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java简单案例：servlet登录

2020-06-30 09:30 55 查看

Tomcat简易登录注册

  • 登录功能

    • 前言

    暑期实习第二课，用web做一个简单的登录注册

    简易实现Hello servlet

    package com.wdd0629.servlet;

import javax.servlet.*;
import java.io.IOException;

public class HelloServlet implements Servlet {

@Override
public void init(ServletConfig servletConfig) throws ServletException {

}

@Override
public ServletConfig getServletConfig() {
return null;
}

@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
servletResponse.getWriter().write("hello,servlet");
}

@Override
public String getServletInfo() {
return null;
}

@Override
public void destroy() {

}
}

    配置web

    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>helloServlet</servlet-name>
<servlet-class>com.wdd0629.servlet.HelloServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>helloServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>

</web-app>

    运行结果

    在浏览器输入地址：http://localhost:8081/hello

    登录功能

    package com.wdd0629.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginServlet extends HttpServlet {

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String name=req.getParameter("name");
String password=req.getParameter("password");

if (name.equals("123")&&password.equals("123")) {
resp.getWriter().write("success");
} else {
resp.getWriter().write("failed");
}

}

}

    编写index.jsp

    <%--
Created by IntelliJ IDEA.
User: 荍三岁
Date: 2020/6/29
Time: 10:15
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="/login" method="post">
name:<input name="name" type="text">
password:<input name="password" type="password">
<input type="submit" value="login">
</form>
</body>
</html>

    配置web

    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.wdd0629.servlet.LoginServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>

</web-app>

    运行结果

    用户名：123 密码：123

    密码输入正确后

    密码输入错误后

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