HttpServletRequest
HttpServletRequest代表客户端的请求，用户通过Http协议访问服务器，HTTP请求中的所有信息会被封装到HttpServletRequest，通过这个HttpServletRequest的方法，获得客户端的所有信息
1.获取前端传递的参数,请求转发
package com
.weng
.servlet
;
import javax
.servlet
.ServletException
;
import javax
.servlet
.http
.HttpServlet
;
import javax
.servlet
.http
.HttpServletRequest
;
import javax
.servlet
.http
.HttpServletResponse
;
import java
.io
.IOException
;
import java
.util
.Arrays
;
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req
, HttpServletResponse resp
) throws ServletException
, IOException
{
req
.setCharacterEncoding("utf-8");
resp
.setCharacterEncoding("utf-8");
String username
= req
.getParameter("username");
String password
= req
.getParameter("password");
String
[] hobbys
= req
.getParameterValues("hobbys");
System
.out
.println("=============================");
System
.out
.println(username
);
System
.out
.println(password
);
System
.out
.println(Arrays
.toString(hobbys
));
System
.out
.println("=============================");
System
.out
.println(req
.getContextPath());
req
.getRequestDispatcher("/request_war/success.jsp").forward(req
,resp
);
}
@Override
protected void doPost(HttpServletRequest req
, HttpServletResponse resp
) throws ServletException
, IOException
{
doGet(req
, resp
);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0"
metadata-complete="true">
<servlet>
<servlet-name>LoginServlet
</servlet-name>
<servlet-class>com.weng.servlet.LoginServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet
</servlet-name>
<url-pattern>/login
</url-pattern>
</servlet-mapping>
</web-app>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录</title>
</head>
<body>
<h1>登录</h1>
<div>
<%--这里表单表示的意思:以post方式提交表单，提交到我们的Login请求--%>
<form action="${pageContext.request.contextPath}/login" method="post">
用户名: <input type="text" name="username"> <br>
密码:<input type="password" name="password"> <br>
爱好:
<input type="checkbox" name="hobbys" value="女孩">女孩
<input type="checkbox" name="hobbys" value="代码">代码
<input type="checkbox" name="hobbys" value="唱歌">唱歌
<input type="checkbox" name="hobbys" value="电影">电影
<br>
<input type="submit">
</form>
</div>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>登录成功</h1>
</body>
</html>
