如何使用 Java 中的 Gson 库将 JSON 字符串写入文件?
javajsonobject oriented programmingprogramming
Gson 是一个可用于将 Java 对象转换为 JSON 表示的库。要使用的主要类是 Gson ，我们可以通过调用 new Gson() 来创建它，并且可以使用 GsonBuilder 类来创建 Gson 实例。
我们可以在以下示例中使用 Gson 类的 toJson() 方法将 JSON 字符串写入文件
示例
import java.io.*;
import com.google.gson.*;
public class JSONToFileTest {
public static void main(String[] args) throws IOException {
Gson gson = new Gson();
FileWriter fileWriter = new FileWriter("Student.json");
Student student = new Student("Raja", "Ramesh", 30, "Hyderabad");
gson.toJson(student, fileWriter);
fileWriter.close();
System.out.println("JSON string write to a file successfully");
System.out.println(student);
}
}
// Student classclass 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 +
" ]";
}
}
Student.json 文件
输出
JSON string write to a file successfully Student[ firstName = Raja, lastName = Ramesh, age = 30, address = Hyderabad ]
