Json api and web service solution

json-api-and-web-service-solution/README.md

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+Hi,
+
+
+## Implementation plan
+
+* Create rest api aplication
+* Add JQuery for send/get data in JSON format
+* Implement expression calculation
+* Catch all possible exceptions
+* Integrate with Travis CI
+* Make some refac/add test/finally review
+
+## User guide

json-api-and-web-service-solution/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>json.api.and.web.service.solution</groupId>
+	<artifactId>JsonApiAndWebServiceSolution</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>war</packaging>
+
+	<properties>
+		<spring.version>4.3.10.RELEASE</spring.version>
+	</properties>
+
+	<dependencies>
+		<!-- Spring -->
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-webmvc</artifactId>
+			<version>${spring.version}</version>
+		</dependency>
+
+		<!-- Servlet -->
+		<dependency>
+			<groupId>javax.servlet</groupId>
+			<artifactId>javax.servlet-api</artifactId>
+			<version>3.1.0</version>
+		</dependency>
+		<dependency>
+			<groupId>javax.servlet.jsp</groupId>
+			<artifactId>jsp-api</artifactId>
+			<version>2.2</version>
+		</dependency>
+		<dependency>
+			<groupId>javax.servlet</groupId>
+			<artifactId>jstl</artifactId>
+			<version>1.2</version>
+		</dependency>
+
+		<!-- Jackson -->
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+			<version>2.9.0</version>
+		</dependency>
+
+	</dependencies>
+
+
+	<build>
+		<pluginManagement>
+			<plugins>
+				<plugin>
+					<artifactId>maven-compiler-plugin</artifactId>
+					<version>3.5.1</version>
+					<configuration>
+						<source>1.8</source>
+						<target>1.8</target>
+					</configuration>
+				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-war-plugin</artifactId>
+					<version>3.1.0</version>
+					<configuration>
+						<warSourceDirectory>src/main/webapp</warSourceDirectory>
+						<warName>JsonApiAndWebServiceSolution</warName>
+						<failOnMissingWebXml>false</failOnMissingWebXml>
+					</configuration>
+				</plugin>
+			</plugins>
+		</pluginManagement>
+	</build>
+
+</project>

json-api-and-web-service-solution/src/main/java/job/interview/exercises/config/AppConfig.java

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+package job.interview.exercises.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.ViewResolver;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.servlet.view.InternalResourceViewResolver;
+import org.springframework.web.servlet.view.JstlView;
+
+@Configuration
+@EnableWebMvc
+@ComponentScan(basePackages = "job.interview.exercises")
+public class AppConfig extends WebMvcConfigurerAdapter {
+
+	@Bean
+	public ViewResolver viewResolver() {
+		final InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
+		viewResolver.setViewClass(JstlView.class);
+		viewResolver.setPrefix("/WEB-INF/views/");
+		viewResolver.setSuffix(".jsp");
+
+		return viewResolver;
+	}
+
+	@Override
+	public void addResourceHandlers(ResourceHandlerRegistry registry) {
+		registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
+	}
+
+}

json-api-and-web-service-solution/src/main/java/job/interview/exercises/config/AppInit.java

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+package job.interview.exercises.config;
+
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+public class AppInit extends AbstractAnnotationConfigDispatcherServletInitializer {
+
+	@Override
+	protected Class<?>[] getRootConfigClasses() {
+		return new Class[] { AppConfig.class };
+	}
+
+	@Override
+	protected Class<?>[] getServletConfigClasses() {
+		return null;
+	}
+
+	@Override
+	protected String[] getServletMappings() {
+		return new String[] { "/" };
+	}
+
+}

json-api-and-web-service-solution/src/main/java/job/interview/exercises/controller/AppController.java

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+package job.interview.exercises.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.servlet.ModelAndView;
+
+import job.interview.exercises.service.AppService;
+
+@Controller
+public class AppController {
+
+	@Autowired
+	@Qualifier("AppService")
+	AppService appService;
+
+	@RequestMapping(value = "/")
+	public ModelAndView main() {
+
+		final ModelAndView mav = new ModelAndView("main");
+		mav.addObject("test", appService.getMsg());
+
+		return mav;
+	}
+
+}

json-api-and-web-service-solution/src/main/java/job/interview/exercises/controller/rest/AppRestController.java

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+package job.interview.exercises.controller.rest;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import job.interview.exercises.model.Result;
+import job.interview.exercises.service.AppService;
+
+@RestController
+@RequestMapping(value = "/rest")
+public class AppRestController {
+
+	@Autowired
+	@Qualifier("AppService")
+	AppService appService;
+
+	@RequestMapping(value = "/calculateExpression", method = RequestMethod.POST, produces = "application/json")
+	public Result getTestInJSON(@RequestBody String expression) {
+
+		final Result calculatedExpression = appService.calculateExpression(expression);
+		return calculatedExpression;
+	}
+
+}

json-api-and-web-service-solution/src/main/java/job/interview/exercises/model/Result.java

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+package job.interview.exercises.model;
+
+import java.io.Serializable;
+
+public class Result implements Serializable {
+
+	private static final long serialVersionUID = -4902676973289000860L;
+
+	private String result;
+
+	public String getResult() {
+		return result;
+	}
+
+	public void setResult(String result) {
+		this.result = result;
+	}
+
+	@Override
+	public String toString() {
+		return "Result [result=" + result + "]";
+	}
+
+}

json-api-and-web-service-solution/src/main/java/job/interview/exercises/service/AppService.java

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+package job.interview.exercises.service;
+
+import job.interview.exercises.model.Result;
+
+public interface AppService {
+
+	String getMsg();
+
+	Result calculateExpression(String expression);
+
+}

json-api-and-web-service-solution/src/main/java/job/interview/exercises/service/AppServiceImpl.java

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+package job.interview.exercises.service;
+
+import org.springframework.stereotype.Service;
+
+import job.interview.exercises.model.Result;
+
+@Service("AppService")
+public class AppServiceImpl implements AppService {
+
+	@Override
+	public String getMsg() {
+		return "Test msg";
+	}
+
+	@Override
+	public Result calculateExpression(String expression) {
+		final Result result = new Result();
+		result.setResult(expression + " test");
+
+		return result;
+	}
+
+}

json-api-and-web-service-solution/src/main/webapp/WEB-INF/views/main.jsp

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+<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
+<%@taglib prefix="spring" uri="http://www.springframework.org/tags"%>
+<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+
+<c:url var="home" value="/" scope="request" />
+<spring:url value="resources/css/style.css" var="coreCss" />
+<spring:url value="resources/css/bootstrap.min.css" var="bootstrapCss" />
+
+<meta charset="utf-8">
+<meta http-equiv="X-UA-Compatible" content="IE=edge">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="description" content="JSON API WS">
+<meta name="author" content="Alex">
+
+<title>JSON API WS</title>
+
+<link href="${bootstrapCss}" rel="stylesheet">
+<link href="${coreCss}" rel="stylesheet">
+</head>
+
+<body>
+
+	<div class="container">
+
+		<div class="central-block">
+
+			<div id="feedback"></div>
+
+			<form class="form-horizontal" id="search-form">
+				<div class="form-group form-group-lg">
+					<label class="col-sm-2 control-label">Expression</label>
+					<div class="col-sm-10">
+						<input type=text class="form-control" id="expression">
+					</div>
+				</div>
+
+				<div class="form-group">
+					<div class="col-sm-offset-2 col-sm-10">
+						<button type="submit" id="bth-search"
+							class="btn btn-primary btn-lg">Calculate</button>
+					</div>
+				</div>
+			</form>
+		</div>
+
+	</div>
+
+	<script src="resources/js/jquery-3.2.1.min.js"></script>
+	<script src="resources/js/bootstrap.min.js"></script>
+	<script src="resources/js/script.js"></script>
+
+	<script>
+		jQuery(document).ready(function($) {
+
+			$("#search-form").submit(function(event) {
+				enableSearchButton(false);
+				event.preventDefault();
+				searchViaAjax();
+			});
+
+		});
+
+		function searchViaAjax() {
+			var expression = $("#expression").val();
+
+			$.ajax({
+				type : "POST",
+				contentType : "application/json",
+				url : "/JsonApiAndWebServiceSolution/rest/calculateExpression",
+				data: expression,
+				dataType : 'json',
+				timeout : 100000,
+				success : function(data) {
+					console.log("SUCCESS: ", data);
+					display(data);
+				},
+				error : function(e) {
+					console.log("ERROR: ", e);
+					display(e);
+				},
+				done : function(e) {
+					console.log("DONE");
+					enableSearchButton(true);
+				}
+			});
+
+		}
+
+		function enableSearchButton(flag) {
+			$("#btn-search").prop("disabled", flag);
+		}
+
+		function display(data) {
+			var json = "<h4>Response</h4><pre>" + JSON.stringify(data, null, 4) + "</pre>";
+			$('#feedback').html(json);
+		}
+	</script>
+
+</body>
+</html>