您可以创建一个TypeAdapter
,是这样的:
public static class StudentAdapter extends TypeAdapter<Student> {
public void write(JsonWriter writer, Student student)
throws IOException {
if (student == null) {
writer.nullValue();
return;
}
writer.beginObject();
writer.name("name");
writer.value(student.name);
writer.name("sequence");
writeSequence(writer, student.sequence);
writer.endObject();
}
private void writeSequence(JsonWriter writer, List<Integer> seq)
throws IOException {
writer.beginObject();
for (int i = 0; i < seq.size(); i++) {
writer.name("index_" + i);
writer.value(seq.get(i));
}
writer.endObject();
}
@Override
public Student read(JsonReader in) throws IOException {
// This is left blank as an exercise for the reader
return null;
}
}
然后用
GsonBuilder b = new GsonBuilder();
b.registerTypeAdapter(Student.class, new StudentAdapter());
Gson g = b.create();
注册它如果你运行这个用一个例子学生:
Student s = new Student();
s.name = "John Smith";
s.sequence = ImmutableList.of(1,3,4,7); // This is a guava method
System.out.println(g.toJson(s));
输出:
{"name":"John Smith","sequence":{"index_0":1,"index_1":3,"index_2":4,"index_3":7}}
//这是留给读者的一个练习......不错的一个:) @ durron597 – Kaushik
@Kaushik他只问如何序列化,而不是反序列化:-) – durron597
很酷的答案,它总是很棒学习新东西! – epoch