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BAEL-390: json processing with java ee 7
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‎jee7/src/main/java/com/baeldung/json/Person.java‎

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package com.baeldung.json;
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import java.util.Date;
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import java.util.List;
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public class Person {
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private String firstName;
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private String lastName;
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private Date birthdate;
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private List<String> emails;
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public String getFirstName() {
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return firstName;
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}
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public void setFirstName(String firstName) {
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this.firstName = firstName;
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}
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public String getLastName() {
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return lastName;
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}
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public void setLastName(String lastName) {
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this.lastName = lastName;
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}
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public Date getBirthdate() {
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return birthdate;
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}
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public void setBirthdate(Date birthdate) {
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this.birthdate = birthdate;
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}
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public List<String> getEmails() {
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return emails;
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}
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public void setEmails(List<String> emails) {
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this.emails = emails;
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}
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}

‎jee7/src/main/java/com/baeldung/json/PersonBuilder.java‎

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package com.baeldung.json;
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import java.io.IOException;
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import java.io.StringReader;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.List;
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import javax.json.Json;
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import javax.json.JsonArray;
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import javax.json.JsonObject;
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import javax.json.JsonReader;
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import javax.json.JsonString;
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public class PersonBuilder {
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private String jsonString;
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private SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
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public PersonBuilder(String jsonString) {
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this.jsonString = jsonString;
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}
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public Person build() throws IOException, ParseException {
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JsonReader reader = Json.createReader(new StringReader(jsonString));
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JsonObject jsonObject = reader.readObject();
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Person person = new Person();
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person.setFirstName(jsonObject.getString("firstName"));
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person.setLastName(jsonObject.getString("lastName"));
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person.setBirthdate(dateFormat.parse(jsonObject.getString("birthdate")));
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JsonArray emailsJson = jsonObject.getJsonArray("emails");
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List<String> emails = new ArrayList<>();
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for (JsonString j : emailsJson.getValuesAs(JsonString.class)) {
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emails.add(j.getString());
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}
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person.setEmails(emails);
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return person;
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}
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}

‎jee7/src/main/java/com/baeldung/json/PersonWriter.java‎

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package com.baeldung.json;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.io.Writer;
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import java.text.SimpleDateFormat;
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import java.util.HashMap;
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import java.util.Map;
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import javax.json.Json;
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import javax.json.JsonArrayBuilder;
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import javax.json.JsonObject;
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import javax.json.JsonObjectBuilder;
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import javax.json.JsonWriterFactory;
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import javax.json.stream.JsonGenerator;
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public class PersonWriter {
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private Person person;
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private SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
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public PersonWriter(Person person) {
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this.person = person;
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}
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public String write() throws IOException {
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JsonObjectBuilder objectBuilder = Json.createObjectBuilder()
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.add("firstName", person.getFirstName())
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.add("lastName", person.getLastName())
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.add("birthdate", dateFormat.format(person.getBirthdate()));
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JsonArrayBuilder arrayBuilder = Json.createArrayBuilder();
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for(String email : person.getEmails()) {
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arrayBuilder.add(email);
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}
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objectBuilder.add("emails", arrayBuilder);
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JsonObject jsonObject = objectBuilder.build();
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JsonWriterFactory writerFactory = createWriterFactory();
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String jsonString = writeToString(jsonObject, writerFactory);
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return jsonString;
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}
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private String writeToString(JsonObject jsonObject, JsonWriterFactory writerFactory) throws IOException {
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String jsonString;
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try(Writer writer = new StringWriter()) {
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writerFactory.createWriter(writer).write(jsonObject);
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jsonString = writer.toString();
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}
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return jsonString;
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}
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private JsonWriterFactory createWriterFactory() {
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Map<String, Boolean> config = new HashMap<>();
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config.put(JsonGenerator.PRETTY_PRINTING, true);
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JsonWriterFactory writerFactory = Json.createWriterFactory(config);
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return writerFactory;
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}
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}

