java - Parsing JSON by using gson -

{     "took": 6200,     "timed_out": false,     "_shards": {         "total": 68,         "successful": 68,         "failed": 0     },     "hits": {         "total": 110745094,         "max_score": 1,         "hits": []     },     "facets": {         "pie": {             "_type": "terms",             "missing": 135,             "total": 29349,             "other": 26420,             "terms": [                 {                     "term": "165.130.136.210",                     "count": 390                 },                 {                     "term": "165.130.136.206",                     "count": 381                 },                 {                     "term": "205.138.114.8",                     "count": 359                 },                 {                     "term": "205.138.115.229",                     "count": 334                 },                 {                     "term": "165.130.136.208",                     "count": 331                 },                 {                     "term": "66.37.212.155",                     "count": 283                 },                 {                     "term": "209.67.71.137",                     "count": 279                 },                 {                     "term": "66.37.204.17",                     "count": 201                 },                 {                     "term": "64.28.92.213",                     "count": 193                 },                 {                     "term": "64.85.64.202",                     "count": 178                 }             ]         }     } } 

i trying parse following, i've tried many api, using json in perl , json.simple, gson in java without luck.

what trying parse out facets=>pie=>terms=>term , count, can give me hint on how extract both values?

here have far

    import java.io.bufferedreader;     import java.io.filenotfoundexception;     import java.io.filereader;     import java.io.ioexception;  import com.google.gson.jsonarray; import com.google.gson.jsonelement; import com.google.gson.jsonobject; import com.google.gson.jsonparser;  public class trueipmonitor {      public static void main(string[] args) {          string json = getjson();         system.out.println(json);         system.out.println(parse(json));      }      public static string parse(string jsonline) {         jsonelement jelement = new jsonparser().parse(jsonline);         jsonobject jobject = jelement.getasjsonobject();         jobject = jobject.getasjsonobject("facets");         jsonarray jarray = jobject.getasjsonarray("pie");         jobject = jarray.get(0).getasjsonobject();         string result = jobject.get("terms").tostring();         return result;     }      public static string getjson() {         bufferedreader br;         string json = "";         try {              br = new bufferedreader(new filereader("script/curljson.log"));             stringbuilder sb = new stringbuilder();             string line = br.readline();              while (line != null) {                 sb.append(line);                 sb.append('\n');                 line = br.readline();             }             json = sb.tostring();              try {                 br.close();             } catch (ioexception e) {                 e.printstacktrace();             }         } catch (filenotfoundexception e) {             e.printstacktrace();         } catch (ioexception e) {             e.printstacktrace();         }          return json;      } }   { "took" : 6200, "timed_out" : false, "_shards" : { "total" : 68, "successful" : 68, "failed" : 0 }, "hits" : { "total" : 110745094, "max_score" : 1.0, "hits" : [ ] }, "facets" : { "pie" : { "_type" : "terms", "missing" : 135, "total" : 29349, "other" : 26420, "terms" : [ { "term" : "165.130.136.210", "count" : 390 }, { "term" : "165.130.136.206", "count" : 381 }, { "term" : "205.138.114.8", "count" : 359 }, { "term" : "205.138.115.229", "count" : 334 }, { "term" : "165.130.136.208", "count" : 331 }, { "term" : "66.37.212.155", "count" : 283 }, { "term" : "209.67.71.137", "count" : 279 }, { "term" : "66.37.204.17", "count" : 201 }, { "term" : "64.28.92.213", "count" : 193 }, { "term" : "64.85.64.202", "count" : 178 } ] } } }  exception in thread "main" java.lang.classcastexception: com.google.gson.jsonobject cannot cast com.google.gson.jsonarray     @ com.google.gson.jsonobject.getasjsonarray(jsonobject.java:172)     @ com.xxx.perf.monitor.trueipmonitor.parse(trueipmonitor.java:36)     @ com.xxx.perf.monitor.trueipmonitor.main(trueipmonitor.java:28) 

your json ok. here perl snippet prints out terms , counts:

...; $json = decode_json $input;  $term (@{ $json->{facets}{pie}{terms} }) {     printf "%15s: %s\n", @$term{qw/term count/}; } 

output:

165.130.136.210: 390 165.130.136.206: 381   205.138.114.8: 359 205.138.115.229: 334 165.130.136.208: 331   66.37.212.155: 283   209.67.71.137: 279    66.37.204.17: 201    64.28.92.213: 193    64.85.64.202: 178 

the problem in java code pie entry not point json array, rather contains json object.

facets : object  `- pie : object      `- terms : array 

your wanted (untested, , debatable style):

public static string parse(string jsonline) {     jsonobject root = new jsonparser().parse(jsonline).getasjsonobject();     jsonarray terms = root.getasjsonobject("facets").getasjsonobject("pie").getasjsonarray("terms")     jsonoject firstterm = terms.get(0).getasjsonobject();     string result = firstterm.get("terms").tostring();     return result; }