JAVA EE：第一个例子（登录）

时间：2023-03-08 23:04:08
JAVA EE：第一个例子（登录）
名称 代码 说明
web.xml配置文件 
<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

    id="WebApp_ID" version="3.0">

    <display-name>hello</display-name>

    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

        <welcome-file>index.htm</welcome-file>

        <welcome-file>index.jsp</welcome-file>

        <welcome-file>default.html</welcome-file>

        <welcome-file>default.htm</welcome-file>

        <welcome-file>default.jsp</welcome-file>

    </welcome-file-list>

    <servlet>

        <servlet-name>dispatcher</servlet-name>

        <servlet-class>mypack.DispatcherServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>dispatcher</servlet-name>

        <url-pattern>/dispatcher</url-pattern>

    </servlet-mapping>

</web-app>
  
servlet类 
package mypack;

import javax.servlet.*;

import java.io.*;

public class DispatcherServlet extends GenericServlet

{

    private static final long serialVersionUID = -927664542385240618L;

    private String target="/hello.jsp";

    public void service(ServletRequest request,ServletResponse response)throws ServletException,IOException{

        String username=request.getParameter("username");

        String password=request.getParameter("password");

        request.setAttribute("USER", username);

        request.setAttribute("PASSWORD", password);

        ServletContext context=getServletContext();

        RequestDispatcher dispatcher=context.getRequestDispatcher(target);

        dispatcher.forward(request, response);

    }

}
  
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 name="loginForm" method="POST" action="dispatcher">

        <table>

            <tr>

                <td><div align="right">User Name:</div></td>

                <td><input type="text" name="username"></td>

            </tr>

            <tr>

                <td><div align="right">password</div></td>

                <td><input type="text" name="password"></td>

            </tr>

            <tr>

                <td><input type="submit" name="submit" value="submit"></td>

                <td><input type="reset" name="reset" value="reset"></td>

            </tr>

        </table>

    </form>

</body>

</html>
  
hello.jsp 
<%@ page language="java" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<!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>

    hello:<%=request.getAttribute("USER")%>

</body>

</html>
  

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