request通用的代码
import java.io.BufferedReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Map;
import java.util.Set;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class RequestDemo6
*/
@WebServlet("/requestDemo7")
public class RequestDemo7 extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public RequestDemo7() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//get 获取请求参数
// 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);
// }
//获取所有请求的参数名称
// Enumeration<String> parameterNames = request.getParameterNames();
// while(parameterNames.hasMoreElements()) {
// String name = parameterNames.nextElement();//获取参数名
// System.out.println(name);
// String value = request.getParameter(name);//通过参数名获取参数值
// System.out.println(value);
// System.out.println("-----------");
// }
//获取所有参数的Map集合 为了防止复选框获取不到其他值的情况
Map<String, String[]> parameterMap = request.getParameterMap();
//遍历
Set<String> keyset = parameterMap.keySet();
for (String name : keyset) {
//根据键获取值
String[] values = parameterMap.get(name);
System.out.println(name);
for (String value : values) {
System.out.println(value);
}
System.out.println("---------");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//post 获取请求参数
// String username = request.getParameter("username");
// System.out.println("post");
// System.out.println(username);
this.doGet(request, response);
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注册页面</title>
</head>
<body>
<form action="requestDemo7" method="get">
<input type="text" placeholder="请输入用户名" name="username"><br>
<input type="text" placeholder="请输入密码" name="password"><br>
<input type="checkbox" name="hobby" value="game">游戏
<input type="checkbox" name="hobby" value="study">学习<br>
<input type="submit" value="注册">
</form>
</body>
</html>
