我正在使用struts 2和hibernate框架并开发了一个小型CRUD来将数据输入到mysql db中，并验证字段
<select id='select'>
<option value="1">1</option>
<option value="2">2</option>
<option value="3" selected="selected">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<p>text</p> package com.struts2hibernatepagination.hibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "student")
public class Student {
@Id
@GeneratedValue
private int id;
@Column(name = "last_name")
private String lastName;
@Column(name = "first_name")
private String firstName;
private int marks;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public int getMarks() {
return marks;
}
public void setMarks(int marks) {
this.marks = marks;
}
}
package com.struts2hibernatepagination.action;
import java.util.ArrayList;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.struts2hibernatepagination.dao.StudentDAO;
import com.struts2hibernatepagination.hibernate.Student;
public class AddStudentAction extends ActionSupport implements
ModelDriven<Student> {
public AddStudentAction() {
// TODO Auto-generated constructor stub
}
private Student student = new Student();
private List<Student> students = new ArrayList<Student>();
public Student getStudent() {
return student;
}
public void setStudent(Student student) {
this.student = student;
}
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
StudentDAO dao = new StudentDAO();
@Override
public Student getModel() {
// TODO Auto-generated method stub
return student;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
dao.addStudent(student);
String f = student.getFirstName();
String l = student.getLastName();
int m = student.getMarks();
System.out.println(f + l + m + "Inside execute method");
return "success";
}
public String listStudents() {
students = dao.getStudents();
return "success";
}
@Override
public void validate() {
// TODO Auto-generated method stub
if (student.getFirstName() == null) {
String first = student.getFirstName();
System.out.println(first);//this statement is returning null
this.addActionError("Please Enter First Name !!!");
System.out.println("Inside validate method!!");
}
// super.validate();
}
}
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Hello World</title>
<s:head />
</head>
<body>
<s:form action="addStudent">
<s:actionerror />
<s:textfield name="firstName" label="First Name" />
<s:textfield name="lastName" label="Last Name" />
<s:textfield name="marks" label="Marks" />
<s:submit />
<hr />
<table>
<tr>
<th>First Name</th>
<th>Last Name</th>
<th>Marks</th>
</tr>
<s:iterator value="students">
<tr>
<td><s:property value="firstName" /></td>
<td><s:property value="lastName" /></td>
<td><s:property value="marks" /></td>
</tr>
</s:iterator>
</table>
</s:form>
<s:form action="fetchStudentList">
<s:submit>See All Student List</s:submit>
</s:form>
</body>
</html>
package com.struts2hibernatepagination.dao;
import java.util.ArrayList;
import java.util.List;
import javax.transaction.Transaction;
import org.hibernate.Session;
import com.googlecode.s2hibernate.struts2.plugin.annotations.SessionTarget;
import com.googlecode.s2hibernate.struts2.plugin.annotations.TransactionTarget;
import com.struts2hibernatepagination.hibernate.Student;
public class StudentDAO {
// The session object and transaction object will be injected using the
// @SessionTarget
// and @TransactionTarget annotation respectively.
@SessionTarget
Session session;
@TransactionTarget
Transaction transaction;
@SuppressWarnings("unchecked")
public List<Student> getStudents() {
List<Student> students = new ArrayList<Student>();
try {
students = session.createQuery("from Student").list();
} catch (Exception e) {
e.printStackTrace();
}
return students;
}
public void addStudent(Student student) {
try {
session.save(student);
} catch (Exception e) {
e.printStackTrace();
}
}
}
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<package name="default" extends="hibernate-default">
<action name="addStudent" method="execute"
class="com.struts2hibernatepagination.action.AddStudentAction">
<result name="success" type="redirect">
listStudents
</result>
<result name="input">/student.jsp</result>
</action>
<action name="listStudents" method="listStudents"
class="com.struts2hibernatepagination.action.AddStudentAction">
<result name="success">/student.jsp</result>
<result name="input">/student.jsp</result>
</action>
<action name="fetchStudentList"
class="com.struts2hibernatepagination.action.AddStudentAction"
method="listStudents">
<result name="success">/displaytag.jsp</result>
<result name="input">/student.jsp</result>
</action>
</package>
在上面的代码中，在student.jsp上按下提交按钮之后调用execute方法，并且在调用了validate之后，因此即使我输入firstname它也会引发错误以输入firstname，因为验证已完成数据插入数据库后，我出错了？我需要先调用validate方法。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">admin12345</property>
<property name="hibernate.connection.url">jdbc:mysql://192.168.1.3:3306/nupur</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<mapping class="com.struts2hibernatepagination.hibernate.Student" />
</session-factory>
</hibernate-configuration>
答案 0 :(得分：1)
正如您在调试中看到的那样，插件执行它自己的验证。它不是Struts验证，而是使用Hibernate Validator进行bean验证。
您应该选择更适合您需求的验证框架。如果您使用defaultStackHibernateStrutsValidation启用Struts验证，那么您应该从验证中排除一些操作方法并删除input结果。
<action name="listStudents" method="listStudents"
class="com.struts2hibernatepagination.action.AddStudentAction">
<interceptor-ref name="defaultStackHibernateStrutsValidation">
<param name="validation.excludeMethods">listStudents</param>
</interceptor-ref>
<result name="success">/student.jsp</result>
</action>
其他操作也需要堆栈defaultStackHibernateStrutsValidation，因此最好在包
<default-interceptor-ref name="defaultStackHibernateStrutsValidation"/>