intellij idea 构建 基于spring springmvc hibernate的maven项目《二》

这里取名叫java，然后选中java文件夹，mark as  sources   在右侧可以看到已经标志为sources了。

完成后可以看到，工程下main已经多了一个名为java的文件夹，在java文件夹中创建包名，采用mvc 的方式命名

com.xxx.test.model  com.xxx.test.dao  com.xxx.test.daoImpl  com.xxx.test.service  com.xxx.test.controller  

下面开始连接数据库

在右侧点开database

新建mysql连接，并填入相应的信息，apply

连接成功后会在屏幕右侧看到数据库的具体信息

此时说明数据库已经连接成功，接下来根据数据库表格信息生成model信息

在页面左侧会出现persistence页面如果左侧没有persistence窗口，可以通过菜单栏View -》tool windows 打开persistence。（如果还没有则在projectstructure里面module添加jpa）打开后可以看到已经连接的数据库信息，选择数据库右键 Generate Persistence Mapping > By Database Schema.

如上图所示，选择数据库表，生成映射model类（指定包名），红色标注部分，可以根据自己的需要选择生成单个的.hbm映射文件还是通过注解的方式映射（效果都一样），我这儿选择的通过注解的方式映射。

完成后页面如下，model自动生成了

接下来就是为model写相应的dao层接口及实现：

1）将所有model的dao层进行统一封装，得到基类

2）每个model的dao继承基类

具体代码如下（忘了何人做的封装类了）：

接口IBaseDao

package com.htdz.dao;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
import com.htdz.model.Page;
import com.htdz.util.Parameter;
import org.hibernate.HibernateException;
public interface IBaseDao<T> {

   //单个CRUD
   public void save(final T entity) throws Exception;
   public void delete(final T entity) throws Exception;
    public void deleteWithHql(final String hql) throws Exception;
   public void update(final T entity) throws Exception;
   public T getOne(final int id) throws Exception;

    //批处理
    public int batchSave(final List<T> list) throws Exception;
    public void deleteAll(final Collection entities) throws Exception;//删不掉？

   //createQuery（Query）
   public T findOne(final String hql) throws Exception;
   public T findOne(final String hql, final Parameter parameter) throws Exception;
   
   //list查询
   public List<T> findList(final String hql) throws Exception;
   public List<T> findList(final String hql, final Parameter parameter) throws Exception;
   
   //分页查询
   public Page<T> findPage(final int currentPage, final int pageSize, final String queryHql, final String countHql, final Object[] values)
         throws HibernateException,SQLException;
   public Page<T> findPage(final int currentPage, final int pageSize, final String queryHql, final String countHql)
         throws HibernateException,SQLException;
   
   //查询满足条件的记录数
   public long findCount(final String hql);
   public long findCount(final String hql, final Object[] values);
}

实现类BaseDaoImpl

package com.htdz.daoImpl;

import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
import java.util.Set;

import javax.annotation.Resource;

import com.htdz.dao.IBaseDao;
import com.htdz.model.Page;
import com.htdz.util.Parameter;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

public class BaseDaoImpl<T> implements IBaseDao<T> {

    private int BATCH_MAX_ROW = 5;

   private SessionFactory sessionFactory;
   //使用spring配合hibernateTemplate来管理Transaction（结果不理想）
   //@Autowired   //干脆不用hibernateTemplate来操作了，事务处理时遇到太多问题
   //private HibernateTemplate hibernateTemplate;
   private Class<T> entityClass;
   
   //construct methods
   public BaseDaoImpl(){
}

    public BaseDaoImpl(Class<T> entityClass){
        this.entityClass = entityClass;
    }


    @Override
    public void save(T entity) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        session.save(entity);
        session.getTransaction().commit();
    }

    @Override
    public int batchSave(List<T> list) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        for (int i = 0; i < list.size(); ++i) {
            session.save(list.get(i));
            if (i % BATCH_MAX_ROW == 0) {
                session.flush();
                session.clear();
            }
        }
        session.flush();
        session.clear();
        session.getTransaction().commit();
        return list.size();
    }

