我有一个 java 程序，它检索特定电视节目的数据并返回带有详细信息的 JSON 响应。我的问题是解析 JSON 响应以获取一个特定的键值对，即“first_aired_iso”字符串，它给出了该剧集的播出日期。
这是调用 API 的 URL
String api_url = "http://api.trakt.tv/show/season.json/<api-key>/the-walking-dead/1";
这是相应的 JSON 响应
！
[ { "season":1, "episode":1, "number":1, "tvdb_id":2493011, "title":"Days Gone Bye", "overview":"Rick searches for his family after emerging from a coma into a world terrorized by the walking dead. Morgan and Duane, whom he meets along the way, help teach Rick the new rules for survival.", "first_aired":1288584000, "first_aired_iso":"2010-10-31T21:00:00-05:00", "first_aired_utc":1288598400, "url":"http://trakt.tv/show/the-walking-dead/season/1/episode/1", "screen":"http://slurm.trakt.us/images/episodes/124-1-1.22.jpg", "images":{ "screen":"http://slurm.trakt.us/images/episodes/124-1-1.22.jpg" }, "ratings":{ "percentage":89, "votes":763, "loved":733, "hated":30 }, "watched":true, "in_collection":true, "in_watchlist":false, "rating":false, "rating_advanced":0 }, { "season":1, "episode":2, "number":2, "tvdb_id":2493181, "title":"Guts", "overview":"Rick unknowingly causes a group of survivors to be trapped by walkers. The group dynamic devolves from accusations to violence, as Rick must confront an enemy far more dangerous than the undead.", "first_aired":1289192400, "first_aired_iso":"2010-11-07T21:00:00-06:00", "first_aired_utc":1289210400, "url":"http://trakt.tv/show/the-walking-dead/season/1/episode/2", "screen":"http://slurm.trakt.us/images/episodes/124-1-2.22.jpg", "images":{ "screen":"http://slurm.trakt.us/images/episodes/124-1-2.22.jpg" }, "ratings":{ "percentage":87, "votes":533, "loved":507, "hated":26 }, "watched":true, "in_collection":true, "in_watchlist":false, "rating":false, "rating_advanced":0 }, { "season":1, "episode":3, "number":3, "tvdb_id":2656081, "title":"Tell It to the Frogs", "overview":"After returning to the camp with the department store survivors and an emotional reunion with his wife and son, Rick decides to go against Shane's advice and go back to Atlanta for Merle Dixon and his dropped bag of guns accompanied by Merle's younger brother, Darryl Dixon, as well as Glenn and T-Dog.", "first_aired":1289797200, "first_aired_iso":"2010-11-14T21:00:00-06:00", "first_aired_utc":1289815200, "url":"http://trakt.tv/show/the-walking-dead/season/1/episode/3", "screen":"http://slurm.trakt.us/images/episodes/124-1-3.22.jpg", "images":{ "screen":"http://slurm.trakt.us/images/episodes/124-1-3.22.jpg" }, "ratings":{ "percentage":85, "votes":484, "loved":458, "hated":26 }, "watched":true, "in_collection":true, "in_watchlist":false, "rating":false, "rating_advanced":0 }, { "season":1, "episode":4, "number":4, "tvdb_id":2656091, "title":"Vatos", "overview":"While still in search of Merle, the group tries to retrieve the bag of guns but are attacked by several living men who are also after the weapons. The group manages to grab the injured attacker; however, several of the attackers escape and take Glenn hostage. Back at camp a large group of walkers venture up the hill and take the survivors by surprise.", "first_aired":1290402000, "first_aired_iso":"2010-11-21T21:00:00-06:00", "first_aired_utc":1290420000, "url":"http://trakt.tv/show/the-walking-dead/season/1/episode/4", "screen":"http://slurm.trakt.us/images/episodes/124-1-4.22.jpg", "images":{ "screen":"http://slurm.trakt.us/images/episodes/124-1-4.22.jpg" }, "ratings":{ "percentage":88, "votes":490, "loved":467, "hated":23 }, "watched":true, "in_collection":true, "in_watchlist":false, "rating":false, "rating_advanced":0 }, { "season":1, "episode":5, "number":5, "tvdb_id":2656101, "title":"Wildfire", "overview":"Rick leads the group to the CDC after the attack on the camp. Jim must make a terrible life and death decision.", "first_aired":1291006800, "first_aired_iso":"2010-11-28T21:00:00-06:00", "first_aired_utc":1291024800, "url":"http://trakt.tv/show/the-walking-dead/season/1/episode/5", "screen":"http://slurm.trakt.us/images/episodes/124-1-5.22.jpg", "images":{ "screen":"http://slurm.trakt.us/images/episodes/124-1-5.22.jpg" }, "ratings":{ "percentage":87, "votes":460, "loved":443, "hated":17 }, "watched":true, "in_collection":true, "in_watchlist":false, "rating":"love", "rating_advanced":10 }, { "season":1, "episode":6, "number":6, "tvdb_id":2656111, "title":"TS-19", "overview":"Rick and the group are allowed into the CDC by a strange doctor, but all is not what it seems in their newfound haven. ", "first_aired":1291611600, "first_aired_iso":"2010-12-05T21:00:00-06:00", "first_aired_utc":1291629600, "url":"http://trakt.tv/show/the-walking-dead/season/1/episode/6", "screen":"http://slurm.trakt.us/images/episodes/124-1-6.22.jpg", "images":{ "screen":"http://slurm.trakt.us/images/episodes/124-1-6.22.jpg" }, "ratings":{ "percentage":87, "votes":465, "loved":440, "hated":25 }, "watched":true, "in_collection":true, "in_watchlist":false, "rating":"love", "rating_advanced":10 } ]
好吧，你明白了……我只需要为每一集提取“first_aired_iso”的键值。
这是我的代码
String s = response.toString();
Gson gson = new Gson();
String jsonstr = gson.toJson(s);
System.out.println(jsonstr);
JsonArray json = JsonArray.readFrom(jsonstr);
for (int i = 0; i < 15; i++) {
System.out.println(json.get(i).asString());
}
问题是，打印原始 JSON 输出后绝对没有响应。我根本无法让它进入循环。
如需参考，请查看http://eclipsesource.com/blogs/2013/04/18/minimal-json-parser-for-java/