初学S2SH搭建（二）

一、Srping 与 Hibnernate 的整合

（4）开发

       这里采用自底向上的开发模式。

       （a）底层的开发

       打开DB Explorer，连接上数据库，找到我们所需要的表，然后点击右键选择【Hibernate reverse Engineering】

Id Generator选择native，如果是Oracle可以选择increment




 

生成的代码如下：Employee.java

package cn.zhang.crm.model.pojo; /**  *Employeeentity.@authorMyEclipsePersistenceTools  */ publicclass Employee implements java.io.Serializable {     privatestaticfinallongserialVersionUID = 4740966089797222237L;     private Integer id;     private String name;     private String address;     private String phone;     // Constructors     /**defaultconstructor*/     public Employee() {     }     /**fullconstructor*/     public Employee(String name, String address, String phone) {        this.name = name;        this.address = address;        this.phone = phone;     }     // Property accessors     public Integer getId() {        returnthis.id;     }     publicvoid setId(Integer id) {        this.id = id;     }     public String getName() {        returnthis.name;     }     publicvoid setName(String name) {        this.name = name;     }     public String getAddress() {        returnthis.address;     }     publicvoid setAddress(String address) {        this.address = address;     }     public String getPhone() {        returnthis.phone;     }     publicvoid setPhone(String phone) {        this.phone = phone;     } }

Employee.hbm.xml

<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <!--     Mapping file autogenerated by MyEclipse Persistence Tools --> <hibernate-mapping>     <class name="cn.zhang.crm.model.pojo.Employee" table="employee" catalog="test">         <id name="id" type="java.lang.Integer">             <column name="id" />             <generator class="native"></generator>         </id>         <property name="name" type="java.lang.String">             <column name="name" />         </property>         <property name="address" type="java.lang.String">             <column name="address" />         </property>         <property name="phone" type="java.lang.String">             <column name="phone" />         </property>     </class> </hibernate-mapping>

同时我们需要将Employee.hbm.xml的路径放到applicationContext中。

<property name="mappingResources">            <list>               <value>cn/zhang/crm/model/pojo/Employee.hbm.xml</value>            </list> </property>

（b）DAO接口

实现CRUD方法，具体的EmployeeDao.java代码如下：

package cn.zhang.crm.dao; import java.util.List; import cn.zhang.crm.model.pojo.Employee; publicinterface EmployeeDao {     publicvoid add(Employee e);     public Employee getEmployee(int id);     public List getEmployees();     publicvoid update(Employee e);     publicvoid delete(int id); }

（c）实现DAO接口方法

实现EmployeeDao接口方法，同时要继承HibernateDaoSupport类，EmployeeDaoImpl.java的具体代码如下：

package cn.zhang.crm.dao.hibernate; import java.util.List; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; import cn.zhang.crm.dao.EmployeeDao; import cn.zhang.crm.model.pojo.Employee; public class EmployeeDaoImpl extends HibernateDaoSupport implements EmployeeDao {        public void add(Employee e) {               getHibernateTemplate().save(e);        }        public void delete(int id) {               getHibernateTemplate().delete(getEmployee(id));        }        public Employee getEmployee(int id) {               return (Employee)getHibernateTemplate().get(Employee.class, id);        }        public List getEmployees() {               //这里一定要写Employee，千万不要误写成employee，因为Hibernate是从对象中读取数据的               return getHibernateTemplate().find("from Employee");        }        public void update(Employee e) {               getHibernateTemplate().update(e);        } }

（d）service（或business）Manager服务层，主要是事务处理，利用的是代码生成技术（具体作用是什么现在还不是很清楚，在今后的学习中再好好的体会）

EmployeeManager.java（它是一个接口）代码如下：

package cn.zhang.crm.service; import java.util.List; import cn.zhang.crm.model.pojo.Employee; publicinterface EmployeeManager {     publicvoid addEmployee(Employee e);     public Employee getEmployee(int id);     public List listEmployee();     publicvoid updateEmployee(Employee e);     publicvoid deleteEmployee(int id); }

实现这个接口EmployeeManagerImpl.java：

package cn.zhang.crm.service.impl; import java.util.List; import cn.zhang.crm.dao.EmployeeDao; import cn.zhang.crm.model.pojo.Employee; import cn.zhang.crm.service.EmployeeManager; publicclass EmployeeManagerImpl implements EmployeeManager {     private EmployeeDao employeeDao;         publicvoid setEmployeeDao(EmployeeDao employeeDao) {        this.employeeDao = employeeDao;     }     publicvoid addEmployee(Employee e) {        employeeDao.add(e);     }     publicvoid deleteEmployee(int id) {        employeeDao.delete(id);     }     public Employee getEmployee(int id) {        returnemployeeDao.getEmployee(id);     }     public List listEmployee() {        returnemployeeDao.getEmployees();     }     publicvoid updateEmployee(Employee e) {        employeeDao.update(e);     } }

上述完成后，我们就需要在spring中注册类了。打开applicationContext.xml，然后注册<bean>

增加的代码如下：

<bean id="employeeDao"        class="cn.zhang.crm.dao.hibernate.EmployeeDaoHibernate">        <property name="sessionFactory">            <ref bean="sessionFactory" />        </property>     </bean>         <bean id="employeeManager"        class="cn.zhang.crm.service.impl.EmployeeManagerImpl">        <property name="employeeDao">            <ref bean="employeeDao" />        </property>     </bean>

到此完成了Spring和Hibernate的整合。