记录以下关于生成json字符串的坑

尝试了三种，但是其中有一种有坑，如下：

private void createStringJson(){
        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject.put("name","张三");
            //粉丝是个数组,其实就是嵌套json
            JSONObject book1 = new JSONObject();
            book1.put("bookname","麦田里的守望者");
            book1.put("id","1000001");

            JSONObject book2= new JSONObject();
            book2.put("bookname","月亮与六便士");
            book2.put("id","1000002");

            //从此处可以看出其实list和json也是互相转换的
            List<JSONObject> books= new ArrayList<JSONObject>();
            jsonObjects.add(book1);
            jsonObjects.add(book2);
            jsonObject.put("books",books);

            Log.d("aaaaaaaaaaaaaaa",jsonObject+"");

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

上面的jsonObject打印，标签books对应的json是带引号的。

下面的这种方法，标签books对应的json是不带引号的：

//第二种方法,用map方式
private void mapCreateJson(){
    Map<String,Object> map = new HashMap<String,Object>();
    map.put("name","张三");
    Map<String,Object> book1 = new HashMap<String,Object>();
    book1.put("bookname","麦田里的守望者");
    book1.put("id","1000001");
    Map<String,Object> book2 = new HashMap<String,Object>();
    book2.put("bookname","月亮与六便士");
    book2.put("id","1000002");
    List<Map> books = new ArrayList<Map>();
    books.add(book1);
    books.add(book2);
    map.put("books",books);
    Log.d("aaaaaaaaaaaaaaa",new JSONObject(map)+"");
}

第三种方法，也是不带引号的：

private void beanCreateJson(){
    User actor = new User();
    actor.setName("张三");
    Map<String,Object> book1 = new HashMap<String,Object>();
    book1.put("bookname","麦田里的守望者");
    book1.put("id","1000001");
    Map<String,Object> book2 = new HashMap<String,Object>();
    book2.put("bookname","月亮与六便士");
    book2.put("id","1000002");
    List<Map> books = new ArrayList<Map>();
    books.add(book1);
    books.add(book2);
    actor.setBooks(books);
    Log.d("aaaaaaaaaaaaaaa", GsonUtil.beanToString(actor));
}

GsonUtil中beanToString的方法：

import com.google.gson.Gson;

private static Gson gson = new Gson();

public static String beanToString(Object object) {
    String gsonString = null;
    if (gson != null) {
        gsonString = gson.toJson(object);
    }
    return gsonString;
}