Simple analysis and application of the principle of converter realization of DWR

We use DWR to invoke the remote method to involve the data conversion between JS and JAVA parameters and return values, for example:

The conversion between JS 123 and Java int or Integer, long

The conversion between JS "2009-06-23" and Java java.util.Date

Conversion between JS "[1,2,3]" and Java int[]

JS "{id:123, Name: ' Unmi '}" and Java Class person{int ID; Conversion between String name}

or more complex nested types ("{id:123, Name: ' Unmi ', blogs: [' http://unmi.blogjava.net ', ' Http://blog.csdn.net/kypfos ']}") and conversions between Java types Wait a minute. So how did all this happen? In fact, we have seen a lot of component type mappings, such as Java PropertyEditor, Hibernate (usertype), IBatis (Typehandler) type mappings, STRUTS1/2 used in Form/model Converter and so on.

Here I will analyze the Converter implementation of DWR and explain how to customize my Converter. The DWR used in this article is the 2.0.5 version.

1. DWR built-in Converter and application types

Name	Type of application	Converters
Null	Void,java.lang.void	Nullconverter
Enum		Enumconverter
Primitive	Boolean,byte,short,int, Long,float,double,char, Java.lang.boolean,java.lang.byte, Java.lang.Short, Java.lang.integer,java.lang.long, Java.lang.Float, Java.lang.double,java.lang.character	Primitiveconverter
BigNumber	Java.math.biginteger,java.math.bigdecimal	Bignumberconverter
String	Java.lang.String	Stringconverter
Array	[z,[b,[s,[i,[j,[f,[d,[c,[l*	Arrayconverter
Map	Java.util.Map	Mapconverter
Collection	Java.util.Collection	Collectionconverter
Date	Java.util.date,java.sql.date, Java.sql.Time, Java.sql.Timestamp, Java.util.Calendar	DateConverter
Dom	Org.w3c.dom.node,org.w3c.dom.element, Org.w3c.dom.Document	Domconverter
dom4j	Org.dom4j.document,org.dom4j.element, Org.dom4j.Node	Dom4jconverter
Jdom	Org.jdom.document,org.jdom.element	Jdomconverter
Xom	Nu.xom.document,nu.xom.element, Nu.xom.Node	Xomconverter
Servlet	Javax.servlet.ServletConfig, Javax.servlet.ServletContext, Javax.servlet.http.HttpServletRequest, Javax.servlet.http.HttpServletResponse, Javax.servlet.http.HttpSession	Servletconverter
Bean		Beanconverter
Object		Objectconverter
Hibernate2		H2beanconverter
Hibernate3		H3beanconverter
Url	Java.net.URL	Urlconverter
exception		Exceptionconverter
Miniexception	Java.lang.Throwable	Minimalistexceptionconverter