在Java中使用Gson函式庫將Java物件轉換為JSON？

Gson 是一個由 Google 建立的用於 Java 的 json 函式庫，它可以用來產生 JSON。透過使用 Gson，我們可以產生 JSON 並將一個 bean/ java 物件轉換為 JSON 物件。我們可以呼叫 Gson 類別的 toJson() 方法將 Java 物件轉換為 JSON 物件。

語法

public java.lang.String toJson(java.lang.Object src)

範例

import com.google.gson.Gson;
public class ConvertJavaObjectToJSONTest {
   public static void main(String[] args) {
      <strong>Gson </strong>gson = new Gson();
      Student student = new Student("Raja", "Ramesh", 30, "Hyderabad");
      System.out.println(gson<strong>.toJson(student)); </strong><strong>// converts java object to json object.</strong>
   }
}
// student class<strong>
</strong>class Student {
   private String firstName;
   private String lastName;
   private int age;
   private String address;
   public Student(String firstName, String lastName, int age, String address) {
      super();
      this.firstName = firstName;
      this.lastName = lastName;
      this.age = age;
      this.address = address;
   }
   public String getFirstName() {
      return firstName;
   }
   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }
   public String getLastName() {
      return lastName;
   }
   public void setLastName(String lastName) {
      this.lastName = lastName;
   }
   public int getAge() {
      return age;
   }
   public void setAge(int age) {
      this.age = age;
   }
   public String getAddress() {
      return address;
   }
   public void setAddress(String address) {
      this.address = address;
   }
   public String toString() {
      return "Student[ " +
               " firstName = " + firstName +
               ", lastName = " + lastName +
               ", age = " + age +
               ", address = " + address +
               " ]";
   }
}

輸出

{"firstName":"Raja","lastName":"Ramesh","age":30,"address":"Hyderabad"}

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