话不多说，请看代码

package ceet.ac.cn.dao;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import ceet.ac.cn.model.Admin;

public class AdminDao {

public List getAllAdmin(){ //查询所有信息

List list = new ArrayList(); //创建集合

Connection conn = DbHelper.getConnection();

String sql = "select * from admin"; //SQL查询语句

try {

PreparedStatement pst = conn.prepareStatement(sql);

ResultSet rst = pst.executeQuery();

while (rst.next()) {

Admin admin = new Admin();

admin.setId(rst.getInt("id")); //得到ID

admin.setUsername(rst.getString("username"));

admin.setUserpwd(rst.getString("userpwd"));

list.add(admin);

}

rst.close(); //关闭

pst.close(); //关闭

} catch (SQLException e) {

e.printStackTrace(); //抛出异常

}

return list; //返回一个集合

}

public boolean addAdmin(Admin admin){ //添加信息

String sql = "INSERT INTO `admin`(`id`,`username`,`userpwd`) VALUES (?,?,?)"; //添加的SQL语句

Connection conn = DbHelper.getConnection();

try {

PreparedStatement pst = conn.prepareStatement(sql);

pst.setInt(1, admin.getId());

pst.setString(2, admin.getUsername());

pst.setString(3, admin.getUserpwd());

int count = pst.executeUpdate();

pst.close();

return count>0?true:false; //是否添加的判断

} catch (SQLException e) {

e.printStackTrace();

}

return false;

}

public boolean updateAdmin(Admin admin){ //修改

String sql = "UPDATE `admin` SET `username`=?,`userpwd`=? WHERE `id` = ?"; //修改的SQL语句，根据ID修改

Connection conn = DbHelper.getConnection();

try {

PreparedStatement pst = conn.prepareStatement(sql);

pst.setString(1, admin.getUsername());

pst.setString(2, admin.getUserpwd());

pst.setInt(3, admin.getId()); //根据的ID

int count = pst.executeUpdate();

pst.close(); //关闭

return count>0?true:false; //是否修改的判断

} catch (SQLException e) {

e.printStackTrace();

}

return false;

}

public boolean deleteAdmin(int id){ //删除

String sql = "delete from admin where id = ?"; //删除的SQL语句，根据ID删除

Connection conn = DbHelper.getConnection();

try {

PreparedStatement pst = conn.prepareStatement(sql);

pst.setInt(1, id);

int count = pst.executeUpdate();

pst.close();

return count>0?true:false; //是否删除的判断

} catch (SQLException e) {

e.printStackTrace();

}

return false;

}

public Admin selectAdminById(int id){ //根据ID进行查询

Connection conn = DbHelper.getConnection();

String sql = "select * from admin where id = "+id;

Admin admin = null;

try {

PreparedStatement pst = conn.prepareStatement(sql);

ResultSet rst = pst.executeQuery();

while (rst.next()) {

admin = new Admin();

admin.setId(rst.getInt("id"));

admin.setUsername(rst.getString("username"));

admin.setUserpwd(rst.getString("userpwd"));

}

rst.close();

pst.close();

} catch (SQLException e) {

e.printStackTrace();

}

return admin; //返回

}

}

package ceet.ac.cn.dao;

import java.sql.Connection;

import java.sql.DriverManager;

/**

* 连接数据库

* @author 画船听雨眠

*

*/

public class DbHelper {

private static String url = "jdbc:mysql://localhost:3306/admin"; //数据库地址

private static String userName = "root"; //数据库用户名

private static String passWord = "359129127"; //数据库密码

private static Connection conn = null;

private DbHelper(){

}

public static Connection getConnection(){

if(null == conn){

try {

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection(url, userName, passWord);

} catch (Exception e) {

e.printStackTrace();

}

}

return conn;

}

public static void main(String[] args) { //测试数据库是否连通

System.err.println(getConnection());

}

}

package ceet.ac.cn.model;

import java.io.Serializable;

public class Admin implements Serializable{ //数据封装类

private static final long serialVersionUID = 1L;

private int id;

private String username;

private String userpwd;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getUserpwd() {

return userpwd;

}

public void setUserpwd(String userpwd) {

this.userpwd = userpwd;

}

}

package ceet.ac.cn.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import ceet.ac.cn.dao.AdminDao;

import ceet.ac.cn.model.Admin;

public class AddServlet extends HttpServlet{ //添加数据

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

this.doPost(req, resp);

