jsp Web Login Verification
- 2021-11-24 02:32:23
- OfStack
jsp Login Verification, Web Login Verification with Verification Code Verification, Login Function Added Verification Code
part_1: Class specially used to generate 1 verification code picture: VerificationCode. java
package cn.mike.javase.test;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
import org.junit.Test;
/**
* @author : Administrator
* @function : This is a class used to test randomly generated verification code pictures;
*/
public class VerificationCode {
/**
* Unit test, try 1 Can you automatically generate verification code pictures under
*/
// This function is used in unit testing, and here private1 You can't call it outside;
/* @Test */
/* public */private void test_fun() {
VerificationCode vc = new VerificationCode();
BufferedImage image = vc.getImage();
try {
// Generate a verification code picture and save it to the specified path
VerificationCode.output(image, new FileOutputStream(new File(
".\\image\\vcode_2.jpg")));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Output the randomly generated text content to the console for verification
System.out.println(vc.getText());
}
private int w = 70;// Width
private int h = 35;// Gao
private String text;// Text content ( Verification code string )
private Random r = new Random();
private String[] fontNames = { " Song Style ", " Chinese regular script ", " Blackbody ", " Microsoft Yahei ", " Regular script _GB2312" };
// The random character set does not include 0 And o , O , 1 And l Because these are not easy to distinguish
private String codes = "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYXZ";
// Background color of verification code picture: white
private Color bgColor = new Color(255, 255, 255);
/**
* Return 1 Verification code picture buffer Object: BufferedImage
*/
public BufferedImage getImage() {
BufferedImage image = createImage();
// Get Drawing Environment (Brush Tool)
Graphics2D g2 = (Graphics2D) image.getGraphics();
// sb : Used to save the text content of the verification code string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 4; ++i) {// Random generation 4 Characters
String s = randomChar() + "";
sb.append(s);
float x = i * 1.0F * w / 4;
g2.setFont(randomFont());
g2.setColor(randomColor());
g2.drawString(s, x, h - 5);
}
this.text = sb.toString();// Record the text content of the verification code
drawLine(image);// Draw interference lines
return image;
}
/**
* @return Get the text content of the verification code
*/
public String getText() {
return text;
}
/**
* @param image
* @param out
* Writes text to the specified output stream. For example, in this test FileOutputStream The specified save path
*/
public static void output(BufferedImage image, OutputStream out) {
try {
ImageIO.write(image, "jpeg", out);
} catch (IOException e) {
e.printStackTrace();
}
}
private void drawLine(BufferedImage image) {
Graphics2D g2 = (Graphics2D) image.getGraphics();
for (int i = 0; i < 3; ++i) {// Painting 3 Interference line
int x1 = r.nextInt(w);
int y1 = r.nextInt(h);
int x2 = r.nextInt(w);
int y2 = r.nextInt(h);
g2.setColor(Color.BLUE);
g2.drawLine(x1, y1, x2, y2);
}
}
private Color randomColor() {
int red = r.nextInt(150);
int green = r.nextInt(150);
int blue = r.nextInt(150);
return new Color(red, green, blue);
}
private Font randomFont() {
int index = r.nextInt(fontNames.length);
String fontName = fontNames[index];
int style = r.nextInt(4);
int size = r.nextInt(5) + 24;
return new Font(fontName, style, size);
}
private char randomChar() {
int index = r.nextInt(codes.length());
return codes.charAt(index);
}
private BufferedImage createImage() {
BufferedImage image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) image.getGraphics();
g2.setColor(this.bgColor);
g2.fillRect(0, 0, w, h);
return image;
}
}
part_2: Login interface: Login. jsp
<%@ page language="java" import="java.util.*" pageEncoding="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">
-->
<script type="text/javascript">
function _change_verity_code() {
var imgElem = document.getElementById("img_src");
// Add 1 Request parameters a Because, usually browsers have caches, click to change 1 I didn't respond when I was Zhang, so I added 1 Request parameters, get the current request time, can be accurate to milliseconds, so the parameters of each request are different, so the browser has cache does not hinder;
imgElem.src = "/ServletDemoProject/servlet/GetVerificationCodeServlet?a="
+ new Date().getTime();
}
</script>
</head>
<%
String fdbkMsg = (String) request.getAttribute("fdbkMsg");
if (null == fdbkMsg) {
fdbkMsg = "";
}
%>
<%
Boolean logedIn = (Boolean) session.getAttribute("logedIn");
if (null == logedIn) {
logedIn = false;
} else if (logedIn) {
// If you have logged in during this session, redirect directly to success-page-1
response
.sendRedirect("/ServletDemoProject/LOGIN-DEMO/success-page-1.jsp");
}
%>
<%
String username = "";
Cookie[] cookies = request.getCookies();
if ((null != cookies) && (cookies.length > 0)) {
for (Cookie c : cookies) {
if ("admin".equals(c.getValue())) {
username = "admin";
break;
}
}
}//end if-condition
%>
<body>
<br>
<div align="center">
Please log in :
<br>
<form action="/ServletDemoProject/servlet/LoginVerificationServlet"
method="post">
<div>
User name:
<input type="text" name="username" value="<%=username%>" />
<br>
</div>
<div>
Dense Code:
<input type="password" name="password" />
<br>
</div>
<div>
Verification code:
<input type="text" name="code_text" size="3" />
<img src="/ServletDemoProject/servlet/GetVerificationCodeServlet"
id="img_src" />
<a href="javascript:_change_verity_code()"> Change 1 Zhang </a>
<br>
</div>
<div>
<font color='red'><%=fdbkMsg%></font>
<br>
</div>
<div>
<input type="submit" value=" Submit " />
<br>
</div>
</form>
</div>
</body>
</html>
part_3: servlet for login verification: LoginVerificationServlet. java
package cn.mike.servlet.test_1212;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.mike.javase.test.VerificationCode;
public class GetVerificationCodeServlet extends HttpServlet {
private static final long serialVersionUID = -3520994675366100452L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 1. New 1 A VerificationCode Class;
VerificationCode vc = new VerificationCode();
// 2. From VerificationCode Obtain in the class BufferedImage Object;
BufferedImage bufImage = vc.getImage();
// 3. At the same time, get the text content in the verification code and put it in session Domain, Used for verification;
String code_text = vc.getText();
request.getSession().setAttribute("code_text", code_text);
// 4. Output the generated picture to the client browser
VerificationCode.output(bufImage, response.getOutputStream());
}// end method-doGet
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// do same as GET-method :
doGet(request, response);
}// end method-doPost
}
part_4: Prompt interface after successful login: success-page-1. jsp
<%@ page language="java" import="java.util.*" pageEncoding="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 'success-page-1.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>
<%
String username = (String) session.getAttribute("username");
if (null == username) {
// If username Is null, indicating that it is not from the normal channel and forwarded to Login Page;
request.setAttribute("fdbkMsg", " Don't try to come in through the back door, log in quickly! ");
request.getRequestDispatcher("/LOGIN-DEMO/Login.jsp").forward(
request, response);
}
%>
<body>
<br>
<%=username%> Has successfully landed.
<br>
<font> You can choose to browse: </font>
<br>
<a href="/ServletDemoProject/LOGIN-DEMO/success-page-2.jsp"> Click here to have wonderful things .</a>
<br>
<a href="/ServletDemoProject/LOGIN-DEMO/success-page-2.jsp"> It's more exciting to click here .</a>
<br />
<a href="/ServletDemoProject/LOGIN-DEMO/success-page-2.jsp"> Do you dare to light here .</a>
<br />
</body>
</html>
part_5: Prompt interface after successful login: success-page-2. jsp
<%@ page language="java" import="java.util.Date" pageEncoding="UTF-8"%>
<%@ page language="java" import="java.text.SimpleDateFormat"%>
<%
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 'success-page-2.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>
<%
String username = (String) session.getAttribute("username");
if (null == username) {
request.setAttribute("fdbkMsg", " Heheda, is this where you come from? Log in! ");
// Forward to login interface :
request.getRequestDispatcher("/LOGIN-DEMO/Login.jsp").forward(
request, response);
}
SimpleDateFormat sDateFormat = new SimpleDateFormat("a");
Date today = new Date();
String am_pm_str = sDateFormat.format(today);
String am_pm_str_in_chinese = "";
if ("am".equalsIgnoreCase(am_pm_str)) {
am_pm_str_in_chinese = " Morning ";
} else
am_pm_str_in_chinese = " Afternoon ";
// set null;
sDateFormat = null;
today = null;
am_pm_str = null;
%>
<body>
<br />
<font><b><%=username%><%=am_pm_str_in_chinese%> OK, you can come to the page 2 It's not easy .</b>
</font>
</body>
</html>