In this tutorial, we will learn how to return JSON in a Micronaut controller using simple and practical examples. Table of contents 1. Setting Up the Micronaut Project 2. Returning a JSON Object Define a Data Model What is @Serdeable? Create a Controller Run the Application 3. Returning a List of JSON Objects Run the […]
This article shows how to use MockMvc and JsonPath to test JSON in Spring Boot. Table of Contents: 1. Spring Boot Test Dependencies 2. Testing JSON Simple Structure 3. Testing a List 4. Testing a Map 5. Testing JSON in Spring Boot 5.1 Spring Boot REST Controller returns JSON 5.1 Testing JSON Data 6. Download […]
In the Spring framework, the @ResponseBody annotation tells the Spring framework to write the method’s return type to the HTTP response body (not placed in a Model or interpreted as a view name). Spring 3.0 introduced the @ResponseBody annotation on the method level. Spring 4.0 enhanced the @ResponseBody annotation to put on the class level, […]
In JAX-RS, we can use response.readEntity(String.class) to read the response body from a post request. import jakarta.ws.rs.core.Response; Response response = //… // read response body String body = response.readEntity(String.class); P.S Tested with Jersey 3.x 1. Problem Below is a JAX-RS POST request endpoint to accept a JSON input and return a JSON response. // POST, […]
This article shows how to return a JSON response in the Jersey application, using EclipseLink MOXy. Tested with Jersey 3.0.2 EclipseLink MOXy 3 Jetty 11, HTTP Server Java 11 Maven 3 SLF4J, Logback, redirect Jersey J.U.L logs to logback JUnit 5 and JSONassert 1.5 (Unit Test) org.json 20210307, JSONObject Table of contents 1. EclipseLink MOXy […]
This article shows how to start a Jetty HTTP Sever to run a JAX-RS or Eclipse Jersey application. Tested with Jersey 3.0.2 Jetty 11 Jackson 2.12.2 JUnit 5.4.0 (unit test) JSONassert 1.5.0 (unit test) Maven 3.8.3 Java 11 Tables of contents 1. Using Jersey with Jetty HTTP Server 2. Project Directory 3. Project dependencies 4. […]
This article shows you how to use the new Java 11 HttpClient APIs to send HTTP GET/POST requests, and some frequent used examples. HttpClient httpClient = HttpClient.newBuilder() .version(HttpClient.Version.HTTP_2) .followRedirects(HttpClient.Redirect.NORMAL) .connectTimeout(Duration.ofSeconds(20)) .proxy(ProxySelector.of(new InetSocketAddress("proxy.yourcompany.com", 80))) .authenticator(Authenticator.getDefault()) .build(); 1. Synchronous Example This example sends a GET request to https://httpbin.org/get, and print out the response header, status code, and […]
This article shows you how to use the OkHttp library to send an HTTP GET/POST requests and some frequent used examples. P.S Tested with OkHttp 4.2.2 pom.xml <dependency> <groupId>com.squareup.okhttp3</groupId> <artifactId>okhttp</artifactId> <version>4.2.2</version> </dependency> 1. Synchronous Get Request OkHttpExample1.java package com.mkyong.http; import okhttp3.Headers; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; import java.io.IOException; public class OkHttpExample1 { // only […]
FastJson provides easily APIs to convert Java objects to / from JSON JSON.toJSONString – Java objects to JSON JSON.parseObject – JSON to Java objects JSON.parseArray – JSON array to List of Java objects Note You may have interest to read this How to parse JSON with Jackson Overall, the FastJson is really simple and easy […]
In this tutorial, we will show you how to parse JSON with JSON.simple Note You may have interest to read – How to parse JSON with Jackson or Gson JSON.simple short history This project was formerly JSON.simple 1.x from a Google code project by Yidong, now maintaining by Clifton Labs, read this JSON.simple history P.S […]
This article uses the Jackson framework to parse JSON strings in Java. Table of contents: 1. Download Jackson 2. Parse JSON String with Jackson 3. Parse JSON Array with Jackson 4. Convert Java Object to JSON String 5. Convert JSON String to Java Object 6. Download Source Code 7. References P.S Tested with Jackson 2.17.0 […]
