Struts2、Hibernate、Spring整合的泛型DAO,以及通用的分页技术 二

3.具体的DAO接口


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package abu.csdn.dao;   
import abu.csdn.bean.User;   
/**
*
* @author Abu
*
*/  
public interface UserDao extends GenericDao<User, Long> {   
    /**
      * <p>
      * 根据用户名精确查找
      * </p>
      * @param uname : 用户名
      * @return : 匹配的实体
      */  
    public User findByNameExact(String uname);   
}  
package abu.csdn.dao; import abu.csdn.bean.User; /** * * @author Abu * */ public interface UserDao extends GenericDao<User, Long> { /** * <p> * 根据用户名精确查找 * </p> * @param uname : 用户名 * @return : 匹配的实体 */ public User findByNameExact(String uname); }

4.具体DAO接口的实现


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package abu.csdn.dao.impl;   
import java.util.List;   
import abu.csdn.bean.User;   
import abu.csdn.dao.UserDao;   
/**
*
* @author Abu
*
*/  
public class UserDaoImpl extends GenericDaoImpl<User, Long> implements UserDao {   
    public UserDaoImpl(Class<User> type) {   
        super(type);   
     }   
    @SuppressWarnings("unchecked")   
    public User findByNameExact(String uname) {   
         List<User> list = (List<User>) this.getHibernateTemplate().find(   
                "from User u where u.uname = ?", uname).get(0);   
        return (!list.isEmpty() && list.size() == 1) ? null : list.get(0);          
     }   
}  
package abu.csdn.dao.impl; import java.util.List; import abu.csdn.bean.User; import abu.csdn.dao.UserDao; /** * * @author Abu * */ public class UserDaoImpl extends GenericDaoImpl<User, Long> implements UserDao { public UserDaoImpl(Class<User> type) { super(type); } @SuppressWarnings("unchecked") public User findByNameExact(String uname) { List<User> list = (List<User>) this.getHibernateTemplate().find( "from User u where u.uname = ?", uname).get(0); return (!list.isEmpty() && list.size() == 1) ? null : list.get(0); } }

5.基本泛型服务接口


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package abu.csdn.service;   
import java.io.Serializable;   
import java.util.Collection;   
import java.util.List;   
/**
* <p>
* 基本上与泛型DAO的通用接口一致,请参见GenericDao
* <p>
*
* @author Abu
*
* @param <T> :
*             持久化的实体Bean
* @param <ID> :
*             实体Bean的id
*/  
public interface GenericService<T, ID extends Serializable> {   
    /**
      * 保存实体
      *
      * @param entity :
      *             实体
      * @return 保存后得到的id
      */  
    public ID save(T entity);   
    /**
      * <p>
      * 删除实体
      * </p>
      *
      * @param entity :
      *             实体
      */  
    public void remove(T entity);   
       
       
    /**
      * <p>
      * 删除实体集合
      * </p>
      *
      * @param entities :
      *             实体
      */  
    public void removeAll(Collection<T> entities);   
    /**
      * <p>
      * 修改实体
      * </p>
      *
      * @param entity :
      *             实体
      */  
    public void modify(T entity);   
    /**
      * <p>
      * 通过名字查找
      * </p>
      *
      * @param id :
      *             id
      * @return 找到的实体
      */  
    public T findById(ID id);   
    /**
      * <p>
      * 查找全部实体
      * <p>
      *
      * @return 所有实体的列表
      */  
    public List<T> findAll();   
    /**
      * <p>
      * 根据给定的hql语句进行分页查找
      * <p>
      *
      * @param page :
      *             要查询的页码
      * @param size :
      *             每页记录条数
      * @return 匹配的实体列表
      */  
    public List<T> findByPage(final int page, final int size);   
    /**
      * <p>
      * 计算匹配查询条件的记录总数,如果没有注入或者设置hql语句,将使用默认的查询语句返回数据库中所有记录
      * </p>
      *
      * @return 记录总数
      */  
    public int getTotalRows();   
    /**
      * <p>
      * 根据每页记录的数量,计算出总的分页数
      * </p>
      *
      * @param size
      *             每页记录的数量
      * @return 分页总数
      */  
    public int getPageSize(int size);   
}  


