Struts2 local and global type converters

Define a test class

Package Struts2.example.action;import Java.util.date;public class Helloworldaction {    private Date birthday;    Public Date Getbirthday () {return birthday;} public void Setbirthday (Date birthday) {System.out.print (birthday); this.birthday = Birthday;} Public String Execute () throws Exception{return "Success";}}

Defined in the Struts.xml file

<action name= "list_*" class= "struts2.example.action.HelloWorldAction" method= "{1}" >
<!--define the relationship between processing results and view resources--
<result name= "Success" >/index.jsp</result>
</action>
Runtime at URL input http://localhost: port number/project name/. (namespace): /list_execute.action?birthday=20121181 can complete the jump, the index.jsp through the EL expression ${birthday} output the corresponding birthday value, the output is a week and other information data, is not the original string. Application type converters enable bidirectional conversion of data.

Type converters are divided into two types
Local type converter: works on an action
Global type converter: works on all actions

The so-called type converter inherits a class Defaulttypeconverter and then overrides the method implementation. There are two scenarios for applying a type converter:
1. Conversion of the value of the request parameter to the value of the property
2, using the Struts2 label, for data Echo

Package Struts2.example.type.converter;import Java.sql.date;import Java.text.parseexception;import Java.text.simpledateformat;import Java.util.map;import Com.opensymphony.xwork2.conversion.impl.defaulttypeconverter;public class Datetypeconverter extends Defaulttypeconverter{@Overridepublic Object Convertvalue (map<string, object> context, Object Value,class ToType ) {//TODO auto-generated method Stubsimpledateformat simpledateformat=new SimpleDateFormat ("yyyynndd"); Try{if (ToType ==date.class) {//convert String type to Date type string[] params= (string[]) Value;return simpledateformat.parse (Params[0]);} else if (totype==string.class) {//converts date type to String type Date date= (date) Value;return Simpledateformat.format (date);}} catch (ParseException e) {}return null;}}

As with Struts1, registration is also required in Struts2. Registered Local type converters：
Place the Actionclassname-conversion.properties file under the package where the action class is located, Actionclassname is
The class name of the action, followed by the-conversion.properties is a fixed notation, for this example, the name of the file should
For Helloworldaction.properties.

The content in the properties file is: Property name = Full class name of the type converter
For this example, the contents of the Helloworldaction-conversion.properties file are:
Birthday=struts2.example.type.converter.datetypeconverter

Custom Global type converters : Place xwork-conversion.properties files under Web-inf/classes, in the properties file
The type to be converted = The full class name of the type converter
For the purposes of this example, the contents of the Xwork-conversion.properties file are:
Java.util.date=struts2.example.type.converter.datetypeconverter
In addition, use a global type converter to pay attention to the input data format symbol requirements.

Struts2 local and global type converters