spring boot新闻管理条件查询分页展示+新增+编辑

commoditytypeDaoImpl实现类，实现接口方法

@Override
	public Commoditytype getCommoditytypeById(String ct_id) {
		Commoditytype ct = null;
		try {
			Connection conn = DBHelper.getConnection();
			String sql = "select * from commoditytype where ct_id=?";
			List param = new ArrayList();
			param.add(ct_id);
			ResultSet rs = DBHelper.executeQuery(conn, sql, param);
			rs.next();
			ct = new Commoditytype(rs.getString("ct_id"),rs.getString("ct_name"));
			DBHelper.closeConnection(conn);
		}catch(Exception e) {
			e.printStackTrace();
		}
		return ct;
	}

CommoditytypeController控制层传递信息

public class CommoditytypeController {
	private CommoditytypeDao commoditytypeDao = null;
	public CommoditytypeController() {
		commoditytypeDao = new CommoditytypeDaoImpl();
	}
}

CommodityDaoImpl实现类实现接口的方法

@Override
	public List<Commodity> getCommodityList() {
		List<Commodity> commoditys = new ArrayList<Commodity>();
		try {
			Connection conn = DBHelper.getConnection();
			String sql = "select * from commodity";
			ResultSet rs = DBHelper.executeQuery(conn, sql, null);
			while(rs.next()) {
				Commodity c = new Commodity();
				c.setC_id(rs.getString("c_id"));
				c.setC_name(rs.getString("c_name"));
				c.setC_madein(rs.getString("c_madein"));
				c.setC_type(rs.getString("c_type"));
				c.setC_inprice(rs.getInt("c_inprice"));
				c.setC_outprice(rs.getInt("c_outprice"));
				c.setC_num(rs.getInt("c_num"));
				c.setCt(new CommoditytypeDaoImpl().getCommoditytypeById(rs.getString("c_type")));
				commoditys.add(c);
			}
			DBHelper.closeConnection(conn);
		}catch(Exception e) {
			e.printStackTrace();
		}
		return commoditys;
	}

CommodityController控制层

public class CommodityController {
	private CommodityDao commodityDao = null;
	public CommodityController() {
		commodityDao = new CommodityDaoImpl();
	}
	public List<Commodity> getCommodityList() {
		return commodityDao.getCommodityList();
	}
}

CommoditytypeDaoImpl实现类

public class CommoditytypeDaoImpl implements CommoditytypeDao{

	@Override
	public Commoditytype getCommoditytypeById(String ct_id) {
		Commoditytype ct = null;
		try {
			Connection conn = DBHelper.getConnection();
			String sql = "select * from commoditytype where ct_id=?";
			List param = new ArrayList();
			param.add(ct_id);
			ResultSet rs = DBHelper.executeQuery(conn, sql, param);
			rs.next();
			ct = new Commoditytype(rs.getString("ct_id"),rs.getString("ct_name"));
			DBHelper.closeConnection(conn);
		}catch(Exception e) {
			e.printStackTrace();
		}
		return ct;
	}

	@Override
	public List<Commoditytype> getCommoditytypeList() {
		List<Commoditytype> cts = new ArrayList<>();
		try {
			Connection conn = DBHelper.getConnection();
			String sql = "select * from commoditytype";
			ResultSet rs = DBHelper.executeQuery(conn, sql, null);
			while(rs.next()) {
				Commoditytype ct = new Commoditytype(rs.getString("ct_id"),rs.getString("ct_name"));
				cts.add(ct);
			}
			DBHelper.closeConnection(conn);
		}catch(Exception e) {
			e.printStackTrace();
		}
		return cts;
	}
}

CommoditytypeController 控制层

public class CommoditytypeController {
	private CommoditytypeDao commoditytypeDao = null;
	public CommoditytypeController() {
		commoditytypeDao = new CommoditytypeDaoImpl();
	}
	
	public List<Commoditytype> getCommoditytypeList(){
		return commoditytypeDao.getCommoditytypeList();
	}
}

