Question

伙计我正在使用jqgrid ..这是我的文件

＆＃13;

{ 
	"rows":[
		{"OrderID":"10248","FromDate":"1996-07-04","CustomerID":"WILMK","ShipName":"Vins et alcools Chevalier","ToDate":"1996-07-05"},
		{"OrderID":"10249","FromDate":"1996-07-05","CustomerID":"TRADH","ShipName":"Toms Spezialit\u00e4ten","ToDate":"1996-07-17"},
		{"OrderID":"10250","FromDate":"1996-07-08","CustomerID":"HANAR","ShipName":"Hanari Carnes","ToDate":"1996-07-26"},
		{"OrderID":"10251","FromDate":"1996-07-08","CustomerID":"VICTE","ShipName":"Victuailles en stock","ToDate":"1996-08-01"},
		{"OrderID":"10277","FromDate":"1996-08-09","CustomerID":"MORGK","ShipName":"Morgenstern Gesundkost","ToDate":"1996-08-12"}
	]
}

＆＃13;

但我希望它像

＆＃13;

{ 
	"rows":[
		{"OrderID":"10248","FromDate":"1996-07-04","CustomerID":"WILMK","ShipName":"Vins et alcools Chevalier","ToDate":"1996-07-05"},
		{"OrderID":"10249","FromDate":"1996-07-05","CustomerID":"TRADH","ShipName":"Toms Spezialit\u00e4ten","ToDate":"1996-07-17"},
		{"OrderID":"10250","FromDate":"1996-07-08","CustomerID":"HANAR","ShipName":"Hanari Carnes","ToDate":"1996-07-26"},
		{"OrderID":"10251","FromDate":"1996-07-08","CustomerID":"VICTE","ShipName":"Victuailles en stock","ToDate":"1996-08-01"},
		{"OrderID":"10277","FromDate":"1996-08-09","CustomerID":"MORGK","ShipName":"Morgenstern Gesundkost","ToDate":"1996-08-12"},
        {"OrderID":"10261","FromDate":"1996-07-19","CustomerID":"QUEDE","ShipName":"Que Del\u00edcia","ToDate":"1996-08-09"} // added row
	]
}

＆＃13;

任何帮助plzz .. thansk提前

Answer 1

从你的问题看来，你想在数组中的json文件中添加另一个对象。所以，这是一个解决方案。

使用您用于从文件读取/写入json的任何库来读取您的json文件。
在特定列表中添加新对象。
以过写模式将其写入文件。

Answer 2

首先解析您的JSON内容：

String input = "{\"rows\":[{\"OrderID\":\"10248\"}]}";
JSONObject json = new JSONObject(input);

然后从解析的内容中获取数组：

JSONArray arr = json.getJSONArray("rows");

将对象转换为添加到JSON：

JSONObject newRow  = new JSONObject();
newRow.accumulate("OrderID", 10000);
// Do the same for all your attributes

最后将新行添加到数组中以获取更新的JSON：

arr.put(newRow);
String updatedJSON = json.toString();

Answer 3

您想在数组中的json文件中添加另一个对象。所以，这是一个解决方案。

阅读json文件。
将您的密钥row作为JSONArray并将其存储到字符串中。

构建一个班级Order。

 Class Order
 {
 String OrderID ;
 String FromDate ;
 String CustomerID 
 String ShipName;
 String ToDate;
}

在特定列表中添加新对象。

//import Class (add a jar com.fasterxml.jackson to your project)
import com.fasterxml.jackson.databind.ObjectMapper;


// Here I assume that "applicationArray" contains the Array .
 String applicationArray = "[
        {"OrderID":"10248","FromDate":"1996-07-04","CustomerID":"WILMK","ShipName":"Vins et alcools Chevalier","ToDate":"1996-07-05"},
        {"OrderID":"10249","FromDate":"1996-07-05","CustomerID":"TRADH","ShipName":"Toms Spezialit\u00e4ten","ToDate":"1996-07-17"},
        {"OrderID":"10250","FromDate":"1996-07-08","CustomerID":"HANAR","ShipName":"Hanari Carnes","ToDate":"1996-07-26"},
        {"OrderID":"10251","FromDate":"1996-07-08","CustomerID":"VICTE","ShipName":"Victuailles en stock","ToDate":"1996-08-01"},
        {"OrderID":"10277","FromDate":"1996-08-09","CustomerID":"MORGK","ShipName":"Morgenstern Gesundkost","ToDate":"1996-08-12"},
        {"OrderID":"10261","FromDate":"1996-07-19","CustomerID":"QUEDE","ShipName":"Que Del\u00edcia","ToDate":"1996-08-09"} // added row
    ]"

ObjectMapper mapper = new ObjectMapper();
List<Order> obj_listOrder = mapper.readValue(applicationArray, mapper.getTypeFactory().constructCollectionType(List.class, DeviceApplication.class));

现在再向列表中添加一个元素。

向List中添加一个元素。替换您的文件的内容。

在java中将记录添加到文件中

3 个答案: