超市管理系统总结篇四用户信息展示
- 导入分页的工具类-PageSupport
- 用户列表页面导入-userlist.jsp
1、获取用户数量
- 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, Exception;
- UserDaoImpl
@Override
public int getUserCount(Connection connection, String userName, int userRole)
throws Exception {
// TODO Auto-generated method stub
PreparedStatement pstm = null;
ResultSet rs = null;
int count = 0;
if(connection != null){
StringBuffer sql = new StringBuffer();
sql.append("select count(1) as count from smbms_user u,smbms_role r where u.userRole = r.id");
List<Object> list = new ArrayList<Object>();
if(!StringUtils.isNullOrEmpty(userName)){
sql.append(" and u.userName like ?");
list.add("%"+userName+"%");
}
if(userRole > 0){
sql.append(" and u.userRole = ?");
list.add(userRole);
}
Object[] params = list.toArray();
System.out.println("sql ----> " + sql.toString());
rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
if(rs.next()){
count = rs.getInt("count");
}
BaseDao.closeResource(null, pstm, rs);
}
return count;
}
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- UserService
//查询记录数
public int getUserCount(String username, int userRole);
12
- UserServiceImpl
//查询记录数
@Override
public int getUserCount(String queryUserName, int queryUserRole) {
// TODO Auto-generated method stub
Connection connection = null;
int count = 0;
System.out.println("queryUserName ---- > " + queryUserName);
System.out.println("queryUserRole ---- > " + queryUserRole);
try {
connection = BaseDao.getConnection();
count = userDao.getUserCount(connection, queryUserName,queryUserRole);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
//System.out.println("count"+count);
return count;
}
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2、获取用户列表
1.UserDao
//通过条件查询-userList
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize)throws Exception;
12
- UserDaoImpl
@Override
public List<User> getUserList(Connection connection, String userName,int userRole,int currentPageNo, int pageSize)
throws Exception {
// TODO Auto-generated method stub
PreparedStatement pstm = null;
ResultSet rs = null;
List<User> userList = new ArrayList<User>();
if(connection != null){
StringBuffer sql = new StringBuffer();
sql.append("select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.userRole = r.id");
List<Object> list = new ArrayList<Object>();
if(!StringUtils.isNullOrEmpty(userName)){
sql.append(" and u.userName like ?");
list.add("%"+userName+"%");
}
if(userRole > 0){
sql.append(" and u.userRole = ?");
list.add(userRole);
}
//在数据库中，分页显示 limit startIndex，pageSize；总数
//当前页 (当前页-1)*页面大小
//0,5 1,0 01234
//5,5 5,0 56789
//10,5 10,0 10~
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
//根据条件查询用户列表
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize);
12
- UserServiceImpl
@Override
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;
}
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3、获取角色操作
为了我们的职责统一，我们可以把角色的操作单独放在一个包中，和pojo类对应。。。
- RoleDao
//获取角色列表
public List<Role> getRoleList(Connection connection)throws Exception;
12
- RoleDaoIpml
public class RoleDaoImpl implements RoleDao {
@Override
public List<Role> getRoleList(Connection connection) throws Exception {
PreparedStatement pstm = null;
ResultSet rs = null;
List<Role> roleList = new ArrayList<Role>();
if (connection != null) {
String sql = "select * from smbms_role";
Object[] params = {};
rs = BaseDao.execute(connection, pstm, rs, sql, params);
while (rs.next()) {
Role _role = new Role();
_role.setId(rs.getInt("id"));
_role.setRoleCode(rs.getString("roleCode"));
_role.setRoleName(rs.getString("roleName"));
roleList.add(_role);
}
BaseDao.closeResource(null, pstm, rs);
}
return roleList;
}
}
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- RoleService
public interface RoleService {
//角色列表查询
public List<Role> getRoleList();
}
- RoleServiceIpml
public class RoleServiceImpl implements RoleService{
private RoleDao roleDao;
public RoleServiceImpl(){
roleDao = new RoleDaoImpl();
}
@Override
public List<Role> getRoleList() {
Connection connection = null;
List<Role> roleList = null;
try {
connection = BaseDao.getConnection();
roleList = roleDao.getRoleList(connection);
} catch (Exception e) {
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
return roleList;
}
}
4、用户显示的Servlet
- 获取用户前端的数据（查询）
- 判断请求是否需要执行，看参数的值判断
- 为了实现分页，需要计算出当前页面和总页面，页面大小…
- 用户列表展示
- 返回前端
//重点、难点
private void query(HttpServletRequest req, HttpServletResponse resp) {
// TODO 自动生成的方法存根
//查询用户列表
//从前端获取数据
//查询用户列表
String queryUserName = 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();
List<User> userList = null;
//第一此请求肯定是走第一页，页面大小固定的
//设置页面容量
int pageSize = 5;//把它设置在配置文件里,后面方便修改
//当前页码
int currentPageNo = 1;
if(queryUserName == null){
queryUserName = "";
}
if(temp != null && !temp.equals("")){
queryUserRole = Integer.parseInt(temp);
}
if(pageIndex != null) {
currentPageNo = Integer.parseInt(pageIndex);
}
//获取用户总数（分页 上一页：下一页的情况）
//总数量（表）
int totalCount = userService.getUserCount(queryUserName,queryUserRole);
//总页数支持
PageSupport pageSupport = new PageSupport();
pageSupport.setCurrentPageNo(currentPageNo);
pageSupport.setPageSize(pageSize);
pageSupport.setTotalCount(totalCount);
int totalPageCount =pageSupport.getTotalPageCount();//总共有几页
//(totalCount+pageSize-1/pageSize)取整
// pageSupport.getTotalCount()
//System.out.println("totalCount ="+totalCount);
//System.out.println("pageSize ="+pageSize);
//System.out.println("totalPageCount ="+totalPageCount);
//控制首页和尾页
//如果页面小于 1 就显示第一页的东西
if(currentPageNo < 1) {
currentPageNo = 1;
}else if(currentPageNo > totalPageCount) {//如果页面大于了最后一页就显示最后一页
currentPageNo =totalPageCount;
}
userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
req.setAttribute("userList", userList);
RoleServiceImpl roleService = new RoleServiceImpl();
List<Role> roleList = roleService.getRoleList();
req.setAttribute("roleList", roleList);
req.setAttribute("totalCount", totalCount);
req.setAttribute("currentPageNo", currentPageNo);
req.setAttribute("totalPageCount", totalPageCount);
req.setAttribute("queryUserName", queryUserName);
req.setAttribute("queryUserRole", queryUserRole);
//返回前端
try {
req.getRequestDispatcher("userlist.jsp").forward(req, resp);
} catch (ServletException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