6.基本泛型服务接口的实现


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package abu.csdn.service.impl;   
import java.io.Serializable;   
import java.util.Collection;   
import java.util.List;   
import abu.csdn.dao.GenericDao;   
import abu.csdn.service.GenericService;   
/**
*
* @author Abu
*
* @param <T>
* @param <ID>
*/  
public class GenericServiceImpl<T, ID extends Serializable> implements  
         GenericService<T, ID> {   
    private GenericDao<T,ID> genericDao;   
       
    public List<T> findAll() {           
        return genericDao.findAll();   
     }   
    public T findById(ID id) {         
        return genericDao.findById(id);   
     }   
    public List<T> findByPage(int page, int size) {          
        return genericDao.findByPage(page, size);   
     }   
    public int getPageSize(int size) {         
        return genericDao.getPageSize(size);   
     }   
    public int getTotalRows() {        
        return genericDao.getTotalRows();   
     }   
    public void modify(T entity) {   
         genericDao.modify(entity);         
     }   
    public void remove(T entity) {   
         genericDao.remove(entity);   
     }   
    public void removeAll(Collection<T> entities) {   
         genericDao.removeAll(entities);        
     }   
       
    public ID save(T entity) {         
        return genericDao.save(entity);   
     }   
    public void setGenericDao(GenericDao<T, ID> genericDao) {   
        this.genericDao = genericDao;   
     }      
}  
package abu.csdn.service.impl; import java.io.Serializable; import java.util.Collection; import java.util.List; import abu.csdn.dao.GenericDao; import abu.csdn.service.GenericService; /** * * @author Abu * * @param <T> * @param <ID> */ public class GenericServiceImpl<T, ID extends Serializable> implements GenericService<T, ID> { private GenericDao<T,ID> genericDao; public List<T> findAll() { return genericDao.findAll(); } public T findById(ID id) { return genericDao.findById(id); } public List<T> findByPage(int page, int size) { return genericDao.findByPage(page, size); } public int getPageSize(int size) { return genericDao.getPageSize(size); } public int getTotalRows() { return genericDao.getTotalRows(); } public void modify(T entity) { genericDao.modify(entity); } public void remove(T entity) { genericDao.remove(entity); } public void removeAll(Collection<T> entities) { genericDao.removeAll(entities); } public ID save(T entity) { return genericDao.save(entity); } public void setGenericDao(GenericDao<T, ID> genericDao) { this.genericDao = genericDao; } }

7.具体的服务接口


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package abu.csdn.service;   
import abu.csdn.bean.User;   
/**
*
* @author Abu
*
*/  
public interface UserService extends GenericService<User, Long> {   
    /**
      * <p>
      * 用户登录验证, 登录成功将返回该用户实体,失败则为空
      * </p>
      *
      * @param uname :
      *             用户名
      * @param upass :
      *             密码
      * @return 用户实体
      */  
    public User login(String uname, String upass);   
       
    public void removeByUids(long [] uids);   
}  
package abu.csdn.service; import abu.csdn.bean.User; /** * * @author Abu * */ public interface UserService extends GenericService<User, Long> { /** * <p> * 用户登录验证, 登录成功将返回该用户实体,失败则为空 * </p> * * @param uname : * 用户名 * @param upass : * 密码 * @return 用户实体 */ public User login(String uname, String upass); public void removeByUids(long [] uids); }

8.具体的服务接口的实现


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package abu.csdn.service.impl;   
import java.util.Collection;   
import java.util.List;   
import abu.csdn.bean.User;   
import abu.csdn.dao.UserDao;   
import abu.csdn.dao.impl.UserDaoImpl;   
import abu.csdn.service.UserService;   
/**
*
* @author Abu
*
*/  
public class UserServiceImpl implements UserService {   
    private UserDao userDao;   
    public void setUserDao(UserDao userDao) {   
        this.userDao = userDao;   
     }   
    public UserDao getUserDao() {   
        return this.userDao;   
     }   
    public List<User> findAll() {   
        return userDao.findAll();   
     }   
    public User findById(Long id) {   
        return userDao.findById(id);   
     }   
    public List<User> findByPage(int page, int size) {   
        return userDao.findByPage(page, size);   
     }   
    public int getPageSize(int size) {   
        return userDao.getPageSize(size);   
     }   
    public int getTotalRows() {   
        return userDao.getTotalRows();   
     }   
    public void modify(User entity) {   
         userDao.modify(entity);   
     }   
    public void removeAll(Collection<User> entities) {   
         userDao.removeAll(entities);   
     }   
    public void remove(User entity) {   
         userDao.remove(entity);   
     }   
    public Long save(User entity) {   
        return userDao.save(entity);   
     }   
    @SuppressWarnings("unchecked")   
    public User login(String uname, String upass) {   
         String hql = "from User u where u.uname = '" + uname + "'"  
                 + " and u.upass = '" + upass + "'";   
         userDao.setHql(hql);   
         List<User> list = userDao.findAll();   
         User user =   (list.isEmpty() && list.size() != 1) ? null : list.get(0);   
        // 千万要记住,一旦修改了默认值,则业务结束后要重新改回默认值   
         userDao.setHql(" from " + User.class.getName());   
           
        return   user;   
     }   
    public void removeByUids(long[] uids) {   
         StringBuffer hqlSb = new StringBuffer();   
         hqlSb.append(" from User u where u.uid in (");   
        for (int i = 0; i < uids.length; i++) {   
            if (i != uids.length - 1) {   
                 hqlSb.append(uids[i]).append(",");   
             } else {   
                 hqlSb.append(uids[i]);   
             }   
         }   
         hqlSb.append(")");   
         userDao.setHql(hqlSb.toString());   
         Collection<User> entities = userDao.findAll();   
        if (entities != null) {   
             userDao.removeAll(entities);   
         }   
     }   
}  
package abu.csdn.service.impl; import java.util.Collection; import java.util.List; import abu.csdn.bean.User; import abu.csdn.dao.UserDao; import abu.csdn.dao.impl.UserDaoImpl; import abu.csdn.service.UserService; /** * * @author Abu * */ public class UserServiceImpl implements UserService { private UserDao userDao; public void setUserDao(UserDao userDao) { this.userDao = userDao; } public UserDao getUserDao() { return this.userDao; } public List<User> findAll() { return userDao.findAll(); } public User findById(Long id) { return userDao.findById(id); } public List<User> findByPage(int page, int size) { return userDao.findByPage(page, size); } public int getPageSize(int size) { return userDao.getPageSize(size); } public int getTotalRows() { return userDao.getTotalRows(); } public void modify(User entity) { userDao.modify(entity); } public void removeAll(Collection<User> entities) { userDao.removeAll(entities); } public void remove(User entity) { userDao.remove(entity); } public Long save(User entity) { return userDao.save(entity); } @SuppressWarnings("unchecked") public User login(String uname, String upass) { String hql = "from User u where u.uname = '" + uname + "'" + " and u.upass = '" + upass + "'"; userDao.setHql(hql); List<User> list = userDao.findAll(); User user = (list.isEmpty() && list.size() != 1) ? null : list.get(0); // 千万要记住,一旦修改了默认值,则业务结束后要重新改回默认值 userDao.setHql(" from " + User.class.getName()); return user; } public void removeByUids(long[] uids) { StringBuffer hqlSb = new StringBuffer(); hqlSb.append(" from User u where u.uid in ("); for (int i = 0; i < uids.length; i++) { if (i != uids.length - 1) { hqlSb.append(uids[i]).append(","); } else { hqlSb.append(uids[i]); } } hqlSb.append(")"); userDao.setHql(hqlSb.toString()); Collection<User> entities = userDao.findAll(); if (entities != null) { userDao.removeAll(entities); } } }