JavaWeb项目(登录注册页面)全过程详细代码
时间: 2024-05-31 20:09:08 浏览: 23
这里给出一个简单的登录注册页面的JavaWeb项目的全过程详细代码,包括数据库的操作和页面的显示:
1. 首先创建一个JavaWeb项目,导入相关的jar包,包括servlet-api.jar、jsp-api.jar、mysql-connector-java.jar等等。
2. 创建一个数据库,包括用户表和管理员表。
用户表:
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL,
`password` varchar(50) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
管理员表:
CREATE TABLE `admin` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL,
`password` varchar(50) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
3. 编写登录页面login.jsp和注册页面register.jsp,其中包括表单和提交按钮。
login.jsp:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录页面</title>
</head>
<body>
<h1>登录页面</h1>
<form action="${pageContext.request.contextPath}/LoginServlet" method="post">
用户名:<input type="text" name="username"><br/><br/>
密 码:<input type="password" name="password"><br/><br/>
<input type="submit" value="登录">
</form>
<a href="${pageContext.request.contextPath}/register.jsp">注册</a>
</body>
</html>
register.jsp:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注册页面</title>
</head>
<body>
<h1>注册页面</h1>
<form action="${pageContext.request.contextPath}/RegisterServlet" method="post">
用户名:<input type="text" name="username"><br/><br/>
密 码:<input type="password" name="password"><br/><br/>
<input type="submit" value="注册">
</form>
<a href="${pageContext.request.contextPath}/login.jsp">返回登录页面</a>
</body>
</html>
4. 编写登录和注册的Servlet,包括数据库的操作。
LoginServlet:
package com.example.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public LoginServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String password = request.getParameter("password");
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123456");
String sql = "select * from user where username=? and password=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
ResultSet rs = ps.executeQuery();
if (rs.next()) {
out.print("登录成功!");
} else {
out.print("用户名或密码错误!");
}
rs.close();
ps.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
RegisterServlet:
package com.example.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public RegisterServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String password = request.getParameter("password");
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123456");
String sql = "insert into user (username, password) values (?, ?)";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
int result = ps.executeUpdate();
if (result > 0) {
out.print("注册成功!");
} else {
out.print("注册失败!");
}
ps.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
5. 配置web.xml文件,将Servlet和页面对应起来。
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>JavaWebDemo</display-name>
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.example.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/LoginServlet</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>RegisterServlet</servlet-name>
<servlet-class>com.example.servlet.RegisterServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RegisterServlet</servlet-name>
<url-pattern>/RegisterServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>
6. 启动Tomcat服务器,访问登录页面和注册页面进行测试。
以上就是一个简单的登录注册页面的JavaWeb项目的全过程详细代码。
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