在開發過程中，我們常常需要解析 JSON 數據。尤其在移動端開發中，復雜的 JSON 數據結構和嵌套層次較多是很常見的。

下面我們通過一個具體的例子來演示如何解析復雜 JSON 數據：

{
"code": 200,
"data": {
"page": 1,
"pageSize": 10,
"total": 1000,
"list": [
{
"id": 1,
"name": "張三",
"age": 18,
"gender": "male",
"phone": "13888888888",
"email": "zhangsan@qq.com",
"address": {
"province": "廣東",
"city": "深圳",
"district": "福田"
},
"score": [
{
"subject": "語文",
"score": 80
},
{
"subject": "數學",
"score": 90
},
]
},
{
"id": 2,
"name": "李四",
"age": 20,
"gender": "female",
"phone": "13999999999",
"email": "lisi@qq.com",
"address": {
"province": "廣東",
"city": "廣州",
"district": "天河"
},
"score": [
{
"subject": "語文",
"score": 85
},
{
"subject": "數學",
"score": 95
},
]
},
]
}
}

我們可以通過以下代碼來解析這份 JSON 數據：

try {
JSONObject jsonObject = new JSONObject(jsonData);
int code = jsonObject.getInt("code");
JSONObject data = jsonObject.getJSONObject("data");
int page = data.getInt("page");
int pageSize = data.getInt("pageSize");
int total = data.getInt("total");
JSONArray list = data.getJSONArray("list");
for (int i = 0; i< list.length(); i++) {
JSONObject item = list.getJSONObject(i);
int id = item.getInt("id");
String name = item.getString("name");
int age = item.getInt("age");
String gender = item.getString("gender");
String phone = item.getString("phone");
String email = item.getString("email");
JSONObject address = item.getJSONObject("address");
String province = address.getString("province");
String city = address.getString("city");
String district = address.getString("district");
JSONArray score = item.getJSONArray("score");
for (int j = 0; j< score.length(); j++) {
JSONObject subItem = score.getJSONObject(j);
String subject = subItem.getString("subject");
int scoreValue = subItem.getInt("score");
// TODO 處理數據
}
}
} catch (JSONException e) {
e.printStackTrace();
}

通過以上代碼，我們可以成功解析出整個 JSON 數據，并且取出其中的數據，進行處理。但需要注意的是：如果 JSON 數據結構過于復雜，我們需要耐心和細心，仔細檢查每個嵌套層次的數據格式和命名。只有做到充分理解數據結構和分析數據規律，才能完成復雜 JSON 解析工作。