request请求操作参数_return request({-优快云博客

本文链接：https://blog.youkuaiyun.com/My_____Dream/article/details/79734592

这篇博客介绍了如何在Java Servlet中处理HTTP请求参数，包括获取单个参数值、多个参数值以及所有参数的方法。示例代码展示了从request对象中获取username和hobby参数的详细步骤。

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操作请求参数

username=tom&password=123&hobby=drink&hobby=sleep

常用方法:

           String getParameter(String key):获取一个值
           String[] getParameterValues(String key):通过一个key获取多个值
           Map<String,String[]> getParameterMap():获取所有的参数名称和值

代码：

package com.feizhu._response_f_param;

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

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

/**
* 获取请求参数
*/
public class ParamServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;


   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       //获取username

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

          System.out.println("username"+username);
       //获取爱好多个值

          String [] hobby=request.getParameterValues("hobby");

          System.out.println("hobby:"+Arrays.toString(hobby));
       //获取所有
       System.out.println("--------");
       Map<String,String[]> map =request.getParameterMap();
       for(String key:map.keySet()) {
           System.out.println(key+"::"+Arrays.toString(map.get(key)));
       }
   }

   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // TODO Auto-generated method stub
       doGet(request, response);
   }

}