获取请求体数据:

请求体:只有POST请求方式，才请求体，在请求体中封装了POST请求的请求参数；
步骤:

获取流对象

BufferedReader getReader() :获取字符输入流，只能操作字符数据
Servlet Inputstream get Inputstream() :获取字节输入流，可以操作所有类型数据

再从流对象中个数据

举例：

regist.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
</head>
<body>
    <form action="/requestbody" method="post">
        <input type="text" name="username" placeholder="请输入用户名"><br>
        <input type="password" name="password" placeholder="请输入密码"><br>
        <input type="submit" value="注册">
    </form>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
</head>
<body>
    <form action="/requestbody" method="post">
        <input type="text" name="username" placeholder="请输入用户名"><br>
        <input type="password" name="password" placeholder="请输入密码"><br>
        <input type="submit" value="注册">
    </form>
</body>
</html>

servlet:

@WebServlet("/requestbody")
public class requestDemo 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 {

    }
}

提交数据，显示：在这里插入图片描述

原文链接：https://blog.csdn.net/qq_43472877/article/details/106406831