java代码
package com.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet{
public void service(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
req.setCharacterEncoding("UTF-8");
rsp.setContentType("text/html; charset=UTF-8");
PrintWriter pw = rsp.getWriter();
String username = req.getParameter("usename");
String password = req.getParameter("password");
String uname = "张三";
String pword = "123";
if(username==null && password==null) {
pw.write("密码、账号不能为空");
}else {
if(username.equals(uname)) {
if(password.equals(pword)) {
pw.write("登录成功");
}else {
pw.write("密码错误");
}
}else {
pw.write("账号错误");
}
}
}
}
web.xml代码
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.servlets.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/login.do</url-pattern>
</servlet-mapping>
</web-app>
html代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
</head>
<body>
<form action="login.do">
用户名:<input type="text" name="usename"/><br>
密码:<input type="password" name="password"/><br>
<input type="submit" value="登录"/>
</form>
</body>
</html>
