requset获取post提交的请求参数

1.请求体的内容通常是通过post来提交的，格式是

username=zhansan&password=123&hobby=football||&hobby=basketball

key--------------------------------value

username [zhangsan]

password [123]

hobby [football,basketball]

2.定义和用法

// 1.获取单个表单中的value值
        String usernam = request.getParameter("usernam");
        String password = request.getParameter("password");
// 2.获取多个表单的value值
        String[] parameterValues = request.getParameterValues("hobby");
        System.out.print("hobby.values:");
// 3.获得所有参数的name
            Enumeration<String> parameterNames = request.getParameterNames();
            for (String string2 : parameterValues) {
                System.out.println(parameterNames.nextElement());

            }

// 4.将获得的所有参数封装到一个Map<String,String[]>
    Map<String, String[]> parameterMap = request.getParameterMap();
        for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
            System.out.println(entry.getKey());
            for (String string : entry.getValue()) {
                System.out.println(string);
            }
            System.out.println("----------------");
        }

3.实例结果

4.完整代码

package com.hdh.requesd;

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;

public class ContentServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // 1.获取单个表单中的value值
        String usernam = request.getParameter("usernam");
        String password = request.getParameter("password");
        System.out.println("usernam.value:" + usernam);
        System.out.println("password.value:" + password);
        // 2.获取多个表单的value值
        String[] parameterValues = request.getParameterValues("hobby");
        System.out.print("hobby.values:");
        for (String string : parameterValues) {
            System.err.print(string + "  ");
        }
        System.out.println("---------------------");
        // 3.获得所有参数的name
        Enumeration<String> parameterNames = request.getParameterNames();
        for (String string2 : parameterValues) {
            System.out.println(parameterNames.nextElement());

        }
        System.out.println("---------------------");
        // 4.将获得的所有参数封装到一个Map<String,String[]>中
        Map<String, String[]> parameterMap = request.getParameterMap();
        for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
            System.out.println(entry.getKey());
            for (String string : entry.getValue()) {
                System.out.println(string);
            }
            System.out.println("----------------");
        }
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

}

form.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>   
    <hr>
    <form action="/WEB15/content" method="post">
    姓名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    <input type="checkbox" name="hobby" value="zq">足球
    <input type="checkbox" name="hobby" value="lq">篮球
    <input type="checkbox" name="hobby" value="ppq">乒乓球
    <input type="submit" value="提交">
    </form>
</body>
</html>

requset获取post提交的请求参数

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