In Spring, we can use Hamcrest APIs like hasItem and hasSize to test a JSON Array. Review the following example : package com.mkyong; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.boot.test.mock.mockito.MockBean; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.test.context.ActiveProfiles; import org.springframework.test.context.junit4.SpringRunner; import org.springframework.test.web.servlet.MockMvc; import static org.hamcrest.Matchers.*; import static org.mockito.ArgumentMatchers.any; import static org.mockito.Mockito.times; import […]
In this article, we will show you error handling in Spring Boot REST application. Technologies used : Spring Boot 2.1.2.RELEASE Spring 5.1.4.RELEASE Maven 3 Java 8 1. /error 1.1 By default, Spring Boot provides a BasicErrorController controller for /error mapping that handles all errors, and getErrorAttributes to produce a JSON response with details of the […]
In Java, we can use JSONAssert to unit test JSON data easily. 1. Maven pom.xml <dependency> <groupId>org.skyscreamer</groupId> <artifactId>jsonassert</artifactId> <version>1.5.0</version> </dependency> 2. JSON Object To test the JSON Object, Strict or not, fields order does not matter. If the extended fields are matter, enable the strict mode. 2.1 When the strictMode is off. JSONObject actual = […]
On Windows, the key to send JSON data is double-quotes like this -d "{\"name\":\"Spring Forever\"}" cURL to POST a JSON data curl -X POST localhost:8080/books -H "Content-type:application/json" -d "{\"name\":\"Spring Forever\",\"author\":\"pivotal\"}" References cURL – Post JSON data to Spring REST
Example to use cURL -X PUT to send a PUT (update) request to update the user’s name and email. Terminal $ curl -X PUT -d ‘name=mkyong&[email protected]’ http://localhost:8080/user/100 If the REST API only accepts json formatted data, try this Terminal $ curl -X PUT -H "Content-Type: application/json" -d ‘{"name":"mkyong","email":"[email protected]"}’ http://localhost:8080/user/100 References cURL official website cURL – […]
In JavaScript, you can use JSON.stringify to convert an array or values into a JSON formatted string. var output = {} output[0] = "a"; output[1] = "b"; output[2] = "c"; console.log( JSON.stringify(output) ); Output { "0":"a", "1":"b", "2":"c" } 1. jQuery Ajax Request Often times, you need to convert the JavaScript values into JSON before […]
This article will show you how to use jQuery.ajax to send a HTML form request to a Spring REST API and return a JSON response. Tools used : Spring Boot 1.5.1.RELEASE Spring 4.3.6.RELEASE Maven 3 jQuery Bootstrap 3 Note You may interest at this classic Spring MVC Ajax example 1. Project Structure A standard Maven […]
Some cURL POST request examples for self reference. 1. Normal POST 1.1 To POST without data. $ curl -X POST http://localhost:8080/api/login/ 1.2 To POST with data. $ curl -d "username=mkyong&password=abc" http://localhost:8080/api/login/ 1.3 Spring REST to accept normal POST data. @PostMapping("/api/login") public ResponseEntity<?> login(@RequestParam("username") String username, @RequestParam("password") String password) { //… } @PostMapping("/api/login") public ResponseEntity<?> login(@ModelAttribute […]
This article shows you how to use cURL command to POST JSON data to a Spring REST API. 1. Spring REST A Simple Spring REST API to validate a login. LoginController.java package com.mkyong.controller; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; @Controller public class LoginController { private final Logger […]
Review a jQuery Ajax form submit. $(document).ready(function () { $("#hostingForm").submit(function (e) { e.preventDefault(e); var data = {} data["id"] = $("#id").val(); data["domain"] = $("#domain").val(); data["name"] = $("#name").val(); //… $.ajax({ type: "POST", contentType: "application/json", url: "{{home}}/hosting/update", data: JSON.stringify(data), dataType: ‘json’, timeout: 600000, success: function (data) { console.log("SUCCESS: ", data); }, error: function (e) { console.log("ERROR: ", e); […]