    @Override
    public void deleteAll(Collection entities) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        for (Object entity : entities) {
            session.delete(entity);
        }
        session.getTransaction().commit();
    }

    @Override
    public void delete(T entity) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        session.delete(entity);
        session.getTransaction().commit();
    }

    @Override
    public void deleteWithHql(String hql) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        Query query = session.createQuery(hql);
        query.executeUpdate();
        session.getTransaction().commit();
    }

    @Override
    public void update(T entity) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        session.update(entity);
        session.getTransaction().commit();
    }

    @SuppressWarnings("unchecked")
    @Override
    public T getOne(int id) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        Object returnObject = session.get(entityClass, id);
        session.getTransaction().commit();

        return (T) returnObject;
    }

    @Override
    public T findOne(String hql) throws Exception {
        return findOne(hql,null);
    }

    @SuppressWarnings("unchecked")
    @Override
    public T findOne(final String hql, final Parameter parameter) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        Query query = session.createQuery(hql);
        setParameter(query, parameter);
        Object returnObject = query.setMaxResults(1).uniqueResult();
        session.getTransaction().commit();

        return (T) returnObject;
    }

    @Override
    public List<T> findList(final String hql) throws Exception {
        return findList(hql, null);
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<T> findList(final String hql, final Parameter parameter) throws Exception {
        Session session = this.getSession();
        session.beginTransaction();
        Query query = session.createQuery(hql);
        setParameter(query, parameter);
        List<T> returnList = query.list();
        session.getTransaction().commit();

        return returnList;
    }

    /**
     *
     * @param query
     * @param parameter
     * set sql parameters
     */
    private void setParameter(Query query, Parameter parameter) {
        if (parameter != null) {
            Set<String> keySet = parameter.keySet();
            for (String string : keySet) {
                Object value = parameter.get(string);
                if (value instanceof Collection<?>) {
                    query.setParameterList(string, (Collection<?>) value);
                } else if (value instanceof Object[]) {
                    query.setParameterList(string, (Object[]) value);
                } else {
                    query.setParameter(string, value);
                }
            }
        }
    }

    public SessionFactory getSessionFactory() {
      return sessionFactory;
   }

   @Resource(name="sessionFactory")//在applicationContext.xml文件中有配置
   public void setSessionFactory(SessionFactory sessionFactory) {
      this.sessionFactory = sessionFactory;
   }

    /**
     * @return session
     */
    private Session getSession() {
        return sessionFactory.getCurrentSession();
      /*  Configuration config = new Configuration().configure("applicationContext.xml");
        sessionFactory = config.buildSessionFactory();
        return sessionFactory.openSession();*/
    }

   @SuppressWarnings("unchecked")
   @Override
   public Page<T> findPage(int currentPage, int pageSize, String queryHql, String countHql, Object[] values)
         throws HibernateException, SQLException {
      Session session = this.getSession();
      session.beginTransaction();
      Query query = session.createQuery(queryHql);
        if (values != null) {
            for (int i = 0; i < values.length; i++) {
                query.setParameter(i, values[i]);
            }
        }
        // 如果pageSize<=0则查询全部，用于打印导出等...
        if (pageSize > 0) {
            query.setFirstResult(pageSize * (currentPage - 1));//设置要查询的结果集的开始索引位置
            query.setMaxResults(pageSize);//设置要查询的结果集的数量
        }
        List<T> returnList = query.list();
        session.getTransaction().commit();
        long totalRecords = findCount(countHql, values);
        
        return new Page<T>(returnList, totalRecords, currentPage, pageSize);
   }

   @Override
   public Page<T> findPage(int currentPage, int pageSize, String queryHql, String countHql)
         throws HibernateException, SQLException {
      return findPage(currentPage, pageSize, queryHql, countHql, null);
   }

