ServletConfig实现简单的登录操作
2015-10-29 21:56
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=============================Servlet代码=============================
package com.lovo.servlet;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author Brittany ln
*
*/
public class login extends HttpServlet{
//重写doGet和doPost方法
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/plain;charset=utf-8");//设置编码类型
String name = req.getParameter("username1");//获得响应的名称
String pwd = req.getParameter("pwd"); //获得响应的密码
ServletConfig sc = getServletConfig(); //得到ServletConfig对象
String Oldname = sc.getInitParameter("username1"); //获得xml文件中设置的名称
String Oldpwd = sc.getInitParameter("pwd");//获得xml文件中设置的密码
if(name.equals(Oldname) && pwd.equals(Oldpwd)){ //判断响应的名称和密码是否和文件中存储的一样
resp.getWriter().print("登录成功！！！！");
}else{
resp.getWriter().print("登录失败！！！！");
}
resp.getWriter().close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
}
=============================Html代码=============================
<!DOCTYPE html>
<html>
<head>
<title>login.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body>
<form action="/JustPlain/login" method="get"> <!-- 设置servlet的映射路径，设置获取方式 get -->
用户名:<input type="text" name="username1"/><br/><br/>
密 码:<input type="password" name="pwd"/><br/><br/>
<input type="submit" value="登录"/>
</form>
</body>
</html>
=============================XML配置文件=============================
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>conf</servlet-name> <!-- 设置servlet名称 -->
<servlet-class>com.lovo.servlet.ConfigServlet</servlet-class> <!-- 设置servlet文件路径 -->
<init-param> <!-- 设置servlet初始化参数 -->
<param-name>username</param-name> <!-- 设置初始化参数名称 -->
<param-value>xiaoming</param-value> <!-- 设置初始化参数值 -->
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>conf</servlet-name>
<url-pattern>/conf</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>cont</servlet-name>
<servlet-class>com.lovo.servlet.ContextServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>cont</servlet-name>
<url-pattern>/cont</url-pattern>
</servlet-mapping>
<context-param>
<param-name>username</param-name>
<param-value>xiaoming24dsse</param-value>
</context-param>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.lovo.servlet.login</servlet-class>
<init-param>
<param-name>username1</param-name>
<param-value>xiaoming</param-value>
</init-param>
<init-param>
<param-name>pwd</param-name>
<param-value>12345</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>
=============================界面显示=============================
package com.lovo.servlet;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author Brittany ln
*
*/
public class login extends HttpServlet{
//重写doGet和doPost方法
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/plain;charset=utf-8");//设置编码类型
String name = req.getParameter("username1");//获得响应的名称
String pwd = req.getParameter("pwd"); //获得响应的密码
ServletConfig sc = getServletConfig(); //得到ServletConfig对象
String Oldname = sc.getInitParameter("username1"); //获得xml文件中设置的名称
String Oldpwd = sc.getInitParameter("pwd");//获得xml文件中设置的密码
if(name.equals(Oldname) && pwd.equals(Oldpwd)){ //判断响应的名称和密码是否和文件中存储的一样
resp.getWriter().print("登录成功！！！！");
}else{
resp.getWriter().print("登录失败！！！！");
}
resp.getWriter().close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
}
=============================Html代码=============================
<!DOCTYPE html>
<html>
<head>
<title>login.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body>
<form action="/JustPlain/login" method="get"> <!-- 设置servlet的映射路径，设置获取方式 get -->
用户名:<input type="text" name="username1"/><br/><br/>
密 码:<input type="password" name="pwd"/><br/><br/>
<input type="submit" value="登录"/>
</form>
</body>
</html>
=============================XML配置文件=============================
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>conf</servlet-name> <!-- 设置servlet名称 -->
<servlet-class>com.lovo.servlet.ConfigServlet</servlet-class> <!-- 设置servlet文件路径 -->
<init-param> <!-- 设置servlet初始化参数 -->
<param-name>username</param-name> <!-- 设置初始化参数名称 -->
<param-value>xiaoming</param-value> <!-- 设置初始化参数值 -->
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>conf</servlet-name>
<url-pattern>/conf</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>cont</servlet-name>
<servlet-class>com.lovo.servlet.ContextServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>cont</servlet-name>
<url-pattern>/cont</url-pattern>
</servlet-mapping>
<context-param>
<param-name>username</param-name>
<param-value>xiaoming24dsse</param-value>
</context-param>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.lovo.servlet.login</servlet-class>
<init-param>
<param-name>username1</param-name>
<param-value>xiaoming</param-value>
</init-param>
<init-param>
<param-name>pwd</param-name>
<param-value>12345</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>
=============================界面显示=============================
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