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janbodnarjanbodnar
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‎json/gson/GsonDataBindApiRead.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import com.google.gson.reflect.TypeToken;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.Reader;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.Arrays;
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import java.util.List;
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class Car {
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private final String name;
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private final String model;
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private final int price;
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private final String[] colours;
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public Car(String name, String model, int price, String[] colours) {
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this.name = name;
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this.model = model;
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this.price = price;
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this.colours = colours;
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}
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@Override
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public String toString() {
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return "Car{" + "name=" + name + ", model=" + model +
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", price=" + price + ", colours=" + Arrays.toString(colours) + '}';
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}
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}
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public class GsonDataBindApiRead {
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public static void main(String[] args) throws FileNotFoundException, IOException {
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String fileName = "src/main/resources/cars.json";
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Path path = Paths.get(fileName);
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try (Reader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
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Gson gson = new Gson();
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List<Car> cars = gson.fromJson(reader,
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new TypeToken<List<Car>>(){}.getType());
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cars.forEach(System.out::println);
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}
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}
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}

‎json/gson/GsonDataBindApiWrite.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.Writer;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.List;
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class Car {
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private final String name;
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private final String model;
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private final int price;
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private final String[] colours;
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public Car(String name, String model, int price, String[] colours) {
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this.name = name;
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this.model = model;
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this.price = price;
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this.colours = colours;
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}
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}
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public class GsonDataBindApiWrite {
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public static void main(String[] args) throws FileNotFoundException, IOException {
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List<Car> cars = new ArrayList<>();
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cars.add(new Car("Audi", "2012", 22000, new String[]{"gray", "red", "white"}));
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cars.add(new Car("Skoda", "2016", 14000, new String[]{"black", "gray", "white"}));
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cars.add(new Car("Volvo", "2010", 19500, new String[]{"black", "silver", "beige"}));
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String fileName = "src/main/resources/cars.json";
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Path path = Paths.get(fileName);
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try (Writer writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {
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Gson gson = new Gson();
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gson.toJson(cars, writer);
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}
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System.out.println("Cars written to file");
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}
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}

‎json/gson/GsonExcludeFileds.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import com.google.gson.annotations.Expose;
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enum MaritalStatus {
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SINGLE,
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MARRIED,
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DIVORCED,
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UNKNOWN
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}
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class Person {
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@Expose
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private String firstName;
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@Expose
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private String lastName;
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private MaritalStatus maritalStatus;
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public Person(String firstName, String lastName,
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MaritalStatus maritalStatus) {
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this.firstName = firstName;
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this.lastName = lastName;
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this.maritalStatus = maritalStatus;
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}
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public Person() {}
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}
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public class GsonExcludeFileds {
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public static void main(String[] args) {
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Gson gson = new GsonBuilder()
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.excludeFieldsWithoutExposeAnnotation()
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.setPrettyPrinting()
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.create();
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Person p = new Person("Jack", "Sparrow", MaritalStatus.UNKNOWN);
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gson.toJson(p, System.out);
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}
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}

‎json/gson/GsonFromJson.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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class User {
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private final String firstName;
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private final String lastName;
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public User(String firstName, String lastName) {
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this.firstName = firstName;
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this.lastName = lastName;
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}
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@Override
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public String toString() {
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return new StringBuilder().append("User{").append("First name: ")
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.append(firstName).append(", Last name: ")
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.append(lastName).append("}").toString();
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}
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}
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public class GsonFromJson {
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public static void main(String[] args) {
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String json_string = "{\"firstName\":\"Tom\", \"lastName\": \"Broody\"}";
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Gson gson = new Gson();
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User user = gson.fromJson(json_string, User.class);
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System.out.println(user);
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}
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}

‎json/gson/GsonPrettyPrinting.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import java.util.HashMap;
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import java.util.Map;
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public class GsonPrettyPrinting {
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public static void main(String[] args) {
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Gson gson = new GsonBuilder()
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.setPrettyPrinting()
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.create();
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Map<String, Integer> items = new HashMap<>();
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items.put("chair", 3);
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items.put("pencil", 1);
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items.put("book", 5);
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gson.toJson(items, System.out);
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}
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}

‎json/gson/GsonReadArray.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import java.io.File;
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import java.io.IOException;
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import java.io.Reader;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.Arrays;
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class User {
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private final String firstName;
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private final String lastName;
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public User(String firstName, String lastName) {
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this.firstName = firstName;
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this.lastName = lastName;
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}
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@Override
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public String toString() {
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return new StringBuilder().append("{User").append("First name: ")
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.append(firstName).append(", Last name: ")
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.append(lastName).append("}").toString();
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}
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}
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public class GsonReadArray {
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public static void main(String[] args) throws IOException {
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Gson gson = new GsonBuilder().create();
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String fileName = "src/main/resources/users.json";
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Path path = new File(fileName).toPath();
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try (Reader reader = Files.newBufferedReader(path,
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StandardCharsets.UTF_8)) {
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User[] users = gson.fromJson(reader, User[].class);
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Arrays.stream(users).forEach( e -> {
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System.out.println(e);
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});
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}
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}
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}

‎json/gson/GsonReadList.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import com.google.gson.reflect.TypeToken;
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import java.io.FileReader;
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import java.io.IOException;
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import java.io.Reader;
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import java.util.List;
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class Item {
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private String name;
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private int quantity;
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@Override
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public String toString() {
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return "Item{" + "name=" + name + ", quantity=" + quantity + '}';
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}
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}
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public class GsonReadList {
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public static void main(String[] args) throws IOException {
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Gson gson = new GsonBuilder().create();
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try (Reader reader = new FileReader("src/main/resources/items.json")) {
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List<Item> items = gson.fromJson(reader,
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new TypeToken<List<Item>>(){}.getType());
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items.forEach(System.out::println);
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}
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}
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}

‎json/gson/GsonReadWebPage.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import java.io.IOException;
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import org.jsoup.Jsoup;
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class TimeData {
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private String time;
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private Long milliseconds_since_epoch;
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private String date;
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@Override
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public String toString() {
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return "TimeData{" + "time=" + time + ", milliseconds_since_epoch="
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+ milliseconds_since_epoch + ", date=" + date + '}';
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}
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}
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public class GsonReadWebPage {
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public static void main(String[] args) throws IOException {
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String webPage = "http://time.jsontest.com.";
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String data = Jsoup.connect(webPage).ignoreContentType(true).execute().body();
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Gson gson = new Gson();
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TimeData td = gson.fromJson(data, TimeData.class);
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System.out.println(td);
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}
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}

‎json/gson/GsonSerializeNulls.java‎

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package com.zetcode;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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class User {
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private String firstName;
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private String lastName;
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public User() {};
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public User(String firstName, String lastName) {
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this.firstName = firstName;
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this.lastName = lastName;
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}
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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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@Override
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public String toString() {
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return new StringBuilder().append("User{").append("First name: ")
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.append(firstName).append(", Last name: ")
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.append(lastName).append("}").toString();
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}
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}
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public class GsonSerializeNulls {
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public static void main(String[] args) {
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GsonBuilder builder = new GsonBuilder();
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builder.serializeNulls();
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Gson gson = builder.create();
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User user = new User();
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user.setFirstName("Norman");
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String json = gson.toJson(user);
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System.out.println(json);
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}
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}

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