JavaWeb-利用HttpServletRequest获取参数值

利用HttpServletRequest获取参数值

---

ReqDemo.java

package com.xieth.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Map;
import java.util.Map.Entry;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ReqDemo extends HttpServlet {

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

        resp.setContentType("text/html;charset=gb2312");
        PrintWriter out = resp.getWriter();
        Enumeration<String> enumeration = req.getParameterNames();
        while (enumeration.hasMoreElements()) {
            String name = enumeration.nextElement();
            String value = req.getParameter(name);
            out.println("<h2>" + name + ":" + value + "</h2>");
        }

        Map<String, String[]> map = req.getParameterMap();  //获取Map集合
        for (Entry<String, String[]> entry : map.entrySet()) {
            out.println("<h1>" + entry.getKey() + "->"
                    + Arrays.asList(entry.getValue()) + "</h1>");
        }
        out.close();
    }

}

login.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="ReqDemo">
        account: <input type="text" name="account"> password: <input
            type="password" name="password"> <input type="checkbox"
            name="in" value="shopping"> shopping <input type="checkbox"
            name="in" value="dance"> dance <input type="checkbox"
            name="in" value="ball"> ball <input type="checkbox" name="in"
            value="sing"> sing <input type="checkbox" name="in"
            value="sport"> sport <input type="submit" value="submit">
    </form>
</body>
</html>

运行结果:

---