Custom Attribute Editor in Spring: customeditorconfigurer

What is the attribute editor?
* Custom Attribute Editor. the strings in the spring configuration file are converted to corresponding objects for injection.
Spring already has a built-in property editor. We can customize the property editor as needed.

* How to define the Attribute Editor?
* Inherits the propertyeditorsupport class and overwrites the setastext () method. For details, see utildatepropertyeditor. java.
* Register the property editor to spring. For details, see applicationcontext. xml.

For example:
There is a class with a date attribute

Java code  

1. Public class bean1 {
2. Private date datevalue;
3. Public void setdatevalue (date datevalue ){
4. This. datevalue = datevalue;
5. }
6. }

The applicationcontext. xml configuration file is as follows:

Java code  

1. <! -- Assign the value of date in bean1 to 2008-08-15. Spring considers 2008-08-15 to be a string and cannot be converted to date. An error is returned! -->
2. <Bean id = "bean1" class = "com. bjsxt. Spring. bean1">
3. <Property name = "datevalue">
4. <Value> 2008-08-15 </value>
5. </Property>
6. </Bean>
7. <! -- Defines the Attribute Editor -->
8. <Bean id = "customeditorconfigurer" class = "org. springframework. Beans. Factory. config. customeditorconfigurer">
9. <Property name = "customeditors">
10. <Map>
11. <Entry key = "Java. util. Date">
12. <Bean class = "com. bjsxt. Spring. utildatepropertyeditor">
13. <! -- Inject the format and flexibly process the format. -->
14. <Property name = "format" value = "yyyy-mm-dd"/>
15. </Bean>
16. </Entry>
17. </Map>
18. </Property>
19. </Bean>

Utildatepropertyeditor. Java is as follows. It must inherit the java. Beans. propertyeditorsupport class and overwrite the setastext () method.

Java code  

1. Import java. Beans. propertyeditorsupport;
2. Import java. Text. parseexception;
3. Import java. Text. simpledateformat;
4. Import java. util. date;
6. /**
7. * Java. util. Date Attribute Editor
8. * @ Author Administrator
9. *
10. */
11. Public class utildatepropertyeditor extends propertyeditorsupport {
13. Private string format = "yyyy-mm-dd ";
15. @ Override
16. Public void setastext (string text) throws illegalargumentexception {
17. System. Out. println ("utildatepropertyeditor. saveastext () -- text =" + text );
19. Simpledateformat SDF = new simpledateformat (format );
20. Try {
21. Date d = SDF. parse (text );
22. This. setvalue (d );
23. } Catch (parseexception e ){
24. E. printstacktrace ();
25. }
26. }
28. Public void setformat (string format ){
29. This. format = format;
30. }
32. }

This completes the correct parsing. Note that customeditors is the attribute provided by spring customeditorconfigurer and is a map, which stores custom editors ), for example, the utildatepropertyeditor date editor is stored here. You can see the customeditorconfigurer source code.

Test:

Java code  

1. Import org. springframework. Beans. Factory. beanfactory;
2. Import org. springframework. Context. Support. classpathxmlapplicationcontext;
4. Import JUnit. Framework. testcase;
6. Public class injectiontest extends testcase {
8. Private beanfactory factory;
10. @ Override
11. Protected void setup () throws exception {
12. Factory = new classpathxmlapplicationcontext ("applicationcontext. xml ");
13. }
15. Public void testinjection1 (){
16. Bean1 bean1 = (bean1) Factory. getbean ("bean1 ");
17. System. Out. println ("bean1.datevalue =" + bean1.getdatevalue ());
18. }
20. }

You can print the date.