Java - JSON解析器错误 [英] Java - JSON Parser Error

问题描述

我正在创建一个应用程序，它将向Web服务器发送 http 请求。返回将在 json 中。这是 json 的样子

  [//我用了工具，使其美观，易于阅读。 
 {
item_name：Adame，
item_type：Special，
item：Chestplate，
item_min_lvl： 
enchantment：{
health：0.3，
dam：24％，
life：0.1，
xp：24％，
loot：22％
}，
def：73
}，
 
item_name：Sticks'，
item_type：Unique，
item：Stick，
item_min_lvl：4 ，
enchantment：{
health：0.6，
mana：1，
dam：12％，
life：0.3，
xp：17％，
loot：17％
}，
min_dam：39 ，
max_dam：34
}，
 {
item_name：Sword'，
item_type：Unique，
item：剑，
item_min_lvl：8，
enchantment：[]，// colonm 30 is [
min_dam：9 ，
max_dam：10
} 
] 
  

你是c一看，数组里面的数据是不同的。我得到了这个错误，期望BEGIN_OBJECT，但在第1行第30列处为BEGIN_ARRAY。这是我的代码：

  MyJSON [] data = gson.from（jsonString，MyJSON []。class）; 
 
 class MyJSON {
 String item_name; 
 String item_type; 
字符串项目; 
字符串item_min_lvl; 
附魔附魔; 
 String min_dam; 
字符串max_dam; 
 
 @Override 
 public String toString（）{
 StringBuilder builder = new StringBuilder（）; 
 
 builder.append（\\\
item_name：）。append（item_name）; 
 builder.append（\\\
item_type：）。append（item_type）; 
 builder.append（\\\
item：）。append（item）; 
 builder.append（\\\
item_min_lvl：）。append（item_min_lvl）; 
 
 builder.append（\\\
\\\
Enchantment Details：）; 
 builder.append（\\\
health：）。append（enchantment.health）; 
 builder.append（\\\
dam：）。append（enchantment.dam）; 
 builder.append（\\\
life：）。append（enchantment.life）; 
 builder.append（\\\
xp：）。append（enchantment.xp）; 
 builder.append（\\\
loot：）。append（enchantment.loot）; 
 return builder.toString（）; 
} 
} 
 
 class Enchantment {
字符串健康; 
弦乐大坝; 
字符串生活; 
 String xp; 
字符串战利品; 
字符串法力值; 
 
 $ / code> 

任何人都可以帮助我改进我的代码，以便我的代码解析 json 在不同情况下。先谢谢了。 （Ps不是我的web服务器，所以我无法对json做任何事情） 这是有效JSON 除非您已添加注释才能显示问题出在哪里？

注释不应该是JSON的一部分。

下面是我已经在另一篇文章中向您分享的代码 ArrayList< Map< String，Object>> > ，因为JSON字符串中的条目不是对称的。在这种情况下，您不能将其转换为POJO。

  StringBuilder builder = new StringBuilder（）; 
 BufferedReader reader = new BufferedReader（new FileReader（new File（resources / json2.txt）））; 
 String line = null; （（line = reader.readLine（））！= null）{
 builder.append（line）; 
 while 
} 
 reader.close（）; 
 
 Gson gson = new Gson（）; 
 Type listType = new TypeToken< ArrayList< Map< String，Object>>>（）{
} .getType（）; 
 ArrayList< Map< String，Object>> list = gson.fromJson（builder.toString（），listType）; （String key，json.keySet（））{
 System.out.println（key +$）的
 $ b $（Map< String，Object> json：list）{
 ：+ json.get（key））; 
} 
 System.out.println（===========）; 
} 
  

输出：

  item_name：adame 
 item_type：Special 
 item：胸牌
 item_min_lvl：50 
 enchantment：{health = 0.3，dam = 24％， life = 0.1，xp = 24％，loot = 22％} 
 def：73 
 =========== 
 item_name：Sticks'
 item_type：独特的
 item：Stick 
 item_min_lvl：4 
 enchantment：{health = 0.6，mana = 1，dam = 12％，life = 0.3，xp = 17％，loot = 17％} 
 min_dam：39 
 max_dam：34 
 =========== 
 item_name：剑'
 item_type：唯一
 item：剑
 item_min_lvl：8 
 enchantment：[] 
 min_dam：9 
 max_dam：10 
 =========== 
  





---

编辑

结界返回类似于

  enchantment：{health = 0.6，mana = 1，dam = 12％ ，生命= 0.3，xp = 17％，loot = 17％}。 
  

我怎样才能得到健康的例子？

 类型mapType = new TypeToken< Map< String，String>>（）{
} .getType（）; 
 String string ={health = 0.6，mana = 1，dam = 12％，life = 0.3，xp = 17％，loot = 17％}; 
 Map< String，String> map = new Gson（）。fromJson（string，mapType）; 
 for（String key：map.keySet（））{
 System.out.println（key +：+ map.get（key））; 
} 
  