‎jee7/src/test/java/com/baeldug/json/JsonUnitTest.java‎

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package com.baeldug.json;
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import static org.hamcrest.CoreMatchers.hasItems;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertThat;
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import java.io.IOException;
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import java.io.StringReader;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Arrays;
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import javax.json.Json;
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import javax.json.JsonObject;
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import javax.json.JsonReader;
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import javax.json.stream.JsonParser;
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import javax.json.stream.JsonParser.Event;
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import org.junit.Before;
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import org.junit.Test;
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import com.baeldung.json.Person;
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import com.baeldung.json.PersonBuilder;
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import com.baeldung.json.PersonWriter;
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public class JsonUnitTest {
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private Person person;
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private SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
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private String personJson;
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private String petshopJson;
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@Test
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public void whenPersonIsConvertedToString_thenAValidJsonStringIsReturned() throws IOException {
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String generatedJsonString = new PersonWriter(person).write();
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assertEquals(
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"Generated String has the expected format and content",
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personJson,
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generatedJsonString);
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}
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@Test
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public void whenJsonStringIsConvertedToPerson_thenAValidObjectIsReturned(
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) throws IOException, ParseException {
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Person person = new PersonBuilder(personJson).build();
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assertEquals("First name has expected value", "Michael", person.getFirstName());
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assertEquals("Last name has expected value", "Scott", person.getLastName());
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assertEquals(
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"Birthdate has expected value",
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dateFormat.parse("06/15/1978"),
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person.getBirthdate());
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assertThat(
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"Email list has two items",
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person.getEmails(),
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hasItems("michael.scott@dd.com", "michael.scarn@gmail.com"));
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}
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@Test
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public void whenUsingObjectModelToQueryForSpecificProperty_thenExpectedValueIsReturned(
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) throws IOException, ParseException {
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JsonReader reader = Json.createReader(new StringReader(petshopJson));
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JsonObject jsonObject = reader.readObject();
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assertEquals(
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"The query should return the 'name' property of the third pet from the list",
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"Jake",
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jsonObject.getJsonArray("pets").getJsonObject(2).getString("name"));
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}
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@Test
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public void whenUsingStreamingApiToQueryForSpecificProperty_thenExpectedValueIsReturned(
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) throws IOException, ParseException {
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JsonParser jsonParser = Json.createParser(new StringReader(petshopJson));
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int count = 0;
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String result = null;
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while(jsonParser.hasNext()) {
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Event e = jsonParser.next();
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if (e == Event.KEY_NAME) {
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if(jsonParser.getString().equals("name")) {
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jsonParser.next();
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if(++count == 3) {
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result = jsonParser.getString();
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break;
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}
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}
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}
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}
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assertEquals(
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"The query should return the 'name' property of the third pet from the list",
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"Jake",
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result);
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}
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@Before
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public void init() throws ParseException {
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// Creates a Person object
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person = new Person();
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person.setFirstName("Michael");
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person.setLastName("Scott");
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person.setBirthdate(dateFormat.parse("06/15/1978"));
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person.setEmails(Arrays.asList("michael.scott@dd.com", "michael.scarn@gmail.com"));
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// Initializes the Person Json
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personJson = "\n" +
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"{\n" +
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" \"firstName\":\"Michael\",\n" +
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" \"lastName\":\"Scott\",\n" +
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" \"birthdate\":\"06/15/1978\",\n" +
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" \"emails\":[\n" +
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" \"michael.scott@dd.com\",\n" +
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" \"michael.scarn@gmail.com\"\n" +
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" ]\n" +
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"}";
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// Initializes the Pet Shop Json
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petshopJson = "\n" +
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"{\n" +
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" \"ownerId\":\"1\", \n" +
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" \"pets\":[ \n" +
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" {\"name\": \"Kitty\", \"type\": \"cat\"}, \n" +
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" {\"name\": \"Rex\", \"type\": \"dog\"}, \n" +
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" {\"name\": \"Jake\", \"type\": \"dog\"} \n" +
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" ]\n" +
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"}";
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}
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}

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