1.編寫核心類
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對象存儲student.json檔案
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();
}
//從student.json檔案讀取Java對象
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 運作測試
控制台輸出：
項目下生成student.json檔案
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