以下是一个简单的JSP Servlet用户登录实例的代码:
```java
// UserLoginServlet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class UserLoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 设置响应内容类型
response.setContentType("