Gson and Spark demo

Initial.java

import com.google.gson.Gson;
import com.katkam.entity.Organization;
import com.katkam.entity.Part;

/**
 * Created by Developer on 6/12/17.
 */
public class Initial {
    public static void main(String args[]) {
        Gson gson = new Gson();

//        final String abcd = gson.toJson("abcd");
//        System.out.println(abcd);
//        gson.fromJson("abcd", String.class);

        Part p = new Part();
        p.partCode = "A001";
        p.setDescription("Part 1 A");
        p.org = new Organization("XYZ", "Some Corporation");

        System.out.println( gson.toJson(p) );

//        Part q = gson.fromJson("{\"partCode\":\"A001\",\"description\":\"Part 1 A\"}", Part.class);
        Part q = gson.fromJson("{\"partCode\":\"A001\",\"description\":\"Part 1 A\",\"org\":{\"orgCode\":\"XYZ\",\"description\":\"Some Corporation\"}}\n", Part.class);

        System.out.println(q.partCode + " : " + q.getDescription() + " : " + q.org.description);
    }
}

Organization.java

package com.katkam.entity;

/**
 * Created by Developer on 6/12/17.
 */
public class Organization {
    public Organization() {}
    public Organization(String code, String desc) { orgCode = code; description = desc; }
    public String orgCode;
    public String description;
}

Part.java

package com.katkam.entity;

/**
 * Created by Developer on 6/12/17.
 */
public class Part {
    public String partCode;

    private String description;
    public String getDescription() { return description; }
    public void setDescription(String a) { description = a; }

    public Organization org;
}

pom.xml

<?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.katkam</groupId>
    <artifactId>borgchat</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.0</version>
        </dependency>

        <dependency>
            <groupId>com.sparkjava</groupId>
            <artifactId>spark-core</artifactId>
            <version>2.6.0</version>
        </dependency>

        <!--
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>mssql-jdbc</artifactId>
            <version>6.1.0.jre8</version>
        </dependency>
        -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

WebServer.java

import com.google.gson.Gson;
import com.katkam.entity.Part;

import static spark.Spark.port;
import static spark.Spark.get;

/**
 * Created by Developer on 6/12/17.
 */
public class WebServer {
    public static void main(String args[]) {
        port(1947);
        Gson gson = new Gson();

        //Sample URL: http://localhost:1947/
        get("/", (request, response) -> "Hello");

        //Sample URL: http://localhost:1947/now
        get("/now", (request, response) -> {
            response.header("Content-Type", "application/json");
            return gson.toJson(new java.util.Date());
        });

        //Sample URL: http://localhost:1947/part?code=50501
        get ("/part", (request, response) -> {
            Part p = new Part();
            p.partCode = "P-"+request.queryParams("code");
            p.setDescription("Description comes here");
            return gson.toJson(p);
        });
    }
}

Use the path "/part/:partno" with request.params(":partno")