Javaweb Learning Summary Nine (XML parsing and tuning JVM memory size)

One: Two ways to parse an XML file

1:dom,document object model.

2:sax,simple API for XML.

3: Compare the pros and cons of Dom and sax parsing XML files

A:dom

Advantages: Dom parsing method will load XML files into memory, according to the structure of XML parsing into a DOM tree, elements, text, attributes will be parsed into objects, convenient for the increase and deletion check.

Disadvantage: If the XML file is larger, the load file memory pressure is large.

B:sax

Advantage: Sax parsing is a one-line read of an XML file, so it does not cause memory pressure.

Disadvantage: Can not be added or deleted to change the operation.

Two: Resizing the JVM memory

1: Class name--right-click--run as--run Configuration

2: Set Memory parameters

Javaweb Learning Summary Nine (XML parsing and tuning JVM memory size)