Servlet路径跳转

一绝对路径：放之四海而皆准的路径。

二相对路径：相对于当前资源的路径。

三代码

1、index.jsp

<%@ page language = "java" import = "java.util.*" contentType = "text/html; charset=utf-8" %>

String path = request.getContextPath();

String basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +request.getServerPort()+path+ "/" ;

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

< html >

< head >

< base href = " <%= basePath %> " >

< title > My JSP 'index.jsp' starting page </ title >

< meta http-equiv = "pragma" content = "no-cache" >

< meta http-equiv = "cache-control" content = "no-cache" >

< meta http-equiv = "expires" content = "0" >

< meta http-equiv = "keywords" content = "keyword1,keyword2,keyword3" >

< meta http-equiv = "description" content = "This is my page" >

<!--

-->

</ head >

< body >

< h1 > Servlet 路径跳转 </ h1 >

< hr >

< a href = "servlet/HelloServlet" > 使用相对路径访问HelloServlet! </ a >< br >

< a href = " <%= path %> /servlet/HelloServlet" > 使用绝对路径访问HelloServlet! </ a >< br >

< a href = "servlet/TestServlet" > 访问TestServlet,跳转到Test.jsp </ a >

</ body >

</ html >

2、web.xml

<? xml version = "1.0" encoding = "UTF-8" ?>

< web-app version = "2.5"

xmlns = " http://java.sun.com/xml/ns/javaee" ;

xmlns:xsi = " http://www.w3.org/2001/XMLSchema-instance" ;

xsi:schemaLocation = " http://java.sun.com/xml/ns/javaee

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" ; >

< display-name ></ display-name >

< servlet >

< description > This is the description of my J2EE component </ description >

< display-name > This is the display name of my J2EE component </ display-name >

< servlet-name > HelloServlet </ servlet-name >

< servlet-class > servlet.HelloServlet </ servlet-class >

</ servlet >

< servlet >

< description > This is the description of my J2EE component </ description >

< display-name > This is the display name of my J2EE component </ display-name >

< servlet-name > TestServlet </ servlet-name >

< servlet-class > servlet.TestServlet </ servlet-class >

</ servlet >

< servlet-mapping >

< servlet-name > HelloServlet </ servlet-name >

< url-pattern > / servlet /HelloServlet </ url-pattern >

</ servlet-mapping >

< servlet-mapping >

< servlet-name > TestServlet </ servlet-name >

< url-pattern > / servlet /TestServlet </ url-pattern >

</ servlet-mapping >

< welcome-file-list >

< welcome-file > index.jsp </ welcome-file >

</ welcome-file-list >

</ web-app >

3、TestServlet.java

package servlet;

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;

public class TestServlet extends HttpServlet {

/**

* Constructor of the object.

public TestServlet() {

super();

}

/**

* Destruction of the servlet. <br>

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

/**

* 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 {

doPost(request,response);

}

/**

* The doPost method of the servlet. <br>

* This method is called when a form has its tag value method equals to post.

* @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 doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//请求重定向方式跳转到test.jsp,当前路径是ServletPathDirection/servlet/，所有下面这句不对

//response.sendRedirect("test.jsp");

//使用request.getContextPath获得上下文对象

//response.sendRedirect(request.getContextPath()+"/test.jsp");

//服务器内部跳转,这里的斜线表示项目的根目录

//request.getRequestDispatcher("/test.jsp").forward(request, response);

request.getRequestDispatcher("../test.jsp").forward(request, response);

}

/**

* Initialization of the servlet. <br>

* @throws ServletException if an error occurs

public void init() throws ServletException {

// Put your code here

}

四测试

猜你喜欢