Implementation of json front-end and back-end data interaction methods

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1. Introduction

Official JSON introduction WIKI Encyclopedia. JavaScript object notation.

JSON: JSON data has two forms, one is an unordered collection of key-value pairs (object), and the other is an ordered collection of values ​​(array).

{string : value, ...} object

• {
    "birthday": "1996-1-1",
    "name": "王小二",
    "comment": "这是注释",
    "major": [
      "Information",
      "Math"
    ],
    "has_girlFriend": false,
    "age": 22
  }

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  [value, ...] array
  

• [{
    "birthday": "1996-1-1",
    "name": "王小二",
    "comment": "这是注释",
    "major": [
      "Information",
      "Math"
    ],
    "has_girlFriend": false,
    "age": 22
  },
  {
    "birthday": "1997-1-1"
  },
    "name",
    "age"
  ]

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There are 7 value forms of value:

• object, array

• number, string, (true, false), null

2. Use JSON-java class library

in In java, operations on JSON data.

Mainly the use of the JSONObject class, there are multiple ways to generate JSONObject objects:

Directly generate new JSONObject objects, and put key-value through the put method.

Generate objects by constructing a Map object, putting key-value in through the put method, and then passing in the constructor of the JSONObject object.

Generate objects by constructing a Bean object and then passing in the constructor of the JSONObject object.

Read the text file of JSON data through IO, read the data as a String string, and then pass it into the constructor of the JSONObject object to generate the object.

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