使用jsonPath解析多層json資料
第一步，匯入jsonPath所需jar包（json-path-0.8.1.jar，json-smart-1.1.1.jar，commons-lang-2.6.jar），下載地址：https://download.csdn.net/download/cling_snail/10531694。
第二步，使用jsonPath解析資料，下面是jsonPath的簡單語法和示例：
json資料：
{
"store": {
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
},
"expensive": 10
}以上是一些簡單的jsonpath語法示例。
下面是我專案中使用的jsonpath，因為我的專案是整合高德地圖，通過高德api介面傳送地址，獲取到高德返回的地址經緯度，所以需要解析高德返回的json資料。
mian方法中呼叫介面：
//傳送 POST 請求
String sr=HttpRequest.sendPost("https://restapi.amap.com/v3/geocode/geo", "address=天津市河東區大王莊六緯路與十四徑路交口&output=JSON&key=自己在高德上申請的web端key值");
//獲取高德地圖伺服器返回的json格式資料
System.out.println("狀態:"+json2String(sr,"$..status")); //獲取到json中所有的status值
System.out.println("地址:"+json2String(sr,"$..formatted_address")); //獲取到json中所有的formatted_address值
System.out.println("經緯度:"+json2String(sr,"$..location")); //獲取到json中所有的location值
其中的sr為json格式的資料：{"status":"1","info":"OK","infocode":"10000","count":"1","geocodes":[{"formatted_address":"天津市河東區六緯路/十四徑路","province":"天津市","citycode":"022","city":"天津市","district":"河東區","township":[],"neighborhood":{"name":[],"type":[]},"building":{"name":[],"type":[]},"adcode":"120102","street":[],"number":[],"location":"117.228002,39.116834","level":"道路交叉路口"}]}
解析結果：
好了，此時就能解析出json資料了，是不是很簡單，假如不使用jsonPath，就要通過一層一層的遍歷獲取json資料中的值，增加了程式碼的複雜度和工作量。