将json字符串转换为list或map

我在服务器端获得了一个json字符串，如下所示

[ {"projectFileId":"8547", "projectId":"8235", "fileName":"1", "application":"Excel", "complexity":"NORMAL", "pageCount":"2", "targetLanguages":" ar-SA", "Id":"8547" }, {"projectFileId":"8450", "projectId":"8235", "fileName":"Capacity Calculator.pptx", "application":"Powerpoint", "complexity":"NORMAL", "pageCount":"100", "targetLanguages":" ar-LB, ar-SA", "Id":"8450" } ] 

我想将这个字符串转换为arraylist或map尽可能使我可以迭代它并获取字段值。

Answer 1

您可以使用GSON库 。 只需使用Gson#fromJson()方法将JSON字符串转换为Java Object。

示例代码：

 BufferedReader reader = new BufferedReader(new FileReader(new File("json.txt"))); Gson gson = new Gson(); Type type = new TypeToken>>() {}.getType(); ArrayList> data = gson.fromJson(reader, type); // convert back to JSON string from object System.out.println(new GsonBuilder().setPrettyPrinting().create().toJson(data)); 

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您可以创建一个POJO类，将其直接转换为POJO clas对象列表，以便轻松访问它。

示例代码：

 class PojectDetail{ private String projectFileId; private String projectId; private String fileName; private String application; private String complexity; private String pageCount; private String targetLanguages; private String Id; // getter & setter } Gson gson = new Gson(); Type type = new TypeToken>() {}.getType(); ArrayList data = gson.fromJson(reader, type);