1 package com.demo.service;
 2
 3 import java.util.List;
 4
 5 import com.demo.model.User;
 6
 7 public interface UserService {
 8     /**
 9      * 添加用户
10      * @param user
11      * @return
12      */
13     public boolean add(User user);
14
15     /**
16      * 修改用户
17      * @param user
18      * @return
19      */
20     public boolean update(User user);
21
22     /**
23      * 删除用户
24      * @param user
25      * @return
26      */
27     public boolean delete(User user);
28
29     /**
30      * 根据id获取用户
31      * @param obj
32      * @param id
33      * @return
34      */
35     public User getById(Class obj,int id);
36
37     /**
38      * 统计符合一定条件用户的数量
39      * @param hql
40      * @param param
41      * @return
42      */
43     public int getCount(String hql,String[] param);
44
45     /**
46      * 查询符合一定条件的用户
47      * @param hql
48      * @param param
49      * @return
50      */
51     public List<User> query(String hql,String[] param);
52
53 }

package com.demo.service;import java.util.List;import com.demo.dao.BaseDAO;
import com.demo.model.User;public class UserServiceImpl implements UserService {private BaseDAO dao = new BaseDAO();@Overridepublic boolean add(User user) {boolean flag = false;flag = dao.add(user);return flag;}@Overridepublic boolean delete(User user) {boolean flag = false;flag = dao.delete(user);return flag;}@Overridepublic User getById(Class obj, int id) {User u = (User)dao.get(User.class, id);return u;}@Overridepublic int getCount(String hql, String[] param) {int cnt = 0;cnt = dao.getCount(hql, param);return cnt;}@Overridepublic List<User> query(String hql, String[] param) {List<User> list = dao.query(hql, param);return list;}@Overridepublic boolean update(User user) {boolean flag = false;flag = dao.update(user);return flag;}}

package com.demo.test;import com.demo.model.User;
import com.demo.service.UserService;
import com.demo.service.UserServiceImpl;public class TestUserService {public static void main(String[] args) {UserService us = new UserServiceImpl();//test addUser user1 = new User();user1.setUserName("asdf");user1.setUserPwd("1234");us.add(user1);//test deleteUser user2 = new User();user2.setId(3);us.delete(user2);//test getByIdUser user3 = us.getById(User.class, 4);System.out.println(user3.getId()+"-->"+user3.getUserName()+"-->"+user3.getUserPwd());        //test CountString[] param = {"asdf"};int cnt = us.getCount("select count(*) from User u where u.userName=?", param);        System.out.println("共有asdf "+Integer.toString(cnt)+" 个。");//test query//test updateUser user4 = new User();user4.setId(4);user4.setUserPwd("000000");us.update(user4);}
}