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超市管理系统总结篇四用户信息展示

在这里插入图片描述

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();
		}

	}

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原文地址：https://www.cnblogs.com/xiaxiaopi/p/14429501.html

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