/*以流的形式获取请求参数*/_拦截器以字节流的形式接收参数-优快云博客

本文链接：https://blog.youkuaiyun.com/wangyanming123/article/details/52372262

本文介绍了一种通过ServletInputStream从HTTP请求中读取原始字节流的方法，并展示了如何使用这种方式处理POST请求中的数据。

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RequestDemo5.java文件

package com.neu;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/*以流的形式获取请求参数*/
//一般情况下不使用，文件上传时有时用
public class RequestDemo5 extends HttpServlet {

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

        ServletInputStream in = request.getInputStream();
        int len = -1;
        byte b[] = new byte[1024];
        while((len=in.read(b)) != -1){
            System.out.println(new String(b,0,len));
        }
        in.close();
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
    }

}

index.jsp文件：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
  <head>
    <title>注册页面</title>
  </head>

 <body>
    <form action="/Request/servlet/RequestDemo4" method="post">
        用户名：<input type="text" name="username"/><br/>
        密码：<input type="password" name="password"/><br/>
        确认密码：<input type="password" name="password"/><br/>
        <input type="submit" value="注册"/>
    </form>
  </body>

</html>

运行：
http://localhost:8080/Request/
运行结果：
封装前：User [username=null, password=null, gender=null]
封装后：User [username=ttt, password=[444, 666], gender=null]