Question

所以我有以下Json文件：

["burger" : [{"Name": "Chicken Burger", "Price": 3.00},{"Name": "Cheeseburger", "Price": 2.00},{"Name": "beef burger", "Price": 2.00}]"burgerToppings" : [{"Name": "Lettuce"},{"Name": "Tomato"},{"Name":"Cucumber"},]"burgerSauces" : [{"Name": "Mayo"},{"Name": "ketchup"},{"Name": "Spicey mayo"}]]

我想将“汉堡”的名称和价格存储在单独的ArrayList中。

一个后续问题是我希望能够将新值/元素添加到JSONArray

更新：这是在Java中，eclipse

Answer 1

您将不得不使用该模式来修复一些缺少的属性，例如burgerSausce等。尽管您有所了解

看起来您的JSON格式错误。我相信您正在寻找的是：

    {"burger" : 

  { "burgerTypes" :
   [
     {"Name": "Chicken Burger", "Price": 3.00},
     {"Name": "Cheeseburger", "Price": 2.00},
     {"Name": "beef burger", "Price": 2.00}
   ]
   },

   "burgerToppings" : [
      {"Name": "Lettuce"},
      {"Name": "Tomato"},
      {"Name":"Cucumber"}
    ],
    "burgerSauces" : [  
      {"Name": "Mayo"},
      {"Name": "ketchup"},
      {"Name": "Spicey mayo"}
    ]  
}

我将采用该JSON，将其转换为模式，然后通过转换器运行它以创建一些POJO。生成POJO后，请使用Jackson来完成工作。

我去了http://www.jsonschema2pojo.org/并生成了以下内容：

    -----------------------------------com.example.Burger.java-----------------------------------

package com.example;

import java.util.List;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"burgerTypes"
})
public class Burger {

@JsonProperty("burgerTypes")
public List<BurgerType> burgerTypes = null;

}
-----------------------------------com.example.BurgerSauce.java-----------------------------------

package com.example;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"Name"
})
public class BurgerSauce {

@JsonProperty("Name")
public String name;

}
-----------------------------------com.example.BurgerTopping.java-----------------------------------

package com.example;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"Name"
})
public class BurgerTopping {

@JsonProperty("Name")
public String name;

}
-----------------------------------com.example.BurgerType.java-----------------------------------

package com.example;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"Name",
"Price"
})
public class BurgerType {

@JsonProperty("Name")
public String name;
@JsonProperty("Price")
public Float price;

}
-----------------------------------com.example.Example.java-----------------------------------

package com.example;

import java.util.List;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"burger",
"burgerToppings",
"burgerSauces"
})
public class Example {

@JsonProperty("burger")
public Burger burger;
@JsonProperty("burgerToppings")
public List<BurgerTopping> burgerToppings = null;
@JsonProperty("burgerSauces")
public List<BurgerSauce> burgerSauces = null;

}

现在有了实体，您可以简单地致电：

Burger burger = objectMapper.readValue(json, Burger.class);

Answer 2

您可以使用here轻松完成此操作（一旦您修复了JSON格式）

[{"burger" : [{"Name": "Chicken Burger", "Price": 3.00},{"Name": "Cheeseburger", "Price": 2.00},{"Name": "beef burger", "Price": 2.00}],"burgerToppings" : [{"Name": "Lettuce"},{"Name": "Tomato"},{"Name":"Cucumber"}],"burgerSauces" : [{"Name": "Mayo"},{"Name": "ketchup"},{"Name": "Spicey mayo"}]}]

$[0].burger..Name

[
   "Chicken Burger",
   "Cheeseburger",
   "beef burger"
]

还有

$[0].burger..Price

[
   3.0,
   2.0,
   2.0
]

读取具有多个元素的JSON数组并将值附加到JsonArray / JAVA中

2 个答案: