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How to understand the Spring custom attribute editor, in view of this problem, this article introduces the corresponding analysis and solutions in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

Spring Custom attribute Editor

Normal attributes can be injected when Spring DI is injected, but those of type Date are not recognized. At this point, the string in the configuration file can be converted into the corresponding object for injection through the Spring attribute editor.

Spring has its own attribute editor, and we can also write custom attribute editors

Custom attribute Editor:

Inherit the java.beans.PropertyEditorSupport class and override the setAsText (String text) method in it.

Then inject the custom attribute editor into Spring.

Example:

JavaBean class

Java code

Package com.cos.entity; import java.util.Date; import java.util.List; import java.util.Map; import java.util.Set; public class UserBean {private Date birthday; public Date getBirthday () {return birthday;} public void setBirthday (Date birthday) {this.birthday = birthday;}}

Custom attribute Editor

Java code

Package com.cos.entity; import java.beans.PropertyEditorSupport; import java.text.ParseException; import java.text.SimpleDateFormat; / / write a custom attribute editor to inherit the format of PropertyEditorSupport public class DatePropertyEditor extends PropertyEditorSupport {/ / time String format; public String getFormat () {return format } public void setFormat (String format) {this.format = format;} / / the setAsText () method @ Override public void setAsText (String text) of the attribute Editor needs to be overridden {try {SimpleDateFormat f = new SimpleDateFormat (format) / / transfer the converted value to this.setValue (f.parse (text));} catch (ParseException ex) {ex.printStackTrace ();}

Spring profile applicationContext.xml:

Xml code

The org.springframework.beans.factory.config.CustomEditorConfigurer class can read the PropertyEditorSupport class and its subclasses and convert the string to the specified type.

The PropertyEditorSupport class injects the Date type to be converted into customEditors Map.

Test class:

Java code

Package com.cos.entity; import org.springframework.beans.factory.BeanFactory; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main {public static void main (String [] args) {/ / returns Bean's factory object BeanFactory factory = new ClassPathXmlApplicationContext ("applicationContext.xml") through the spring configuration file / / Bean factory gets JavaBean UserBean ub = (UserBean) factory.getBean ("userBean") through Bean's id; System.out.println ("" + ub.getBirthday ()) }} the answer to the question on how to understand the Spring Custom attribute Editor is shared here. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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