[Spring+Hibernate系列]2.项目介绍与首个MVC实例

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1. 项目介绍

简单起见：项目背景定义为一个学生成绩查询系统。
涉及到的实体类：
学生
老师
课程
学生课程成绩（关系表）

涉及到的操作：
学生信息查询、增加、修改、删除
老师信息查询、增加、修改、删除
老师信息查询、增加、修改、删除
学生课程成绩的查询、增加、修改、删除

2. 系统设计

1）这里仅实现一个添加Student 的简单功能，达成使框架可以运行起来的目的。
代码部分有
前端：一个输入Student 的页面
后端：处理输入信息并在数据库添加一笔Student 信息

2）系统简单，只拆分为基本的共用模块和工作模块两部分。
每个模块的目录按照
model, controller,dao, service 四个
具体里面放什么，一目了然了

3）数据库映射
这里使用JPA注解实现类和Db table 的映射，不需要额外定义xml。

3. 系统实现

1) 前端页面. student_input.jsp
放置于 WebContent 下

内容尽量简化:(path 变量实际可以取变量替换)

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%String path = "http://localhost:8080/springHibernateDemo/";%><html><head></head><body><form  name="form" method="post"action="http://localhost:8080/springHibernateDemo/work/studentController/save">ID: <input type="text" name="studentId"  value=""/><br>English Name:<input type="text" name="engName"  value=""/><br>Chinese Name:<input type="text" name="chiName"  value=""/><br>Gender:<input type="text" name="gender"  value=""/><br>Age:<input type="text" name="age"  value=""/><br><input type="submit" value="Add"/></form></body></html>

2）后端代码
基本模组代码结构：

BaseController.java (目前是空的)

package com.oscar999.base.controller;public abstract class BaseController<T> {}

BaseDao.java

package com.oscar999.base.dao;import java.io.Serializable;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import java.util.Collection;import java.util.List;import java.util.Map;import javax.annotation.Resource;import org.apache.log4j.Logger;import org.hibernate.HibernateException;import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.springframework.orm.hibernate4.HibernateCallback;import org.springframework.orm.hibernate4.support.HibernateDaoSupport;import org.springframework.transaction.annotation.Transactional;import org.springframework.util.CollectionUtils;@Transactionalpublic abstract class BaseDao<E, PK extends Serializable> extends HibernateDaoSupport {protected Logger log = Logger.getLogger(getEntityClass());protected Class<E> entityClass;protected Session session;@Resourcepublic void setSuperSessionFactory(SessionFactory sessionFactory) {super.setSessionFactory(sessionFactory);}public E get(PK id) {return (E) super.getHibernateTemplate().get(getEntityClass(), id);}public void delete(PK id) {E obj = get(id);if (obj != null) {super.getHibernateTemplate().delete(obj);}}public void delete(E obj) {if (obj != null) {super.getHibernateTemplate().delete(obj);}}public void delete(Collection<E> obj) {if (obj != null && obj.size() > 0) {super.getHibernateTemplate().deleteAll(obj);}}@SuppressWarnings("rawtypes")public void deleteAll(List ids) {String hql = "delete from " + getEntityClass().getName() + " t where t.id in(:ids) ";getSessionFactory().openSession().createQuery(hql).setParameterList("ids", ids).executeUpdate();}public E update(E obj) {if (obj != null) {super.getHibernateTemplate().update(obj);}return obj;}public E save(E obj) {if (obj != null) {super.getHibernateTemplate().save(obj);}return obj;}public E saveOrUpdate(E obj) {if (obj != null) {super.getHibernateTemplate().saveOrUpdate(obj);}return obj;}@SuppressWarnings({ "unchecked", "rawtypes" })public void executeUpdateHQl(final String hql, final Map map) {super.getHibernateTemplate().execute(new HibernateCallback() {public Integer doInHibernate(Session session) throws HibernateException {Query query = session.createQuery(hql);query.setProperties(map);return query.executeUpdate();}});}@SuppressWarnings({ "unchecked", "rawtypes" })public E getEntity(final String hql, final Map map) {List<E> list = (List<E>) super.getHibernateTemplate().execute(new HibernateCallback() {public List<E> doInHibernate(Session session) throws HibernateException {Query query = session.createQuery(hql);query.setProperties(map);return query.list();}});if (!CollectionUtils.isEmpty(list)) {return (E) list.get(0);}return null;}@SuppressWarnings({ "unchecked", "rawtypes" })public E getEntity(final String hql, final E entity) {List<E> list = (List<E>) super.getHibernateTemplate().execute(new HibernateCallback() {public List<E> doInHibernate(Session session) throws HibernateException {Query query = session.createQuery(hql);query.setProperties(entity);return query.list();}});if (!CollectionUtils.isEmpty(list)) {return (E) list.get(0);}return null;}@SuppressWarnings({ "unchecked", "rawtypes" })public List<E> getHqlResultList(final String hql, final Map map) {List<E> list = (List<E>) super.getHibernateTemplate().execute(new HibernateCallback() {public List<E> doInHibernate(Session session) throws HibernateException {Query query = session.createQuery(hql);query.setProperties(map);return query.list();}});return list;}@SuppressWarnings({ "unchecked", "rawtypes" })public List<E> getHqlResultList(final String hql, final E entity) {List<E> list = (List<E>) super.getHibernateTemplate().execute(new HibernateCallback() {public List<E> doInHibernate(Session session) throws HibernateException {Query query = session.createQuery(hql);query.setProperties(entity);return query.list();}});return list;}/** * @return the entityClass */@SuppressWarnings("unchecked")public Class<E> getEntityClass() {entityClass = (Class<E>) getSuperClassGenricType(getClass(), 0);return entityClass;}/** * @param entityClass *            the entityClass to set */public void setEntityClass(Class<E> entityClass) {this.entityClass = entityClass;}/** *  *  * @param clazz *            clazz The class to introspect * @param index *            the Index of the generic ddeclaration,start from 0. * @return the index generic declaration, or Object.class if cannot be *         determined */@SuppressWarnings({ "rawtypes", "unchecked" })private Class<Object> getSuperClassGenricType(Class clazz, int index) {Type genType = clazz.getGenericSuperclass();if (!(genType instanceof ParameterizedType)) {return Object.class;}Type[] params = ((ParameterizedType) genType).getActualTypeArguments();if (index >= params.length || index < 0) {return Object.class;}if (!(params[index] instanceof Class)) {return Object.class;}return (Class) params[index];}}

