What should i use to store multiple images?

What should i use to store multiple images? - java

What should i use to store multiple images that i retrieve from for loop? array or list? Is there any example functions that i can use? Below is my example for loop where i get my data.
JSONObject mainObject = new JSONObject(response.toString());
JSONArray uniObject = mainObject.getJSONArray("result");
for(int i = 0; i < uniObject.length(); i++) {
JSONObject rowObject = uniObject.getJSONObject(i);
co.img1 = ipAddress +"img/store/" + rowObject.getString("store_banner");
}

Use ArrayList<>(); It's away more flexible than the normal array;

Related

Retrieving a Json String using the correct library

I'm trying to get the content of msg which is ERROR. I'm doing that by transforming string return into an array.
Now the solution 1, works perfectly fine using import org.json.JSONArray;:
Vector<ClsReturn> ret = null;
ret = ds.ind(coll,uri );
JSONArray array = new JSONArray(" [{\"type\":1, \"txt\":\"ERROR\"}]");
int i = 0;
JSONObject myJsonObject = new JSONObject();
while(i < array.length()){
myJsonObject = array.getJSONObject(i);
System.out.println(myJsonObject.getString("txt"));
i++;
}
The above solution allows me tro retrieve the content of "txt", which is "ERROR".
However (below code) when I try to use the reutrn of String jsReturn = JSONArray.toJSONString(ret); I'm not capable to do that because the library I'm using doesn't support JSONArray.toJSONString, so I need to import org.json.simple.JSONArray; which in turn doesn't allow me to use array.getJSONObject(i) but both libraries org.json.simple.JSONArray and
org.json.JSONArray don't work together. Any workaround to get the desired outcome?
Vector<ClsReturn> ret = null;
ret = ds.ind(coll,uri );
String jsReturn = JSONArray.toJSONString(ret);//output(using simple.JSONArray) --> [{"type":1, "msg":"ERROR"}]
JSONArray array = new JSONArray(jsReturn);
int i = 0;
JSONObject myJsonObject = new JSONObject();
while(i < array.length()){
myJsonObject = array.getJSONObject(i);
System.out.println(myJsonObject.getString("txt"));
i++;
}

org.json.JSONArray has a toString() method that will output a JSON string. It also allows for indentation by using toString(int indent_factor)

How to store Json Array to Java ArrayList?

I am completely don't know Json. Now i am working in Android project. I know how to use ArrayList. I have Json file inside of my Asset folder in my Android Project.
So, now i need How to parse this file from assets folder and how to store it to ArrayList.

String json="Your Json";
JSONObject resultJson = new JSONObject(json);
JSONArray value = resultJson.getJSONArray(<Pass Your JsonOject Key here>);
ArrayList<String> list = new ArrayList<>();
for (int i = 0; i < value.length(); i++)
{
JSONObject qstnArray = value.getJSONObject(i);
list.add(qstnArray.getString("question"));
}

How to decode in java a json representation of Google appengine Text

I have two appengine applications and am serving a string representation of a JSONObject from one and picking it up in the other. Every thing works well if I don't include a Text object in the JSON
Here is the specific part of the JSON object causing the trouble:
,\"text\":\u003cText: rthBlog 1\r\n\"If you don\u0027t learn from history you are doomed to repeat i...\u003e,
Here is how it looks like in string form:
< Text: rthBlog 1
"If you don't learn from history you are doomed to repeat i...>
Here are the relevant code placing the string in the data store [I am using json.simple]:
Text item_text = new Text("default text"); //it get filled by text longer than 500 char's
JSONObject j = new JSONObject();
j.put("text", item_text);
j.put("item_links", j_links);
item.setProperty("as_json", j.toJSONString());
datastore.put(item);
Here is the code retrieving it wrapping it in a JSONArray the array in a JSONobject and producing a String [I am using appengine json]:
JSONArray search_results = new JSONArray();
for(Entity e: items)
{
String j = (String) e.getProperty("as_json");
JSONObject jo;
if(j != null)
{
System.out.println(TAG + ".searchItems() string as json: " + j);
jo = new JSONObject();
jo.put("item", j);
search_results.add(jo);
}
}
JSONObject jo = new JSONObject();
jo.put("items", search_results);
return jo.toJSONString();
Here is the code picking it up [I am using appengine json]:
try
{
JSONObject jsonObject = new JSONObject(s);
JSONArray jsonArray = (JSONArray) jsonObject.get("items");
JSONObject array_member = null;
JSONObject j;
for(int i=0; i<jsonArray.length(); i++)
{
array_member = jsonArray.getJSONObject(i);
System.out.println("array member" + array_member);
/*Text text = (Text)array_member.get("text"); //
System.out.println(text.getValue());*/
String s_item = array_member.getString("item");
System.out.println("item in string form: " + s_item);
j = new JSONObject(s_item); //This is the exception causing line

You need to be in control of your serialization and deserialization to and from JSON ...
meaning complex object are represented as simple text or numbers.
Here you are trying to serialize a complex object which is not what it is intended for. Make sure you serialize only the value the object is holding not the entire object.
A nice and very powerfull library enabling to fully take control of the serialization/deserialization process is Jackson.