CommodityDaoImpl实现类

public class CommodityDaoImpl implements CommodityDao {

	@Override
	public List<Commodity> getCommodityList() {
		List<Commodity> commoditys = new ArrayList<Commodity>();
		try {
			Connection conn = DBHelper.getConnection();
			String sql = "select * from commodity";
			ResultSet rs = DBHelper.executeQuery(conn, sql, null);
			while(rs.next()) {
				Commodity c = new Commodity();
				c.setC_id(rs.getString("c_id"));
				c.setC_name(rs.getString("c_name"));
				c.setC_madein(rs.getString("c_madein"));
				c.setC_type(rs.getString("c_type"));
				c.setC_inprice(rs.getInt("c_inprice"));
				c.setC_outprice(rs.getInt("c_outprice"));
				c.setC_num(rs.getInt("c_num"));
				c.setCt(new CommoditytypeDaoImpl().getCommoditytypeById(rs.getString("c_type")));
				commoditys.add(c);
			}
			DBHelper.closeConnection(conn);
		}catch(Exception e) {
			e.printStackTrace();
		}
		return commoditys;
	}

	@Override
	public int istCommodity(Commodity c) {
		int line = 0;
		try {
			Connection conn = DBHelper.getConnection();
			String sql = "insert into commodity(c_id,c_name,c_madein,c_type,c_inprice,c_outprice,c_num) values (?,?,?,?,?,?,?)";
			List param = new ArrayList();
			param.add(c.getC_id());
			param.add(c.getC_name());
			param.add(c.getC_madein());
			param.add(c.getC_type());
			param.add(c.getC_inprice());
			param.add(c.getC_outprice());
			param.add(c.getC_num());
			
			line = DBHelper.executeUpdate(conn, sql, param);
			
			DBHelper.closeConnection(conn);
		}catch(Exception  e) {
			e.printStackTrace();
		}
		return line;
	}

	@Override
	public int delCommodityById(String c_id) {
		int line = 0;
		Connection conn = DBHelper.getConnection();
		String sql = "delete from commodity where c_id=?";
		List param = new ArrayList();
		param.add(c_id);
		line = DBHelper.executeUpdate(conn, sql, param);
		DBHelper.closeConnection(conn);
		return line;
	}
	
}

CommodityController 控制层

public class CommodityController {
	private CommodityDao commodityDao = null;
	public CommodityController() {
		commodityDao = new CommodityDaoImpl();
	}
	
	public List<Commodity> getCommodityList() {
		return commodityDao.getCommodityList();
	}
	
	public int istCommodity(String c_name,String c_madein,String c_type,Integer c_inprice,Integer c_outprice,Integer c_num) {
		Commodity c = new Commodity(System.currentTimeMillis()+"",c_name,c_madein,c_type,c_inprice,c_outprice,c_num);
		return commodityDao.istCommodity(c);
	}
	
	public int delCommodityById(String c_id) {
		return commodityDao.delCommodityById(c_id);
	}
}

Servlet(ist\del)

public class IstCommodityServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		resp.setCharacterEncoding("utf-8");
		
		String c_name = req.getParameter("c_name");
		String c_madein = req.getParameter("c_madein");
		String c_type = req.getParameter("c_type");
		Integer c_inprice = new Integer(req.getParameter("c_inprice"));
		Integer c_outprice = new Integer(req.getParameter("c_outprice"));
		Integer c_num = new Integer(req.getParameter("c_num"));
		
		int line = new CommodityController().istCommodity(c_name,c_madein,c_type,c_inprice,c_outprice,c_num);
		if(line>0) {
			HttpSession session = req.getSession();
			
			List<Commodity> cList = new CommodityController().getCommodityList();
			session.setAttribute("cList", cList);
			
			List<Commoditytype> ctList = new CommoditytypeController().getCommoditytypeList();
			session.setAttribute("ctList", ctList);
			
			resp.sendRedirect("/web06/welcome.jsp");
		}else {
			
		}
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doGet(req, resp);
	}

}

public class DeleteCommodityById extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		resp.setCharacterEncoding("utf-8");
		
		String c_id = req.getParameter("c_id");
		
		int line = new CommodityController().delCommodityById(c_id);
		if(line>0) {
			HttpSession session = req.getSession();
			
			List<Commodity> cList = new CommodityController().getCommodityList();
			session.setAttribute("cList", cList);
			
			List<Commoditytype> ctList = new CommoditytypeController().getCommoditytypeList();
			session.setAttribute("ctList", ctList);
			
			resp.sendRedirect("/web06/welcome.jsp");
		}else {
			
		}
		
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doGet(req, resp);
	}
	
}

效果展示

本文地址：https://blog.csdn.net/jigsaw6213/article/details/107675919