}

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

String username = req.getParameter("username");

String userpwd = req.getParameter("userpwd");

Admin admin = new Admin();

admin.setUsername(new String(username.getBytes("ISO-8859-1"),"UTF-8")); //转值，中文需要转换为utf-8

admin.setUserpwd(new String(userpwd.getBytes("ISO-8859-1"),"UTF-8"));

AdminDao dao = new AdminDao();

dao.addAdmin(admin);

req.getRequestDispatcher("ShowServlet").forward(req, resp);

}

}

package ceet.ac.cn.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import ceet.ac.cn.dao.AdminDao;

public class DeleteServlet extends HttpServlet{ //删除数据

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

this.doPost(req, resp);

}

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

String idStr = req.getParameter("id"); //删除数据的ID，根据ID删除

if(idStr != null && !idStr.equals("")){

int id = Integer.valueOf(idStr);

AdminDao dao = new AdminDao();

dao.deleteAdmin(id);

}

req.getRequestDispatcher("ShowServlet").forward(req, resp);

}

}

package ceet.ac.cn.servlet;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import ceet.ac.cn.dao.AdminDao;

import ceet.ac.cn.model.Admin;

public class ShowServlet extends HttpServlet{ //显示全部数据

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

this.doPost(req, resp);

}

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

AdminDao dao = new AdminDao();

List list = dao.getAllAdmin();

req.setAttribute("list", list);

req.getRequestDispatcher("index.jsp").forward(req, resp);

}

}

package ceet.ac.cn.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import ceet.ac.cn.dao.AdminDao;

import ceet.ac.cn.model.Admin;

public class UpdateServlet extends HttpServlet{ //修改

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException { //查询到选中ID的值所对应的数据

String idStr = req.getParameter("id");

if(idStr != null && !idStr.equals("")){

int id = Integer.valueOf(idStr);

AdminDao dao = new AdminDao();

Admin admin = dao.selectAdminById(id);

req.setAttribute("admin", admin);

}

req.getRequestDispatcher("update.jsp").forward(req, resp);

}

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException { //根据此ID对数据的值进行修改

String username = req.getParameter("username");

String userpwd = req.getParameter("userpwd");

String idStr = req.getParameter("id");

Admin admin = new Admin();

admin.setId(Integer.valueOf(idStr));

admin.setUsername(new String(username.getBytes("ISO-8859-1"),"UTF-8"));

admin.setUserpwd(new String(userpwd.getBytes("ISO-8859-1"),"UTF-8"));

AdminDao dao = new AdminDao();

dao.updateAdmin(admin);

req.getRequestDispatcher("ShowServlet").forward(req, resp);

}

}

添加

添加管理员
管理员帐号:
管理员密码:

pageEncoding="utf-8"%>

显示

table {

border: 1px solid pink;

margin: 0 auto;

}

td{

width: 150px;

border: 1px solid pink;

text-align: center;

}

编号	帐号	密码	操作
${item.id }	${item.username }	${item.userpwd }	删除|修改
添加管理员

修改

修改管理员信息
编号:
管理员帐号:
管理员密码:

@CHARSET "UTF-8";

table.t1 {

margin-top:10px;

margin-left:20px;

margin-right:20px;

margin-bottom:5px;

#background-color: #FFF;

#background:#EEF4F9;

#border: none;

border: 1;

#color:#003755;

border-collapse:collapse;

font: 14px "宋体";

text-align: center;

}

table.t1 th{

background:#7CB8E2;

color:#fff;

padding:6px 4px;

text-align:center;

}

table.t1 td{

background:#C7DDEE none repeat-x scroll center left;

color:#000;

padding:4px 2px;

}

table.t1 a{

text-decoration:none;

height:1em;

}

table.t1 a:link, table.t1 a:visited{

color:#3366CC;

}

table.t1 a:hover{

color:#B50000;

text-decoration:underline;

}

最简单的jsp+servlet的增删改查代码。写的很清楚，就这样了。

实现原理：

每行数据后面加一个编辑和删除按钮，按钮提交到后台并且带有此行数据的主要参数。

点击编辑按钮，通过servlet操作jsp将此行的每一列替换为一个文本框并把已有的值带进去，后面一个提交按钮通过submit提交数据并将文本框重新变为表格的单元格。

新增，就像编辑一样，添加一行，全部是文本框。。。

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持脚本之家！