java web基础 --- URL重定向Filter_chain.dofilter查看重定向url

httpRequest.getRequestDispatcher("/helloWorld").forward(httpRequest, response);

服务器端转发，不改变浏览器端URL地址，常用

httpResponse.sendRedirect(uri);

浏览器端重定向，改变URL在浏览器地址栏

URLOverWriteFilter.java

package com.web1.util;
 
import java.io.IOException;
 
import javax.print.attribute.standard.ReferenceUriSchemesSupported;
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.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * Servlet Filter implementation class URLOverWriteFilter
 */
@WebFilter("/URLOverWriteFi