public class GsonDemo {

    public static void main(String[] args) {
        Map map = new HashMap();
        map.put("name", "nam1");
        map.put("age", "12");

        Gson gson = new Gson();

        // 把java物件轉換成Json字串。
        String jsonStr = gson.toJson(map);
        System.out.println(jsonStr); // {"name":"nam1","age":"12"}
 


        // json格式的字串
        String str = "[{'name':'kevin','age':25},{'name':'cissy','age':24}]";

        // 建立一個JsonParser
        JsonParser parser = new JsonParser();

        // 通過JsonParser物件可以把json格式的字串解析成一個JsonElement物件
        JsonElement el = parser.parse(str);


        // 把JsonElement物件轉換成JsonArray
 

        JsonArray jsonArray = null;
        if (el.isJsonArray()) {
            jsonArray = el.getAsJsonArray();
        }

        // 遍歷JsonArray物件
        DomeBean field = null;
        Iterator it = jsonArray.iterator();
        while (it.hasNext()) {
            JsonElement e = (JsonElement) it.next();
            // JsonElement轉換為JavaBean物件
 

            field = gson.fromJson(e, DomeBean.class);
            System.out.println(field);
            //DomeBean [name=kevin, age=25]
            //DomeBean [name=cissy, age=24]
        }
    }

}

class DomeBean {
    private String name;
    private Integer age;


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

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

}