1.编写核心类

MainApp：

package com.yiidian.gson;import com.google.gson.Gson;import com.google.gson.GsonBuilder;import java.io.*;public class MainApp { public static void main(String args[]) { MainApp tester = new MainApp(); try { Student student = new Student(); student.setAge(10); student.setName("eric"); tester.writeJSON(student); Student student1 = tester.readJSON(); System.out.println(student1); } catch(FileNotFoundException e) { e.printStackTrace(); } catch(IOException e) { e.printStackTrace(); } } //把Java对象存储student.json文件 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(); } //从student.json文件读取Java对象 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+ " ]"; }}

2 运行测试

控制台输出：

项目下生成student.json文件

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