1. request对象

在Servlet中用来处理客户端请求需要用doGet或doPost方法的request对象

1.1 get和post区别

1.2 request主要方法

1.2.1 get方法

package com.qf.servlet2;

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(value = "/rs")
public class RegisterServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取用户请求发送的数据
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        System.out.println("提交的数据： " + username + "\t" + password);
    }
}

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
</head>
<body>
    <form action="/Webproject_war_exploded/rs" method="get">
        用户名:<input type="text" name="username"/><br/>
        密码：<input type="password" name="password"/><br/>
        <input type="submit" value="注册"/>
    </form>

</body>
</html>

1.2.2 Post方法

package com.qf.servlet2;

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(value = "/rs")
public class RegisterServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取用户请求发送的数据
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        System.out.println("提交的数据： " + username + "\t" + password);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取用户请求发送的数据
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        System.out.println("提交的数据： " + username + "\t" + password);
    }
}

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
</head>
<body>
    <form action="/Webproject_war_exploded/rs" method="post">
        用户名:<input type="text" name="username"/><br/>
        密码：<input type="password" name="password"/><br/>
        <input type="submit" value="注册"/>
    </form>

</body>
</html>