Home > Java > What are the differences between SAX and DOM parser.

What are the differences between SAX and DOM parser.

Both SAX and DOM are used to parse the XML document. Both has advantages and disadvantages and can be used in our programming depending on the situation.



Parses node by node

Stores the entire XML document into memory before processing

Doesn’t store the XML in memory

Occupies more memory

We can’t insert or delete a node

We can insert or delete nodes

Top to bottom traversing

Traverse in any direction.

SAX is an event based parser

DOM is a tree model parser

SAX is a Simple API for XML

Document Object Model (DOM) API

import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

import javax.xml.parsers.*;
import org.w3c.dom.*;

doesn’t preserve comments

preserves comments

SAX generally runs a little faster than DOM

SAX generally runs a little faster than DOM


If we need to find a node and doesn’t need to insert or delete we can go with SAX itself otherwise DOM provided we have more memory.


More Info:  SAX Parser is the one which is developed to run the java programs especially. It uses a memory resident model. DOM is developed by w3c consortium so that it is an open standard. In DOM the xml file is arranged as a tree and backward and forward search is possible for searching the tags and evaluating the data which it holds. It depends upon the application and ease of data accessiblity. If we want to extract the data from a xml file once we have to move to SAX which is one time top to bottom read approach and if we want ot randomly pick the data in an xml file then the tree reperesentation of DOM model is to be put into use.

Categories: Java
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