request请求获取参数的实现方法(post和get两种方式)

2019-11-20 08:51:46

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提交表单代码：

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title></head><body><h1>测试请求参数</h1><!-- 注意href和action都是写的完整的名称:项目名和资源路径名 --><!-- 下面一句是get请求方式并在URL后面传值 --><a href="/Web/AAServlet?xxx=王大炮&yyy=123456">点击这里</a><hr /><form action="/Web/AAServlet" method="post">	用户名:<input type="text" name="username" /><br />	密  码:<input type="password" name="password" /><br />	性  别:<input type="radio" name="sex" checked="checked" value="男">男		 <input type="radio" name="sex" value="女">女<br />	爱  好:<input type="checkbox" name="hobby" value="吃饭" />吃饭		 <input type="checkbox" name="hobby" value="睡觉" />睡觉		 <input type="checkbox" name="hobby" value="打代码" />打代码	<br/>	<input type="submit" value="提交" />	</form></body></html>

Servlet代码：

package request请求获取Post或者get参数;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,			HttpServletResponse response) throws ServletException, 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));				/*		 * 测试获取所有请求参数的名称		 */		Enumeration<?> names2 = request.getParameterNames();		while(names2.hasMoreElements()){			System.out.println(names2.nextElement());		}//		Iterator<String> names = (Iterator<String>) request.getParameterNames();//		while(names.hasNext()){//			System.out.println(names.next());//		}				/*		 * 获取所有请求参数，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));			}		}}

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