jsp和servlet 簡單登入介面(不串連資料庫)

最後更新：2014-12-25 來源：互聯網

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標籤：串連資料庫初學者

1、首先說明一點，雖然很簡單但是對於初學者這個jsp和servlet的連結我搗鼓了半天才算弄明白

jsp將請求提交到一個url，然後servlet擷取也從這個url中擷取請求的資料，兩者的連結就在那個url

jsp中的代碼

檔案名稱：login.jsp

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

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

</head>

<body>

使用者：<input type="text" name="username" value="wangmin"/><br/>

密碼：<input type="password" name="password" value="wangmin"/><br/>

</form> aaaa

</body>

</html>

servlet中的代碼

檔案名稱：LoginServlet.java

package my.experience.login;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet{

//重寫doGet方法

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,

IOException {

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

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

//伺服器端列印資訊

System.out.println("username=" + username);

System.out.println("password=" + password);

//設定編碼格式

response.setContentType("text/html;charset=GB18030");

//返回html頁面

response.getWriter().println("<html>");

response.getWriter().println("<head>");

response.getWriter().println("<title>登入資訊</title>");

response.getWriter().println("</head>");

response.getWriter().println("<body>");

response.getWriter().println("歡迎【" + username + "】使用者登入成功！！！");

response.getWriter().println("</body>");

response.getWriter().println("</html>");

}

//重寫doPost方法

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,

IOException {

doGet(request, response);

}

在web.xml中一定要寫對 url,要不然找不到

<?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_2_5.xsd" id="WebApp_ID" version="2.5">

<display-name>MyExperience</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-name>LoginServlet</servlet-name>

<servlet-class>my.experience.login.LoginServlet</servlet-class>//包名+類名

</servlet>

<servlet-mapping>

<servlet-name>LoginServlet</servlet-name>

<url-pattern>/loginServlet/LoginServlet</url-pattern> 對應的jsp中的action

</servlet-mapping>

</web-app>

然後啟Tomacat,在瀏覽器中輸入http://localhost:80/login.jsp就ok

本文出自 “autoComplete” 部落格，請務必保留此出處http://7129486.blog.51cto.com/7119486/1595806

jsp和servlet 簡單登入介面(不串連資料庫)

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