Gson 是一个由 Google 创建的用于 Java 的 json 库，它可以用来生成 JSON。通过使用 Gson，我们可以生成 JSON 并将一个 bean/ java 对象转换为 JSON 对象。我们可以调用 Gson 类的 toJson() 方法将 Java 对象转换为 JSON 对象。
public java.lang.String toJson(java.lang.Object src)
import com.google.gson.Gson; public class ConvertJavaObjectToJSONTest { public static void main(String[] args) { Gson gson = new Gson(); Student student = new Student("Raja", "Ramesh", 30, "Hyderabad"); System.out.println(gson.toJson(student)); // converts java object to json object. } } // student class 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 + " ]"; } }
{"firstName":"Raja","lastName":"Ramesh","age":30,"address":"Hyderabad"}
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