欧美一级特黄大片做受成人-亚洲成人一区二区电影-激情熟女一区二区三区-日韩专区欧美专区国产专区

JavaWeb過濾器詳解

過濾器是什么玩意？

讓客戶滿意是我們工作的目標，不斷超越客戶的期望值來自于我們對這個行業(yè)的熱愛。我們立志把好的技術(shù)通過有效、簡單的方式提供給客戶，將通過不懈努力成為客戶在信息化領(lǐng)域值得信任、有價值的長期合作伙伴，公司提供的服務項目有：主機域名、虛擬空間、營銷軟件、網(wǎng)站建設(shè)、渭源網(wǎng)站維護、網(wǎng)站推廣。

所謂過濾器，其實就是一個服務端組件，用來截取用戶端的請求與響應信息。

過濾器的應用場景：
1.對用戶請求進行統(tǒng)一認證，保證不會出現(xiàn)用戶賬戶安全性問題

2.編碼轉(zhuǎn)換，可在服務端的過濾器中設(shè)置統(tǒng)一的編碼格式，避免出現(xiàn)亂碼

3.對用戶發(fā)送的數(shù)據(jù)進行過濾替換

4.轉(zhuǎn)換圖像格式

5.對響應的內(nèi)容進行壓縮

其中，第1,2場景經(jīng)常涉及。

Java Web過濾器詳解

login.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">
  
  <title>My JSP 'login.jsp' starting page</title>
  
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">  
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->

 </head>
 
 <body>
 <form action="<%=path %>/servlet/LoginServlet" method="post" >
  用戶名:<input type="text" name="username" />
 密碼:<input type="password" name="password" />
 <input type="submit" value="登錄" />
 </form>
 </body>
</html>

success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">
  
  <title>My JSP 'index.jsp' starting page</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">  
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->
 </head>
 
 <body>
  
 </body>
</html>

failure.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">
  
  <title>My JSP 'login.jsp' starting page</title>
  
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">  
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->

 </head>
 
 <body>
 登錄失敗，請檢查用戶名或密碼！
 </body>
</html>

LoginFilter.java

package com.cityhuntshou.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter {
  private FilterConfig config;
  public void destroy() {
    

  }

  public void doFilter(ServletRequest arg0, ServletResponse arg1,
      FilterChain arg2) throws IOException, ServletException {
    HttpServletRequest request = (HttpServletRequest) arg0;
    HttpServletResponse response = (HttpServletResponse) arg1;
    HttpSession session = request.getSession();
    
    
    //過濾器實際應用場景之二-----編碼轉(zhuǎn)換
    
    String charset = config.getInitParameter("charset");
    
    if(charset == null)
    {
      charset = "UTF-8";
    }
    
    request.setCharacterEncoding(charset);
    
    String noLoginPaths = config.getInitParameter("noLoginPaths");
    
    
    
    if(noLoginPaths != null)
    {
    String[] strArray = noLoginPaths.split(";");
    for(int i = 0; i < strArray.length; i++)
    {
      //空元素，放行
      if(strArray[i] == null || "".equals(strArray[i]))
        continue;
        
      if(request.getRequestURI().indexOf(strArray[i]) != -1)
      {
      arg2.doFilter(arg0, arg1);
      return;
      }
    }
    }
    if(request.getRequestURI().indexOf("login.jsp") != -1
        || request.getRequestURI().indexOf("LoginServlet") != -1)
    {
      arg2.doFilter(arg0, arg1);
      return;
    }
    
    if(session.getAttribute("username") != null)
    {
      arg2.doFilter(arg0, arg1);
    }
    else 
    {
      response.sendRedirect("login.jsp");
    }
  }

  public void init(FilterConfig arg0) throws ServletException {
    config = arg0;

  }

}

LoginServlet.java

package com.cityhuntshou.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginServlet extends HttpServlet {

  /**
   * Constructor of the object.
   */
  public LoginServlet() {
    super();
  }

  /**
   * Destruction of the servlet. <br>
   */
  public void destroy() {
    super.destroy(); // Just puts "destroy" string in log
    // Put your code here
  }

