????使用java進行網頁抓取時，有時會直接獲取到json串，json串要獲取的數據嵌套復雜，這里自己寫一個遞歸的方式進行解析指定名稱的數據，進行記錄，以便日后復用。

????原有json串：

{"total":?3,"class":?"二年級","members":?[{"age":?18,"name":?"張三","course":[{"Chinese":"123","Maths":"121","English":"110"}]},?{"age":?19,"name":?"李四","course":[{"Chinese":"118","Maths":"129","English":"130"}]},?{"age":?18,"name":?"王麻子","course":[{"Chinese":"133","Maths":"111","English":"134"}]}] }

????java遞歸解析方法：

import?org.json.JSONObject; import?org.json.JSONArray;/***?*?@param?returnObject?返回的數據List*?@param?object?傳入的json串*?@param?keys?需要解析的節點數組，按順序組成數組*?@param?index?index==keys.length為基線條件，index起始為0*/ private?static?void?getData(List<Object>?returnObject,Object?object,String[]?keys,int?index){if?(index==keys.length){returnObject.add(object);return;}if?(object?instanceof?JSONObject){if?(!((JSONObject)?object).has(keys[index])){return?;}Object?object1=((JSONObject)?object).get(keys[index]);getData(returnObject,object1,keys,index+1);}?else?if?(object?instanceof?JSONArray){JSONArray?jsonArray=(JSONArray)?object;for?(Object?jsonObject:jsonArray){getData(returnObject,jsonObject,keys,index);}} }

????遞歸調用方法：

public?static?void?main(String[]?args)?{String?jsonStr="{\n"?+"\t\"total\":?3,\n"?+"\t\"class\":?\"二年級\",\n"?+"\t\"members\":?[{\n"?+"\t\t\"age\":?18,\n"?+"\t\t\"name\":?\"張三\",\n"?+"\t\t\"course\":[{\n"?+"\t\t\t\"Chinese\":\"123\",\n"?+"\t\t??\t\"Maths\":\"121\",\n"?+"\t\t??\t\"English\":\"110\"\n"?+"\t\t}]\n"?+"\t},?{\n"?+"\t\t\"age\":?19,\n"?+"\t\t\"name\":?\"李四\",\n"?+"\t\t\"course\":[{\n"?+"\t\t\t\"Chinese\":\"118\",\n"?+"\t\t??\t\"Maths\":\"129\",\n"?+"\t\t??\t\"English\":\"130\"\n"?+"\t\t}]\n"?+"\t},?{\n"?+"\t\t\"age\":?18,\n"?+"\t\t\"name\":?\"王麻子\",\n"?+"\t\t\"course\":[{\n"?+"\t\t\t\"Chinese\":\"133\",\n"?+"\t\t??\t\"Maths\":\"111\",\n"?+"\t\t??\t\"English\":\"134\"\n"?+"\t\t}]\n"?+"\t}]\n"?+"}";List<Object>?returnObject=new?ArrayList<>();getData(returnObject,new?JSONObject(jsonStr),"members,course".split(","),0);System.out.println(returnObject);returnObject=new?ArrayList<>();getData(returnObject,new?JSONObject(jsonStr),"members,course,Chinese".split(","),0);System.out.println(returnObject); } 輸出結果： [[{"Maths":"121","English":"110","Chinese":"123"}],?[{"Maths":"129","English":"130","Chinese":"118"}],?[{"Maths":"111","English":"134","Chinese":"133"}]] [123,?118,?133]

轉載于:https://blog.51cto.com/zuohao1990/2295757

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