gsonによる各種Javaオブジェクトとjsonの変換のサポート

package com.test.json;

import java.util.ArrayList;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;
import com.google.gson.reflect.TypeToken;

public class GsonTest {
	public static void main(String[] args) {
		Gson gson = new Gson();

		Student s1 = new Student();
		Student s2 = new Student();

		List<Student> list = new ArrayList<Student>();
		list.add(s1);
		list.add(s2);

		Wrapper wrapper = new Wrapper();
		wrapper.setList(list);

		// bean -> json
		String jsonFromBean = gson.toJson(s1);
		String jsonFromList = gson.toJson(list);
		String jsonFromWrapper = gson.toJson(wrapper);

		System.out.println(jsonFromBean);
		System.out.println(jsonFromList);
		System.out.println(jsonFromWrapper);

		// json -> bean
		Student beanFromJson = gson.fromJson(jsonFromBean, Student.class);
		List<Student> listFromJson = gson.fromJson(jsonFromList,
				new TypeToken<List<Student>>() {
				}.getType());//       
		Wrapper wrapperFromJson = gson.fromJson(jsonFromWrapper, Wrapper.class);

		System.out.println(beanFromJson);
		System.out.println(listFromJson);
		System.out.println(wrapperFromJson);
	}

}

class Student {
	@SerializedName("  ")
	private String name = "+++";

	@SerializedName("  ")
	private String sex = " ";

	@Override
	public String toString() {
		return "Student [name=" + name + ", sex=" + sex + "]";
	}

}

class Wrapper {

	@SerializedName("    ")
	private List<Student> list;

	public void setList(List<Student> list) {
		this.list = list;
	}

	@Override
	public String toString() {
		return "Wrapper [list=" + list + "]";
	}

}