3.2.6 JsonParser.Java[11]

This class is used for connection with application and php scripts. The application gives parameters and this class converts this to comfortable json format and opens http connection. It also sends information to the server and receives from the server.

Description of the functions and variables of the class JSONParser.java

public JSONObject makeHttpRequest(String url, String method, List<NameValuePair> params) – in JSONParser.java only one method. This method has three parameters: String url is used for getting the address that will send this information, String method is used to know the method of connection Get or Post, List<NameValuePair> params is parameters to send.

Table 7 – variables of class JSONParser.java

Name	Type	description
Is	InputStream	For saving InputStream
jObj	JSONObject	For saving object of JSON
Continue of Table 7 – variables of class JSONParser.java
Json	String	For saving json
method	String	For knowing what kind of method
httpClient	DefaultHttpClient	For saving httpclient
httpPost	HttpPost	For saving httpPost
httpResponse	HttpResponse	For saving HttpResponse
httpClient	DefaultHttpClient	For saving DefaultHttpClient
paramString	String	All parameters
reader	BufferedReader	Reading from stream
Line	String	One line of stream

In Figure - 9 is drawn example class JSONParser.java

public class JSONParser {

static InputStream is = null;

static JSONObject jObj = null;

static String json = "";

public JSONParser() {

}

public JSONObject makeHttpRequest(String url, String method,

List<NameValuePair> params) {

try {

if(method == "POST"){

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpPost httpPost = new HttpPost(url);

httpPost.setEntity(new UrlEncodedFormEntity(params));

HttpResponse httpResponse = httpClient.execute(httpPost);

HttpEntity httpEntity = httpResponse.getEntity();

is = httpEntity.getContent();

}else if(method == "GET"){

DefaultHttpClient httpClient = new DefaultHttpClient();

String paramString = URLEncodedUtils.format(params, "utf-8");

url += "?" + paramString;

HttpGet httpGet = new HttpGet(url);

HttpResponse httpResponse = httpClient.execute(httpGet);

HttpEntity httpEntity = httpResponse.getEntity();

is = httpEntity.getContent();

}

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

try {

BufferedReader reader = new BufferedReader(new InputStreamReader(

is, "iso-8859-1"), 8);

StringBuilder sb = new StringBuilder();

String line = null;

line = reader.readLine();

sb.append(line + "\n");

is.close();

json = sb.toString();

} catch (Exception e) {

Log.e("Buffer Error", "Error converting result " + e.toString());

}

// try parse the string to a JSON object

try {

jObj = new JSONObject(json);

} catch (JSONException e) {

Log.e("JSON Parser", "Error parsing data " + e.toString());

}

// return JSON String

return jObj;

}

}