Solve the problem of slow performance of loading XML files by dom4j

Use in the Code:

1: incluenthelper. parsetext

2:

Saxreader reader = new saxreader ();

Document extdocument = reader. Read (new file (extmapperpackagepath ));

It takes 1 second to load the XML file of 3 kb each time. Performance is extremely slow. After a long time, I finally found the cause, which was originally caused by the xmldtd file verification.

 

Solution: Skip DTD verification.

Step 1: Create a class

 Package  Com. My. Common. generator. myplugins;  Import  Java. Io. bytearrayinputstream; Import  Java. Io. ioexception;  Import  Org. xml. Sax. entityresolver;  Import  Org. xml. Sax. inputsource;  Import  Org. xml. Sax. saxexception;  Public   Class Ignoredtdentityresolver Implements  Entityresolver {@ override  Public Inputsource resolveentity (string publicid, string systemid)Throws  Saxexception, ioexception {  Return   New Inputsource ( New Bytearrayinputstream ("<? XML version = '1. 0' encoding = 'utf-8'?> " . Getbytes ()));}} 

View code

 

Step 2: Ignore Verification

Saxreader reader = new saxreader (false );
// Ignore DTD to reduce latency
Reader. setentityresolver (New ignoredtdentityresolver ());

Document extdocument = reader. Read (new file (extmapperpackagepath ));

 

Note:

Documenthelper. parsetext is replaced by the following code:

Saxreader reader = new saxreader (false );
// Ignore DTD to reduce latency
Reader. setentityresolver (New ignoredtdentityresolver ());

Element basemapperrootelement = reader. Read (New inputsource (New stringreader (sqlmap. tostring ())))

 

Note: saxreader can be reused when XML is read multiple times.

 

Solve the problem of slow performance of loading XML files by dom4j