我们将一个Java对象序列化为一个Json文件,然后读取该Json文件以获取对象。 在这个例子中,创建一个Student
类。 然后将对象列化后存储在student.json
文件中,该文件将具有Student
对象的json表示形式。
示例
在中创建一个名为GsonTester
的Java类文件,参考以下代码 -
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
public class GsonTester {
public static void main(String args[]) {
GsonTester tester = new GsonTester();
try {
Student student = new Student();
student.setAge(10);
student.setName("Mahesh");
tester.writeJSON(student);
Student student1 = tester.readJSON();
System.out.println(student1);
}
catch(FileNotFoundException e) {
e.printStackTrace();
}
catch(IOException e) {
e.printStackTrace();
}
}
private void writeJSON(Student student) throws IOException {
GsonBuilder builder = new GsonBuilder();
Gson gson = builder.create();
FileWriter writer = new FileWriter("student.json");
writer.write(gson.toJson(student));
writer.close();
}
private Student readJSON() throws FileNotFoundException {
GsonBuilder builder = new GsonBuilder();
Gson gson = builder.create();
BufferedReader bufferedReader = new BufferedReader(
new FileReader("student.json"));
Student student = gson.fromJson(bufferedReader, Student.class);
return student;
}
}
class Student {
private String name;
private int age;
public Student(){}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String toString() {
return "Student [ name: "+name+", age: "+ age+ " ]";
}
}
执行上面示例代码,得到以下结果 -
Student [ name: Mahesh, age: 10 ]