Request_获取请求体数据

       3. 获取请求体数据:
           * 请求体：只有POST请求方式，才有请求体，在请求体中封装了POST请求的请求参数
           * 步骤：
               1. 获取流对象
                   * BufferedReader getReader()：获取字符输入流，只能操作字符数据
                   * ServletInputStream getInputStream()：获取字节输入流，可以操作所有类型数据
                       * 在文件上传知识点后讲解

2. 再从流对象中拿数据

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
</head>
<body>

    <form action="/day12/requestDemo5" method="post">
        <input type="text" placeholder="请输入用户名" name="username"><br>
        <input type="text" placeholder="请输入密码" name="password"><br>
        <input type="submit" value="注册">

    </form>

</body>
</html>

package com.learn.web.request;

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.BufferedReader;
import java.io.IOException;

@WebServlet("/requestDemo5")
public class RequestDemo5 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //获取请求消息体--请求参数

        //1.获取字符流
        BufferedReader br = request.getReader();
        //2.读取数据
        String line = null;
        while((line = br.readLine()) != null){
            System.out.println(line);
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
    }
}

原文链接：https://blog.csdn.net/Leon_Jinhai_Sun/article/details/103216780