Java使用gson解析复杂的json响应
[英]Java using gson to parse a complex json response
问题描述
I need to extract values from this complex json response using gson: 
我需要使用gson从这个复杂的json响应中提取值：
{
"result": {
"status": 1,
"num_backpack_slots": 500,
"items": [
{
"id": 455391,
"original_id": 455391,
"defindex": 125,
"level": 1,
"quality": 6,
"inventory": 2147483742,
"quantity": 1,
"origin": 0,
"flag_cannot_trade": true
},
{
"id": 513820071,
"original_id": 513820071,
"defindex": 471,
"level": 50,
"quality": 6,
"inventory": 2147483741,
"quantity": 1,
"origin": 13,
"flag_cannot_trade": true
},
{
"id": 576746588,
"original_id": 570246654,
"defindex": 39,
"level": 10,
"quality": 11,
"inventory": 2147483720,
"quantity": 1,
"origin": 8,
"equipped": [
{
"class": 7,
"slot": 1
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 1000,
"float_value": 0.000000
}
]
},
{
"id": 576775968,
"original_id": 418597987,
"defindex": 40,
"level": 10,
"quality": 11,
"inventory": 2147483719,
"quantity": 1,
"origin": 3,
"equipped": [
{
"class": 7,
"slot": 0
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 4394,
"float_value": 0.000000
}
]
},
{
"id": 607610629,
"original_id": 470196433,
"defindex": 141,
"level": 5,
"quality": 11,
"inventory": 2147483710,
"quantity": 1,
"origin": 8,
"equipped": [
{
"class": 9,
"slot": 0
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 352,
"float_value": 0.000000
}
]
},
{
"id": 658784889,
"original_id": 367005538,
"defindex": 61,
"level": 5,
"quality": 11,
"inventory": 2147483712,
"quantity": 1,
"origin": 3,
"equipped": [
{
"class": 8,
"slot": 1
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 214,
"float_value": 0.000000
}
]
},
{
"id": 697046877,
"original_id": 697046877,
"defindex": 242,
"level": 1,
"quality": 6,
"inventory": 2147483739,
"quantity": 1,
"origin": 9,
"flag_cannot_trade": true,
"attributes": [
{
"defindex": 185,
"value": 1328492055,
"float_value": 2939033344.000000
}
]
},
{
"id": 697206938,
"original_id": 697206938,
"defindex": 581,
"level": 31,
"quality": 6,
"inventory": 2147483740,
"quantity": 1,
"origin": 1,
"flag_cannot_trade": true
},
{
"id": 708417260,
"original_id": 688333621,
"defindex": 37,
"level": 10,
"quality": 11,
"inventory": 2147483711,
"quantity": 1,
"origin": 8,
"equipped": [
{
"class": 5,
"slot": 2
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 131,
"float_value": 0.000000
}
]
},
{
"id": 708425760,
"original_id": 597434022,
"defindex": 58,
"level": 5,
"quality": 11,
"inventory": 2147483731,
"quantity": 1,
"origin": 8,
"equipped": [
{
"class": 2,
"slot": 1
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 540,
"float_value": 0.000000
}
]
},
{
"id": 735058153,
"original_id": 702208573,
"defindex": 701,
"level": 84,
"quality": 6,
"inventory": 2147483746,
"quantity": 1,
"origin": 4,
"attributes": [
{
"defindex": 228,
"value": 44044472,
"float_value": 0.000000,
"account_info": {
"steamid": 76561198004310200,
"personaname": "Bukz | TF2calc.tk"
}
}
]
},
{
"id": 783535692,
"original_id": 746181220,
"defindex": 239,
"level": 10,
"quality": 11,
"inventory": 2147483732,
"quantity": 1,
"origin": 8,
"equipped": [
{
"class": 6,
"slot": 2
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 2,
"float_value": 0.000000
}
]
},
{
"id": 790390696,
"original_id": 705188110,
"defindex": 56,
"level": 10,
"quality": 6,
"inventory": 2147483840,
"quantity": 1,
"origin": 0
},
{
"id": 823322632,
"original_id": 663311596,
"defindex": 167,
"level": 5,
"quality": 6,
"inventory": 2147483748,
"quantity": 1,
"origin": 0,
"equipped": [
{
"class": 3,
"slot": 9
},
{
"class": 4,
"slot": 9
},
{
"class": 1,
"slot": 9
},
{
"class": 2,
"slot": 9
},
{
"class": 7,
