJsonString(String msg){
  String jsonString = "";
  LinkedHashMap list = new LinkedHashMap();
  list.put("response_status","true");
 
  list.put("result", msg);
  jsonString = JSONValue.toJSONString(list);
  logger.info(jsonString);
  return jsonString;
 }
}
  • BaseResource.java
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package com.restlet.demo.resource;
 
import java.util.HashMap;
import java.util.Map;
 
import org.apache.log4j.Logger;
import org.json.JSONObject;
import org.json.simple.parser.JSONParser;
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Parameter;
import org.restlet.ext.json.JsonRepresentation;
import org.restlet.representation.Representation;
import org.restlet.representation.StringRepresentation;
import org.restlet.resource.Get;
import org.restlet.resource.Post;
import org.restlet.resource.ServerResource;
 
import com.restlet.demo.core.ResponseParseFactory;
 
public abstract class BaseResource extends ServerResource{
 
  protected ResponseParseFactory parseFactory = null;
  protected Logger logger = Logger.getLogger(BaseResource.class);
  String jsonString="";
 
 @SuppressWarnings("rawtypes")
 @Post("json")
 public Representation doPost(Representation entity){
  Map json =null;
  jsonString = "";
  parseFactory = new ResponseParseFactory();
  try {
   JsonRepresentation represent = new JsonRepresentation(entity);
   JSONObject jsonobject = represent.getJsonObject();
   JSONParser parser = new JSONParser();
   String jsonText = jsonobject.toString();
   json = (Map) parser.parse(jsonText);
   jsonString = processRequest(json,"post");
  } catch (Exception e) {
   e.printStackTrace();
   jsonString = parseFactory.getFailureJsonString(e.getMessage());
  }
  return new StringRepresentation(jsonString, MediaType.APPLICATION_JSON);
 }
 
 @SuppressWarnings("rawtypes")
 @Get
 public Representation doGet(){
  Map json =null;
  parseFactory = new ResponseParseFactory();
  jsonString = "";
  try {
   json = getMapFromParam(getRequest().getResourceRef().getQueryAsForm());
   parseFactory = new ResponseParseFactory();
   jsonString = processRequest(json,"get");
 
  } catch (Exception e) {
   e.printStackTrace();
   jsonString = parseFactory.getFailureJsonString(e.getMessage());
  }
  return new StringRepresentation(jsonString, MediaType.APPLICATION_JSON);
 }
 
 public abstract String processRequest(Map json,String method);
 
 public static Map<String, String> getMapFromParam(Form form) {
  Map<String, String> map = new HashMap<String, String>();
  for (Parameter parameter : form) {
   map.put(parameter.getName(), parameter.getValue());
  }
  return map;
 }
 
}
  • HelloWorldResource.java
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package com.restlet.demo.resource;
 
import java.util.Map;
 
import com.restlet.demo.core.ResponseParseFactory;
 
public class HelloWorldResource extends BaseResource {
 
 public String processRequest(Map json, String method) {
  String returnString = "" ;
  returnString = new ResponseParseFactory().getSuccessJsonString("Hello " + json.get("user"));
  return returnString;
 }
}
  • log4j.properties
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# -----------------------------
# Appender to write to console.
# -----------------------------
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
log4j.appender.CONSOLE.file =${catalina.base}/logs/regularLogging.log
log4j.appender.CONSOLE.MaxFileSize=100KB
 
# ---------------------------------------------
# Appender to write to application log.
# ---------------------------------------------
log4j.appender.APPLICATIONLOG=org.apache.log4j.DailyRollingFileAppender
log4j.appender.APPLICATIONLOG.File=${catalina.base}/logs/restlet-demo.log
log4j.appender.APPLICATIONLOG.DatePattern='.'yyyy-MM-dd
#log4j.appender.APPLICATIONLOG.File=/home/devphp/public_html/restletframework/logs/APPLICATION-LOG.log
log4j.appender.APPLICATIONLOG.Encoding=UTF-8
log4j.appender.APPLICATIONLOG.layout=org.apache.log4j.PatternLayout
log4j.appender.APPLICATIONLOG.layout.ConversionPattern=%d [%5p]: %m%n
 
# Turn off root logging.
#log4j.rootLogger=info, APPLICATIONLOG
log4j.rootLogger=info, CONSOLE , APPLICATIONLOG
  • web.xml
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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>RestletDemo</display-name>
 <servlet>
  <servlet-name>RestletServlet</servlet-name>
  <servlet-class>org.restlet.ext.servlet.ServerServlet</servlet-class>
  <init-param>
   <param-name>org.restlet.application</param-name>
   <param-value>com.restlet.demo.application.RestletApplication</param-value>
  </init-param>
 </servlet>
 <servlet-mapping>
  <servlet-name>RestletServlet</servlet-name>
  <url-pattern>/service/*</url-pattern>
 </servlet-mapping>
</web-app>

 

  • Вызов веб-службы Hello World

Selection_022

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