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一、Delphi读取JSON数组是非常方便的,首先我们网上找一段JSON数据
复制代码{ "error": 0, "status": "success", "date": "2014-03-04", "results": [{ "currentCity": "成都", "weather_data": [{ "date": "周二(今天, 实时:12℃)", "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/duoyun.png", "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/duoyun.png", "weather": "多云", "wind": "北风微风", "temperature": "15 ~ 6℃" }, { "date": "周三", "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/yin.png", "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/xiaoyu.png", "weather": "阴转小雨", "wind": "北风微风", "temperature": "14 ~ 7℃" }, { "date": "周四", "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/xiaoyu.png", "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/xiaoyu.png", "weather": "小雨", "wind": "北风微风", "temperature": "12 ~ 7℃" }, { "date": "周五", "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/xiaoyu.png", "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/xiaoyu.png", "weather": "小雨", "wind": "南风微风", "temperature": "9 ~ 6℃" }] }]}复制代码
二、我们用Delphi读取,代码如下:
复制代码uses REST.Json, System.Json, System.Types, System.Json.Types, System.Json.Writers, System.Json.Builders, System.Json.Serializers;
procedure TForm1.Button7Click(Sender: TObject);var m_JSONObject: TJSONObject; m_Item1, m_Item2, m_Item3, m_Item4: TJSONValue; m_Weather: TJSONArray; m_Str: string; m_Result: string; I: Integer;begin // 读JSON文本 m_Str := Trim(Memo1.text); // 防止乱码 m_JSONObject := TJSONObject.ParseJSONValue(TEncoding.UTF8.GetBytes(m_Str), 0) as TJSONObject; // 读取results的数据 m_JSONObject := (m_JSONObject.GetValue('results') as TJSONArray).Get(0) as TJSONObject; // 读取results中的weather_data的数组 m_Weather := m_JSONObject.GetValue('weather_data') as TJSONArray; // 循环读天气数据 for I := 0 to m_Weather.size - 1 do begin // 取天气值 m_Item1 := (m_Weather.Get(I) as TJSONObject).GetValue('date'); m_Item2 := (m_Weather.Get(I) as TJSONObject).GetValue('weather'); m_Item3 := (m_Weather.Get(I) as TJSONObject).GetValue('wind'); m_Item4 := (m_Weather.Get(I) as TJSONObject).GetValue('temperature'); // 输出 Memo2.Lines.Add(Format('【日期%s】,【天气%s】,【风速%s】,【温度%s】', [m_Item1.Value, m_Item2.Value, m_Item3.Value, m_Item4.Value])); end; m_JSONObject.Free;end;复制代码三、运行一下,结果如下:
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