tomcat做域名跳转

<web-app>
    <error-page>
        <error-code>404</error-code>
        <location>/redirect.jsp</location>
    </error-page>
</web-app>

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
    response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
    String newUrl = "http://newdomain.com";
    response.setHeader("Location", newUrl);
%>

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class RedirectFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.sendRedirect("http://newdomain.com");
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override
    public void destroy() {}
}

<filter>
    <filter-name>RedirectFilter</filter-name>
    <filter-class>com.example.RedirectFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>RedirectFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>