HttpServletRequest获取提交表单参数的方法

17-11-16 来源：[db:作者]
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(一)代码演示
HttpServletRequest的方法：
<!DOCTYPE html>
<html>
<head>
<meta  http-equiv="Content-Type" content="text/html" charset="UTF-8">
<title>演示01</title>
</head>
<body>
<form  action="/Project01/DemoServlet" method="post"> 
用户名：<input  type="text"  name="username"><br/>
密&nbsp;&nbsp;码：<input  type="password"  name="password"><br/>
爱好：<input  type="checkbox"  name="hobby" value="sing">唱歌 
<input  type="checkbox"  name="hobby" value="dance">跳舞 
<input  type="checkbox"  name="hobby" value="football">足球 <br>
<input type="submit" value="提交">
</form>
</body>
</html>


----------
package com.demo;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DemoServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

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

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

        String name = request.getParameter("username");
        String password = request.getParameter("password");
        PrintWriter out = response.getWriter();
        out.println("用户名：" + name);
        out.println("密码：" + password);
        String[] hobbys = request.getParameterValues("hobby");
        for (int i = 0; i < hobbys.length; i++) {
            out.println(hobbys[i] );
        }

    }
}


----------
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Project01</display-name>
  <servlet>
      <!-- servlet-name名任意取 -->
      <servlet-name>demo</servlet-name>
      <!--servlet-class填写(包名.类名)  -->
      <servlet-class>com.demo.DemoServlet</servlet-class>

  </servlet>
  <servlet-mapping>
      <servlet-name>demo</servlet-name>
      <!-- Servlet的多重映射 -->
      <url-pattern>/DemoServlet</url-pattern>


  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>

  </welcome-file-list>
</web-app>
(二)结果演示
这里写图片描述
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