Generating JSON Response

In this example we are going to show generating JSON response

Steps:

1.      WEB.xml :

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"                 xmlns="http://java.sun.com/xml/ns/javaee"                 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"                 id="WebApp_ID" version="2.5">                 <display-name>com.tushar.jersey.Project</display-name>                 <welcome-file-list>                                 <welcome-file>index.html</welcome-file>                                 <welcome-file>index.htm</welcome-file>                                 <welcome-file>index.jsp</welcome-file>                                 <welcome-file>default.html</welcome-file>                                 <welcome-file>default.htm</welcome-file>                                 <welcome-file>default.jsp</welcome-file>                 </welcome-file-list>                 <servlet>                                 <servlet-name>jersey-serlvet</servlet-name>                                 <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>                                 <init-param>                                                 <param-name>com.sun.jersey.config.property.packages</param-name>                                                 <param-value>com.tushar.jersey.Project</param-value>                                 </init-param>                                 <init-param>                                 <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>                                                 <param-value>true</param-value>                                 </init-param>                                 <load-on-startup>1</load-on-startup>                 </servlet>                 <servlet-mapping>                                 <servlet-name>jersey-serlvet</servlet-name>                                 <url-pattern>/rest/*</url-pattern>                 </servlet-mapping> </web-app>

2.      Create Service class

package com.tushar.jersey.Project; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.core.Response; import org.codehaus.jettison.json.JSONException; import org.codehaus.jettison.json.JSONObject; @Path("/jsonResponse") public class JSONResponse {        @GET          @Produces("application/json")          public Response convertFtoC() throws JSONException {               JSONObject jsonObject = new JSONObject();               Double fahrenheit = 98.24;               Double celsius;               celsius = (fahrenheit - 32)*5/9;               jsonObject.put("F Value", fahrenheit);               jsonObject.put("C Value", celsius);               String result = "@Produces(\"application/json\") Output: \n\nF to C Converter Output: \n\n" + jsonObject;               return Response.status(200).entity(result).build();          }          @Path("{f}")          @GET          @Produces("application/json")          public Response convertFtoCfromInput(@PathParam("f") float f) throws JSONException {               JSONObject jsonObject = new JSONObject();               float celsius;               celsius =  (f - 32)*5/9;               jsonObject.put("F Value", f);               jsonObject.put("C Value", celsius);               String result = "@Produces(\"application/json\") Output: \n\nF to C Converter Output: \n\n" + jsonObject;               return Response.status(200).entity(result).build();          }        }

2.      Execute the Code

       http://localhost:8080/com.tushar.jersey.Project/rest/jsonResponse

Output:

http://localhost:8080/com.tushar.jersey.Project/rest/jsonResponse/10

Output: