servlet编写登录注册页面eclipse
时间: 2023-08-10 15:07:07 浏览: 51
下面是一个使用Servlet编写登录注册页面的示例:
首先,需要创建一个Java Web项目。在Eclipse中,可以通过File -> New -> Dynamic Web Project来创建。
接下来,在src目录下创建一个包,例如com.example.servlet,然后在该包下创建两个Servlet类:LoginServlet和RegisterServlet。
LoginServlet.java:
```
package com.example.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
if ("admin".equals(username) && "123".equals(password)) {
response.sendRedirect("success.jsp");
} else {
response.sendRedirect("error.jsp");
}
}
}
```
RegisterServlet.java:
```
package com.example.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/register")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
String email = request.getParameter("email");
// TODO: 将用户名、密码和邮箱保存到数据库中
response.sendRedirect("success.jsp");
}
}
```
在WebContent目录下创建两个JSP页面:login.jsp和register.jsp。
login.jsp:
```
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login</title>
</head>
<body>
<form action="login" method="post">
<label>Username:</label>
<input type="text" name="username"><br>
<label>Password:</label>
<input type="password" name="password"><br>
<input type="submit" value="Login">
</form>
</body>
</html>
```
register.jsp:
```
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Register</title>
</head>
<body>
<form action="register" method="post">
<label>Username:</label>
<input type="text" name="username"><br>
<label>Password:</label>
<input type="password" name="password"><br>
<label>Email:</label>
<input type="email" name="email"><br>
<input type="submit" value="Register">
</form>
</body>
</html>
```
在WebContent目录下创建两个JSP页面:success.jsp和error.jsp。
success.jsp:
```
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Success</title>
</head>
<body>
<h1>Success</h1>
</body>
</html>
```
error.jsp:
```
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Error</title>
</head>
<body>
<h1>Error</h1>
<p>Invalid username or password.</p>
</body>
</html>
```
最后,在web.xml文件中配置Servlet映射:
```
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.example.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login</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>/register</url-pattern>
</servlet-mapping>
```
现在,运行该Web应用程序并访问login.jsp或register.jsp页面即可。