这是网页代码
<%--
Created by IntelliJ IDEA.
User: Limbo
Date: 2017/8/21
Time: 9:55
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/SV" method="post">
输入姓名<input type="text" id="username">
输入密码<input type="password" name="" id="userpsd">
<input type="submit" value="提交">
</form>
</body>
</html>
这是Servlet代码
package com.limbo.servlet;
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.io.PrintWriter;
@WebServlet(name = "MyServlet",urlPatterns = "/SV")
public class MyServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.service(req, resp);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("这是Servlet");
response.setContentType("text/htmml;charset=utf-8");
// PrintWriter out = response.getWriter();
// out.println(",欢迎登陆成功</h2>");
// response.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
String psd = request.getParameter("userpsd");
if (username != null && !"".equals(username) && psd != null && !"".equals(psd)) {
if (username.equals("admin") && psd.equals("123")) {
PrintWriter out = response.getWriter();
out.print("<h2>" + username);
out.println(",欢迎登陆成功</h2>");
} else {
// response.sendRedirect("index.jsp");
PrintWriter out = response.getWriter();
out.print("<h2>" + username);
out.println(",欢迎登陆成功</h2>");
}
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
输入名字密码后就是空白页面，地址栏地址会变成localhost:8080/SV
https://jingyan.baidu.com/article/f25ef254ad2ca1482c1b8229.html