Xml and json

 

XML: easy to expand and redundant.

It is represented by <>. As shown in:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

    <mapper  namespace="zhuxuekui.data.UserMapper">

        <resultMap id="userResultMap"  type="User">

            <result property="name" column="username"></result>

            <result property="email" column="email"></result>

        </resultMap>        

        <select id="selectUser" parameterType="String"

            resultMap="userResultMap">

            select 

            *

            from user where username = #{username}

        </select>

    </mapper>

JSON: it is not easy to expand, but has little redundancy and lightweight development.

Reference: http://www.cnblogs.com/mydomain/archive/2010/12/02/1895018.html JSON basics Summary

Http://www.cnblogs.com/mydomain/archive/2010/12/02/1895030.html

An object is an unordered set of 'name/value' pairs. An object starts with "{" (left parenthesis) and ends with "}" (right Parenthesis. Each "name" is followed by a ":" (colon); "," (comma) is used to separate the "name/value" pairs. [7]

An array is an ordered set of values. An array starts with "[" (left square brackets) and ends with "]" (right square brackets. Values are separated by commas.

Value can be a string, number, true, false, null, object, or array enclosed by double quotation marks ). These structures can be nested.

A string is a collection of any number of Unicode characters enclosed by double quotes. It is escaped using a backslash. A character (character) is a separate string (character string ). A string is very similar to a C or Java string.

Although a JSON string is called a string, its full process is called JavaScript Object Notation-JavaScript Object Notation. This string is parsed as an Object in js, And it is syntax-level. Intra-row blocking is required.

{} Is an object with many attributes. [] Indicates an array. There can be two objects, so you can write one.

{} Can also contain [], which indicates multiple objects.

We can think that http is a network protocol, while JSON is a data protocol, which is used for data transmission.

The above is xml, and the following is json:

String, number, object, array, true, false, null

JSON

{"menu": {

"id": "file",

"value": "File:",

"popup": {

"menuitem": [

{"value": "New", "onclick": "CreateNewDoc()"},

{"value": "Open", "onclick": "OpenDoc()"},

{"value": "Close", "onclick": "CloseDoc()"}

]

}

}

}

XML

<menu id="file" value="File" >

<popup>

<menuitem value="New" onclick="CreateNewDoc()" />

<menuitem value="Open" onclick="OpenDoc()" />

<menuitem value="Close" onclick="CloseDoc()" />

</popup>

</menu>