登錄頁面的驗證碼生成與驗證

時間 2019-11-17

標籤登錄頁面驗證碼生成驗證简体版

原文原文鏈接

登錄頁面的驗證碼生成與驗證html

特色：基於strurs2框架減小對數據庫的訪問次數避免無效的訪問提升服務器的性能java

1 登錄界面：基於struts2框架 <s:src action>動態獲取隨機驗證碼圖片數據庫

<%@ page language="java" import="java.util.*" pageEncoding="utf-8" %>apache

<%@ taglib prefix="s" uri="/struts-tags" %>服務器

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">session

<html>框架

<head>jsp

</head>post

<body>性能

賬號：<input type="text"user.username"/><br/>

密碼：<input type="password" name="user.password"/>

<br/>

</form>

</body>

</html>

2 userAction:

a：getImage()方法中產生隨機4位String驗證碼存入值棧session會話中

b：把4爲數字轉爲jpg格式的圖片並把圖片傳給login頁面並顯示出來

c: loginUser()方法中經過成員變量收參獲取頁面輸入框中的client輸入的驗證碼與值棧session中存進的隨機產生驗證碼serviceCode進行比較，相同則驗證經過容許訪問數據庫不相同則返回登錄頁面並提示「驗證碼錯誤」

package com.baizhi.nick.action;

import java.awt.image.BufferedImage;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.baizhi.nick.entity.Users;

import com.baizhi.nick.service.UserServiceImpl;

import com.baizhi.nick.validimage.SecurityCode;

import com.baizhi.nick.validimage.SecurityImage;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.util.ValueStack;

public class UserAction extends ActionSupport {

private Users user;

private String clientCode;

//登錄

public String loginUser(){

System.out.println("---- im loginUser---- "+user);

//值棧

ValueStack vs=ActionContext.getContext().getValueStack();

//get serviceCode

String serviceCode = (String) vs.findValue("#session.code");

if(!serviceCode.equals(clientCode)){

vs.setValue("#request.errMsg", "驗證碼不正確");

return "errorlogin";

}

//invoking service

UserServiceImpl service=new UserServiceImpl();

user=service.loginUser(user);

if(user==null){

vs.setValue("#request.errMsg", "改用戶未註冊，請註冊！");

return "errorlogin";

}

//set user

vs.setValue("#session.user", user);

System.out.println("查詢結果："+user);

return "queryAll";

}

//註冊

public String registUser(){

UserServiceImpl service=new UserServiceImpl();

if(user.getUsername()==null){

return "errorregist";

}

service.registUser(user);

return "login";

}

//驗證碼

public String getImage() throws IOException{

//1 獲取4爲驗證碼

String serviceCode = SecurityCode.getSecurityCode();

//2 把驗證碼--》session

ActionContext.getContext().getValueStack().setValue("#session.code", serviceCode);

//3 根據驗證碼生成圖片

BufferedImage bufferedImage = SecurityImage.createImage(serviceCode);

//4 把圖片寫到client

HttpServletResponse response = ServletActionContext.getResponse();

response.setContentType("image/jpeg");

ServletOutputStream out = response.getOutputStream();

ImageIO.write(bufferedImage, "jpg", out);

return null;

}

public Users getUser() {

return user;

}

public void setUser(Users user) {

this.user = user;

}

public String getClientCode() {

return clientCode;

}

public void setClientCode(String clientCode) {

this.clientCode = clientCode;

}

3：配置文件xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

"http://struts.apache.org/dtds/struts-2.3.dtd" >

<result name="errorlogin">/jsp/login.jsp</result>

<param name="namespace">/person</param>

<param name="actionName">queryAll</param>

</result>

</action>

</action>

</package>

</struts>

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