smbms项目心得day2
用户管理实现
思路：
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1.导入分页的工具类
2.用户列表页面导入
useradd.jsp
rollpage.jsp
1.获取用户数量
（select count(1) as count from smbms_user u,smbms_role r where u.userRole=r.id 连表查询）
1.USerDao
//根据用户名或者角色查询用户总数
public int getUserCount(Connection connection,String username,int userRole) throws SQLException;
}
2.USerDaoImpl
//根据用户名或者角色查询用户总数
public int getUserCount(Connection connection, String username, int userRole) throws SQLException {
PreparedStatement preparedStatement=null;
ResultSet resultSet= null;
int count = 0;
if(connection!=null){
StringBuffer sql = new StringBuffer();
//这里使用StringBuffer是因为这个sql是可变的 要做到随时添加条件语句
sql.append("select count(1) as count from smbms_user u,smbms_role r where u.userRole=r.id ");
ArrayList<Object> list = new ArrayList<Object>();//用arrayList传递参数 （万能）
if (username!=null) {
//如果用户名不为空 就添加用户名查找的条件
sql.append(" and u.userName like ?");
list.add("'"+"%"+username+"%"+"'");//模糊查询条件（LIKE '%三%'）
}
if (userRole>0){
sql.append(" and u.userRole = ?");
list.add(userRole);
}
//将list转换为数组
Object[] params = list.toArray();
//输出完整的sql语句
System.out.println("sql:"+sql);//方便调试
//执行sql
ResultSet rs = BaseDao.executeQuery(connection, preparedStatement, resultSet, sql.toString(), params);
if (rs.next()){
count = rs.getInt("count");//sql返回的是count 拿count即可
}
BaseDao.closeResource(null,preparedStatement,rs);
}return count;
}
}
3.UserService
//通过用户名或者用户角色查询全部总数
public int Usercount( String username, int userRole) throws SQLException;
}
4.UserServiceImpl
public int Usercount(String username, int userRole) {
//调用base获取连接
Connection connection = BaseDao.getconnection();
int userCount =0;
//调用UserDao完成数据库的操作
try {
userCount = userDao.getUserCount(connection,username,userRole);
} catch (SQLException e) {
e.printStackTrace();
}finally {
//关闭资源
BaseDao.closeResource(connection,null,null);
}return userCount;
}
// //测试一下功能
@Test
public void test(){
UserServiceImpl userService = new UserServiceImpl();
int usercount = userService.Usercount(null, 2);
System.out.println(usercount);
}(测试成功)
}
2.获取用户列表
UserDao
//通过条件查询用户列表
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize)throws Exception;
}
UserDaoImpl
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) throws Exception {
PreparedStatement pstm= null;
ResultSet rs = null;
List<User> UserList = new ArrayList<User>();
if (connection!=null){
StringBuffer sql = new StringBuffer();//默认状态下显示所有用户的信息
sql.append("select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.userRole = r.id")
ArrayList<Object> list = new ArrayList<Object>();
if(userName!=null){
//通过userName查询
sql.append(" and u.userName like ?");//前面要带一个空格
list.add("'"+"%"+username+"%"+"'");//模糊查询条件（LIKE '%三%'）
}
if (userRole>0){
sql.append(" and u.userRole = ?");
list.add(userRole);
}
sql.append(" order by creationDate DESC limit ?,?");
currentPageNo = (currentPageNo-1)*pageSize;
list.add(currentPageNo);
list.add(pageSize);
Object[] params = list.toArray();
System.out.println("sql ----> " + sql.toString());
rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
while(rs.next()){
User _user = new User();
_user.setId(rs.getInt("id"));
_user.setUserCode(rs.getString("userCode"));
_user.setUserName(rs.getString("userName"));
_user.setGender(rs.getInt("gender"));
_user.setBirthday(rs.getDate("birthday"));
_user.setPhone(rs.getString("phone"));
_user.setUserRole(rs.getInt("userRole"));
_user.setUserRoleName(rs.getString("userRoleName"));
userList.add(_user);
}
BaseDao.closeResource(null, pstm, rs);
}
return userList;
}
}
}
UserService
//通过条件查询用户列表
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize);
UserServiceImpl
public List<User> getUserList(String queryUserName,int queryUserRole,int currentPageNo, int pageSize) {
