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JavaWeb中Servlet的深入理解

2024-04-02 19:55

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1.servlet:定义:

接口

在这里插入图片描述

2.配置servlet:

public class HelloServlet extends HttpServlet {}
HttpServlet 固定的

IDEA配置v好了
类


package com.example.demo1;

import java.io.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;

@WebServlet(name = "helloServlet", value = "/hello-servlet")

public class HelloServlet extends HttpServlet {
    private String message;

    public void init() {
        message = "Hello World!";
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setContentType("text/html");

        // Hello
        PrintWriter out = response.getWriter();
        out.println("<html><body>");
        out.println("<h1>" + message + "</h1>");
        out.println("</body></html>");
    }

    public void destroy() {
    }
}

xml：


<servlet-name>demo1</servlet-name>//把类的名称配个短的文字


<servlet-class>com.example.demo3.HelloServlet</servlet-class>//类的名称（路径）   //package com.example.demo3;可以利用包,来知道路径


<servlet-mapping>                              //映射
    <servlet-name>demo1</servlet-name>  //
    <url-pattern>/demo1</url-pattern>       //将来能通过这个路径访问类
</servlet-mapping>

/servlet-class //标签


<servlet>
        <servlet-name>demo1</servlet-name>
        <servlet-class>com.example.demo3.HelloServlet</servlet-class>
        <load-on-startup>5</load-on-startup>
    </servlet>



<servlet-mapping>
    <servlet-name>demo13</servlet-name>
    <url-pattern>demo13</url-pattern>
</servlet-mapping>