我正在尝试从我的JSONObject中提取Key和值。但我无法做到这一点。这是JSON：
[{"id":["5"]},{"Tech":["Java"]}]
最初是一个字符串。我已使用：
将其转换为JSONObjectJSONObject jsonObj = new JSONObject("[{"id":["5"]},{"Tech":["Java"]}]");
然后我试图通过以下方式获得关键和价值：
jsonObj.getString("id");
但是它让我无效。任何人都可以帮助我吗？
答案 0 :(得分：7)
答案 1 :(得分：1)
您发送的参数是JsonArray并引用JsonObject。正确的方法是
JSONObject jsonObj = new JSONObject("{'id':['5','6']},{'Tech':['Java']}");
System.out.println(jsonObj.getString("id"));
JSONArray jsonArray = new JSONArray("[{'id':['5','6','7','8']},{'Tech':['Java']}]");
System.out.println(jsonArray.length());
for(int i=0;i<jsonArray.length();i++){
System.out.println(jsonArray.getJSONObject(i).getString("id"));
}
答案 2 :(得分：-1)
因为在Use Alamofire for image upload -
func makePostRequestForUploadingImage(_ service : String!, imageData : Data?, responseCallBack : APIClientResponseCallBack!) {
let urlString = self.urlStringWithService(service)
Alamofire.upload(multipartFormData: { (multipartFormData) in
if let _ = imageData {
multipartFormData.append(imageData!, withName: "", fileName: "", mimeType: "image/jpg")
}
}, to: urlString) { (encodingresult) in
switch encodingresult {
case .success(let upload, _, _):
upload.responseJSON { response in
responseCallBack? (response.response?.statusCode,response.result.value as AnyObject? , response.result.error as NSError?)
}
case .failure(let encodingError):
print(encodingError)
}
}
}
static func createBodyForMultiPart(input:Any, previousString:String,multipartFormData: MultipartFormData) {
print("previousString -- ", previousString)
if let dic = input as? [String:Any] {
for key in dic.keys {
self.createBodyForMultiPart(input: dic[key]!, previousString: previousString != "" ? (previousString + "[\(key)]") : "\(key)",multipartFormData: multipartFormData)
}
}
else if let array = input as? [Any] {
for i in 0..<array.count{
self.createBodyForMultiPart(input: array[i], previousString: previousString + "[\(i)]",multipartFormData: multipartFormData)
}
}
else if let number = input as? Int {
multipartFormData.append(String(number).data(using:String.Encoding.utf8,allowLossyConversion:false )!, withName: previousString)
}
else if let text = input as? String{
multipartFormData.append(text.data(using:String.Encoding.utf8,allowLossyConversion :false)!, withName: previousString)
}
else if let image = input as? UIImage {
multipartFormData.append(UIImageJPEGRepresentation(image, 0.2)!, withName: previousString, fileName: "inspectionitem.jpeg", mimeType: "image/jpg")
}
else if let floatNumber = input as? Float {
multipartFormData.append(String(floatNumber).data(using:String.Encoding.utf8,allowLossyConversion :false)!, withName: previousString)
}
}
你没有字符串，所以你有一个字符串数组
所以这样做了
id
这样做
jsonObj.getString("id");这会给你那个数组作为回报
就像你在jsonObj.getArray("id");有一个Json数组一样，你必须这样做
id