您好，以下是我的 JSON 文件
{
"completed_in": 0.046,
"max_id": 286437550577573889,
"max_id_str": "286437550577573889",
"next_page": "?page=2&max_id=286437550577573889&q=new%20year",
"page": 1,
"query": "new+year",
"refresh_url": "?since_id=286437550577573889&q=new%20year",
"results": [{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "RodiSilverstone",
"from_user_id": 855001483,
"from_user_id_str": "855001483",
"from_user_name": "Rodi Silverstone",
"geo": null,
"id": 286437550577573889,
"id_str": "286437550577573889",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/2978713010\/5e321e174ded0c14f11d4929c1928912_normal.png",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/2978713010\/5e321e174ded0c14f11d4929c1928912_normal.png",
"source": "<a href="http:\/\/twitter.com\/">web<\/a>",
"text": "Bonne annee\/joyeux Noel en retard :S\nHappy New Year\/Merry Christmas w\/ late...\nPS: Pas d'accents car clav' Qwerty car I'm in Australia ^^",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "ToddBuell",
"from_user_id": 461294085,
"from_user_id_str": "461294085",
"from_user_name": "Todd Buell",
"geo": null,
"id": 286437550334291970,
"id_str": "286437550334291970",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/2482121747\/bqf3z7knjm3zetmdkc7g_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/2482121747\/bqf3z7knjm3zetmdkc7g_normal.jpeg",
"source": "<a href="http:\/\/twitter.com\/">web<\/a>",
"text": "Fiscal cliff deal gives markets relief in New Year. \"Super Mario\" has averted euro zone crisis.Things look good for now, but will it last?",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "Laughing_Gravy",
"from_user_id": 16528102,
"from_user_id_str": "16528102",
"from_user_name": "Laughing Gravy\u2122",
"geo": null,
"id": 286437550313312256,
"id_str": "286437550313312256",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/3027789460\/1bda0b2d9779e552e5d5f5dc7b46d7c1_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/3027789460\/1bda0b2d9779e552e5d5f5dc7b46d7c1_normal.jpeg",
"source": "<a href="http:\/\/blackberry.com\/twitter">Twitter for BlackBerry\u00ae<\/a>",
"text": "@Lindow_Man Happy New Year my friend :)",
"to_user": "Lindow_Man",
"to_user_id": 549313793,
"to_user_id_str": "549313793",
"to_user_name": "Mr PG",
"in_reply_to_status_id": 286436483806670848,
"in_reply_to_status_id_str": "286436483806670848"
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "ayinnisa",
"from_user_id": 407600441,
"from_user_id_str": "407600441",
"from_user_name": "Arini Faranisa",
"geo": null,
"id": 286437550271381504,
"id_str": "286437550271381504",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/2527223229\/picmix-2172012-144555_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/2527223229\/picmix-2172012-144555_normal.jpeg",
"source": "<a href="http:\/\/ubersocial.com">UberSocial for BlackBerry<\/a>",
"text": "Happy nu year too my bicih :* RT @ThataMarsya: Happy new year couzy @tyaaaacw @ayinnisa @ayuayu2x @glori4valentine (\u02d8\u2323\u02d8)\u03b5\u02d8)",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "dougshepherd1",
"from_user_id": 325897505,
"from_user_id_str": "325897505",
"from_user_name": "Doug Shepherd",
"geo": null,
"id": 286437550229434368,
"id_str": "286437550229434368",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/1420764658\/dougandro_normal.jpg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/1420764658\/dougandro_normal.jpg",
"source": "<a href="http:\/\/twitterfeed.com">twitterfeed<\/a>",
"text": "Title Boxing Club 'Sweat Factory' Open For New Year's Resolution Help: When Ken Greer accidentally clicked a but... http:\/\/t.co\/RZ0Eim48",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "a1a2a2a3a4",
"from_user_id": 935634619,
"from_user_id_str": "935634619",
"from_user_name": "\uc720\uc2b9\uc6b0\uc870\uc73c\ub2e4Vv",
"geo": null,
"id": 286437550145556480,
"id_str": "286437550145556480",
"iso_language_code": "ko",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/2898657882\/6a71600348f1d4136866a86e267722d5_normal.png",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/2898657882\/6a71600348f1d4136866a86e267722d5_normal.png",
"source": "<a href="http:\/\/twitter.com\/download\/android">Twitter for Android<\/a>",
"text": "RT @seungu97: @PutriNorizah \ubbf8\uc548\ud574\uc694\ud478\ud2b8\ub9aci was in a hurry to write you back happy new year \ud478\ud2b8\ub9ac\ub108\ubb34\ucc29\ud574\uc694\uce74\ud1a1\ud574\uc694",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "RaymondMarvinP",
"from_user_id": 153311501,
"from_user_id_str": "153311501",
"from_user_name": "Raymond Pattipeilohy",
"geo": null,
"id": 286437550116184064,
