javaee CURD C add operation

insert image description here

addStudent.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="AddStudentServlet" method="post">
<pre>
    姓名:<input type='text' name='sname' />
   性别:<input type='text' name='sex' />
   身份证:<input type='text' name='card_id' />
   年龄:<input type='text' name='age' />
班主任:<input type='text' name='tid' />
   <input type='submit' name='sub' value='添加' />
 </pre>
</form>
</body>
</html>

showStudentList.jsp

<%@page import="java.util.List,com.yyy.po.Student"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

<table border="1" width=500>
<%
    List<Student> studentList= (List<Student>)request.getAttribute("list");

     for(Student student:studentList)
     {
%>  
           <tr>
            <td><%= student.getSid() %></td>
            <td><%= student.getSname() %></td>
            <td><%= student.getSex() %></td>
            <td><%= student.getCard_id() %></td>
            
           </tr>
<%  	  
    	 
     }

%>
</table>
<a href="addStudent.jsp">添加</a>
</body>
</html>

AddStudentServlet

package com.yyy.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.yyy.util.DbHelper;

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

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
	
		//获得表单数据
		String sname=request.getParameter("sname");
		String sex=request.getParameter("sex");
		String card_id=request.getParameter("card_id");
		String age=request.getParameter("age");
		String tid=request.getParameter("tid");
		
		//存入数据库
		String sql="insert into student values(null,?,?,?,?,?)";
		
		List<Object> paramList=new ArrayList<Object>();
		
		paramList.add(sname);
		paramList.add(sex);
		paramList.add(card_id);
		paramList.add(age);
		paramList.add(tid);
		
		DbHelper dbHelper=new DbHelper();
		
		if(dbHelper.executeUpdate(sql, paramList)>0)
		{
    
    
		     //跳转到学生列表页面
			response.sendRedirect("ShowStudentsServlet");
		}
		else
			response.getWriter().println("添加失败");
	}

	/**
	 * @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);
	}

}

ShowStudentsServlet

package com.yyy.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.yyy.po.Student;
import com.yyy.util.DbHelper;

/**
 * Servlet implementation class ShowStudentsServlet
 */
@WebServlet("/ShowStudentsServlet")
public class ShowStudentsServlet extends HttpServlet {
    
    
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public ShowStudentsServlet() {
    
    
        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
		//查询出所有的学生列表
				String sql="select * from student";
				
				DbHelper dbHelper=new DbHelper();
				
				List<Map<String, Object>> studentList=  dbHelper.executeQuery(sql, null);
				
				List<Student> list=new ArrayList<Student>();
				
				//将list中的map组装成student对象
				for(Map<String, Object> map:studentList)
				{
    
    
					 Student student=new Student();
					 
					 student.setSid(Integer.parseInt(map.get("sid").toString()));
					
					 student.setSname(map.get("sname").toString());
					 
					 student.setSex(map.get("sex").toString());
					 
					 student.setCard_id(map.get("card_id").toString());
					 
					 student.setAge(Integer.parseInt(map.get("age").toString()));
					 
					 student.setTid(Integer.parseInt(map.get("tid").toString()));
					 
					 list.add(student);
				}
				
				//传到jsp页面展示
				request.setAttribute("list", list);
				
				//转发到jsp页面
				request.getRequestDispatcher("showStudentList.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);
	}

}

javaee CURD C add operation

addStudent.jsp

showStudentList.jsp

AddStudentServlet

ShowStudentsServlet

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