以下是一个简单的JSP Servlet过滤器登录实例，用于保护Web应用程序的资源。

```java

jsp servlet过滤器登录实例，JSPServlet过滤器登录实例 第1张

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class LoginFilter implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

// 初始化过滤器配置

}

@Override

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

throws IOException, ServletException {

HttpServletRequest httpRequest = (HttpServletRequest) request;

HttpServletResponse httpResponse = (HttpServletResponse) response;

// 获取请求的URL

String requestURI = httpRequest.getRequestURI();

// 检查是否是登录页面或者登录处理页面

if (requestURI.equals("