<?xml version="1.0" encoding="UTF-8"?>
<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>com.packtpub.mmj.restsample</groupId><artifactId>restsample</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>restsample</name><description>com.packtpub.mmj.restsample</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-tomcat</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jetty</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

package com.packtpub.mmj.restsample.model;
import java.util.List;public class Calculation {String funciton;private List<String> input;private List<String> output;public Calculation(List<String> input, List<String> output, String function) {this.funciton = function;this.input = input;this.output = output;}public String getFunciton() {return funciton;}public void setFunciton(String funciton) {this.funciton = funciton;}public List<String> getInput() {return input;}public void setInput(List<String> input) {this.input = input;}public List<String> getOutput() {return output;}public void setOutput(List<String> output) {this.output = output;}}

package com.packtpub.mmj.restsample.resources;import com.packtpub.mmj.restsample.model.Calculation;
import java.util.ArrayList;
import java.util.List;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import static org.springframework.web.bind.annotation.RequestMethod.GET;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/calculation")
public class CalculationController {private static final String PATTERN = "^-?+\\d+\\.?+\\d*$";@RequestMapping("/power")public Calculation pow(@RequestParam(value="base") String b, @RequestParam(value="exponent") String e) {List<String> input = new ArrayList<String>();input.add(b);input.add(e);List<String> output = new ArrayList<String>();String powValue = "";if (b!=null && e!=null && b.matches(PATTERN) && e.matches(PATTERN)) {powValue = String.valueOf(Math.pow(Double.valueOf(b), Double.valueOf(e)));} else {powValue = "input is error";}output.add(powValue);return new Calculation(input, output, "power");}@RequestMapping(value="/sqrt/{value:.+}", method=GET)public Calculation sqrt(@PathVariable(value="value") String aValue) {List<String> input = new ArrayList<String>();input.add(aValue);List<String> output = new ArrayList<String>();String sqrtValue = "";if (aValue!=null && aValue.matches(PATTERN) ) {sqrtValue = String.valueOf(Math.sqrt(Double.valueOf(aValue)));} else {sqrtValue = "input is error";}output.add(sqrtValue);return new Calculation(input, output, "sqrt");}}

package com.packtpub.mmj.restsample;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class RestsampleApplication {public static void main(String[] args) {SpringApplication.run(RestsampleApplication.class, args);}
}