"id_str": "286437550116184064",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/3054427884\/86a9053b8bb8530cb31a730d6895abc3_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/3054427884\/86a9053b8bb8530cb31a730d6895abc3_normal.jpeg",
"source": "<a href="https:\/\/embr.in">embr<\/a>",
"text": "Happy new year adk :D @khunkromo",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "Nellyestao",
"from_user_id": 401253041,
"from_user_id_str": "401253041",
"from_user_name": "Nelly Estaorina",
"geo": null,
"id": 286437549428318209,
"id_str": "286437549428318209",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/3012999534\/2e73bf044ef0282ab1829d9308609f8b_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/3012999534\/2e73bf044ef0282ab1829d9308609f8b_normal.jpeg",
"source": "<a href="http:\/\/blackberry.com\/twitter">Twitter for BlackBerry\u00ae<\/a>",
"text": "RT @mutiaraulia: Happy New Year 2013 for UJP14\u263a\u2661 . Make it better! Better than 2012! Success for our training! And keep never remedial alone",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "katiee_douglas",
"from_user_id": 231021947,
"from_user_id_str": "231021947",
"from_user_name": "Katie Douglas X",
"geo": null,
"id": 286437549407346688,
"id_str": "286437549407346688",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/3049930519\/be6f7dd5d68c199df4c5befa121260d2_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/3049930519\/be6f7dd5d68c199df4c5befa121260d2_normal.jpeg",
"source": "<a href="http:\/\/twitter.com\/download\/iphone">Twitter for iPhone<\/a>",
"text": "RT @CalvinTrever: Didn't sleep on new year, only slept last night so now I feel like f***ing s**t",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "hico2",
"from_user_id": 205687874,
"from_user_id_str": "205687874",
"from_user_name": "hico\u00b2",
"geo": null,
"id": 286437549273124864,
"id_str": "286437549273124864",
"iso_language_code": "ja",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/1341047299\/DSC_4069_normal.JPG",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/1341047299\/DSC_4069_normal.JPG",
"source": "<a href="http:\/\/twitter.com\/">web<\/a>",
"text": "hico\u00b2\u30d6\u30ed\u30b0\u66f4\u65b0\u3057\u3083\u3063\u3059\uff01\u300eA HAPPY NEW YEAR\uff01\u301c\u7b11\u9580\u6765\u798f2013\u301c\uff01\uff01\u300f\nhttp:\/\/t.co\/Wk2lSVZJ",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "saionjikyua",
"from_user_id": 154139162,
"from_user_id_str": "154139162",
"from_user_name": "\u304d\u3085\u3042K\u3000",
"geo": null,
"id": 286437549222817793,
"id_str": "286437549222817793",
"iso_language_code": "ja",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/3011151755\/914f0441f5cca86a822248ba84b125f0_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/3011151755\/914f0441f5cca86a822248ba84b125f0_normal.jpeg",
"source": "<a href="https:\/\/mobile.twitter.com">Mobile Web (M2)<\/a>",
"text": "kyua HAPPY NEW YEAR!\"!!!!!\n\n\u897f\u5712\u5bfa\u308e\u305f\u3060\u3044\u307e\u65e5\u672c\u306b\u5e30\u5b85\u3057\u305f\u30ad\u30e5\u30a2\u2605",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:28 +0000",
"from_user": "_GiuliaB_",
"from_user_id": 161635884,
"from_user_id_str": "161635884",
"from_user_name": "Giulia Anna \u2665",
"geo": null,
"id": 286437548652376064,
"id_str": "286437548652376064",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/2396882564\/9ufvgyxf6hacuxl2znf7_normal.png",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/2396882564\/9ufvgyxf6hacuxl2znf7_normal.png",
"source": "<a href="http:\/\/www.hootsuite.com">HootSuite<\/a>",
"text": "New Year's #resolutions http:\/\/t.co\/UGdMHPjf",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:27 +0000",
"from_user": "WashingtonTroom",
"from_user_id": 148635962,
"from_user_id_str": "148635962",
"from_user_name": "Washington Tea Room",
"geo": null,
"id": 286437548501377024,
"id_str": "286437548501377024",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/2211531785\/washington_tea_room_sign_1_normal.jpg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/2211531785\/washington_tea_room_sign_1_normal.jpg",
"source": "<a href="http:\/\/itunes.apple.com\/us\/app\/twitter\/id409789998?mt=12">Twitter for Mac<\/a>",
"text": "Looking for a new year challenge? Why not volunteer to help for just a few hours each month for a local community project, very rewarding!",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:27 +0000",
"from_user": "RosalynOlson11",
"from_user_id": 1054839787,
"from_user_id_str": "1054839787",
"from_user_name": "Rosalyn Olson",
"geo": null,
"id": 286437548396527616,
"id_str": "286437548396527616",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/3054422061\/cbb2cb2f2af48d452945aca59a66b073_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/3054422061\/cbb2cb2f2af48d452945aca59a66b073_normal.jpeg",
