Question

我想通过任何带结构的链接访问Servlet类，如下所示：http://localhost:8080/loginjsp/Reading/abc。 “abc”可以改变，取决于你。所以我使用了Servlet Annotation

@WebServlet（urlPatterns =“/ Reading / *”）。

但麻烦的是我不能使用RequestDispatcher。我怎么能做到这两个？

Reading.Java

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ReadingTestServlet
 */
@WebServlet(
        urlPatterns = "/Reading/*",
        initParams =
        {
            @WebInitParam(name = "saveDir", value = "D:/FileUpload"),
            @WebInitParam(name = "allowedTypes", value = "jpg,jpeg,gif,png")
        }
)
public class ReadingTestServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        PrintWriter out = response.getWriter();
        RequestDispatcher rd=request.getRequestDispatcher("test.jsp");    
            rd.forward(request,response); 
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

Answer 1

我已经尝试过了，你是对的，有一个问题。问题是你进入一个无限循环，因为你的调度使servlet再次被调用。转发urlPattern将匹配urlPatterns = "/Reading/*"（您正在使用通配符）。在你的urlPatterns中用'abc'替换通配符'*'并且可以工作（我假设你把'test.jsp'放在/ Reading目录中）

顺便说一句，请考虑使用

getServletConfig().getServletContext().getRequestDispatcher("/absolute/path");

在类似的情况下。

不使用RequestDispatcher foward和Servlet Annotation

1 个答案: