过关测试12_13

实验要求：

　　本次实验花费了很多时间，主要问题还是习惯的去改代码，而不是去写，最后改的自己很迷糊，程序也很多的错误，跟老师说的一样，越改越难，错误越多，但这次也得到了一个教训，那就是还得自己构思，虽说系统间有相同的内容，很类似，但是一味的更改代码还是很麻烦的，在今后的学习中，要避免这种错误。

　　而这次实验费时比较多的还是servlet比较费时，自己掌握的还是不够，在这边费时巨多，建立完数据库之后就开始写javabean，在servlet的编码过程中遇到很多的问题，归根结底还是对servlet掌握不牢固，下课后，一些问题经过百度，询问舍友，最终自己重新书写了一份。

功能设计：

拿到题目后，觉得很简单，只是涉及到单条数据的数据库的增删改查，然后自己就拿起上次课的代码开始胡乱改造……结果……不说了

1.分析题目，建立数据库

通过题目可以看出来，需要两个数据库表，一个存放商品信息，另一个存放出入库单据

2。jdbc数据库连接

这一部分直接拿出之前的代码就ok，没有什么问题

3.根据数据库建立两个javabean

最基础的，这要是再不会，估计就得退学了

4.建立dao操作

主要就是涉及到功能的实现，包括：货物入库对货物进行添加，同时交易记录进行添加，检查商品名和日期是否存在和根据关键词进行查找

5.建立servlet

这一部分可是占用了好多时间，主要是数据的传递，然后调用dao的函数，对数据库进行操作

6.建立界面

准备就绪后就开始界面的搭建，这个用了之前的界面

主页，不知道用了多少次了，几乎每次都用这个，还挺好用

商品入库，分为两布，先输入商品信息，然后在填表单，之前是直接填表单，然后分别存到两个表，看舍友这么写的，觉得挺好，就copy过来了

看着效果确实不错，剩下的就是功能页（图片上传不全）。

部分功能代码

package dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

import bean.Housebean;
import bean.Housebean;
import dbutil.DButil;

public class Dao {
    public boolean checkdate(String date) {
        boolean flag = true;
        // 查询用户是否已存在
        Connection connection = DButil.getConn();
        Statement statement = null;
        ResultSet rs = null;
        try {
            statement = connection.createStatement();
            rs = statement.executeQuery("select * from documents");// 数据库结果集
            while (rs.next()) {
                if (date.equals(rs.getString("date"))) {

                    flag = false;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, statement, connection);
        }
        return flag;
    }// 检查date是否存在

    public boolean checkReg(String name) {
        boolean flag = true;
        // 查询用户是否已存在
        Connection connection = DButil.getConn();
        Statement statement = null;
        ResultSet rs = null;
        try {
            statement = connection.createStatement();
            rs = statement.executeQuery("select * from goods");// 数据库结果集
            while (rs.next()) {
                if (name.equals(rs.getString("name"))) {

                    flag = false;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, statement, connection);
        }
        return flag;
    }// 检查商品名是否存在

    public void Goodsinsert(String name, String manufacturer, String model, String specifications) {
        Connection connnection = DButil.getConn();
        ResultSet rs = null;
        Statement statement = null;
        try {
            String sql = "insert into goods(name,shop,xinghao,guige) values('" + name + "','" + manufacturer + "','" + model
                    + "','" + specifications + "')";
            statement = connnection.prepareStatement(sql);
            statement.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, statement, connnection);
        }

    }

    public void Documentsinsert(String name, String manufacturer, String model, String specifications, int amount,
            String date, String time, String entity, String deliveryman) {
        Connection connnection = DButil.getConn();
        ResultSet rs = null;
        Statement statement = null;
        try {
            String sql = "insert into documents(name,shop,xinghao,guige,num,date,time,inname,outname) values('" + name + "','"
                    + manufacturer + "','" + model + "','" + specifications + "','" + amount + "','" + date + "','"
                    + time + "','" + entity + "','" + deliveryman + "')";
            statement = connnection.prepareStatement(sql);
            statement.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, statement, connnection);
        }

    }

    public void Delete(String name) {
        ResultSet rs = null;
        Statement statement = null;
        Connection connection = DButil.getConn();
        try {
            String sql = "delete from goods where name='" + name + "'";
            statement = connection.createStatement();
            statement.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, statement, connection);
        }

    }

    public Housebean selectname(String sname) {
        Housebean selectbean = new Housebean();
        Connection connection = DButil.getConn();
        Statement statement = null;
        ResultSet rs = null;
        try {
            statement = connection.createStatement();

            // 要执行的SQL语句
            String sql = "select * from documents where name='" + sname + "'";

