我有一个简单的 spring mvc 项目,用于将用户添加到数据库中。我使用休眠 4.1.9、spring 框架 3.2.0 和 PostgreSQL 9.2。
请参阅下面的代码
用户 bean
package org.vdzundza.beans;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity
@Table(name = "users")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "user_seq")
@SequenceGenerator(name = "user_seq", sequenceName = "user_seq")
@Column(name = "id")
private Long id;
@Column(name = "network")
private String network;
@Column(name = "photo")
private String photo;
@Column(name = "identity")
private String identity;
@Column(name = "firstname")
private String firstName;
@Column(name = "lastname")
private String lastName;
@Column(name = "hash")
private String hash;
@Column(name = "isonline")
private Boolean isOnline;
public User() {
}
//getters and setters
@Override
public String toString(){
StringBuilder out = new StringBuilder();
out.append("[");
out.append("name: " + firstName + " " + lastName);
out.append("\tnetwork: " + network);
out.append("\t Is online: " + isOnline);
return out.toString();
}
}
用户DAO
package org.vdzundza.dao;
import java.util.List;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.vdzundza.beans.User;
@Repository
public class UserDAOImpl implements UserDao {
@Autowired
private SessionFactory sessionFactory;
@Override
public void addUser(User user) {
sessionFactory.openSession().save(user);
}
@SuppressWarnings("unchecked")
@Override
public List<User> listUser() {
return sessionFactory.openSession().createCriteria(User.class).list();
}
}
用户服务
package org.vdzundza.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.vdzundza.beans.User;
import org.vdzundza.dao.UserDao;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDAO;
@Transactional
public void addUser(User user) {
userDAO.addUser(user);
}
@Transactional
public List<User> listUser() {
return userDAO.listUser();
}
}
根上下文.xml
<?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:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
<!-- Root Context: defines shared resources visible to all other web components -->
<context:annotation-config />
<context:component-scan base-package="org.vdzundza.dao" />
<context:component-scan base-package="org.vdzundza.service" />
<bean id="propertiesConfig"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
p:location="/WEB-INF/jdbc.properties" />
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"
lazy-init="false">
<property name="dataSource" ref="dataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
<property name="packagesToScan" value="org.vdzundza.beans" />
</bean>
<bean id="transactionalManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
</beans>
用户控制器
package org.vdzundza.web;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.vdzundza.beans.User;
import org.vdzundza.service.UserService;
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/")
public String index(){
return "redirect:/user/index";
}
@RequestMapping("/index")
public String listUsers(Map<String, Object> map){
map.put("user", new User());
map.put("userList", userService.listUser());
return "user";
}
@RequestMapping(value = "/add",method = RequestMethod.POST)
public String addUser(@ModelAttribute("user") User user, BindingResult result){
userService.addUser(user);
return "redirect:/user/index";
}
}
用户.jsp
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>user test spring and hibernate</title>
</head>
<body>
<a href="${pageContext.request.contextPath}/">Go back</a>
<br />
<form:form method="post"
action="${pageContext.request.contextPath}/user/add"
commandName="user">
<table>
<tr>
<td><form:label path="firstName">First Name</form:label></td>
<td><form:input path="firstName" /></td>
</tr>
<tr>
<td><form:label path="lastName">Last Name</form:label></td>
<td><form:input path="lastName" /></td>
</tr>
<tr>
<td><form:label path="network">network</form:label></td>
<td><form:input path="network" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="add user" /></td>
</tr>
</table>
</form:form>
<c:if test="${empty userList}">
<h2>user list is empty</h2>
</c:if>
<c:if test="${!empty userList}">
<h2>user list</h2>
<table>
<tr>
<th>First name</th>
<th>Last name</th>
<th>Network</th>
</tr>
<c:forEach items="${userList}" var="user">
<tr>
<td>${user.firstName}</td>
<td>${user.lastName}</td>
<td>${user.network}</td>
</tr>
</c:forEach>
</table>
</c:if>
</body>
</html>
新用户未保存在数据库中。当我单击“添加用户”时,我在控制台中看到:
Hibernate: select nextval ('user_seq')
Hibernate: select this_.id as id0_0_, this_.firstname as firstname0_0_, this_.hash as hash0_0_, this_.identity as identity0_0_, this_.isonline as isonline0_0_, this_.lastname as lastname0_0_, this_.network as network0_0_, this_.photo as photo0_0_ from users this_
如何解决这个问题?