In this tutorial, we will show you how to use Jackson 2.x to convert Java objects to / from a JSON. 1. Basic 1.1 Convert a Staff object to from JSON. writeValue(…) – Java Objects to JSON ObjectMapper mapper = new ObjectMapper(); // Java object to JSON file mapper.writeValue(new File("c:\\test\\staff.json"), new Staff()); // Java object […]
Review a simple jQuery example to loop over a JavaScript array object. var json = [ {"id":"1","tagName":"apple"}, {"id":"2","tagName":"orange"}, {"id":"3","tagName":"banana"}, {"id":"4","tagName":"watermelon"}, {"id":"5","tagName":"pineapple"} ]; $.each(json, function(idx, obj) { alert(obj.tagName); }); Above code snippet is working fine, prompts the “apple”, “orange” … as expected. Problem : JSON string Review below example, declares a JSON string (enclosed with single […]
Below is a JSON string. JSON String { "name": "mkyong", "age": 30, "address": { "streetAddress": "88 8nd Street", "city": "New York" }, "phoneNumber": [ { "type": "home", "number": "111 111-1111" }, { "type": "fax", "number": "222 222-2222" } ] } To access the JSON object in JavaScript, parse it with JSON.parse(), and access it via […]
A simple example to use Jackson to convert a JSON string to a Map. String json = "{name:\"mkyong\"}"; Map<String,String> map = new HashMap<String,String>(); ObjectMapper mapper = new ObjectMapper(); map = mapper.readValue(json, new TypeReference<HashMap<String,String>>(){}); Problem When the program is executed, it hits following error message org.codehaus.jackson.JsonParseException: Unexpected character (‘n’ (code 110)): was expecting double-quote to start […]
In this tutorial, we show you how to use Jackson 1.x data binding to convert Java object to / from JSON. Note Jackson 1.x is a maintenance project, please use Jackson 2.x instead. Note This tutorial is obsolete, no more update, please refer to the latest Jackson 2 tutorial – Object to / from JSON. […]
In this tutorial, we show you how to output JSON data in Spring MVC framework. Technologies used : Spring 3.2.2.RELEASE Jackson 1.9.10 JDK 1.6 Eclipse 3.6 Maven 3 P.S In Spring 3, to output JSON data, just puts Jackson library in the project classpath. 1. Project Dependencies Get Jackson and Spring dependencies. pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" […]
This article shows how to return a JSON response in the Jersey application, using Jackson 2.x. Tested with Jersey 3.0.2 Grizzly 3 HTTP Server Jackson 2.12.2 Java 11 Maven JUnit 5 and JSONassert 1.5 (Unit Test) Table of contents 1. Jackson as the JSON provider in Jersey 2. Project Directory 3. Project dependencies 4. Jersey […]
Jettison as JSON provider You may also interest to read this RESTEasy + Jettison + JAXB example. Many like Jackson JSON processor, and it supported in RESTEasy. In this tutorial, we show you how to convert an object to JSON format and return it back to the client. 1. RESTEasy + Jackson To integrate Jackson […]
RESTEasy uses Jettison JSON library to map JAXB annotation object to and from JSON. In this tutorial, we show you how to convert an JAXB annotated object into JSON format and return it back to client. Jackson as JSON provider You may also interest to read this RESTEasy + Jackson example. 1. RESTEasy + JAXB […]
MongoDB comes with “com.mongodb.util.JSON” class to convert JSON data directly to a DBObject. For example, data represent in JSON format : { ‘name’ : ‘mkyong’, ‘age’ : 30 } To convert it to DBObject, you can code like this : DBObject dbObject = (DBObject) JSON.parse("{‘name’:’mkyong’, ‘age’:30}"); Example See a full example to convert above JSON […]
Delicious, the best bookmark website, provides many APIs to let developers to deal with the bookmarks’ data. Here’s an example to use jQuery to retrieve the total number bookmark count of a given URL. Delicious API To get a total number of bookmark, use this http://feeds.delicious.com/v2/json/urlinfo/data?url=xxx.com&callback=? jQuery Ajax jQuery, comes with an easy but powerful […]
