问题
I am trying to implement validation using annotations, but these validations don't work and the form gets submitted with null values. I don't know what is missing, how to implement validations using annotations in struts2 in action that implements ModelDriven interface? This is my struts.xml
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="struts-default">
<action name="saveOrUpdateUser" method="saveOrUpdate1" class="com.vaannila.web.Userqqqq">
<result name="success" type="redirect">listUser</result>
<result name="input">/register.jsp</result>
</action>
<action name="listUser" method="list" class="com.vaannila.web.Userqqqq">
<result name="success">/register.jsp</result>
<result name="input">/register.jsp</result>
</action>
<action name="editUser" method="edit" class="com.vaannila.web.Userqqqq">
<result name="success">/register.jsp</result>
<result name="input">/register.jsp</result>
</action>
<action name="deleteUser" method="delete" class="com.vaannila.web.Userqqqq">
<result name="success" type="redirect">listUser</result>
<result name="input">/register.jsp</result>
</action>
</package>
</struts>
This is my jsp page
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Registration Page</title>
<s:head />
<style type="text/css">
@import url(style.css);
</style>
</head>
<body>
<s:actionerror/>
<s:form action="saveOrUpdateUser" validate="true">
<s:push value="user">
<s:hidden name="id" />
<s:textfield name="name" label="User Name" required="true"/>
<s:radio name="gender" label="Gender" list="{'Male','Female'}" />
<s:select name="country" list="{'India','USA','UK'}" headerKey=""
headerValue="Select" label="Select a country" />
<s:textarea name="aboutYou" label="About You" />
<s:checkbox name="mailingList"
label="Would you like to join our mailing list?" />
<s:submit />
</s:push>
</s:form>
<s:if test="userList.size() > 0">
<div class="content">
<table class="userTable" cellpadding="5px">
<tr class="even">
<th>Name</th>
<th>Gender</th>
<th>Country</th>
<th>About You</th>
<th>Mailing List</th>
<th>Edit</th>
<th>Delete</th>
</tr>
<s:iterator value="userList" status="userStatus">
<tr
class="<s:if test="#userStatus.odd == true ">odd</s:if><s:else>even</s:else>">
<td><s:property value="name" /></td>
<td><s:property value="gender" /></td>
<td><s:property value="country" /></td>
<td><s:property value="aboutYou" /></td>
<td><s:property value="mailingList" /></td>
<td><s:url id="editURL" action="editUser">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{editURL}">Edit</s:a></td>
<td><s:url id="deleteURL" action="deleteUser">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{deleteURL}">Delete</s:a></td>
</tr>
</s:iterator>
</table>
</div>
</s:if>
</body>
</html>
This is my action class
package com.vaannila.web;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.vaannila.dao.UserDAO;
import com.vaannila.domain.User;
public class UserAction extends ActionSupport implements ModelDriven<User> {
private static final long serialVersionUID = -6659925652584240539L;
private User user = new User();
private List<User> userList = new ArrayList<User>();
private UserDAO userDAO = new UserDAO();
@Override
public User getModel() {
return user;
}
/**
* To save or update user.
* @return String
*/
public String saveOrUpdate()
{
System.out.println(user.getName());
userDAO.saveOrUpdateUser(user);
return SUCCESS;
}
/**
* To list all users.
* @return String
*/
public String list()
{
userList = userDAO.listUser();
return SUCCESS;
}
/**
* To delete a user.
* @return String
*/
public String delete()
{
HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
userDAO.deleteUser(Long.parseLong(request.getParameter("id")));
return SUCCESS;
}
/**
* To list a single user by Id.
* @return String
*/
public String edit()
{
HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
user = userDAO.listUserById(Long.parseLong(request.getParameter("id")));
return SUCCESS;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<User> getUserList() {
return userList;
}
public void setUserList(List<User> userList) {
this.userList = userList;
}
}
This is my BEAN
package com.vaannila.domain;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import com.opensymphony.xwork2.validator.annotations.RequiredFieldValidator;
import com.opensymphony.xwork2.validator.annotations.ValidatorType;
@Entity
@Table(name="USER1")
public class User {
private Long id;
private String name;
private String gender;
private String country;
private String aboutYou;
private Boolean mailingList;
@Id
@GeneratedValue
@Column(name="USER_ID")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@RequiredFieldValidator(type = ValidatorType.SIMPLE, fieldName = "name", message = "User Name field is empty.")
@Column(name="USER_NAME")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@RequiredFieldValidator(type = ValidatorType.SIMPLE, fieldName = "gender", message = "gender field is empty.")
@Column(name="USER_GENDER")
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
@Column(name="USER_COUNTRY")
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
@Column(name="USER_ABOUT_YOU")
public String getAboutYou() {
return aboutYou;
}
public void setAboutYou(String aboutYou) {
this.aboutYou = aboutYou;
}
@Column(name="USER_MAILING_LIST")
public Boolean getMailingList() {
return mailingList;
}
public void setMailingList(Boolean mailingList) {
this.mailingList = mailingList;
}
}
回答1:
You need to add @VisitorFieldValidator annotation to user getter inside your action class.
@VisitorFieldValidator(appendPrefix = false)
public User getUser() {
return user;
}
Note that you need to set appendPrefix to false if your are using field names without user. prefix in JSP.
Also, you are probably want @RequiredStringValidator not @RequiredFieldValidator inside your bean.
@RequiredStringValidator(message = "User Name field is empty.")
@Column(name="USER_NAME")
public String getName() {
return name;
}
来源：https://stackoverflow.com/questions/15052157/how-to-implement-validations-using-annotations-in-struts2-in-action-that-impleme