The strut2 framework is a good source code for validation

src\yzr\ValidateJavaBean\action\RegisterAction-RegisterRequest-validation.xml
src\yzr\ValidateByXml\RegisterAction-RegisterRequest-validation.xml
src\yzr\ValidateByXml\RegisterAction-validation.xml
src\yzr\ValidateByCode\struts-login.xml
src\yzr\ValidateByXml\struts-register.xml
src\yzr\ValidateJavaBean\struts-register.xml
src\struts.xml
src\yzr\ValidateJavaBean\register\User-validation.xml
src\yzr\ValidateByCode\LoginAction.java
src\yzr\ValidateJavaBean\action\RegisterAction.java
src\yzr\ValidateByXml\RegisterAction.java
src\yzr\ValidateJavaBean\register\User.java
U.classpath
.settings\org.eclipse.wst.jsdt.ui.superType.container
.settings\.jsdtscope
.mymetadata
.settings\org.eclipse.wst.jsdt.ui.superType.name
.settings\org.eclipse.jdt.core.prefs
.project
src\yzr\ValidateJavaBean\action
src\yzr\ValidateJavaBean\register
src\yzr\ValidateByCode
src\yzr\ValidateByXml
src\yzr\ValidateJavaBean
src\yzr
src
.myeclipse
.settings

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