java - REST api and json parsing -

i'm writing code in java rest , output i'm getting in json format. want parse json string simple string in java i'm getting errors. below code:

package restapp; import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstreamreader; import java.io.stringreader; import java.net.httpurlconnection; import java.net.malformedurlexception; import java.net.url;  import java.util.*; import java.io.filenotfoundexception; import java.io.filereader; import java.io.ioexception; import org.json.jsonarray; import org.json.jsonexception;  import java.util.iterator; import org.json.jsonobject; import org.json.simple.parser.jsonparser; import org.json.simple.parser.parseexception;      public class testapp {      public static void main(string[] args) throws jsonexception, parseexception {         string output = "abc";         try {              url url = new url("http://ip/sss-wsrcrest-controller-5.2.3.1/wsrcservice/wsrc/v1/processget?subsystemid=external&subsystempassword=password&operation=listsubscriptions&msisdn=1111");             httpurlconnection conn = (httpurlconnection) url.openconnection();             conn.setrequestmethod("get");             conn.setrequestproperty("accept", "application/json");              if (conn.getresponsecode() != 200) {                  throw new runtimeexception("failed : http error code : "                         + conn.getresponsecode());             }              bufferedreader br = new bufferedreader(new inputstreamreader(             (conn.getinputstream())));              //string output;             system.out.println("output server .... \n");             while ((output = br.readline()) != null) {                 system.out.println(output);             }              conn.disconnect();          } catch (malformedurlexception e) {             e.printstacktrace();          } catch (ioexception e) {             e.printstacktrace();         }          jsonparser parser = new jsonparser();         //system.out.println(str);         org.json.simple.jsonobject jsonobject = (org.json.simple.jsonobject) parser.parse(str);           try {               org.json.simple.jsonarray msg = (org.json.simple.jsonarray) jsonobject.get("keyparamarray");             int n = (msg).length();             (int = 0; < n; ++i) {                 jsonobject person = (msg).getjsonobject(i);                 system.out.println(person.getint("key"));             }           }           catch (exception e) {             e.printstacktrace();         }        }   }          

the output

{     "errorcode": "0",     "errormessage": "processed successfully",     "keyparamarray": {         "keyparam": [             {                 "key": "msisdn",                 "value": "123"             },             {                 "key": "subscriberid",                 "value": "123"             },             {                 "key": "customnumfield9",                 "value": "0"             },             {                 "key": "customnumfield10",                 "value": "0"             },             {                 "key": "customnumfield6",                 "value": "0"             },             {                 "key": "customnumfield5",                 "value": "0"             },             {                 "key": "customnumfield8",                 "value": "0"             },             {                 "key": "customnumfield7",                 "value": "0"             },             {                 "key": "customnumfield2",                 "value": "0"             },             {                 "key": "customnumfield1",                 "value": "0"             },             {                 "key": "customnumfield4",                 "value": "0"             },             {                 "key": "customnumfield3",                 "value": "0"             },             {                 "key": "parentsubscriberid",                 "value": "0"             },             {                 "key": "active",                 "value": "1"             },             {                 "key": "barringstatus",                 "value": "1"             }         ]     } } 

so want output

msisdn 123  subscriberid 123 

... , on

org.json.simple.jsonobject jsonobject = (org.json.simple.jsonobject) parser.parse(str);  

in above line of code, have passed str parser.parse(str) it's defined in class .