jsp+servlet增刪改查
1：首先根據數據庫字段創建實體類css
package ceet.ac.cn.model;
//數據封裝類
public class Admin {
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;
}
}
2：創建數據庫鏈接類html
package ceet.ac.cn.dao;
import java.sql.Connection;
import java.sql.DriverManager;
public class DbHelper {
private static String url = "jdbc:mysql://localhost:3306/admin"; //數據庫地址
private static String userName = "root"; //數據庫用戶名
private static String passWord = "359129127"; //數據庫密碼
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) { //測試數據庫是否連通
System.err.println(getConnection());
}
}
3：創建dao層和dao的實現層（daoImple）----這裏把dao層和實現層寫在一塊兒前端
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<Admin> getAllAdmin(){
//查詢全部信息
List<Admin> list = new ArrayList<Admin>(); //建立集合
Connection conn = DbHelper.getConnection();
String sql = "select * from admin"; //SQL查詢語句
try {
PreparedStatement pst = conn.prepareStatement(sql);
ResultSet rst = pst.executeQuery();
while (rst.next()) {
Admin admin = new Admin();
admin.setId(rst.getInt("id")); //獲得ID
admin.setUsername(rst.getString("username"));
admin.setUserpwd(rst.getString("userpwd"));
list.add(admin);
}
rst.close(); //關閉
pst.close(); //關閉
} catch (SQLException e) {
e.printStackTrace(); //拋出異常
}
return list; //返回一個集合
}
//添加信息
public boolean addAdmin(Admin admin){
String sql = "INSERT INTO `admin`(`id`,`username`,`userpwd`) VALUES (?,?,?)"; //添加的SQL語句
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; //是否添加的判斷
} catch (SQLException e) {
e.printStackTrace();
}
return false;
}
//修改
public boolean updateAdmin(Admin admin){
String sql = "UPDATE `admin` SET `username`=?,`userpwd`=? WHERE `id` = ?"; //修改的SQL語句，根據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()); //根據的ID
int count = pst.executeUpdate();
pst.close(); //關閉
return count>0?true:false; //是否修改的判斷
} catch (SQLException e) {
e.printStackTrace();
}
return false;
}
//刪除
public boolean deleteAdmin(int id){
String sql = "delete from admin where id = ?"; //刪除的SQL語句，根據ID刪除
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; //是否刪除的判斷
} catch (SQLException e) {
e.printStackTrace();
}
return false;
}
//根據ID進行查詢
public Admin selectAdminById(int id){
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
}
}
4：創建servlet做爲控制層java
a：創建添加數據的servlet控制層mysql
package ceet.ac.cn.servlet;
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;
import ceet.ac.cn.dao.AdminDao;
import ceet.ac.cn.model.Admin;
@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
//添加數據
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();
//轉值，中文須要轉換爲utf-8
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.addAdmin(admin);
req.getRequestDispatcher("ShowServlet").forward(req, resp);
}
}
b:創建刪除數據servlet控制層sql
package ceet.ac.cn.servlet;
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;
import ceet.ac.cn.dao.AdminDao;
/**
* Servlet implementation class DeleteServlet
*/
@WebServlet("/DeleteServlet")
public class DeleteServlet extends HttpServlet {
//刪除數據
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"); //刪除數據的ID，根據ID刪除
if(idStr != null && !idStr.equals("")){
int id = Integer.valueOf(idStr);
AdminDao dao = new AdminDao();
dao.deleteAdmin(id);
}
req.getRequestDispatcher("ShowServlet").forward(req, resp);
}
}
c：創建查詢全部數據servlet控制層數據庫
package ceet.ac.cn.servlet;
import java.io.IOException;
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 ceet.ac.cn.dao.AdminDao;
import ceet.ac.cn.model.Admin;
/**
* Servlet implementation class ShowServlet
*/
@WebServlet("/ShowServlet")
public class ShowServlet extends HttpServlet {
//顯示所有數據
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<Admin> list = dao.getAllAdmin();
req.setAttribute("list", list);
req.getRequestDispatcher("index.jsp").forward(req, resp);
}
}
d：創建修改數據servlet控制層jsp
package ceet.ac.cn.servlet;
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;
import ceet.ac.cn.dao.AdminDao;
import ceet.ac.cn.model.Admin;
/**
* Servlet implementation class UpdateServlet
*/
@WebServlet("/UpdateServlet")
public class UpdateServlet extends HttpServlet {
//修改
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//查詢到選中ID的值所對應的數據
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 { //根據此ID對數據的值進行修改
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);
}
}
5：創建jsp頁面post
index.jsp測試
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>顯示</title>
<style type="text/css">
table {
border: 1px solid pink;
margin: 0 auto;
}
td{
width: 150px;
border: 1px solid pink;
text-align: center;
}
</style>
</head>
<body>
<table>
<tr>
<td>編號</td>
<td>賬號</td>
<td>密碼</td>
<td>操做</td>
</tr>
<c:forEach items="${list}" var="item">
<tr>
<td>${item.id }</td>
<td>${item.username }</td>
<td>${item.userpwd }</td>
<td><a href="DeleteServlet?id=${item.id }">刪除</a>|<a href="UpdateServlet?id=${item.id }">修改</a></td>
</tr>
</c:forEach>
<tr>
<td colspan="6" style="text-align: left;"><a href="add.jsp">添加管理員</a></td>
</tr>
</table>
</body>
</html>
add.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>添加</title>
<link rel="stylesheet" href="css/index.css" type="text/css" />
</head>
<body>
<form action="AddServlet" method="post">
<table border="1" class="t1">
<tr>
<td colspan="2s"><h1>添加管理員</h1></td>
</tr>
<tr>
<td>管理員賬號:</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>管理員密碼:</td>
<td><input type="password" name="userpwd"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="提交"/>
<input type="reset" value="清空"/>
</td>
</tr>
</table>
</form>
</body>
</html>
updata.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>修改</title>
<link rel="stylesheet" href="css/index.css" type="text/css" />
</head>
<body>
<form action="UpdateServlet" method="post">
<table border="1" class="t1">
<tr>
<td colspan="2"><h1>修改管理員信息</h1></td>
</tr>
<tr>
<td>編號:</td>
<td><input type="text" name="id" value="${admin.id}" readonly="readonly"/></td>
</tr>
<tr>
<td>管理員賬號:</td>
<td><input type="text" name="username" value="${admin.username}"/></td>
</tr>
<tr>
<td>管理員密碼:</td>
<td><input type="text" name="userpwd" value="${admin.userpwd}"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="提交"/>
<input type="button" value="返回" onclick="history.go(-1)"/>
</td>
</tr>
</table>
</form>
</body>
</html>
css代碼部分：
@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 "宋體";
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;
}
增刪改查成果圖：
添加操做：
添加後顯示：
而後進行刪除跟修改。
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相關文章
- 1. 增刪改查
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- 4. 增、刪、查、改
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