404错误:request.getRequestDispatcher方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | package com.demo.servlet; import com.demo.dao.UsersDAO; import com.demo.entity.Users; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.List; @WebServlet ( "/index" ) public class FindAllServlet extends HttpServlet { private UsersDAO usersDAO = new UsersDAO(); @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this .doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List<Users> list = usersDAO.findAll(); System.out.println( "List = " + list); request.setAttribute( "usersList" , list); request.getRequestDispatcher( "index.jsp" ).forward(request, response); } } 控制台可以打印出List,跳转后报错 404 。关于request.getRequestDispatcher方法其后的路径此处为什么可 以直接写( "index.jsp" ),而不需要写成(request.getContextPath()+ "index.jsp" )? |
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