// TODO Auto-generated method stub
Connection connection = null;
List<User> userList = null;
System.out.println("queryUserName ---- > " + queryUserName);
System.out.println("queryUserRole ---- > " + queryUserRole);
System.out.println("currentPageNo ---- > " + currentPageNo);
System.out.println("pageSize ---- > " + pageSize);
try {
connection = BaseDao.getConnection();
userList = userDao.getUserList(connection, queryUserName,queryUserRole,currentPageNo,pageSize);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
return userList;
}
3.获取角色操作
RoleDao
public interface RoleDao {
public List<Role> getRoleList(Connection connection) throws SQLException;
}
RoleDaoImpl
public class RoleDaoImpl implements RoleDao {
//获取角色列表
public List<Role> getRoleList(Connection connection) throws SQLException {
PreparedStatement pstm = null;
ResultSet rs = null;
ArrayList<Role> roleList = new ArrayList<Role>();
if (connection != null) {
String sql = "select * from smbms_role";
Object params[] = {};
ResultSet resultSet = BaseDao.executeQuery(connection, pstm, rs, sql, params);
while (resultSet.next()) {
Role role = new Role();
role.setRoleName(resultSet.getString("roleName"));
role.setId(resultSet.getInt("id"));
role.setRoleCode(rs.getString("roleCode"));
roleList.add(role);
}
BaseDao.closeResource(null, pstm, resultSet);
}
return roleList;
}
}
Roleservice
public interface RoleService {
public List<Role> getRoleList();
}
RoleServiceImpl
public class RoleSerivceImpl implements RoleService {
//引入dao
private RoleDao roleDao;
public RoleSerivceImpl() {
roleDao = new RoleDaoImpl();
}
public List<Role> getRoleList() {
List<Role> roleList =null;
Connection connection = null;
connection = BaseDao.getconnection();
try {
roleList = roleDao.getRoleList(connection);
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return roleList;
}
}
4.用户显示的servlet
1、获取用户前端的数据
2、判断用户请求是否执行
3、为了实现分页需要计算出当前页面，总页面、页面大小
4、用户列表展示
5、返回前端
//通过用户名或者角色名查找用户(重难点)
public void query(HttpServletRequest req, HttpServletResponse resp){
//获取前端传过来的数据
String queryName = req.getParameter("queryname");
String Temp = req.getParameter("queryUserRole");
String pageIndex = req.getParameter("pageIndex");
int queryUserRole = 0;
//获取用户列表
UserServiceImpl userService = new UserServiceImpl();
//第一次走这个请求一定是第一页,并且页面大小固定
int pageSize= 5 ;//可以写进配置文件 方便后期修改;
int currentPageNo = 1;
if(queryName == null){
queryName=null;
}
if (Temp!=null && !Temp.equals("")){
queryUserRole = Integer.parseInt(Temp);//给查询赋值 0,1,2,3
}
if(pageIndex!=null){
currentPageNo = Integer.parseInt(pageIndex);//设置当前页码
}
//获取用户端额总数(分页：上一页 下一页)
int totalCount = userService.Usercount(queryName, queryUserRole);
System.out.println(totalCount);
//总页数支持
PageSupport pageSupport= new PageSupport();
pageSupport.setCurrentPageNo(currentPageNo);//设置当前页码的数量
pageSupport.setPageSize(pageSize); //获取页面大小
pageSupport.setTotalPageCount(totalCount); //获取总页数
int totalpageCount = (int)(totalCount/pageSize)+1;//总页数
//控制首页和尾页
if(currentPageNo<1){//如果用户想设置当前页小于1
currentPageNo=1;//强制将页面转换成1
}
// if (currentPageNo>totalpageCount){//如果用户设置当前页大于了最大页
// currentPageNo=totalpageCount;//将当前页直接转换成最大页
// }
// 展示用户列表
List<User> userList = userService.getUserList(queryName, queryUserRole, currentPageNo, pageSize);
req.setAttribute("userList",userList);
//展示角色列表
RoleSerivceImpl roleSerivce = new RoleSerivceImpl();
List<Role> roleList = roleSerivce.getRoleList();
req.setAttribute("roleList",roleList);
//把分页信息传回去
req.setAttribute("totalCount",totalCount);
req.setAttribute("currentPageNo",currentPageNo);
req.setAttribute("totalPageCount",totalpageCount);
//返回前端
try {
req.getRequestDispatcher("userlist.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}