测试请求参数

<form action="/Web/AAServlet" method="post">
用户名:

密 码:

性 别:<input type="radio" name="sex" checked="checked" value="男">男
<input type="radio" name="sex" value="女">女

爱 好:吃饭

import java.io.IOException;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/*

• 演示request获取请求参数
  */
  @WebServlet("/AAServlet")
  public class AAServlet extends HttpServlet {
  private static final long serialVersionUID = 1L;

  protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
  System.out.println("get:"+request.getParameter("xxx"));
  System.out.println("get:"+request.getParameter("yyy"));
  }

  protected void doPost(HttpServletRequest request,IOException {

   request.setCharacterEncoding("utf-8");
   response.setContentType("text/html;charset=utf-8");
  
   String username = request.getParameter("username");
   String password = request.getParameter("password");
   String[] hobby = request.getParameterValues("hobby");
  
   System.out.println(username+","+password+","+Arrays.toString(hobby));
  
   /*
    * 测试<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>所有请求参数的<a href="https://www.jb51.cc/tag/mingcheng/" target="_blank" class="keywords">名称</a>
    */
   Enumeration<?> names2 = request.getParameterNames();
   while(names2.hasMoreElements()){
       System.out.println(names2.nextElement());
   }

  // Iterator names = (Iterator) request.getParameterNames();
  // while(names.hasNext()){
  // System.out.println(names.next());
  // }

   /*
    * <a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>所有请求参数，封装到Map中
    */
       Map<String,String[]> map = (Map<String,String[]>)request.getParameterMap();
       for(String name:map.keySet()){
           String[] values = map.get(name);
           System.out.println(name+"="+Arrays.toString(values));
       }
   }

}