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MindMap Gallery DOM, XML, Sax analysis product information management system development framework

DOM, XML, Sax analysis product information management system development framework

Principle: One-time loading of xml documents, not suitable for large-capacity file reading. DOM parsing can be added, deleted, and changed to DOM parsing to read data at any location, and even read back DOM parsing. Object-oriented programming method (Node, Element, Attribute), Ja...

Edited at 2022-11-07 17:54:13

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DOM, XML, Sax analysis product information management system development framework

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Outline

DOM Manipulations in Angular
- 61
Karan Gupta

DOM, XML, Sax analysis product information management system development framework

Sax analysis

Features

High efficiency, read one line and solve one line. Will not cause memory overflow

dom4j analysis

Introduction

Dom4j is a simple and flexible open source code library for manipulating xml. Dom4j is an excellent tool for manipulating xml. Dom4j is widely used in very open source frameworks. For example: Struts2 hibernate spring framework

use

Because it is a third-party library, the dom4j jar package must be imported into the project lib directory.

The relevant objects in the project used must import the dom4j related jar package.

Dom4j performs CRUD operations

Query operation

Get element

elements(String name) Gets the child element with the specified name and returns a list collection

elements() gets all child elements and returns a list collection

getRootElement() gets the root element

element(String name) returns the child element with the specified name

Get the attribute value of an attribute

Element.attribute(String name) gets an Attribute object

getValues() Gets the attribute value through the getValues() method of the Attribute object

Element.attributeValue(String name); to get the attribute value (simplified operation)

Get text

Element.getText() returns the text information in the element

Element.elementText(String name) directly obtains the text information of the specified sub-element

Create operation

Create elements

DocumentHelper.createElement(String name) returns an Element object

Add properties

addAttribute(String name,String)

Add text

setText(String value)

Modify operations

Modify properties

addAttribute(); If the attribute does not exist, add it. If the attribute exists, modify it.

Modify text

setText() modifies the text information of the element

Delete operation

Element.remove(Attribute att): This method must be called to get the parent element to delete

The remove method provided by the List collection deletes

Xpath and dom4j use

Introduction to Xpath

XPath is a language for finding information in XML documents. XPath can be used to traverse elements and attributes in XML documents

Xpath syntax

/AAA/CCC CCC label under AAA label

//All BBB tags in the BBB document

/AAA/CCC/DDD/* All child elements under the DDD tag under the CCC tag under the AAA tag

//BBB[@id='b1'] All BBB tags with id=b1

Xpath usage

The jar package must be imported otherwise an exception will be reported

Instructions

document.selectNodes("Xpath expression"); Find multiple matches

document.selectSinggleNode("Xpath expression"); Find a single match

MVC pattern

Model

View

Controller

Product information management system

introduction

System functions

Add products

Delete product

Modify product

Check product

system structure