输出：

 生命值：0.6 
法力：1 
 dam：12％
人生：0.3 
 xp：17％
物品：17 ％
  

I am creating an application which it will send http request to a web server. The return will be in json. Here is how the json look like

[//I used a tool to make it beautiful and easy to read.
  {
    "item_name": "Adame",
    "item_type": "Special",
    "item": "Chestplate",
    "item_min_lvl": "50",
    "enchantment": {
      "health": "0.3",
      "dam": "24%",
      "life": "0.1",
      "xp": "24%",
      "loot": "22%"
    },
    "def": "73"
  },
  {
    "item_name": "Sticks'",
    "item_type": "Unique",
    "item": "Stick",
    "item_min_lvl": "4",
    "enchantment": {
      "health": "0.6",
      "mana": "1",
      "dam": "12%",
      "life": "0.3",
      "xp": "17%",
      "loot": "17%"
    },
    "min_dam": "39",
    "max_dam": "34"
  },
  {
    "item_name": "Sword'",
    "item_type": "Unique",
    "item": "Sword",
    "item_min_lvl": "8",
    "enchantment": [], //colonm 30 is [
    "min_dam": "9",
    "max_dam": "10"
  }
]

Are you can see, the data inside the array are different. I got this error, Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 30. This is my code:

MyJSON[] data = gson.from(jsonString, MyJSON[].class);

class MyJSON {
    String item_name;
    String item_type;
    String item;
    String item_min_lvl;
    Enchantment enchantment;
    String min_dam;
    String max_dam;

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();

        builder.append("\nitem_name:").append(item_name);
        builder.append("\nitem_type:").append(item_type);
        builder.append("\nitem:").append(item);
        builder.append("\nitem_min_lvl:").append(item_min_lvl);

        builder.append("\n\nEnchantment Details:");
        builder.append("\nhealth:").append(enchantment.health);
        builder.append("\ndam:").append(enchantment.dam);
        builder.append("\nlife:").append(enchantment.life);
        builder.append("\nxp:").append(enchantment.xp);
        builder.append("\nloot:").append(enchantment.loot);
        return builder.toString();
    }
}

class Enchantment {
    String health;
    String dam;
    String life;
    String xp;
    String loot;
    String mana;
}

Can anyone help me to improve my code so my code an parse the json in different case. Thanks in advanced. (P.s. that's not my web server so I can't do anything with the json)

解决方案

This is a Valid JSON unless you have added comments just to show lines where is the issue?

Comments should not be part of JSON.

Here is the code that I have already shared you at you another post Java - Json deserialize data [].

You have to use ArrayList<Map<String, Object>> because the entries in the JSON string are not symmetric. You can't convert it into POJO in this case.

StringBuilder builder = new StringBuilder();
BufferedReader reader = new BufferedReader(new FileReader(new File("resources/json2.txt")));
String line = null;
while ((line = reader.readLine()) != null) {
    builder.append(line);
}
reader.close();

Gson gson = new Gson();
Type listType = new TypeToken<ArrayList<Map<String, Object>>>() {
}.getType();
ArrayList<Map<String, Object>> list = gson.fromJson(builder.toString(), listType);

for (Map<String, Object> json : list) {
    for (String key : json.keySet()) {
        System.out.println(key + ":" + json.get(key));
    }
    System.out.println("===========");
}

output:

item_name:Adame
item_type:Special
item:Chestplate
item_min_lvl:50
enchantment:{health=0.3, dam=24%, life=0.1, xp=24%, loot=22%}
def:73
===========
item_name:Sticks'
item_type:Unique
item:Stick
item_min_lvl:4
enchantment:{health=0.6, mana=1, dam=12%, life=0.3, xp=17%, loot=17%}
min_dam:39
max_dam:34
===========
item_name:Sword'
item_type:Unique
item:Sword
item_min_lvl:8
enchantment:[]
min_dam:9
max_dam:10
===========

---

EDIT

enchantment return something like

enchantment:{health=0.6, mana=1, dam=12%, life=0.3, xp=17%, loot=17%}. 

How can I get for example health?

Type mapType = new TypeToken<Map<String, String>>() {
}.getType();
String string = "{health=0.6, mana=1, dam=12%, life=0.3, xp=17%, loot=17%}";
Map<String, String> map = new Gson().fromJson(string, mapType);
for (String key : map.keySet()) {
    System.out.println(key + ":" + map.get(key));
}

output:

health:0.6
mana:1
dam:12%
life:0.3
xp:17%
loot:17%

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