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页面跳转之杠和杠星的区别.md

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123 lines (107 loc) · 3.32 KB

页面跳转之/和/*的区别

  • /和/*的区别：/除了.jsp全过滤；/*全过滤

  • WEB-INF是安全目录，不能直接访问，用转发的方式进去。

一、webapp下页面测试

  • 1、导入jar包 
    <dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.12</version>
  <scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>3.1.0</version>
  <scope>provided</scope>
</dependency>
  • 2、webapp/index.jsp 
    <%--
  Created by IntelliJ IDEA.
  User: sunny
  Date: 2018/8/12
  Time: 13:49
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h3>hello world!</h3>
</body>
</html>
  • 3、HelloServlet.java (/除了.jsp全过滤；/*全过滤) 
    package com.edu.servlet;

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;

@WebServlet("/") //.jsp可以直接访问
public class HelloServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request,
                          HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request,response);
    }

    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println("==============");
    }
}

二、WEB-INF下页面测试

  • 1、导入jar包（同上）

  • 2、webapp/WEB-INF/hello.jsp

    <%--
  Created by IntelliJ IDEA.
  User: sunny
  Date: 2018/8/12
  Time: 14:36
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h3>Hello world WEB-INF!</h3>
</body>
</html>

  • 3、HelloServlet.java

    package com.edu.servlet;

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;

@WebServlet("/*")  //所有请求（无论在根目录后加任何请求）全跳转到webapp/WEB-INF/hello.jsp；
public class HelloServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request,
                          HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request,response);
    }

    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println("==============");
        request.getRequestDispatcher("/WEB-INF/hello.jsp").forward(request,response);
    }
}