BaseEntity.java

package com.oscar999.base.model;import java.io.Serializable;public class BaseEntity  implements Serializable{/** *  */private static final long serialVersionUID = 1L;}

BaseService.java

package com.oscar999.base.service;public interface BaseService<T, K> {public T saveEntity(T t);}

BaseServiceImpl.java

package com.oscar999.base.service.impl;import java.io.Serializable;import org.springframework.transaction.annotation.Transactional;import com.oscar999.base.dao.BaseDao;import com.oscar999.base.service.BaseService;public abstract class BaseServiceImpl<T,K extends Serializable> implements BaseService<T, K> {@Override@Transactionalpublic T saveEntity(T t) {if(null==getDao()){return null;}return getDao().saveOrUpdate(t);}/** * @return the dao */public abstract BaseDao<T, K> getDao() ;}

work 目录和代码

StudentController.java

package com.oscar999.work.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import com.oscar999.base.controller.BaseController;import com.oscar999.work.model.Student;import com.oscar999.work.service.StudentService;@Controller@RequestMapping("/work/studentController")public class StudentController  extends BaseController<Student>{@Autowiredprivate StudentService studentService;@RequestMapping(value="/save", method = RequestMethod.POST)public String save(ModelMap model,Student student){studentService.saveEntity(student);return "";}}

StudentDao.java

package com.oscar999.work.dao;import org.springframework.stereotype.Repository;import  com.oscar999.base.dao.*;import com.oscar999.work.model.Student;@Repositorypublic class StudentDao extends BaseDao<Student,Integer>{}

Student.java

package com.oscar999.work.model;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;import com.oscar999.base.model.BaseEntity;@Entity@SequenceGenerator(name = "SEQ_STUDENT", allocationSize = 1, initialValue = 1, sequenceName = "SEQ_STUDENT")@Table(name = "STUDENT")public class Student extends BaseEntity {/** *  */private static final long serialVersionUID = 1L;@Id@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEQ_STUDENT")@Column(name = "ID")protected Integer id;@Column(name = "STUDENTID", nullable = false)private String studentId;@Column(name = "ENGNAME", nullable = false)private String engName;@Column(name = "CHINAME", nullable = false)private String chiName;@Column(name = "GENDER", nullable = false)private String gender;@Column(name = "AGE")private String age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getStudentId() {return studentId;}public void setStudentId(String studentId) {this.studentId = studentId;}public String getEngName() {return engName;}public void setEngName(String engName) {this.engName = engName;}public String getChiName() {return chiName;}public void setChiName(String chiName) {this.chiName = chiName;}public String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}public String getAge() {return age;}public void setAge(String age) {this.age = age;}}

StudentService.java

package com.oscar999.work.service;import com.oscar999.base.service.BaseService;import com.oscar999.work.model.Student;public interface StudentService extends BaseService<Student, Integer>{}

StudentServiceImpl.java

package com.oscar999.work.service.impl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import com.oscar999.base.dao.BaseDao;import com.oscar999.base.service.impl.BaseServiceImpl;import com.oscar999.work.model.Student;import com.oscar999.work.service.StudentService;import com.oscar999.work.dao.StudentDao;@Servicepublic class StudentServiceImpl extends BaseServiceImpl<Student, Integer> implements StudentService {@Autowiredprivate StudentDao dao;@Overridepublic BaseDao<Student, Integer> getDao() {// TODO Auto-generated method stubreturn dao;}@Override@Transactionalpublic Student saveEntity(Student student){return dao.save(student);}}

以上所有部分完成，在eclipse 中打包成war 档后拷入到 tomcat 的webapps 中，即可。

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