Servlet实现简单CRUD

1.首先在数据库中建表

create database student

create table stu(

sno char(10),

sna char(10),

)

insert stu values('001','张三')

insert stu values('002','李四')

2.简单显示student表内容

<body>

  <%

	Connection con = null;

	Statement stmt = null;

	ResultSet rs = null;  

	String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=student;user=sa;password=1";//sa身份连接

	Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

	con = DriverManager.getConnection(url);

	stmt = con.createStatement();  

	request.setCharacterEncoding("utf-8");

	String strsno = "";

	strsno = request.getParameter("sno");

	String SQL = "SELECT * FROM stu";

	rs= stmt.executeQuery(SQL);

%>

    学生信息<br>

    <table border=1>

       <tr>

       <td>学号</td>

       <td>姓名</td>

       <td>操作</td>

       </tr>

       <%while (rs.next()) { %>

        <tr>

       <td><%=rs.getString("sno") %></td>

       <td><%=rs.getString("sna") %></td>

       <td>

       <a href="servlet/s.do?sno=<%=rs.getString("sno") %>" >删除</a>

       <a href="StudentEdit.jsp?sno=<%=rs.getString("sno") %>" >编辑</a>

       </td>

       </tr>

    <% } %>

    </table>

    <a href="StudentAdd.jsp" >插入</a>

  </body>

　　（import="java.sql.*" pageEncoding="utf-8"，添加sqljdbc4.jar这两条从来不能忘）

结果图：

3.建Servlet：s.java(删除，这个命名有点问题)

package com.chao.webcrud;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class s extends HttpServlet {

	/**

	 * The doGet method of the servlet. <br>

	 *

	 * This method is called when a form has its tag value method equals to get.

	 *

	 * @param request the request send by the client to the server

	 * @param response the response send by the server to the client

	 * @throws ServletException if an error occurred

	 * @throws IOException if an error occurred

	 */

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		request.setCharacterEncoding("utf-8");

		String strStudentID = "";

		strStudentID = request.getParameter("sno");

		// 删除数据

		Connection con = null;

		Statement stmt = null;

		ResultSet rs = null;  

		String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=student;user=sa;password=1";//sa身份连接

		try

		{

			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

			con = DriverManager.getConnection(url);  

			String strSql = "delete from stu where sno='" + strStudentID + "'";

			stmt = con.createStatement();

			stmt.execute(strSql);

		}

		catch (Exception e)

		{

			response.setContentType("text/html");

			response.setCharacterEncoding("utf-8");

			PrintWriter out = response.getWriter();

			out.println("删除失败,学号:" + strStudentID+"!");

			out.close();

			return;

		}

		// 跳转

		response.sendRedirect("../index.jsp");

	}

}

删除功能实现并自动跳转到主页

4.插入

先写StudentAdd.jsp

 <body>

<center>

  	<br><br>编辑学生信息<br>

    <form name="f1" id="f1" action="servlet/StudentAdd" method="post">

      <table border="0">

        <tr>

          <td>学号:</td>

          <td><input type="text" name="sno" id="sna" value=""></td>

        </tr>

        <tr>

          <td>姓名:</td>

          <td><input type="text" name="sna" id="sna" value=""></td>

        </tr>

        <tr>

          <td colspan="2" align="center"><input type="submit" value=" 确定 " ></td>

        </tr>

      </table>

    </form>

</center>

 </body>

　然后写Servlet：StudentAdd.java

package com.chao.webcrud;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class StudentAdd extends HttpServlet {

	/**

	 * The doPost method of the servlet. <br>

	 *

	 * This method is called when a form has its tag value method equals to post.

	 *

	 * @param request the request send by the client to the server

	 * @param response the response send by the server to the client

	 * @throws ServletException if an error occurred

	 * @throws IOException if an error occurred

	 */

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		// 获取数据

		request.setCharacterEncoding("utf-8");

		String sno = "";

		sno = request.getParameter("sno");

		String sna = "";

		sna = request.getParameter("sna");

		// 删除数据

		Connection con = null;

		Statement stmt = null;

		ResultSet rs = null;  

		String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=student;user=sa;password=1";//sa身份连接

		try

		{

			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

			con = DriverManager.getConnection(url);  

			String strSql = "insert into stu values('" + sno + "','" + sna + "') ";

			stmt = con.createStatement();

			stmt.execute(strSql);

		}

		catch (Exception e)

		{

			response.setContentType("text/html");

			response.setCharacterEncoding("utf-8");

			PrintWriter out = response.getWriter();

			out.println("修改失败,学号:" + sno+"!");

			out.close();

			return;

		}

		// 跳转

		response.sendRedirect("../index.jsp");

	}

}

结果图：　

5.修改，同插入类似

StudentEdit.jsp

  <body>

  <%

	Connection con = null;

	Statement stmt = null;

	ResultSet rs = null;  

	String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=student;user=sa;password=1";//sa身份连接

	Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

	con = DriverManager.getConnection(url);

	stmt = con.createStatement();  

	request.setCharacterEncoding("utf-8");

	String strID = "";

	strID = request.getParameter("sno");

	String SQL = "SELECT * FROM stu where sno='" + strID + "'";

	rs = stmt.executeQuery(SQL);

%>

<center>

<%if(rs.next()==true){ %>

  	<br><br>编辑学生信息<br>

    <form name="f1" id="f1" action="servlet/StudentEdit" method="post">

      <table border="0">

        <tr>

          <td>学号:</td>

          <td><input type="text" readonly="readonly" name="sno" id="sna" value="<%=rs.getString("sno") %>"> 学号不允许编辑</td>

        </tr>

        <tr>

          <td>姓名:</td>

          <td><input type="text" name="sna" id="sna" value="<%=rs.getString("sna") %>"></td>

        </tr>

        <tr>

          <td colspan="2" align="center"><input type="submit" value=" 确定 " ></td>

        </tr>

      </table>

    </form>

<%} else { %>

<br><br>编辑学生信息<br><br>

修改成功<br><br>

<a href="index.jsp">返回</a>

<%} %>

</center>

  </body>

　　Servlet:StudentEdit.java

package com.chao.webcrud;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.*;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class StudentEdit extends HttpServlet {

	/**

	 * The doPost method of the servlet. <br>

	 *

	 * This method is called when a form has its tag value method equals to post.

	 *

	 * @param request the request send by the client to the server

	 * @param response the response send by the server to the client

	 * @throws ServletException if an error occurred

	 * @throws IOException if an error occurred

	 */

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		// 获取数据

				request.setCharacterEncoding("utf-8");

				String sno = "";

				sno = request.getParameter("sno");

				String sna = "";

				sna = request.getParameter("sna");

				// 删除数据

				Connection con = null;

				Statement stmt = null;

				ResultSet rs = null;  

				String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=student;user=sa;password=1";//sa身份连接

				try

				{

					Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

					con = DriverManager.getConnection(url);  

					String strSql = "update stu set sna='" + sna + "' where sno='" + sno + "'";

					stmt = con.createStatement();

					stmt.execute(strSql);

				}

				catch (Exception e)

				{

					response.setContentType("text/html");

					response.setCharacterEncoding("utf-8");

					PrintWriter out = response.getWriter();

					out.println("修改失败,学号:" + sno+"!");

					out.close();

					return;

				}

				// 跳转

				response.sendRedirect("../StudentEdit.jsp");

	}

}

　　结果图：

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