com.transfer.www-优快云博客

本文详细介绍了TransferServlet类的功能及其实现方式。该Servlet通过doGet方法处理客户端发送的请求，根据请求头中的referer判断来源，并依据参数myoption的值进行不同的页面跳转或转发操作。同时，对于POST请求采用doGet方式进行处理。

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package com.transfer.www;

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class TransferServlet extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     * 
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request
     *            the request send by the client to the server
     * @param response
     *            the response send by the server to the client
     * @throws ServletException
     *             if an error occurred
     * @throws IOException
     *             if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String referer = request.getHeader("referer");
        if(referer == null){
            response.sendRedirect(request.getContextPath() + "/index.jsp");
            return;
        }

        String option = request.getParameter("myoption");
        if (option.equals("code")) {

            request.getRequestDispatcher("/WEB-INF/jsp/code.jsp").forward(
                    request, response);
            return;
        } else {
            response.sendRedirect(request.getContextPath() + "/index.jsp");
            return;
        }

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doGet(request, response);
    }

}