GSON LocalDateTime、LocalDate序列化和反序列化示例

转x33g5p2x  于2022-10-16 转载在 其他  
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在本教程中，我们将为LocalDate和LocalDateTime类编写自定义序列化程序和反序列化程序。

  1. LocalDateSerializer
  2. LocalDateTimeSerializer
  3. LocalDateDeserializer
  4. LocalDateTimeDeserializer

Order POJO Class-要序列化和反序列化的对象

让我们首先定义一个要序列化和反序列化的对象-Order.java

  1. class Order {
  2.     private int id;
  3.     private String orderName;
  4.     private String orderDesc;
  5.     private LocalDate orderCreatedDate;
  6.     private LocalDateTime orderCreatedDateTime;
  8.     public int getId() {
  9.         return id;
  10.     }
  12.     public void setId(int id) {
  13.         this.id = id;
  14.     }
  16.     public String getOrderName() {
  17.         return orderName;
  18.     }
  20.     public void setOrderName(String orderName) {
  21.         this.orderName = orderName;
  22.     }
  24.     public String getOrderDesc() {
  25.         return orderDesc;
  26.     }
  28.     public void setOrderDesc(String orderDesc) {
  29.         this.orderDesc = orderDesc;
  30.     }
  32.     public LocalDate getOrderCreatedDate() {
  33.         return orderCreatedDate;
  34.     }
  36.     public void setOrderCreatedDate(LocalDate orderCreatedDate) {
  37.         this.orderCreatedDate = orderCreatedDate;
  38.     }
  40.     public LocalDateTime getOrderCreatedDateTime() {
  41.         return orderCreatedDateTime;
  42.     }
  44.     public void setOrderCreatedDateTime(LocalDateTime orderCreatedDateTime) {
  45.         this.orderCreatedDateTime = orderCreatedDateTime;
  46.     }
  48.     @Override
  49.     public String toString() {
  50.         return "Order [id=" + id + ", orderName=" + orderName + ", orderDesc=" + orderDesc + ", orderCreatedDate=" +
  51.             orderCreatedDate + ", orderCreatedDateTime=" + orderCreatedDateTime + "]";
  52.     }
  53. }

1.自定义GSON LocalDateSerializer

  1. class LocalDateSerializer implements JsonSerializer < LocalDate > {
  2.     private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d-MMM-yyyy");
  4.     @Override
  5.     public JsonElement serialize(LocalDate localDate, Type srcType, JsonSerializationContext context) {
  6.         return new JsonPrimitive(formatter.format(localDate));
  7.     }
  8. }

请注意，我们将默认本地日期“2018-10-26”格式化为“2018年10月27日”。

2.自定义GSON LocalDateTimeSerializer

  1. class LocalDateTimeSerializer implements JsonSerializer < LocalDateTime > {
  2.     private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d::MMM::uuuu HH::mm::ss");
  4.     @Override
  5.     public JsonElement serialize(LocalDateTime localDateTime, Type srcType, JsonSerializationContext context) {
  6.         return new JsonPrimitive(formatter.format(localDateTime));
  7.     }
  8. }

请注意，我们将默认本地日期“2018-10-26T11:09:05”格式化为“27:：Oct:：2018 14:：35:：13”。

3.自定义GSON LocalDateDeserializer

  1. class LocalDateDeserializer implements JsonDeserializer < LocalDate > {
  2.     @Override
  3.     public LocalDate deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
  4.     throws JsonParseException {
  5.         return LocalDate.parse(json.getAsString(),
  6.             DateTimeFormatter.ofPattern("d-MMM-yyyy").withLocale(Locale.ENGLISH));
  7.     }
  8. }

4.自定义GSON LocalDateTimeDeserializer

  1. class LocalDateTimeDeserializer implements JsonDeserializer < LocalDateTime > {
  2.     @Override
  3.     public LocalDateTime deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
  4.     throws JsonParseException {
  5.         return LocalDateTime.parse(json.getAsString(),
  6.             DateTimeFormatter.ofPattern("d::MMM::uuuu HH::mm::ss").withLocale(Locale.ENGLISH));
  7.     }
  8. }

注册自定义序列化程序和反序列化程序

  1. GsonBuilder gsonBuilder = new GsonBuilder();
  2. gsonBuilder.registerTypeAdapter(LocalDate.class, new LocalDateSerializer());
  4. gsonBuilder.registerTypeAdapter(LocalDateTime.class, new LocalDateTimeSerializer());
  6. gsonBuilder.registerTypeAdapter(LocalDate.class, new LocalDateDeserializer());
  8. gsonBuilder.registerTypeAdapter(LocalDateTime.class, new LocalDateTimeDeserializer());
  10. Gson gson = gsonBuilder.setPrettyPrinting().create();

GSON自定义序列化和反序列化示例

让我们编写一个完整的示例来演示GSON自定义序列化器和反序列化器的用法。

  1. package net.javaguides.gson;
  3. import java.lang.reflect.Type;
  4. import java.time.LocalDate;
  5. import java.time.LocalDateTime;
  6. import java.time.format.DateTimeFormatter;
  7. import java.util.Locale;
  9. import com.google.gson.Gson;
  10. import com.google.gson.GsonBuilder;
  11. import com.google.gson.JsonDeserializationContext;
  12. import com.google.gson.JsonDeserializer;
  13. import com.google.gson.JsonElement;
  14. import com.google.gson.JsonParseException;
  15. import com.google.gson.JsonPrimitive;
  16. import com.google.gson.JsonSerializationContext;
  17. import com.google.gson.JsonSerializer;
  19. public class GSONCustomSerDerExample {
  20.     public static void main(String[] args) {
  21.         Order order = new Order();
  22.         order.setId(100);
  23.         order.setOrderName("Book purchase");
  24.         order.setOrderDesc("Java Head First");
  25.         order.setOrderCreatedDate(LocalDate.now());
  26.         order.setOrderCreatedDateTime(LocalDateTime.now());
  28.         GsonBuilder gsonBuilder = new GsonBuilder();
  29.         gsonBuilder.registerTypeAdapter(LocalDate.class, new LocalDateSerializer());
  31.         gsonBuilder.registerTypeAdapter(LocalDateTime.class, new LocalDateTimeSerializer());
  33.         gsonBuilder.registerTypeAdapter(LocalDate.class, new LocalDateDeserializer());
  35.         gsonBuilder.registerTypeAdapter(LocalDateTime.class, new LocalDateTimeDeserializer());
  37.         Gson gson = gsonBuilder.setPrettyPrinting().create();
  39.         // Convert to JSON
  40.         System.out.println(gson.toJson(order));
  42.         String orderJson = "{\r\n" + "  \"id\": 100,\r\n" + "  \"orderName\": \"Book purchase\",\r\n" +
  43.             "  \"orderDesc\": \"Java Head First\",\r\n" + "  \"orderCreatedDate\": \"26-Oct-2018\",\r\n" +
  44.             "  \"orderCreatedDateTime\": \"26::Oct::2018 11::09::05\",\r\n" +
  45.             "  \"orderCreatedZonedDateTime\": \"Oct 26 2018  11:09 AM\"\r\n" + "}";
  46.         // Convert to java objects
  47.         System.out.println(gson.fromJson(orderJson, Order.class));
  49.     }
  51. }
  53. class Order {
  54.     private int id;
  55.     private String orderName;
  56.     private String orderDesc;
  57.     private LocalDate orderCreatedDate;
  58.     private LocalDateTime orderCreatedDateTime;
  60.     public int getId() {
  61.         return id;
  62.     }
  64.     public void setId(int id) {
  65.         this.id = id;
  66.     }
  68.     public String getOrderName() {
  69.         return orderName;
  70.     }
  72.     public void setOrderName(String orderName) {
  73.         this.orderName = orderName;
  74.     }
  76.     public String getOrderDesc() {
  77.         return orderDesc;
  78.     }
  80.     public void setOrderDesc(String orderDesc) {
  81.         this.orderDesc = orderDesc;
  82.     }
  84.     public LocalDate getOrderCreatedDate() {
  85.         return orderCreatedDate;
  86.     }
  88.     public void setOrderCreatedDate(LocalDate orderCreatedDate) {
  89.         this.orderCreatedDate = orderCreatedDate;
  90.     }
  92.     public LocalDateTime getOrderCreatedDateTime() {
  93.         return orderCreatedDateTime;
  94.     }
  96.     public void setOrderCreatedDateTime(LocalDateTime orderCreatedDateTime) {
  97.         this.orderCreatedDateTime = orderCreatedDateTime;
  98.     }
  100.     @Override
  101.     public String toString() {
  102.         return "Order [id=" + id + ", orderName=" + orderName + ", orderDesc=" + orderDesc + ", orderCreatedDate=" +
  103.             orderCreatedDate + ", orderCreatedDateTime=" + orderCreatedDateTime + "]";
  104.     }
  105. }
  107. class LocalDateSerializer implements JsonSerializer < LocalDate > {
  108.     private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d-MMM-yyyy");
  110.     @Override
  111.     public JsonElement serialize(LocalDate localDate, Type srcType, JsonSerializationContext context) {
  112.         return new JsonPrimitive(formatter.format(localDate));
  113.     }
  114. }
  116. class LocalDateTimeSerializer implements JsonSerializer < LocalDateTime > {
  117.     private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d::MMM::uuuu HH::mm::ss");
  119.     @Override
  120.     public JsonElement serialize(LocalDateTime localDateTime, Type srcType, JsonSerializationContext context) {
  121.         return new JsonPrimitive(formatter.format(localDateTime));
  122.     }
  123. }
  125. class LocalDateDeserializer implements JsonDeserializer < LocalDate > {
  126.     @Override
  127.     public LocalDate deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
  128.     throws JsonParseException {
  129.         return LocalDate.parse(json.getAsString(),
  130.             DateTimeFormatter.ofPattern("d-MMM-yyyy").withLocale(Locale.ENGLISH));
  131.     }
  132. }
  134. class LocalDateTimeDeserializer implements JsonDeserializer < LocalDateTime > {
  135.     @Override
  136.     public LocalDateTime deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
  137.     throws JsonParseException {
  138.         return LocalDateTime.parse(json.getAsString(),
  139.             DateTimeFormatter.ofPattern("d::MMM::uuuu HH::mm::ss").withLocale(Locale.ENGLISH));
  140.     }
  141. }

输出：

  1. {
  2.   "id": 100,
  3.   "orderName": "Book purchase",
  4.   "orderDesc": "Java Head First",
  5.   "orderCreatedDate": "27-Oct-2018",
  6.   "orderCreatedDateTime": "27::Oct::2018 14::35::13"
  7. }
  8. Order [id=100, orderName=Book purchase, orderDesc=Java Head First, orderCreatedDate=2018-10-26, orderCreatedDateTime=2018-10-26T11:09:05]

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原文链接 : https://www.javaguides.net/2019/11/gson-localdatetime-localdate.html

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