版權聲明：本文爲博主原創文章，未經博主允許不得轉載。 https://blog.csdn.net/liuxiaowei_java96/article/details/78532649
用戶註冊數據庫登記
1、註冊頁.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 = "regService.jsp" method = "post">
用戶名:<input type = "text" name = "username" value = ""/><br/>
密碼:<input type = "password" name = "password" value = ""/><br/>
<input type = "submit" value = "註冊"/>
</form>
</body>
</html>2、註冊服務.jsp(判斷用戶名和密碼是否合法，合法就插入到數據庫)
<%@ 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>
<%
String username = request.getParameter("username");
String password = request.getParameter("password");
boolean usernameCheck = (null != username && username.trim().length() > 6);
boolean passwordCheck = (null != password && password.trim().length() > 6);
if(usernameCheck && passwordCheck) {
//往數據庫插入數據
%>
<jsp:forward page = "regSuccess.jsp">
<jsp:param value = "<%=username %>" name = "username"/>
<jsp:param value = "<%=password %>" name = "password"/>
</jsp:forward>
<%
} else {
%>
<jsp:forward page = "regError.jsp"></jsp:forward>
<%
}
%>
</body>
</html>3、註冊成功.jsp
<%@page import="hellojsp.AccountGet"%>
<%@page import="hellojsp.Account"%>
<%@page import="java.util.List"%>
<%@page import="hellojsp.RegInsert"%>
<%@ 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>
<style>
table,table tr th, table tr td { border:1px solid #0094ff; }
table { width: 200px; min-height: 25px; line-height: 25px; text-align: center; border-collapse: collapse;}
</style>
</head>
<body>
<h1>恭喜您，註冊成功！</h1>
<% String username = request.getParameter("username");
String password = request.getParameter("password");
RegInsert.insert(username, password);
%>
<h1>顯示所有用戶註冊信息</h1>
<table>
<thead>
<tr>
<th>userName</th>
<th>password</th>
</tr>
</thead>
<tbody>
<%
List<Account> accounts = AccountGet.getAccount();
for(Account account : accounts) {
out.println("<tr>");
out.println("<td>" + account.getUsername() + "</td>" + "<td>" + account.getPassword() + "</td>");
out.println("</tr>");
}
%>
</tbody>
</table>
</body>
</html>4、註冊錯誤.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>
<h1>用戶名或者密碼爲空或者長度不大於6，請<a href= "reg.jsp">點擊重新註冊</a></h1>
</body>
</html>5、用戶名和密碼插入數據庫的方法.java
package hellojsp;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class RegInsert {
public static void insert(String username, String pword) {
Connection conn = null;
PreparedStatement ps = null;
String url = "jdbc:mysql://localhost:3306/jsp";
String user = "root";
String password = "";
try {
//1、選擇數據庫：加載數據庫驅動
Class.forName("com.mysql.jdbc.Driver");
//2、連接數據庫
conn = DriverManager.getConnection(url, user, password);
//3、創建數據庫查詢
ps = conn.prepareStatement("INSERT INTO account_table(username,password) VALUES(?,?)");
ps.setString(1, username);
ps.setString(2, pword);
//4、獲取查詢結果
int i = ps.executeUpdate();
System.out.println("一共執行了" + i + "條");
} catch (ClassNotFoundException e) {
System.out.println("數據庫驅動沒有找到");
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
//5、關閉查詢和連接
try {
if (null != ps) {
ps.close();
}
if (null != conn) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}6、賬號類.java
package hellojsp;
public class Account {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}7、查詢數據庫內所有用戶名和密碼的方法.java
package hellojsp;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class AccountGet {
public static List<Account> getAccount(){
List<Account> accounts = new ArrayList<Account>();
Connection conn = null;
PreparedStatement ps = null;
String url = "jdbc:mysql://localhost:3306/jsp";
String user = "root";
String password = "";
try {
//1、選擇數據庫：加載數據庫驅動
Class.forName("com.mysql.jdbc.Driver");
//2、連接數據庫
conn = DriverManager.getConnection(url, user, password);
//3、創建數據庫查詢
ps = conn.prepareStatement("SELECT username,password FROM account_table");
//4、獲取查詢結果
ResultSet rs = ps.executeQuery();
while(rs.next()) {
Account account = new Account();
String username = rs.getString("username");
String pword = rs.getString("password");
account.setUsername(username);
account.setPassword(pword);
accounts.add(account);
}
} catch (ClassNotFoundException e) {
System.out.println("數據庫驅動沒有找到");
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
//5、關閉查詢和連接
try {
if (null != ps) {
ps.close();
}
if (null != conn) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
return accounts;
}
}