以下是一个简单的Java Web过滤器示例，该过滤器用于过滤访问JSP页面的请求。

创建一个过滤器类`JspFilter`，它实现了`javax.servlet.Filter`接口：

java web过滤器过滤jsp实例，JavaWeb过滤器过滤JSP实例 第1张

```java

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;

import java.io.IOException;

public class JspFilter implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

// 过滤器初始化时调用

}

@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();

// 检查请求是否为JSP页面

if (requestURI.endsWith("