信念!有信念的人经得起任何风暴——奥维德

代码需要用到Opt

实现效果如下:

web访问/index页面正常跳转

手机访问/index页面,跳转到/h5/index页面(这里不只是index页面,其余页面同理)

完整代码:https://gitee.com/VampireAchao/simple-scaffold.git

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package com.ruben.simplescaffold.filter;

import com.ruben.simplescaffold.utils.Opt;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

/**
* 用户浏览器标识过滤器
*
* @author <achao1441470436@gmail.com>
* @since 2021/8/4 17:09
*/
@Slf4j
@Component
@WebFilter(filterName = "LogFilter", urlPatterns = "/**")
public class UserAgentFilter implements Filter {

/**
* 移动端浏览器标识
*/
private final static List<String> MOBILE_AGENT_LIST = Arrays.asList("Android", "iPhone", "iPod", "iPad", "Windows Phone", "MQQBrowser");

/**
* The <code>doFilter</code> method of the Filter is called by the container
* each time a request/response pair is passed through the chain due to a
* client request for a resource at the end of the chain. The FilterChain
* passed in to this method allows the Filter to pass on the request and
* response to the next entity in the chain.
* <p>
* A typical implementation of this method would follow the following
* pattern:- <br>
* 1. Examine the request<br>
* 2. Optionally wrap the request object with a custom implementation to
* filter content or headers for input filtering <br>
* 3. Optionally wrap the response object with a custom implementation to
* filter content or headers for output filtering <br>
* 4. a) <strong>Either</strong> invoke the next entity in the chain using
* the FilterChain object (<code>chain.doFilter()</code>), <br>
* 4. b) <strong>or</strong> not pass on the request/response pair to the
* next entity in the filter chain to block the request processing<br>
* 5. Directly set headers on the response after invocation of the next
* entity in the filter chain.
*
* @param request The request to process
* @param response The response associated with the request
* @param chain Provides access to the next filter in the chain for this
* filter to pass the request and response to for further
* processing
* @throws IOException if an I/O error occurs during this filter's
* processing of the request
* @throws ServletException if the processing fails for any other reason
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
String uri = httpRequest.getRequestURI();
if (uri.contains("favicon")) {
// 过滤图标和错误页面
response.getWriter().write("");
return;
}
// 判断请求是否来自手机
String userAgent = httpRequest.getHeader("User-Agent");
if (Opt.ofNullable(userAgent).filter(agent -> agent.contains("Windows NT")).filter(agent -> agent.contains("compatible; MSIE 9.0;")).or(() -> Opt.ofNullable(userAgent).filter(agent -> !agent.contains("Macintosh"))).filter(agent -> MOBILE_AGENT_LIST.parallelStream().anyMatch(agent::contains)).isPresent()) {
request.getRequestDispatcher("/h5" + uri).forward(request, response);
} else {
chain.doFilter(request, response);
}
}
}