JAVA EXAMPLE PROGRAMS

How to read multiple values of a query paramter in JAX-RS restful web services?

In the previous example we have seen how to read query paramters from the request using @QueryParam annotation. What if the user request is in the below format? same id with multiple values?

http://localhost:8080/RestfulWebServices/employee/query?id=1016&id=1017&id=1415

In the above URL, the id value is same, but with different values, this can be easily readable as a list of values using UriInfo object.

In the previous examples we have given details of application setup, dependencies, web.xml file configurations: If you want to know about these configuration, please refer these:

Restful web services using RESTEasy hello world example.
Restful web services using Jersey hello world example.

Look at the below class which shows how to read multiple values with a unique request parameters:

package com.java2novice.restful;

import java.util.List;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;

@Path("/employee")
public class QueryParamExampleService {

	@GET
	@Path("/query")
	public Response getEmployeeQuery(@Context UriInfo uriInfo){
		
		/** read complete employee id list from request query parameter**/
		List<String> empIdList = uriInfo.getQueryParameters().get("id");
		System.out.println("Received List: "+empIdList);
		/** read first employee id from request query parameter **/
		String firstEmpId = uriInfo.getQueryParameters().getFirst("id");
		System.out.println("First emp record from the request: "+firstEmpId);
		
		return Response.status(200).entity("processed request").build();
	}
}

In the above example, if you use "/employee/query?id=1016&id=1017&id=1415" URI pattern with query parameters, here is the output:

Output:

INFO  [stdout] (http--127.0.0.1-8080-1) Received List: [1016, 1017, 1415]
INFO  [stdout] (http--127.0.0.1-8080-1) First emp record from the request: 1016

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I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.