"slot": 9
},
{
"class": 5,
"slot": 9
},
{
"class": 6,
"slot": 9
},
{
"class": 8,
"slot": 9
},
{
"class": 9,
"slot": 9
}
]
},
{
"id": 831931223,
"original_id": 794619497,
"defindex": 140,
"level": 5,
"quality": 6,
"inventory": 2147483831,
"quantity": 1,
"origin": 0,
"equipped": [
{
"class": 9,
"slot": 1
}
]
},
{
"id": 838987757,
"original_id": 151360199,
"defindex": 264,
"level": 5,
"quality": 6,
"inventory": 2147483800,
"quantity": 1,
"origin": 3,
"equipped": [
{
"class": 7,
"slot": 2
},
{
"class": 3,
"slot": 2
},
{
"class": 2,
"slot": 2
},
{
"class": 1,
"slot": 2
}
]
},
{
"id": 839449369,
"original_id": 763635464,
"defindex": 477,
"level": 5,
"quality": 6,
"inventory": 2147483747,
"quantity": 1,
"origin": 0
},
{
"id": 839531073,
"original_id": 482419131,
"defindex": 211,
"level": 1,
"quality": 11,
"inventory": 2147483709,
"quantity": 1,
"origin": 3,
"equipped": [
{
"class": 5,
"slot": 1
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 116,
"float_value": 0.000000
},
{
"defindex": 294,
"value": 325,
"float_value": 0.000000
}
]
},
{
"id": 843856946,
"original_id": 93370304,
"defindex": 143,
"level": 42,
"quality": 6,
"inventory": 2147483700,
"quantity": 1,
"origin": 3
},
{
"id": 973205893,
"original_id": 864931488,
"defindex": 522,
"level": 10,
"quality": 6,
"inventory": 2147483726,
"quantity": 1,
"origin": 0,
"equipped": [
{
"class": 3,
"slot": 10
},
{
"class": 2,
"slot": 10
},
{
"class": 1,
"slot": 10
},
{
"class": 6,
"slot": 10
},
{
"class": 5,
"slot": 10
},
{
"class": 7,
"slot": 10
}
]
},
{
"id": 975592060,
"original_id": 975592060,
"defindex": 744,
"level": 69,
"quality": 6,
"inventory": 2147483743,
"quantity": 1,
"origin": 1,
"flag_cannot_trade": true
},
{
"id": 986693653,
"original_id": 643535744,
"defindex": 474,
"level": 25,
"quality": 6,
"inventory": 2147483799,
"quantity": 1,
"origin": 0,
"attributes": [
{
"defindex": 152,
"value": 4142075573,
"float_value": -2302636095545453300000000000000000.000000
},
{
"defindex": 227,
"value": 146855095,
"float_value": 0.000000
}
]
},
{
"id": 986693656,
"original_id": 699128493,
"defindex": 197,
"level": 1,
"quality": 11,
"inventory": 2147483722,
"quantity": 1,
"origin": 8,
"custom_name": "MAXIMUM NOOB HEAT",
"equipped": [
{
"class": 9,
"slot": 2
}
]
,
"attributes": [
{
"defindex": 189,
"value": 1093664768,
"float_value": 11.000000
},
{
"defindex": 214,
"value": 218,
"float_value": 0.000000
},
{
"defindex": 294,
"value": 18,
"float_value": 0.000000
}
]
},
{
"id": 988633074,
"original_id": 253598540,
"defindex": 118,
"level": 21,
"quality": 3,
"inventory": 2147483738,
"quantity": 1,
"origin": 3
},
{
"id": 1025190520,
"original_id": 346911280,
"defindex": 483,
"level": 15,
"quality": 6,
"inventory": 2147483717,
"quantity": 1,
"origin": 3,
"equipped": [
{
"class": 8,
"slot": 10
}
]
,
"attributes": [
{
"defindex": 142,
"value": 1266641332,
"float_value": 16738740.000000
},
{
"defindex": 261,
"value": 1266641332,
"float_value": 16738740.000000
}
]
},
{
"id": 1025190651,
"original_id": 677752195,
"defindex": 142,
"level": 15,
"quality": 6,
"inventory": 2147483830,
"quantity": 1,
"origin": 0
},
{
"id": 1025191043,
"original_id": 244038290,
"defindex": 237,
"level": 1,
"quality": 6,
"inventory": 2147483801,
"quantity": 1,
"origin": 3
},
{
"id": 1025191147,
"original_id": 522190433,
"defindex": 265,
"level": 1,
"quality": 6,
"inventory": 2147483802,
"quantity": 1,
"origin": 4
},
{
"id": 1228670494,
"original_id": 1228670494,
"defindex": 311,
"level": 1,
"quality": 6,
"inventory": 2147483835,
"quantity": 1,
"origin": 0
},
{
"id": 1228702072,
"original_id": 1228702072,
"defindex": 5022,
"level": 10,
"quality": 6,
