Stripes视图框架Java对象属性验证，它允许对字段设置是否必须填写，对数字大小进行限制等。我用prototype.js Ajax 将验证后的数据及时地展示出来，下面来看程序。
1、编写User实体类
此用户共三个属性： name、email、age.
package com.boonya.stripes.entity; public class User { private String name; private String email; private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
2、编写UserActionBean视图控制Action类
此类中包含了用户输入界面(userRegister.jsp)和用户数据提交完成后的数据展示界面(userInfo.jsp)，我们要验证的是用户的数据合法的时候才展示用户数据。
package com.boonya.stripes.actions; import com.boonya.stripes.entity.User; import net.sourceforge.stripes.action.DefaultHandler; import net.sourceforge.stripes.action.ForwardResolution; import net.sourceforge.stripes.action.Resolution; import net.sourceforge.stripes.action.SessionScope; import net.sourceforge.stripes.validation.Validate; import net.sourceforge.stripes.validation.ValidateNestedProperties; @SessionScope public class UserActionBean extends AbstractActionBean { private static final long serialVersionUID = 1L; protected static final String REGISTER="/WEB-INF/userRegister.jsp"; protected static final String USER_INFO="/WEB-INF/userInfo.jsp"; @ValidateNestedProperties({ @Validate(field ="name",required=true,on = {"viewUserInfo"}), @Validate(field ="email",required=true,on = {"viewUserInfo"}), @Validate(field ="age", required = true, minvalue = 13, on = {"viewUserInfo"}) }) private User user; @DefaultHandler public Resolution register() { return new ForwardResolution(REGISTER); } public Resolution viewUserInfo(){ return new ForwardResolution(USER_INFO); } public void setUser(User user) { this.user = user; } public User getUser() { return user; } }
注：@ValidateNestedProperties 验证对象包含的特殊属性字段值的限制；@Validate 具体验证的字段。filed表示字段、required表示是否必需、on表示绑定到的事件方法。
3、编写界面操作的Jsp文件
userRegister.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib prefix="stripes" uri="http://stripes.sourceforge.net/stripes.tld"%>
<html>
<head>
<title>User-Register</title>
<script src="../js/prototype.js" type="text/javascript"></script>
<script type="text/javascript">
function userHandleAjax() {
var myAjax = new Ajax.Updater(‘user‘,
‘<stripes:url beanclass="com.boonya.stripes.actions.UserActionBean" event="viewUserInfo"/>‘,
{
method: ‘get‘,
parameters:Form.serialize(‘userForm‘)
});
}
</script>
</head>
<body>
<stripes:errors globalErrorsOnly="false"/>
<stripes:form beanclass="com.boonya.stripes.actions.UserActionBean" id="userForm">
Update user info: <br>
Name: <stripes:text name="user.name" />
<br>
Email: <stripes:text name="user.email" />
<br>
Age:<stripes:text name="user.age" />
<br>
<stripes:button name="PrototypeAjax" value="Go to User View" onclick="userHandleAjax()" />
<div id="user"></div>
</stripes:form>
</body>
</html>
userInfo.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="stripes" uri="http://stripes.sourceforge.net/stripes.tld"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <title>User-Info</title> <body> <h4>User‘s info</h4><br/> Hello <font color="red">${actionBean.user.name}</font> <br /> Email: <font color="blue">${actionBean.user.email}</font> <br /> age: <font color="blue">${actionBean.user.age}</font> <br> </body> </html>
注：表单字段赋值：对象.属性 即user.name等等；而取值以$(actionBean.对象.属性)，即${actionBean.user.name}等等;
4、测试表单提交数据异常处理
故意少输入参数，页面显示请求不正常页面：
产生的异常代码提示：
Caused by: java.util.MissingResourceException: Could not find an error message with any of the following keys: ‘com.boonya.stripes.actions.UserActionBean.user.age.valueNotPresent‘, ‘com.boonya.stripes.actions.UserActionBean.user.age.errorMessage‘, ‘/actions/User.action.user.age.valueNotPresent‘, ‘/actions/User.action.user.age.errorMessage‘, ‘user.age.valueNotPresent‘, ‘user.age.errorMessage‘, ‘com.boonya.stripes.actions.UserActionBean.valueNotPresent‘.com.boonya.stripes.actions.UserActionBean.errorMessage‘, ‘/actions/User.action.valueNotPresent‘, ‘/actions/User.action.errorMessage‘, ‘validation.required.valueNotPresent‘.
at net.sourceforge.stripes.validation.ScopedLocalizableError.getMessageTemplate(ScopedLocalizableError.java:164)
at net.sourceforge.stripes.action.SimpleMessage.getMessage(SimpleMessage.java:91)
at net.sourceforge.stripes.validation.SimpleError.getMessage(SimpleError.java:102)
at net.sourceforge.stripes.tag.ErrorsTag.doEndTag(ErrorsTag.java:349)
at org.apache.jsp.WEB_002dINF.userRegister_jsp._jspService(userRegister_jsp.java:109)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
... 46 more
当Stripes验证失败时，不知道怎样返回这些错误信息，解决方案也很简单：从 Stripes 包中复制一份 StripesResources.properties 到项目的源代码跟目录下（与WEB/classess同级）即可。加入StripesResources.properties文件后输入：name=boonya,email=boonyachengdu@gmail.com,age=12.;测试效果如下图所示：
此时，年龄验证错误；但是Stripes的错误消息已经知道该怎么提示错误信息给用户了。
5、测试正确的验证和Ajax效果
在表单输入框中输入符合验证条件的数据如：name=boonya,email=boonyachengdu@gmail.com,age=23.;效果如下图所示：
至此，整个示例程序测试完毕。