"source": "<a href="https:\/\/mobile.twitter.com">Mobile Web (M2)<\/a>",
"text": "#job Anyone actually make this happen? http:\/\/t.co\/RkHSUrOk",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
},
{
"created_at": "Wed, 02 Jan 2013 11:43:27 +0000",
"from_user": "BumperArmor",
"from_user_id": 1021423430,
"from_user_id_str": "1021423430",
"from_user_name": "Bumper Armor",
"geo": null,
"id": 286437548350377984,
"id_str": "286437548350377984",
"iso_language_code": "en",
"metadata": {
"result_type": "recent"
},
"profile_image_url": "http:\/\/a0.twimg.com\/profile_images\/2993704676\/0647b39064b4ed7147be4a061e910bc3_normal.jpeg",
"profile_image_url_https": "https:\/\/si0.twimg.com\/profile_images\/2993704676\/0647b39064b4ed7147be4a061e910bc3_normal.jpeg",
"source": "<a href="http:\/\/twitter.com\/">web<\/a>",
"text": "How was the New Year Celebration??",
"to_user": null,
"to_user_id": 0,
"to_user_id_str": "0",
"to_user_name": null
}],
"results_per_page": 15,
"since_id": 0,
"since_id_str": "0"
}
我正在使用以下java程序来解析json文件
package jsonparser;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map.Entry;
public class BasicGenGson {
final private String path = "C:/json/"; //set directory path
private JsonParser parser = new JsonParser();
private int count = -1;
public static void main(String[] args) {
BasicGenGson read = new BasicGenGson();
read.sendJSONFile();
}
//send json files to read one by one
private void sendJSONFile() {
File[] jsonfiles = getJSONFiles();
if (jsonfiles.length > 0) {
for (int i = 0; i <= count; i++) {
try {
//prints json file names
System.out.println("File: \t" + jsonfiles[i]);
JsonElement jsonElement = parser.parse(new FileReader(jsonfiles[i]));
JsonObject jsonObject = jsonElement.getAsJsonObject();
readJSONFile(jsonObject);
}
catch (FileNotFoundException e) {
System.out.println(e.getMessage());
//e.getStackTrace();
}
catch (IOException e) {
System.out.println(e.getMessage());
//e.getStackTrace();
}
catch (Exception e) {
System.out.println(e.getMessage());
//e.getStackTrace();
}
}
}
}
//read a complete json file
private void readJSONFile(JsonObject jsonObject) {
for (Entry<String, JsonElement> entry : jsonObject.entrySet()) {
String key = entry.getKey();
JsonElement value = entry.getValue();
if (value.isJsonObject()) {
readJSONFile(value.getAsJsonObject());
}
else if (value.isJsonArray()) {
JsonArray jsonArray = value.getAsJsonArray();
if (jsonArray.size() == 1) {
readJSONFile((JsonObject) jsonArray.get(0));
}
else {
//prints json array name
System.out.println(key);
Iterator<JsonElement> msg = jsonArray.iterator();
while (msg.hasNext()) {
////prints json array values
//System.out.println(msg.next());
/*******************************************/
if (msg.next().isJsonObject()) {
readJSONFile(msg.next().getAsJsonObject());
}
/***********************************************/
}
}
}
else {
////prints json object's keys and values
if (key.equals("from_user")|| key.equals("text") ) {
System.out.println(key + " - " + value);
}
// System.out.println(key + " - " + value);
}
}
}
//get only .json files from a directory
private File[] getJSONFiles() {
File folder = new File(path);
File[] files = folder.listFiles();
File[] jsonfiles = new File[files.length];
for (int i = 0; i < files.length; i++) {
if (files[i].isFile()) {
if (files[i].getName().endsWith(".json") || files[i].getName().endsWith(".JSON")) {
jsonfiles[++count] = files[i];
}
}
}
return files;
}
}
我需要提取“from_user”和“text”，但我没有获取所有字段......在几个值之后，它的打印为空。以下是输出
File: C:\json\NewYear.json
results
from_user - "ToddBuell"
text - "Fiscal cliff deal gives markets relief in New Year. \"Super Mario\" has averted euro zone crisis.Things look good for now, but will it last?"
from_user - "ayinnisa"
text - "Happy nu year too my bicih :* RT @ThataMarsya: Happy new year couzy @tyaaaacw @ayinnisa @ayuayu2x @glori4valentine (???)??)"
from_user - "a1a2a2a3a4"
text - "RT @seungu97: @PutriNorizah ???????i was in a hurry to write you back happy new year ????????????"
from_user - "Nellyestao"
text - "RT @mutiaraulia: Happy New Year 2013 for UJP14?? . Make it better! Better than 2012! Success for our training! And keep never remedial alone"
from_user - "hico2"
text - "hico²???????????A HAPPY NEW YEAR??????2013????\nhttp://t.co/Wk2lSVZJ"
from_user - "_GiuliaB_"
text - "New Year's #resolutions http://t.co/UGdMHPjf"
from_user - "RosalynOlson11"
text - "#job Anyone actually make this happen? http://t.co/RkHSUrOk"
null
请帮忙...谢谢
最佳答案
出于同样的原因，您只打印 JSON 数组中的所有其他条目。
if (msg.next().isJsonObject()) {
readJSONFile(msg.next().getAsJsonObject());
}
您正在调用 Iterator 的 next() 方法两次。第一次调用它时，您将丢弃返回的对象。最后，第二次调用它时，它会返回 null，因为数组中没有可供返回的对象。
关于java - java中的GSON解析器打印null，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14158399/