Restlet框架– Hello World示例

Restlet是用于Java平台的轻量级，全面的开源REST框架。 Restlet适用于服务器和客户端Web应用程序。 它支持主要的Internet传输，数据格式和服务描述标准，例如HTTP和HTTPS，SMTP，XML，JSON，Atom和WADL。 客户端库的GWT端口也可用。 （参考：http：//en.wikipedia.org/wiki/Restlet）

你好世界的例子

• 项目结构

• RestletApplication.java

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

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

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

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

# -----------------------------
# 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

<?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>

• 呼叫Hello World Web服务

翻译自: https://www.javacodegeeks.com/2013/09/restlet-framework-hello-world-example.html