使用JSONObject將json檔案轉化為物件，最主要的步驟就是：

    1.將json檔案轉化為字串，這裡用到了檔案流的讀取

    2.引入json-lib包，呼叫裡面的方法。

比較簡單，只當做一個記錄

1.貼出test1.js檔案

{
  "province":[{"cityId":18,"cityName":"西安"},{"cityId":53,"cityName":"廣州"}]
}

2.貼出實體類檔案

public class Province {
    private String cityId;
    private String cityName;
    public 
 
String getCityId() {
        return cityId;
}

    public void setCityId(String cityId) {
        this.cityId = cityId;
}

    public String getCityName() {
        return cityName;
}

    public void setCityName(String cityName) {
        this.cityName = cityName;
}

    @Override
public String toString
 
() {
        return "Province{" +
                "cityId='" + cityId + '\'' +
                ", cityName='" + cityName + '\'' +
                '}';
}
}

下面是主要的方法

public class Main {

    public static void main(String[] args)throws Exception {
        String s = fileRead();
JSONObject jsonObject = new 
 
JSONObject().fromObject(s);
List<Map<String, Object>> provinceList = JsonParseUtils.toList(jsonObject.get("province"));
ArrayList<Province> provinces = new ArrayList<>();
        for (Map<String, Object> stringObjectMap : provinceList) {
            Province province = new Province();
province.setCityId(stringObjectMap.get("cityId").toString());
province.setCityName(stringObjectMap.get("cityName").toString());
provinces.add(province);
}

        for (Province province : provinces) {
            System.out.println(province);
}

    }

    public static String fileRead() throws Exception {
        File file = new File("test.json");//定義一個file物件，用來初始化FileReader
FileReader reader = new FileReader(file);//定義一個fileReader物件，用來初始化BufferedReader
BufferedReader bReader = new BufferedReader(reader);//new一個BufferedReader物件，將檔案內容讀取到快取
StringBuilder sb = new StringBuilder();//定義一個字串快取，將字串存放快取中
String s = "";
        while ((s =bReader.readLine()) != null) {//逐行讀取檔案內容，不讀取換行符和末尾的空格
sb.append(s + "\n");//將讀取的字串新增換行符後累加存放在快取中
System.out.println(s);
}
        bReader.close();
String str = sb.toString();
System.out.println(str );
        return str;
}

/***
 * 將物件轉換為List>
 * @param object
* @return
*/
// 返回非實體型別(Map)的List
public static List<Map<String, Object>> toList(Object object)
{
    List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
JSONArray jsonArray = JSONArray.fromObject(object);
    for (Object obj : jsonArray)
    {
        JSONObject jsonObject = (JSONObject) obj;
Map<String, Object> map = new HashMap<String, Object>();
Iterator it = jsonObject.keys();
        while (it.hasNext())
        {
            String key = (String) it.next();
Object value = jsonObject.get(key);
map.put((String) key, value);
}
        list.add(map);
}
    return list;
}

這裡我就不做過多的說明了，總之思路就是：new一個JsonObject物件，將讀取的檔案流String轉化為jJSONObject，然後new一個JSONArray物件，將object轉化為陣列物件，將陣列以鍵值對的方式放在map中，然後將map設定到物件中。

so easy!!!