对象序列化（Object Serialization）

让我们将Java对象序列化为Json文件，然后读取该Json文件以获取该对象。 在这个例子中，我们创建了一个Student类。 我们将创建一个student.json文件，该文件将具有Student对象的json表示。

例子 (Example)

在C:\》GSON_WORKSPACE创建名为GsonTester的Java类文件。

File: GsonTester.java

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+ " ]";
   }  
}

验证结果

使用javac编译器编译类如下 -

C:\GSON_WORKSPACE>javac GsonTester.java

现在运行GsonTester查看结果 -

C:\GSON_WORKSPACE>java GsonTester

验证输出

Student [ name: Mahesh, age: 10 ]