Servlet 实现的两种方式实例_tomcat10对应的servlet版本-优快云博客

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Servlet 实现的两种方式实例

只有干货,示例（tomcat10 对应 Servlet 5.0，[Servlet3.0及以后不用配置web.xml] ）：
https://tomcat.apache.org/whichversion.html
在这里插入图片描述

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>登录</title>
</head>
<body>
<h3 align="center">登录</h3>
<hr>
<form action="Servlet01" method="post">
  <div align="center">
  用户名:<input type="text" name="username"/><br>
  口令字:<input type="password" name="password"/><br>
  <input type="submit" />
  </div>
</form>
<hr>
<form action="Servlet02" method="post">
  <div align="center">
    用户名1:<input type="text" name="username1"/><br>
    口令字1:<input type="password" name="password1"/><br>
    <input type="submit" />
  </div>
</form>
</body>
</html>

Servlet01.java

package com.xxx;

import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;

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

@WebServlet(name = "Servlet01", value = "/Servlet01")
public class Servlet01 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        //向服务器发送请求获取到参数
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        response.setHeader("Content-Type", "text/html; charset=UTF-8");
        PrintWriter out=response.getWriter();
        out.write("用户名："+username+"<br>");
        out.write("口令字："+password);
        out.flush();
        out.close();
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request,response);
    }
}

Servlet02.java

package com.yyy;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebServlet;

import java.io.IOException;
import java.io.Writer;

@WebServlet("/Servlet02")
public class Servlet02 implements Servlet{
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
    }

    @Override
    public ServletConfig getServletConfig() {
        return null;
    }

    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        servletRequest.setCharacterEncoding("UTF-8");
        servletResponse.setCharacterEncoding("UTF-8");
        //向服务器发送请求获取到参数
        String username=servletRequest.getParameter("username1");
        String password=servletRequest.getParameter("password1");
        servletResponse.setContentType("text/html; charset=UTF-8");
        Writer out=servletResponse.getWriter();
        out.write("用户名1："+username+"<br>");
        out.write("口令字1："+password);
        out.flush();
        out.close();
    }

    @Override
    public String getServletInfo() {
        return null;
    }

    @Override
    public void destroy() {
    }
}