request对象获取请求参数

package com.tedu.request;

import java.io.IOException;

import java.util.Enumeration;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.tribes.util.Arrays;

/**

 * request对象获取请求参数

 */

public class RequestDemo2

extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(

HttpServletRequest request,

HttpServletResponse response)

throws ServletException,

IOException {

// 1.getParameter()

String username = request

.getParameter(

"username");

System.out.println("username: "

+ username);

String like = request

.getParameter("like");

System.out.println(

"like: " + like);

// 2.getParameterValues()

String[] likes = request

.getParameterValues(

"like");

System.out.println(

Arrays.toString(likes));

// 3.getParameterMap()

Map<String, String[]> map = request

.getParameterMap();

System.out.println(map);

// 4.getParameterNames();

Enumeration<String> names = request

.getParameterNames();

while (names.hasMoreElements()) {

String name = names

.nextElement();//参数名

String value = request

.getParameter(name);//参数值

System.out.println(name

+ " : " + value);

}

}

protected void doPost(

HttpServletRequest request,

HttpServletResponse response)

throws ServletException,

IOException {

doGet(request, response);

}

}