Struts框架和Hibernate框架的整合完整版介绍

Struts框架和Hibernate框架的整合1、首先写一个student的实体类，命名为：StudentEntity.java package com.liu.student.entity;/*** 数据库表的映射实体类文件* @author Calasin*/public class StudentEntity {private String s_id;// 学号private String s_name;// 姓名private int s_age;// 年龄public String getS_id() {return s_id;}public void setS_id(String s_id) {this.s_id = s_id;}public String getS_name() {return s_name;}public void setS_name(String s_name) {this.s_name = s_name;}public int getS_age() {return s_age;}public void setS_age(int s_age) {this.s_age = s_age;}public String toString() {return"StudentEntity [s_id="+ s_id+ ", s_name="+ s_name + ", s_age=" + s_age + "]";}}2、接着写student实体类StudentEntity的配置文件：StudentEntity.hbm.xml<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN""/hibernate-mapping-3.0.dtd "><hibernate-mapping><!-- name属性:对应实体类的地址,table属性:对应数据库的表名称(对应数据库表是什么名字，这里就是写什么名字) --><class name="com.liu.student.entity.StudentEntity" table="student"><!-- name对应的是java，column对应的是数据库，但是一般两个都写成一样，这样可以避免出错name属性:主键id,对应的是java中的类中的属性,column属性:对应数据库中的主键id --><id name="s_id"column="s_id"><!-- 主键生成策略:uuid 32位随机的字符串 --><generator class="uuid"></generator></id><!-- name属性:对应java中的实体类属性,column属性:对应的数据库中的字段名称,type属性:表示java中的数据类型,默认可以不添加 --> <property name="s_name"column="s_name" type="ng.String"></property><property name="s_age"column="s_age"></property> </class></hibernate-mapping>3、接下来写实体类的Action：StudentActionpackage com.liu.student.action;import java.util.List;import com.liu.student.entity.StudentEntity;import com.liu.student.service.StudentService;import com.liu.student.service.StudentServiceImpl;import com.opensymphony.xwork2.ActionSupport;/*** 与jsp页面交互,完成数据传递* @author Calasin*/public class StudentAction extends ActionSupport { private List studentList;//创建一个List类型的学生列表private StudentService studentService= new StudentServiceImpl();private StudentEntity studentEntity;/*** 查询学生表的列表信息** @return*/public String studentList() {studentList = studentService.getStudentList();return"studentList";}public String updPage() {studentEntity = studentService.getStudentEntity(studentEntity.getS_id());return"updPage";}public String upd() {studentService.update(studentEntity);return"upd";}public List getStudentList() {return studentList;}public void setStudentList(List studentList) {this.studentList = studentList;}public StudentEntity getStudentEntity() {return studentEntity;}public void setStudentEntity(StudentEntity studentEntity) { this.studentEntity = studentEntity;}}4、接下来写提供数据库的接口interface: Dao.javapackage com.liu.dao;import java.util.List;/*** 提供数据库接口* @author Calasin*1．总体设计：设计Student对象及相关实体配置文件，工具类（得到一个Session对象），* StudentDao接口（实现此接口即以操作数据库）,下面代码用"Dao"代替，编写主配置文件，编写测试类。

*2．StudentDao的设计，最初打算设计成通用Object的操作，* 后来发现它的Session对象操作都要传递一个对象，就设计成如下形式。

内容如下：*/public interface Dao {public List getList(String hql);//查看学生的列表信息public void add(Object obj);//增加public void update(Object obj);//修改public void delete(Object obj);//删除public Object getObj(Class cls, String id);//获取单一实体类对象}5、接下来写接口实现类的具体操作方法DaoImpl,实现Dao接口package com.liu.dao;import java.util.List;import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;/*** Dao接口实现类,具体的操作,主要工作由Hibernate来完成* 以下几点需要注意：导包：Hibernate包，数据库包；改写配置文件；查询方法的设计；注意事务，特别是“增删改”要注意事务。