            // 结果集
            rs = statement.executeQuery(sql);

            while (rs.next()) {

                String name = rs.getString("name");
                String manufacturer = rs.getString("shop");
                String model = rs.getString("xinghao");
                String specifications = rs.getString("guige");
                int amount = rs.getInt("num");
                String date = rs.getString("date");
                String time = rs.getString("time");
                String entity = rs.getString("inname");
                String deliveryman = rs.getString("outname");
                selectbean.setManufacturer(manufacturer);
                selectbean.setModel(model);
                selectbean.setName(name);
                selectbean.setSpecifications(specifications);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, statement, connection);
        }
        return selectbean;
    }

    public Housebean selectdate(String date) {
        Housebean selectbean = new Housebean();
        Connection connection = DButil.getConn();
        Statement statement = null;
        ResultSet rs = null;
        try {
            statement = connection.createStatement();

            // 要执行的SQL语句
            String sql = "select * from documents where date='" + date + "'";

            // 结果集
            rs = statement.executeQuery(sql);

            while (rs.next()) {

                String name = rs.getString("name");
                String manufacturer = rs.getString("shop");
                String model = rs.getString("xinghao");
                String specifications = rs.getString("guige");
                selectbean.setManufacturer(manufacturer);
                selectbean.setModel(model);
                selectbean.setName(name);
                selectbean.setSpecifications(specifications);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, statement, connection);
        }
        return selectbean;
    }
}

package servlet;
import dao.Dao;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class dateselect
 */
@WebServlet("/dateselect")
public class dateselect extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public dateselect() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf8");
        request.setCharacterEncoding("utf-8");
        response.getWriter().append("Served at: ").append(request.getContextPath());
        String date=request.getParameter("date");
        Dao dao=new Dao();
        if(!dao.checkdate(date))
        {
            String name=dao.selectdate(date).getName();
            String manufacturer=dao.selectdate(date).getManufacturer();
            String model=dao.selectdate(date).getModel();
            String specifications=dao.selectdate(date).getSpecifications();
            request.setAttribute("name", name);
            request.setAttribute("manufacturer", manufacturer);
            request.setAttribute("model", model);
            request.setAttribute("specifications", specifications);
            request.getRequestDispatcher("selectsuccess.jsp").forward(request, response);
        }
        else
            request.getRequestDispatcher("selectfail.jsp").forward(request, response);    
    }
　　protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf8");
        request.setCharacterEncoding("utf-8");
        response.getWriter().append("Served at: ").append(request.getContextPath());
        String name=request.getParameter("name");
        String manufacturer=request.getParameter("manufacturer");
        String model=request.getParameter("model");
        String specifications=request.getParameter("specifications");
        int amount=Integer.valueOf(request.getParameter("amount"));
        String date=request.getParameter("date");
        String time=request.getParameter("time");
        String entity=request.getParameter("entity");
        String deliveryman=request.getParameter("deliveryman");
        Dao dao=new Dao();
        int check=0;
        if(dao.checkReg(name))
        {
            check=1;
        dao.Documentsinsert(name, manufacturer, model, specifications, amount, date, time, entity, deliveryman);
        dao.Goodsinsert(name, manufacturer, model, specifications);
        }
        request.setAttribute("check", check);
        request.getRequestDispatcher("insuccess.jsp").forward(request, response);
    }

　　protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf8");
        request.setCharacterEncoding("utf-8");
        response.getWriter().append("Served at: ").append(request.getContextPath());
        String name=request.getParameter("name");
        Dao dao=new Dao();
        if(!dao.checkReg(name))
        {
            String sname=dao.selectname(name).getName();
            String manufacturer=dao.selectname(name).getManufacturer();
            String model=dao.selectname(name).getModel();
            String specifications=dao.selectname(name).getSpecifications();
            request.setAttribute("name", sname);
            request.setAttribute("manufacturer", manufacturer);
            request.setAttribute("model", model);
            request.setAttribute("specifications", specifications);
            request.getRequestDispatcher("selectsuccess.jsp").forward(request, response);
        }
        else
            request.getRequestDispatcher("selectfail.jsp").forward(request, response);    
        
    }

　　protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf8");
        request.setCharacterEncoding("utf-8");
        response.getWriter().append("Served at: ").append(request.getContextPath());
        String name=request.getParameter("name");
        Dao dao=new Dao();
        int check=0;
        if(!dao.checkReg(name))
        {
            check=1;
            dao.Delete(name);
        }
        request.setAttribute("check", check);
        request.getRequestDispatcher("outsuccess.jsp").forward(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}