- Create a REST Service to add a new question to survey
- @PostMapping("/surveys/{surveyId}/questions")
- @RequestBody Question question
- What should be Response Status for create?
- ResponseEntity.created(location).build()
- ResponseEntity.noContent().build()
- Using Postman : https://www.getpostman.com
- URL to POST to - http://localhost:8080/surveys/Survey1/questions
Sample Body for POST Request
{"description":"Second Most Populous Country in the World","correctAnswer":"India","options":["India","Russia","United States","China"]}
First Snippet
@PostMapping("/surveys/{surveyId}/questions")
ResponseEntity<?> add(@PathVariable String surveyId,
@RequestBody Question question) {
Question createdTodo = surveyService.addQuestion(surveyId, question);
if (createdTodo == null) {
return ResponseEntity.noContent().build();
}
URI location = ServletUriComponentsBuilder.fromCurrentRequest()
.path("/{id}").buildAndExpand(createdTodo.getId()).toUri();
return ResponseEntity.created(location).build();
}
- Create more REST services of your choice
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.in28minutes.springboot</groupId>
<artifactId>first-springboot-project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
package com.in28minutes.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
ApplicationContext ctx = SpringApplication.run(Application.class, args);
}
}
package com.in28minutes.springboot.controller;
import java.net.URI;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
import com.in28minutes.springboot.model.Question;
import com.in28minutes.springboot.service.SurveyService;
@RestController
class SurveyController {
@Autowired
private SurveyService surveyService;
@GetMapping("/surveys/{surveyId}/questions")
public List<Question> retrieveQuestions(@PathVariable String surveyId) {
return surveyService.retrieveQuestions(surveyId);
}
// GET "/surveys/{surveyId}/questions/{questionId}"
@GetMapping("/surveys/{surveyId}/questions/{questionId}")
public Question retrieveDetailsForQuestion(@PathVariable String surveyId,
@PathVariable String questionId) {
return surveyService.retrieveQuestion(surveyId, questionId);
}
// /surveys/{surveyId}/questions
@PostMapping("/surveys/{surveyId}/questions")
public ResponseEntity<Void> addQuestionToSurvey(
@PathVariable String surveyId, @RequestBody Question newQuestion) {
Question question = surveyService.addQuestion(surveyId, newQuestion);
if (question == null)
return ResponseEntity.noContent().build();
// Success - URI of the new resource in Response Header
// Status - created
// URI -> /surveys/{surveyId}/questions/{questionId}
// question.getQuestionId()
URI location = ServletUriComponentsBuilder.fromCurrentRequest().path(
"/{id}").buildAndExpand(question.getId()).toUri();
// Status
return ResponseEntity.created(location).build();
}
}
package com.in28minutes.springboot.model;
import java.util.List;
public class Question {
private String id;
private String description;
private String correctAnswer;
private List<String> options;
// Needed by Caused by: com.fasterxml.jackson.databind.JsonMappingException:
// Can not construct instance of com.in28minutes.springboot.model.Question:
// no suitable constructor found, can not deserialize from Object value
// (missing default constructor or creator, or perhaps need to add/enable
// type information?)
public Question() {
}
public Question(String id, String description, String correctAnswer,
List<String> options) {
super();
this.id = id;
this.description = description;
this.correctAnswer = correctAnswer;
this.options = options;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getDescription() {
return description;
}
public String getCorrectAnswer() {
return correctAnswer;
}
public List<String> getOptions() {
return options;
}
@Override
public String toString() {
return String
.format("Question [id=%s, description=%s, correctAnswer=%s, options=%s]",
id, description, correctAnswer, options);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Question other = (Question) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
}
package com.in28minutes.springboot.model;
import java.util.List;
public class Survey {
private String id;
private String title;
private String description;
private List<Question> questions;
public Survey(String id, String title, String description,
List<Question> questions) {
super();
this.id = id;
this.title = title;
this.description = description;
this.questions = questions;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public List<Question> getQuestions() {
return questions;
}
public void setQuestions(List<Question> questions) {
this.questions = questions;
}
@Override
public String toString() {
return "Survey [id=" + id + ", title=" + title + ", description="
+ description + ", questions=" + questions + "]";
}
}
package com.in28minutes.springboot.service;
import java.math.BigInteger;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.springframework.stereotype.Component;
import com.in28minutes.springboot.model.Question;
import com.in28minutes.springboot.model.Survey;
@Component
public class SurveyService {
private static List<Survey> surveys = new ArrayList<>();
static {
Question question1 = new Question("Question1",
"Largest Country in the World", "Russia", Arrays.asList(
"India", "Russia", "United States", "China"));
Question question2 = new Question("Question2",
"Most Populus Country in the World", "China", Arrays.asList(
"India", "Russia", "United States", "China"));
Question question3 = new Question("Question3",
"Highest GDP in the World", "United States", Arrays.asList(
"India", "Russia", "United States", "China"));
Question question4 = new Question("Question4",
"Second largest english speaking country", "India", Arrays
.asList("India", "Russia", "United States", "China"));
List<Question> questions = new ArrayList<>(Arrays.asList(question1,
question2, question3, question4));
Survey survey = new Survey("Survey1", "My Favorite Survey",
"Description of the Survey", questions);
surveys.add(survey);
}
public List<Survey> retrieveAllSurveys() {
return surveys;
}
public Survey retrieveSurvey(String surveyId) {
for (Survey survey : surveys) {
if (survey.getId().equals(surveyId)) {
return survey;
}
}
return null;
}
public List<Question> retrieveQuestions(String surveyId) {
Survey survey = retrieveSurvey(surveyId);
if (survey == null) {
return null;
}
return survey.getQuestions();
}
public Question retrieveQuestion(String surveyId, String questionId) {
Survey survey = retrieveSurvey(surveyId);
if (survey == null) {
return null;
}
for (Question question : survey.getQuestions()) {
if (question.getId().equals(questionId)) {
return question;
}
}
return null;
}
private SecureRandom random = new SecureRandom();
public Question addQuestion(String surveyId, Question question) {
Survey survey = retrieveSurvey(surveyId);
if (survey == null) {
return null;
}
String randomId = new BigInteger(130, random).toString(32);
question.setId(randomId);
survey.getQuestions().add(question);
return question;
}
}
package com.in28minutes.springboot;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class WelcomeController {
//Auto wiring
@Autowired
private WelcomeService service;
@RequestMapping("/welcome")
public String welcome() {
return service.retrieveWelcomeMessage();
}
}
package com.in28minutes.springboot;
import org.springframework.stereotype.Component;
@Component
public class WelcomeService {
public String retrieveWelcomeMessage() {
//Complex Method
return "Good Morning updated";
}
}
logging.level.org.springframework: DEBUG