* @author Calasin*/public class DaoImpl implements Dao {private Session session;public DaoImpl() {// 提供一个空参构造// 首先构建一个Configuration对象，可以调用configure()方法Configuration cfg = new Configuration().configure();// 再用这个对象构建一个SessionFactory对象，才是真正意义上可操控的实例对象SessionFactory sessionFactory = cfg.buildSessionFactory();// 然后在用这个对象来构建一个SessionFactory对象session = sessionFactory.openSession();}// 增加public void add(Object obj) {// TODO Auto-generated method stub}// 删除public void delete(Object obj) {// TODO Auto-generated method stub}/*** 查询列表方法(通用查询)*/public List getList(String hql) {// TODO Auto-generated method stubtry {session.beginTransaction();// 开启事务Query query = session.createQuery(hql);List list = query.list();session.getTransaction().commit();// 提交return list;} catch (Exception e) {// TODO: handle exceptionreturn null;} finally {session.close();}}/*** 获取单一实体类对象*/public Object getObj(Class cls, String id) { try {session.beginTransaction();Object object = session.get(cls, id);session.getTransaction().commit();return object;} catch (Exception e) {// TODO: handle exceptionreturn null;} finally {session.close();}}/*** 修改单一实体类对象*/public void update(Object obj) {// TODO Auto-generated method stubtry {session.beginTransaction();session.update(obj);session.getTransaction().commit();} catch (Exception e) {// TODO: handle exception} finally {session.close();}}}6、接下来写service层：StudentServicepackage com.liu.student.service;import java.util.List;import com.liu.student.entity.StudentEntity;public interface StudentService {public List getStudentList();//查public void add (StudentEntity studentEntity);//增public void update(StudentEntity studentEntity);//改public void delete(StudentEntity studentEntity);//删public StudentEntity getStudentEntity(String s_id);}7、接下来写service层：StudentServiceImplpackage com.liu.student.service;import java.util.List;import com.liu.dao.Dao;import com.liu.dao.DaoImpl;import com.liu.student.entity.StudentEntity;/*** 针对数据库中student表的操作** @author Calasin**/public class StudentServiceImpl implements StudentService { private Dao dao = new DaoImpl();public void add(StudentEntity studentEntity) {// TODO Auto-generated method stub}public void delete(StudentEntity studentEntity) {// TODO Auto-generated method stub}public StudentEntity getStudentEntity(String s_id) { // TODO Auto-generated method stubStudentEntity studentEntity = (StudentEntity) dao.getObj( StudentEntity.class, s_id);return studentEntity;}public List getStudentList() {// TODO Auto-generated method stubString hql = "from StudentEntity";List list = dao.getList(hql);return list;}public void update(StudentEntity studentEntity) {// TODO Auto-generated method stubdao.update(studentEntity);}}8、配置文件config介绍（hibernate.cfg.xml和struts.xml）Hibernate.cfg.xml介绍如下：<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""/hibernate-configuration-3 .0.dtd"><hibernate-configuration><session-factory><propertyname="hibernate.connection.url">jdbc:mysql://localhost:3306/te st?characterEncoding=utf-8</property><propertyname="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><propertyname="ername">root</property><propertyname="hibernate.connection.password">123456</property><!-- 数据库方言 --><propertyname="hibernate.dialect">org.hibernate.dialect.MySQLDialect</p roperty><property name="hibernate.show_sql">true</property><mappingresource="com/liu/student/entity/StudentEntity.hbm.xml"/> </session-factory></hibernate-configuration>Struts.xml介绍如下：<?xml version="1.0"encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""/dtds/struts-2.0.dtd"><struts><constant name="struts.devMode"value="true"/><constant name="struts.enable.DynamicMethodInvocation" value="true"/><package name="stu"extends="struts-default"><action name="stu" class="com.liu.student.action.StudentAction"><resultname="studentList">/jsp/student/list.jsp</result><result name="updPage">/jsp/student/upd.jsp</result><result name="upd" type="redirect">stu!studentList.action</result></action></package></struts>。