   @Override
   public long findCount(String hql) {
      return findCount(hql, null);
   }

   @Override
   public long findCount(String hql, Object[] values) {
      Session session = this.getSession();
      session.beginTransaction();
      Query query = session.createQuery(hql);
        if (values != null) {
            for (int i = 0; i < values.length; i++) {
                query.setParameter(i, values[i]);
            }
        }
        Long returnLong = (Long) query.setMaxResults(1).uniqueResult();
        session.getTransaction().commit();
        
        return returnLong;
   }
   
}

辅助类Page

package com.xxxx.test.dao;

import java.util.List;

public class Page<T> {

    private int current = 1;
    private int total = 0;
    private long records = 0;
    private int size = 10;
    private String orderBy = "";
    private String order = "";

    public String getOrderBy() {
        return orderBy;
    }

    public void setOrderBy(String orderBy) {
        this.orderBy = orderBy;
    }

    public String getOrder() {
        return order;
    }

    public void setOrder(String order) {
        this.order = order;
    }

    private List<T> list = null;

    public Page() {

    }

    public Page(int currentPage, int pageSize){
       current=currentPage;
       size=pageSize;
   }

    public Page(List<T> list, int current, int size) {
        this.current = current;
        this.size = size;
        this.list = list;
    }
    
    public Page(List<T> list, long records, int current, int size, String orderBy, String order) {
        this.list = list;
        this.current = current;
        this.records = records;
        this.size = size;
        this.orderBy = orderBy;
        this.order = order;
        this.total = records == 0 ? 1 : (int) ((records - 1) / size + 1);//分几页的计算方法

        if (this.current > this.total) {
            this.current = this.total;
        }
        if (current < 1) {
            this.current = 1;
        }
    }

    public Page(List<T> list, long records, int current, int size) {
        this(list, records, current, size, null, null);
    }

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        this.current = current;
    }

    public int getSize() {
        return size;
    }

    public void setSize(int size) {
        this.size = size;
    }

    public int getTotal() {
        return total;
    }

    public void setTotal(int l) {
        this.total = l;
    }

    public long getRecords() {
        return records;
    }

    public void setRecords(long records) {
        this.records = records;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

    @Override
    public String toString() {
        return "Page{" +
                "current=" + current +
                ", size=" + size +
                ", list=" + list +
                '}';
    }
}

辅助类 Parameter

package com.xxxx.test.dao;



import java.util.HashMap;

/**
 * 查询参数类
 *
 */
public class Parameter extends HashMap<String, Object> {

    private static final long serialVersionUID = 1L;

    /**
     * 构造类，例：new Parameter(id, parentIds)
     *
     * @param values 参数值
     */
    public Parameter(Object... values) {
        if (values != null) {
            for (int i = 0; i < values.length; i++) {
                put("p" + i, values[i]);
            }
        }
    }

    /**
     * 构造类，例：new Parameter(new Object[][]{{"id", id}, {"parentIds", parentIds}})
     *
     * @param parameters 参数二维数组
     */
    public Parameter(Object[][] parameters) {
        if (parameters != null) {
            for (Object[] os : parameters) {
                if (os.length == 2) {
                    put((String) os[0], os[1]);
                }
            }
        }
    }

}

UserDao

package com.xxxx.test.dao;

import com.xxxx.test.model.UserEntity;/** * Created by yab on 2017/7/6. */public interface UserDao extends IBaseDao<BBasic> {}UserDaoImpl

package com.xxxx.test.dao;

import com.xxxx.test.dao.UserDao;
import com.xxxx.test.model.UserEntity;

import org.springframework.stereotype.Component;

/**
 * Created by yab on 2017/7/6.
 */
@Component
public class UserDaoImpl extends BaseDaoImpl<UserEntity> implements UserDao {

    public UserDaoImpl(){
        super(UserEntity.class);
    }

}

基本工作完成了，下面就是写service层和controller层函数了