"inventory": 2147483690,
"quantity": 1,
"origin": 0,
"attributes": [
{
"defindex": 187,
"value": 1111228416,
"float_value": 47.000000
}
]
},
{
"id": 1228702073,
"original_id": 1228702073,
"defindex": 5627,
"level": 10,
"quality": 6,
"inventory": 2147483689,
"quantity": 1,
"origin": 0,
"attributes": [
{
"defindex": 187,
"value": 1112276992,
"float_value": 51.000000
}
]
},
{
"id": 1228758422,
"original_id": 1228758422,
"defindex": 648,
"level": 15,
"quality": 6,
"inventory": 2147483825,
"quantity": 1,
"origin": 0
},
{
"id": 1228758423,
"original_id": 1228758423,
"defindex": 5611,
"level": 1,
"quality": 6,
"inventory": 2147483688,
"quantity": 1,
"origin": 0
},
{
"id": 1228897312,
"original_id": 1228897312,
"defindex": 173,
"level": 5,
"quality": 6,
"inventory": 2147483815,
"quantity": 1,
"origin": 0
},
{
"id": 1228897313,
"original_id": 1228897313,
"defindex": 5615,
"level": 1,
"quality": 6,
"inventory": 2147483687,
"quantity": 1,
"origin": 0
}
]
}
}
I've done some searching here on stackoverflow and on google, but I was unable to find any easily understandable examples that show how to traverse complex json objects such as this in java. 我在这里做了一些关于stackoverflow和google的搜索，但是我找不到任何易于理解的示例来说明如何遍历复杂的json对象，例如在Java中。 As you can see, the amount of nesting that may appear in the response is a bit overwhelming. 如您所见，响应中可能出现的嵌套数量有点不堪重负。 I know that I have to create a class (or even classes?) to hold the data, and use fromJson() to populate it, but I am unsure of exactly how it should be set up, as well as how to handle the large "items" array. 我知道我必须创建一个类（甚至是类？）来保存数据，并使用fromJson（）来填充数据，但是我不确定应该如何设置以及如何处理大型数据。 “项目”数组。 Any hints/tips/examples would be much appreciated, thanks. 任何提示/技巧/示例将不胜感激，谢谢。 :) :)
PS I'm new to stackoverflow and fairly new to Java, please go easy on me. PS我是stackoverflow的新手，而Java的新手，请放轻松。
1 个解决方案
解决方案1
1 已采纳 2012-12-02 05:55:13
first all create class that represents your JSON String. 首先创建class ，代表您的JSON字符串。
After, using GSON library convert your String to class Object. 之后，使用GSON库将您的String转换为Object class 。 Here is example: 这是示例：
your main class lets call MyRoot . 您的主类可以调用MyRoot 。 In MyRoot you have 1 filed named result so we build Result class. 在MyRoot您有1个命名为result MyRoot ，因此我们构建Result类。
public class MyRoot{ // <- you can give your class name,
private Result result = 0; // Its importent to provide the same field name
}
The items should be an ArrayList of Objects (lets call them Item ) 这些items应该是ArrayList of Objects（我们称它们为Item ）
public class Result{
private int status = 0;
private int num_backpack_slots = 0;
private List<Item> items = null;
}
public class Item{
private int id = 0;
private in toriginal_id = 0;
private int defindex = 0;
private int level = 0;
private int quality = 0;
private int inventory = 0;
private int quantity = 0;
private int origin = 0;
private boolean flag_cannot_trade = true;
private List<Equipped> equipped = null;
private List<Attributes> attributes = null;
private boolean flag_cannot_trade = false;
}
public class Equipped{
//private int class = 0; // here json has 'class' field , you cant use this name, use SerializedName
@SerializedName("class") private int myclass = 0;
private int slot = 0
}
public class Attributes{
private int defindex = 0;
private int value = 0;
private doublefloat_value= 0;
}
When you done just run: 完成后，只需运行：
Gson mGson = new Gson();
MyRoot response = mGson.fromJson(jsonString, MyRoot.class);
And now you have class MyRoot with all content. 现在，您拥有了包含所有内容的MyRoot类。 By the way, add get/set for every field. 顺便说一句，为每个字段添加获取/设置。
You can use this source for info 您可以使用此来源获取信息
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