package request;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.util.Enumeration;

import java.util.Map;

import java.util.Set;

/**

* @author ： CodeWater

* @create ：2022-03-13-16:20

* @Function Description ：

*/

@WebServlet("/requestDemo06")

public class RequestDemo06 extends HttpServlet {

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

//post获取请求参数

String username = req.getParameter("username");

System.out.println("post");

System.out.println(username);

System.out.println("1-------------------------------2");

//根据参数名称获取参数值的数组

String[] hobbies = req.getParameterValues("hobby");

for (String hobby : hobbies) {

System.out.println(hobby);

}

System.out.println("3-------------------");

//获取所有请求的参数名称

Enumeration<String> parameterNames = req.getParameterNames();

while (parameterNames.hasMoreElements()) {

String name = parameterNames.nextElement();

System.out.println(name);

String value = req.getParameter(name);

System.out.println(value);

}

System.out.println("4--------------------------");

// 获取所有参数的map集合

Map<String, String[]> parameterMap = req.getParameterMap();

Set<String> keyset = parameterMap.keySet();

for (String name : keyset) {

String[] values = parameterMap.get(name);

System.out.println(name);

//值是个数组

for (String value : values) {

System.out.println(value);

}

}

}

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

//get获取请求参数;通用方法，不用写两边用this。doPost

// String username = req.getParameter( "username" );

// System.out.println( "get" );

// System.out.println( username );

this.doPost(req, resp);

}

}