下面是一个简单的Servlet和JSP页面交互的例子，展示了如何在Servlet中接收参数，并将这些参数传递给JSP页面。

Servlet示例：LoginServlet.java

```java

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// 获取用户名和密码

String username = request.getParameter("