  /**
   * The doGet method of the servlet. <br>
   *
   * This method is called when a form has its tag value method equals to get.
   * 
   * @param request the request send by the client to the server
   * @param response the response send by the server to the client
   * @throws ServletException if an error occurred
   * @throws IOException if an error occurred
   */
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {

    
  }

  /**
   * The doPost method of the servlet. <br>
   *
   * This method is called when a form has its tag value method equals to post.
   * 
   * @param request the request send by the client to the server
   * @param response the response send by the server to the client
   * @throws ServletException if an error occurred
   * @throws IOException if an error occurred
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {

    String username = request.getParameter("username");
    String password = request.getParameter("password");
    //new String(username.getBytes("ISO-8859-1"),"UTF-8")
    System.out.println(username);
    if("admin".equals(username) && "admin".equals(password))
    {
      //校驗通過
      HttpSession session = request.getSession();
      session.setAttribute("username", username);
      response.sendRedirect(request.getContextPath()+"/success.jsp");
    }
    else 
    {
      //校驗失敗
      response.sendRedirect(request.getContextPath()+"/failure.jsp");
    }
  }

  /**
   * Initialization of the servlet. <br>
   *
   * @throws ServletException if an error occurs
   */
  public void init() throws ServletException {
    // Put your code here
  }

}

web.xml

<?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>
 <servlet>
  <description>This is the description of my J2EE component</description>
  <display-name>This is the display name of my J2EE component</display-name>
  <servlet-name>LoginServlet</servlet-name>
  <servlet-class>com.cityhuntshou.servlet.LoginServlet</servlet-class>
 </servlet>

 <servlet-mapping>
  <servlet-name>LoginServlet</servlet-name>
  <url-pattern>/servlet/LoginServlet</url-pattern>
 </servlet-mapping>  
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
  <filter>
    <filter-name>LoginFilter</filter-name>
    <filter-class>com.cityhuntshou.filter.LoginFilter</filter-class>
    <init-param>
      <param-name>noLoginPaths</param-name>
      <param-value>login.jsp;failure.jsp;loginServlet</param-value>
    </init-param>
    <init-param>
      <param-name>charset</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

運行效果：

Java Web過濾器詳解

Java Web過濾器詳解

Java Web過濾器詳解

Java Web過濾器詳解

訪問結(jié)果：

Java Web過濾器詳解

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。

文章題目：JavaWeb過濾器詳解
當前URL：http://aaarwkj.com/article26/gjoocg.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供移動網(wǎng)站建設(shè)、、關(guān)鍵詞優(yōu)化、服務器托管、微信公眾號、外貿(mào)建站

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時需注明來源： 創(chuàng)新互聯(lián)

h5響應式網(wǎng)站建設(shè)
久久综合给合综合久久| 午夜麻豆影网在线观看| 欧美日韩亚洲国产三级| 黄色录像黄色片黄色片| 可以看黄片的在线观看| 人妻少妇中文字幕一区| 欧美颜射一区二区三区| av剧情网址在线观看| 亚洲免费黄色大片网站| 深夜三级福利在线观看| 国产剧情av在线播放| 国产福利精品一区二区av| 欧美成人日本在线播放| 亚洲欧美日韩精品麻豆| 欧美日韩一区二区三区在线| 97久久精品人妻一区二区三区| 日本欧美三级高潮受不了| 日韩一区二区三级在线| 99久久偷拍美女大白屁股 | 亚洲中文字幕激情中午字幕| 国产av剧情在线免费观看| 亚洲精品紧身裙女教师av| 亚洲av色国产精品色午含羞草| 欧美一区二区三区久久束缚| 久久久久久精品妇女| 国产成人在线免费短视频| 免费97久久人妻一区精品| 日韩一级久久精品理论| 欧美日韩欧美黄色三级| 中文字幕在线日韩精品| 91久久高清国语自产拍| 久久国产成人精品免费看| 亚洲精品丝袜成人偷拍| 国产成人av网站在线观看| 欧美成人精品午夜一区二区| 久久av免费一区二区观看| 在线播放av男人的天堂| 欧美精品欧美精品一区二区 | 人妻中文字幕在线av| 99精品国产综合久久麻豆| 国产午夜男人天堂手机|