android之Json解析

Json是一種與XML功能類似的作為資料轉送的工具，

解析區別：Json一行行讀取解析，而XML先整體後局部。

Json檔案一般格式如下：

{    "城市代碼": [        {            "省": "北京",            "市": [                {                    "市名": "北京",                    "編碼": "101010100"                },                {                    "市名": "朝陽",                    "編碼": "101010300"                },                {                    "市名": "順義",                    "編碼": "101010400"                },                {                    "市名": "懷柔",                    "編碼": "101010500"                },                {                    "市名": "通州",                    "編碼": "101010600"                },                {                    "市名": "昌平",                    "編碼": "101010700"                },                {                    "市名": "延慶",                    "編碼": "101010800"                },                {                    "市名": "丰台",                    "編碼": "101010900"                },                {                    "市名": "石景山",                    "編碼": "101011000"                },                {                    "市名": "大興",                    "編碼": "101011100"                },                {                    "市名": "房山",                    "編碼": "101011200"                },                {                    "市名": "密雲",                    "編碼": "101011300"                },                {                    "市名": "門頭溝",                    "編碼": "101011400"                },                {                    "市名": "平穀",                    "編碼": "101011500"                },                {                    "市名": "八達嶺",                    "編碼": "101011600"                },                {                    "市名": "佛爺頂",                    "編碼": "101011700"                },                {                    "市名": "湯河口",                    "編碼": "101011800"                },                {                    "市名": "密雲上甸子",                    "編碼": "101011900"                },                {                    "市名": "齋堂",                    "編碼": "101012000"                },                {                    "市名": "霞雲嶺",                    "編碼": "101012100"                },                {                    "市名": "北京城區",                    "編碼": "101012200"                },                {                    "市名": "海澱",                    "編碼": "101010200"                }            ]        },        {            "省": "天津市",            "市": [                {                    "市名": "天津",                    "編碼": "101030100"                },                {                    "市名": "寶坻",                    "編碼": "101030300"                },                {                    "市名": "東麗",                    "編碼": "101030400"                },                {                    "市名": "西青",                    "編碼": "101030500"                },                {                    "市名": "北辰",                    "編碼": "101030600"                },                {                    "市名": "薊縣",                    "編碼": "101031400"                },                {                    "市名": "漢沽",                    "編碼": "101030800"                },                {                    "市名": "靜海",                    "編碼": "101030900"                },                {                    "市名": "津南",                    "編碼": "101031000"                },                {                    "市名": "塘沽",                    "編碼": "101031100"                },                {                    "市名": "大港",                    "編碼": "101031200"                },                {                    "市名": "武清",                    "編碼": "101030200"                },                {                    "市名": "寧河",                    "編碼": "101030700"                }            ]        },        {            "省": "上海",            "市": [                {                    "市名": "上海",                    "編碼": "101020100"                },                {                    "市名": "寶山",                    "編碼": "101020300"                },                {                    "市名": "嘉定",                    "編碼": "101020500"                },                {                    "市名": "南匯",                    "編碼": "101020600"                },                {                    "市名": "浦東",                    "編碼": "101021300"                },                {                    "市名": "青浦",                    "編碼": "101020800"                },                {                    "市名": "松江",                    "編碼": "101020900"                },                {                    "市名": "奉賢",                    "編碼": "101021000"                },                {                    "市名": "崇明",                    "編碼": "101021100"                },                {                    "市名": "徐家匯",                    "編碼": "101021200"                },                {                    "市名": "閔行",                    "編碼": "101020200"                },                {                    "市名": "金山",                    "編碼": "101020700"                }            ]        }    ]}

var people = { "programmers": [ { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },　　{ "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" },　　{ "firstName": "Elliotte", "lastName":"Harold", "email": "cccc" }　　],　　"authors": [　　{ "firstName": "Isaac", "lastName": "Asimov", "genre": "science fiction" },　　{ "firstName": "Tad", "lastName": "Williams", "genre": "fantasy" },　　{ "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" }　　],　　"musicians": [　　{ "firstName": "Eric", "lastName": "Clapton", "instrument": "guitar" },　　{ "firstName": "Sergei", "lastName": "Rachmaninoff", "instrument": "piano" }　　] }

android解析Json關鍵代碼舉例：

super.onCreate(savedInstanceState);super.setContentView(R.layout.main);mButton = (Button) findViewById(R.id.mybut) ;String str = "{\"data\":[{\"id\":1,\"name\":\"Anjoy\",\"age\":28},"+ "{\"id\":2,\"name\":\"鄭霞\",\"age\":28}],\"company\":\"騰銳資訊技術有限公司\"}";StringBuffer buf = new StringBuffer() ;try {Map<String, Object> result = this.parseJson(str) ;// 解析json資料文本buf.append("公司名稱：" + result.get("company") + "\n");List<Map<String,Object>> all = (List<Map<String,Object>>) result.get("data") ; Iterator<Map<String,Object>> iter = all.iterator() ;while(iter.hasNext()){Map<String,Object> map = iter.next() ;buf.append("ID編號：" + map.get("id") + "，姓名：" + map.get("name")+ "，年齡：" + map.get("age") + "\n");}} catch (Exception e) {e.printStackTrace();}mButton.setText(buf) ;}private Map<String, Object> parseJson(String data) throws Exception {Map<String, Object> allMap = new HashMap<String, Object>();JSONObject allData = new JSONObject(data) ;// 全部的內容變為一個項allMap.put("company", allData.getString("company")); // 取出項JSONArray jsonArr = allData.getJSONArray("data"); // 取出數組List<Map<String,Object>> all = new ArrayList<Map<String,Object>>() ;for (int i = 0; i < jsonArr.length(); i++) {Map<String, Object> map = new HashMap<String, Object>();JSONObject jsonObj = jsonArr.getJSONObject(i);map.put("id", jsonObj.getInt("id"));map.put("name", jsonObj.getString("name"));map.put("age", jsonObj.getInt("age"));all.add(map);}allMap.put("data", all) ;return allMap;}