[REST Jersey] @QueryParam Demo

This demo sourced from the jersey tutor. https://jersey.java.net/documentation/latest/jaxrs-resources.html#d0e1433 provides the necessary info for you.

HelloWorldResource.java

 

package com.example;



import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.Produces;

import javax.ws.rs.QueryParam;

import javax.ws.rs.DefaultValue;

/**

 *

 * @author 

 */

@Path("helloworld")

public class HelloWorldResource {

    public static final String CLICHED_MESSAGE = "Hello World!";

    /*

    @GET

    @Produces("text/plain")

    public String getHello() {

        return CLICHED_MESSAGE;

    }

*/

    @GET

    @Path("/get")

    @Produces("text/plain")

    //@Produces("application/json")

    public String getQueryObj(

        @QueryParam ("featureID") @DefaultValue("0") String fid,

        @QueryParam ("userID") @DefaultValue( "0" ) int uid,

        @QueryParam ("color") @DefaultValue("red") ColorParam clr

        // color default value: green, blue

        ) {

        return new String("QueryParam: {"+ fid + ": " + uid + " : " + clr + "}." + CLICHED_MESSAGE);

    }



}

ColorParam.java

 

 

package com.example;

import java.awt.Color;

import javax.ws.rs.WebApplicationException;

import java.lang.reflect.Field;



public class ColorParam extends Color {



    public ColorParam(String s) {

        super(getRGB(s));

    }



    private static int getRGB(String s) {

        if (s.charAt(0) == '#') {

            try {

                Color c = Color.decode("0x" + s.substring(1));

                return c.getRGB();

            } catch (NumberFormatException e) {

                throw new WebApplicationException(400);

            }

        } else {

            try {

                Field f = Color.class.getField(s);

                return ((Color)f.get(null)).getRGB();

            } catch (Exception e) {

                throw new WebApplicationException(400);

            }

        }

    }

}

 

Call it after the above java files are packaged as a war deployed in tomcat container.

 

http://hostname:8080/simple-service-webapp/webapi/helloworld/get?featureID=12

QueryParam: {12: 0 : com.example.ColorParam[r=255,g=0,b=0]}.Hello World!



http://hostname:8080/simple-service-webapp/webapi/helloworld/get?featureID=12&userID=123

QueryParam: {12: 123 : com.example.ColorParam[r=255,g=0,b=0]}.Hello World!



http://hostname:8080/simple-service-webapp/webapi/helloworld/get?featureID=12&userID=123&color=yellow

QueryParam: {12: 123 : com.example.ColorParam[r=255,g=255,b=0]}.Hello World!