休眠和弹簧mvc组合​​不能正常工作

Question

我正在学习spring hvc的spring。我已经尝试了一个教程，其中显示了反向工程和hbm.xml。但我想为它使用带注释的域类。为此我尝试了一些，但没有运气。我使用spring和hibernate框架在NetBeans中进行了一个Web项目。当我提交表单时，它工作正常，并重定向到其他页面，但数据未保存。有谁可以请帮助我吗？这里是我的尝试下面::

我的项目结构>>>

我的调度员servlet.xml中>>>

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns:context="http://www.springframework.org/schema/context" 
     xmlns:mvc="http://www.springframework.org/schema/mvc" 
     xmlns:p="http://www.springframework.org/schema/p" 
     xmlns:aop="http://www.springframework.org/schema/aop" 
     xmlns:tx="http://www.springframework.org/schema/tx" 
     xsi:schemaLocation="http://www.springframework.org/schema/beans 
     http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
     http://www.springframework.org/schema/aop 
     http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
     http://www.springframework.org/schema/tx 
     http://www.springframework.org/schema/tx/spring-tx-3.1.xsd 
    http://www.springframework.org/schema/context 
     http://www.springframework.org/schema/context/spring-context-3.0.xsd 
     http://www.springframework.org/schema/mvc 
     http://www.springframework.org/schema/mvc/spring-mvc.xsd"> 


    <context:component-scan base-package="com.controller" />  
    <mvc:annotation-driven/> 

    <bean id="viewResolver" 
      class="org.springframework.web.servlet.view.InternalResourceViewResolver" 
      p:prefix="/WEB-INF/jsp/" 
      p:suffix=".jsp" /> 

</beans> 

我的应用程序上下文>>

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns:p="http://www.springframework.org/schema/p" 
     xmlns:aop="http://www.springframework.org/schema/aop" 
     xmlns:tx="http://www.springframework.org/schema/tx" 
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> 



</beans> 

我的web.xml >>

<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> 
    <context-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>/WEB-INF/applicationContext.xml</param-value> 
    </context-param> 
    <listener> 
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 
    <servlet> 
     <servlet-name>dispatcher</servlet-name> 
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
     <load-on-startup>2</load-on-startup> 
    </servlet> 
    <servlet-mapping> 
     <servlet-name>dispatcher</servlet-name> 
     <url-pattern>*.html</url-pattern> 
    </servlet-mapping> 
    <session-config> 
     <session-timeout> 
      30 
     </session-timeout> 
    </session-config> 
    <welcome-file-list> 
     <welcome-file>redirect.jsp</welcome-file> 
    </welcome-file-list> 
</web-app> 

我的hibernate.cfg.xml >>>

<?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.dialect">org.hibernate.dialect.MySQLDialect</property> 
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/springhibernate?zeroDateTimeBehavior=convertToNull</property> 
    <property name="hibernate.connection.username">root</property> 
    <property name="hibernate.jdbc.batch_size">50</property> 
    <property name="hibernate.show_sql">true</property> 
    <property name="hibernate.query.factory_class">org.hibernate.hql.ast.ASTQueryTranslatorFactory</property> 
    </session-factory> 
</hibernate-configuration> 

我的用户控制器>>>

@Controller 
public class UserController { 

    private static SessionFactory factory; 

    @RequestMapping(value="/getForm", method = RequestMethod.GET) 
    public ModelAndView getDemoForm(){   
     ModelAndView model = new ModelAndView("demoForm");   
     return model; 
    } 

    @RequestMapping(value = "/submitDemoForm.html", method = RequestMethod.POST) 
    public ModelAndView submitAdmissionForm(@ModelAttribute("employee") EmployeeAnnotation employee) { 
     try { 
      factory = new AnnotationConfiguration(). 
        configure(). 
        //addPackage("com.xyz") //add package if used. 
        addAnnotatedClass(EmployeeAnnotation.class). 
        buildSessionFactory(); 
     } catch (Throwable ex) { 
      System.err.println("Failed to create sessionFactory object." + ex); 
      throw new ExceptionInInitializerError(ex); 
     } 

     Session session = factory.openSession(); 
     Transaction tx = null; 
     Integer employeeID = null; 
     try { 
      tx = session.beginTransaction(); 
      employeeID = (Integer) session.save(employee); 
      tx.commit(); 
     } catch (HibernateException e) { 
      if (tx != null) { 
       tx.rollback(); 
      } 
      e.printStackTrace(); 
     } finally { 
      session.close(); 
     } 

     ModelAndView model = new ModelAndView("demoFormSuccess"); 

     return model; 
    } 

} 

我EmployeeAnnotation类（POJO）>>>

import javax.persistence.*; 

@Entity 
@Table(name = "employee_annotation") 
public class EmployeeAnnotation { 
    @Id @GeneratedValue 
    @Column(name = "id") 
    private int id; 

    @Column(name = "first_name") 
    private String firstName; 

    @Column(name = "last_name") 
    private String lastName; 

    @Column(name = "salary") 
    private int salary; 

    public EmployeeAnnotation() {} 
    public int getId() { 
     return id; 
    } 
    public void setId(int id) { 
     this.id = id; 
    } 
    public String getFirstName() { 
     return firstName; 
    } 
    public void setFirstName(String first_name) { 
     this.firstName = first_name; 
    } 
    public String getLastName() { 
     return lastName; 
    } 
    public void setLastName(String last_name) { 
     this.lastName = last_name; 
    } 
    public int getSalary() { 
     return salary; 
    } 
    public void setSalary(int salary) { 
     this.salary = salary; 
    } 
} 

我demoForm.jsp >>>

<form action="/springMvcHibernate/submitDemoForm.html" method="post"> 

    <p> 
     Firts Name : <input type="text" name="firstName"/> 
    </p> 
    <p> 
     Last Name : <input type="text" name="lastName"/> 
    </p> 
    <p> 
      Salary : <input type="number" name="salary"/> 
    </p> 
    <input type="submit" value="Submit"/> 

</form> 

我demoFormSuccess.jsp >>>

<body> 
    <h1>ID is :: ${employee.id}</h1> 
</body> 

Answer 1

你必须调用调用Session.flush（）在submitAdmissionForm（）方法调用事务之前提交（），请看从下面的建议Hibernate的API （重点煤矿）：

Force this session to flush. Must be called at the end of a unit of work, before committing the transaction and closing the session (depending on flush-mode, Transaction.commit() calls this method). Flushing is the process of synchronizing the underlying persistent store with persistable state held in memory.

Throws: HibernateException - Indicates problems flushing the session or talking to the database.

https://docs.jboss.org/hibernate/orm/3.5/api/org/hibernate/Session.html#flush()

P.S .:另外，一般来说，将数据库相关逻辑合并到控制器中并不是一个好习惯，您需要遵循服务/ DAO以确保它们易于维护以满足将来的需求。如果只是为了你的学习目的，那很好，你可以做到这一点。