Convert JSON array[array[String]] to Java array

I have a JavaScript JSON array[array[String]] called jsonArray in my JSP1.jsp.
I am converting jsonArray to a String jsonArrayStr using JSON.stringify(jsonArray) in JSP1.jsp.
I am passing jsonArrayStr as a parameter while calling another JSP JSP2.jsp this way-
"JSP2.do?jsonArrayStr="+jsonArrayStr
In JSP2.jsp, I am doing this-
String jsonArrayStr = request.getParameter("jsonArrayStr");
Now how do I convert jsonArrayStr to Java array (JSP2.jsp doesn't contain any JavaScript code)
Summary-
I have a JavaScript JSON Array in a JSP1.jsp, which I want to access as a normal Java array/arraylist in JSP2.jsp. How do I achieve this?

OK, so you have a two-dimensional array of strings represented as a JSON like this stored in a Java String:
[["a", "b", "c"],["x"],["y","z"]]
You need to somehow parse or "deserialize" that value into a Java String[][]. You can use a library like from http://www.json.org/java/index.html or http://jackson.codehaus.org/ or you can try to do it manually. Manually could be a little tricky but not impossible. The json.org library is very simple and might be good enough. The code would be something like this (I haven't tried/tested this):
JSONArray jsonArray = new JSONArray(jsonArrayStr); // JSONArray is from the json.org library
String[][] arrayOfArrays = new String[jsonArray.length()][];
for (int i = 0; i < jsonArray.length(); i++) {
JSONArray innerJsonArray = (JSONArray) jsonArray.get(i);
String[] stringArray = new String[innerJsonArray.length()];
for (int j = 0; j < innerJsonArray.length(); j++) {
stringArray[j] = innerJsonArray.get(j);
}
arrayOfArrays[i] = stringArray;
}

somethingk like this
ArrayList<String> strings= new ArrayList<String>();
JSONArray jsonArray = (JSONArray)jsonObject;
if (jsonArray != null) {
int len = jsonArray.length();
for (int i=0;i<len;i++){
list.add(jsonArray.get(i).toString());
}
}
String[] Stringarray = strings.toArray(new String[strings.size()]);

