Request_获取请求参数通用方式介绍
1.其他功能：
1.获取请求参数通用方式：不论get还是post请求方式都可以使用下列方法来获取请求参数
1.String getParameter（String name）：根据参数名称获取参数值 username=zs&password=123
2.String [] getParameterValues(String name):根据参数名称获取参数值的数组 hobby=xx&hobby=game
3.Enumration<String> getParmeterNames():获取所有请求的参数名称
4.Map<String ,String []> getParameterMap():获取所有参数的map集合
2.请求转发：
3.共享数据：
4.获取ServletContext
Request_获取请求参数通用方式演示
1.String getParameter（String name）：根据参数名称获取参数值 username=zs&password=123
2.String [] getParameterValues(String name):根据参数名称获取参数值的数组 hobby=xx&hobby=game
3.Enumration<String> getParmeterNames():获取所有请求的参数名称
4.Map<String ,String []> getParameterMap():获取所有参数的map集合
RequestDemo6
package com.example.day14_servlethttprequest.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;
@WebServlet("/requestDemo6")
public class RequestDemo6 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//post获取请求参数
//根据参数名称获取参数值
String username = request.getParameter("username");
/*System.out.println("get");
System.out.println(username);*/
//根据参数名称获取参数值的数组
String[] hobbies = request.getParameterValues("hobby");
/* for (String hobby:hobbies) {
System.out.println(hobby);
}*/
//获取所以请求的参数名称
Enumeration<String> names = request.getParameterNames();
/* while (names.hasMoreElements()){
String s = names.nextElement();
System.out.println(s);
String parameter = request.getParameter(s);
System.out.println(parameter);
System.out.println("*********************");
}*/
//获取所有参数的map集合
Map<String, String[]> parameterMap = request.getParameterMap();
//遍历
Set<String> keyset = parameterMap.keySet();
for (String key :keyset){
//获取键获取值
String[] values = parameterMap.get(key);
System.out.println(key);
for (String value:values) {
System.out.println(value);
}
System.out.println("*************************");
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//get 获取请求参数
/* //根据参数名称获取参数值
String username = request.getParameter("username");
System.out.println("post");
System.out.println(username);*/
this.doPost(request,response);
}
}
regist2.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册页面</title>
</head>
<body>
<form action="requestDemo6" method="get">
<input type="text" placeholder="请输入账号" name="username"><br>
<input type="text" placeholder="请输入密码" name="password"><br>
<input type="checkbox" name="hobby" value="篮球">篮球
<input type="checkbox" name="hobby" value="rap">rap
<br>
<input type="submit"value="注册">
</form>
</body>
</html>
标签：请求,Request,System,获取,参数,println,out,String From： https://www.cnblogs.com/x3449/p/17076349.html