Servlet相关配置

配置方式

webXML

定义标签

<url-pattern>

Servlet访问路径

<!--配置Servlet-->
<servlet>
    <!--起个短名-->
    <servlet-name>demo1</servlet-name>
    <!--全类名-->
    <servlet-class>cn.itcast.web.servlet.ServletDemo1</servlet-class>
</servlet>
<!--映射-->
<servlet-mapping>
    <!--映射名称对应类短名-->
    <servlet-name>demo1</servlet-name>
    <!--资源路径-->
    <url-pattern>/demo1</url-pattern>
</servlet-mapping>

注解

定义的<urlpartten>数组：可以为一个servlet定义多个访问路径。

package cn.itcast.web.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;

/**
 * @author 旗木五五开
 * @create 2020-02-19 0:08
 */
@WebServlet({"/d4","/dd4","/ddd4"})
//{}多个，数组用大括号
public class ServletDemo4 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("doGet");
    }
}

 

 路径定义规则

1. /xxx
2. /xxx/xxx：多层路径。目录结构
3. /*.do

多层路径。目录结构

package cn.itcast.web.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;

/**
 * @author 旗木五五开
 * @create 2020-02-19 0:08
 */
@WebServlet("/user/demo4")
public class ServletDemo4 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("doGet");
    }
}

 *代表任意，想写啥就写啥，写啥都能访问到。直接写/*。后面写什么都能访问到

优先级最低，别的都访问不到，才访问

package cn.itcast.web.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;

/**
 * @author 旗木五五开
 * @create 2020-02-19 0:08
 */
@WebServlet("/user/*")
public class ServletDemo4 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("doGet");
    }
}

 

*.do：*所有，do后缀名。注意不要写错，*.啥都行

注意*前不要加/

加了就——报错

package cn.itcast.web.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;

/**
 * @author 旗木五五开
 * @create 2020-02-19 0:08
 */
@WebServlet("*.do")
public class ServletDemo4 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("doGet");
    }
}