Server Response (JSON Format) to Array Conversion

I am working on an android app in which i send an http response to a server and get a response in string which is in JSON format, now on the basis of this response i need to generate a stacked column chart using AChartEngine for different equipments. The response string looks like as follows
[{"ChartDate":null,"CycleStatus":null,"Cycle_Duration":0,"Cycle_Percent":0,"Duration":0,"EquipmentDescription":"MTConnect","EquipmentId":5,"EquipmentName":"MTC 1","EquipmentStatusColor":null,"EquipmentStatusDescription":null,"EquipmentStatusId":0,"EquipmentStatusIdentifier":null,"EquipmentStatusTypeId":0,"EquipmentStatusTypeName":null,"EquipmentStatusTypeName_resourceKey":null,"EquipmentTimeZoneId":null,"EventData":null,"GeneralStatusState":0,"IsFirstRowData":false,"Percentage":0,"ReportGroupId":0,"ReportGroupName":null,"ReportGroupValue":null,"StatusAction":0,"StatusDuration":[{"ChartDate":null,"CycleStatus":null,"Cycle_Duration":0,"Cycle_Percent":0,"Duration":561.60722222222023,"EquipmentDescription":"MTConnect","EquipmentId":5,"EquipmentName":"MTC 1","EquipmentStatusColor":"#008000","EquipmentStatusDescription":"In Cycle","EquipmentStatusId":0,"EquipmentStatusIdentifier":null,"EquipmentStatusTypeId":1,"EquipmentStatusTypeName":null,"EquipmentStatusTypeName_resourceKey":"EquipmentStatusTypeName.InCycle","EquipmentTimeZoneId":null,"EventData":null,"GeneralStatusState":0,"IsFirstRowData":false,"Percentage":0,"ReportGroupId":0,"ReportGroupName":null,"ReportGroupValue":null,"StatusAction":0,"StatusDuration":null,"TimeStamp":{"DateTime":"\/Date(-62135596800000)\/","OffsetMinutes":0},"UnknownDowntime_Duration":0,"UnknownDowntime_Percent":0},{"ChartDate":null,"CycleStatus":null,"Cycle_Duration":0,"Cycle_Percent":0,"Duration":134.57583333333525,"EquipmentDescription":"MTConnect","EquipmentId":5,"EquipmentName":"MTC 1","EquipmentStatusColor":"#FFFF00","EquipmentStatusDescription":"In Cycle","EquipmentStatusId":0,"EquipmentStatusIdentifier":"","EquipmentStatusTypeId":2,"EquipmentStatusTypeName":null,"EquipmentStatusTypeName_resourceKey":"EquipmentStatusTypeName.UnknownDowntime","EquipmentTimeZoneId":null,"EventData":null,"GeneralStatusState":0,"IsFirstRowData":false,"Percentage":0,"ReportGroupId":0,"ReportGroupName":null,"ReportGroupValue":null,"StatusAction":0,"StatusDuration":null,"TimeStamp":{"DateTime":"\/Date(-62135596800000)\/","OffsetMinutes":0},"UnknownDowntime_Duration":0,"UnknownDowntime_Percent":0}],"TimeStamp":{"DateTime":"\/Date(-62135596800000)\/","OffsetMinutes":0},"UnknownDowntime_Duration":0,"UnknownDowntime_Percent":0},{"ChartDate":null,"CycleStatus":null,"Cycle_Duration":0,"Cycle_Percent":0,"Duration":0,"EquipmentDescription":null,"EquipmentId":1,"EquipmentName":"PCS Loop 1","EquipmentStatusColor":null,"EquipmentStatusDescription":null,"EquipmentStatusId":0,"EquipmentStatusIdentifier":null,"EquipmentStatusTypeId":0,"EquipmentStatusTypeName":null,"EquipmentStatusTypeName_resourceKey":null,"EquipmentTimeZoneId":null,"EventData":null,"GeneralStatusState":0,"IsFirstRowData":false,"Percentage":0,"ReportGroupId":0,"ReportGroupName":null,"ReportGroupValue":null,"StatusAction":0,"StatusDuration":[{"ChartDate":null,"CycleStatus":null,"Cycle_Duration":0,"Cycle_Percent":0,"Duration":495.61333333332925,"EquipmentDescription":null,"EquipmentId":1,"EquipmentName":"PCS Loop 1","EquipmentStatusColor":"#008000","EquipmentStatusDescription":"In Cycle","EquipmentStatusId":0,"EquipmentStatusIdentifier":null,"EquipmentStatusTypeId":1,"EquipmentStatusTypeName":null,"EquipmentStatusTypeName_resourceKey":"EquipmentStatusTypeName.InCycle","EquipmentTimeZoneId":null,"EventData":null,"GeneralStatusState":0,"IsFirstRowData":false,"Percentage":0,"ReportGroupId":0,"ReportGroupName":null,"ReportGroupValue":null,"StatusAction":0,"StatusDuration":null,"TimeStamp":{"DateTime":"\/Date(-62135596800000)\/","OffsetMinutes":0},"UnknownDowntime_Duration":0,"UnknownDowntime_Percent":0},{"ChartDate":null,"CycleStatus":null,"Cycle_Duration":0,"Cycle_Percent":0,"Duration":200.56972222222623,"EquipmentDescription":null,"EquipmentId":1,"EquipmentName":"PCS Loop 1","EquipmentStatusColor":"#FFFF00","EquipmentStatusDescription":"In Cycle","EquipmentStatusId":0,"EquipmentStatusIdentifier":"","EquipmentStatusTypeId":2,"EquipmentStatusTypeName":null,"EquipmentStatusTypeName_resourceKey":"EquipmentStatusTypeNam
Now this is a response for five different equipments and how can i use this JSON string to an array so that i can extract the data of each equipment and send it to AChartEngine for drawing of chart?

You can convert the response string to JSONObject. The response you posted is JSONArray.
JSONArray jsonArray = new JSONArray(responseString);
int size = jsonArray.length();
ArrayList<JSONObject> arrayList = new ArrayList<JSONObject>();
for(int i= 0; i< size; i++) {
JSONObject jsonObject = jsonArray.optJSONObject(i);
// use this jsonObject to get the value by passing the keys.
String value = jsonObject.optString(key);
//here is your array list of jsonobjects
arrayList.add(jsonObject);
}

Use below Code for Pass JsonArray and store Value into ArrayList.
JSONArray jArray = new JSONArray(mRes);
ArrayList<String> array1 = new ArrayList<String>();
for(int i= 0; i< size; i++) {
JSONObject jObject = jArray.getJSONObject(i);
String mValue = jObject.getString("your_json_object_name");
array1.add(mValue);
}

Use Gson api, it allows you to direct mapping of json objects to java objects. check following links for further reference:
http://code.google.com/p/google-gson/
https://sites.google.com/site/gson/gson-user-guide

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

What should i use to store multiple images? - java

Use ArrayList<>(); It's away more flexible than the normal array;

Related

Retrieving a Json String using the correct library

How to store Json Array to Java ArrayList?

How to decode in java a json representation of Google appengine Text

Convert JSON array[array[String]] to Java array

Server Response (JSON Format) to Array Conversion

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