QueryParam Example

@QueryParam allows the rest service consumer to pass the input in service URI as a query string Parameters should be sent as query string in URL. Query string should start with? (Question Mark), parameter and value should be separated by = (equals), each parameter value pair should be separated by & (Ampersand). In this tutorial you will learn to pass the input to rest service and extract the input parameters using @QueryParam. Follow the below steps to create the example.

Step 1: Create a dynamic web project.

Step 2: Add Jersey implementation Jars by downloading from the following location.

(Google search key word “jax rs jersey jar download”)

https://jersey.github.io/download.html

Or click here to download the jars that we have used.

Now we will get jaxrs-ri-2.28.zip, extract the zip file. Copy all the jars present in lib, ext and api directories into “WebContent/WEB-INF/ lib” directory of project.

Step 3: Now create a Restful services using QueryParam annotations.

RestServiceQueryParam.java

package com.java4coding;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.Produces;

import javax.ws.rs.QueryParam;

import javax.ws.rs.core.MediaType;

@Path("/hello")

public class RestServiceQueryParam {

@GET

@Produces(MediaType.TEXT_PLAIN)

public String sayHello(@QueryParam("firstName") String firstName, @QueryParam("lastName") String lastName) {

return "Hello " + firstName+ " "+ lastName;

}

Step 5: In web.xml, configure service as below.

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns="https://java.sun.com/xml/ns/j2ee" xmlns:web="https://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="https://java.sun.com/xml/ns/j2ee https://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" id="WebApp_ID" version="2.4">