.: Mr.cAm - Y: cuong_pho_nui :. » java http://phamcuong.info Khám phá thế giới (^o^) Tue, 27 Jul 2010 03:02:20 +0000 en hourly 1 http://wordpress.org/?v=3.0 Cài phần mềm cho máy Samsung http://phamcuong.info/2010/04/05/cai-ph%e1%ba%a7n-m%e1%bb%81m-cho-may-samsung/ http://phamcuong.info/2010/04/05/cai-ph%e1%ba%a7n-m%e1%bb%81m-cho-may-samsung/#comments Mon, 05 Apr 2010 16:09:57 +0000 admin http://phamcuong.info/?p=895 Máy samsung cài toàn lạ người, chắc để cho mấy ông ở tiệm ăn thêm :-s
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]]> http://phamcuong.info/2010/04/05/cai-ph%e1%ba%a7n-m%e1%bb%81m-cho-may-samsung/feed/ 1 Lỗi connect database, xa xưa nhưng gây lỗi 500 http://phamcuong.info/2009/12/10/l%e1%bb%97i-connect-database-xa-x%c6%b0a-nh%c6%b0ng-gay-l%e1%bb%97i-500/ http://phamcuong.info/2009/12/10/l%e1%bb%97i-connect-database-xa-x%c6%b0a-nh%c6%b0ng-gay-l%e1%bb%97i-500/#comments Thu, 10 Dec 2009 16:59:51 +0000 admin http://phamcuong.info/?p=597 Tối đẹp trời này tớ đã bị mắc lỗi này và mất cả tiếng đồng hồ ngồi gãi đầu, mãi mới nhớ ra.

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException

Đây là dòng báo lỗi của em nó.

Và nguyên nhân là do trong lớp connectDB thiếu 1 dòng.

Trước là như vầy:

Connection connection = null;
try {
connection = DriverManager.getConnection(“jdbc:postgresql://localhost:5432/caxxx”,”postgres”,”xxxxxx”);
} catch (Exception e) {}
return connection;

Và sửa lại như thế này để chạy bình thường:

Connection connection = null;
try {
Class.forName(“org.postgresql.Driver”);
connection = DriverManager.getConnection(“jdbc:postgresql://localhost:5432/caxxxx”,”postgres”,”xxxxxx”);
} catch (Exception e) {}
return connection;

]]> http://phamcuong.info/2009/12/10/l%e1%bb%97i-connect-database-xa-x%c6%b0a-nh%c6%b0ng-gay-l%e1%bb%97i-500/feed/ 1 Sử dụng captcha trong Struts http://phamcuong.info/2009/11/02/s%e1%bb%ad-d%e1%bb%a5ng-captcha-trong-struts/ http://phamcuong.info/2009/11/02/s%e1%bb%ad-d%e1%bb%a5ng-captcha-trong-struts/#comments Mon, 02 Nov 2009 02:59:07 +0000 admin http://phamcuong.info/?p=489 This Java Captcha Example demonstrates you how to develop a captcha Servlet and use in your Struts 2 application.

Developing Struts 2 Captcha Application
In this section we are going to develop Captcha Servlet and then use the same to validate Struts 2 based web applications. We have developed a Servlet that generates Captcha image.

Let’s see how our Captcha application works.

Working of the application

  1. captcha.jsp: This page contains the captcha image and one text field.
  2. User reads the image text and then enters in the “Code” text field. After entering the value in the text field, user clicks on the “Verify“  command button.
  3. Then our Struts 2 action validates the user input and the session Captcha value.  If user enters the correct image code in the text filed, then action  forward to the “success.jsp” page. Otherwise, it gives an error and go to again the “captcha.jsp“.

1. Index page
In the  index.html we have added a link to captcha.jsp. User can click on this link to go to the captcha form.

<html>
<head>
<title>Capcha Validation</title>
<style>
a:link{ color:red; text-decoration:underline; }
a:visited{ color:red; text-decoration:underline; }
a:hover{ color:green; text-decoration:none; }
a:active{ color:red; text-decoration:underline; }
</style>
</head>
<body>
<table>
<tr><td><a href=”captcha.jsp”>Captcha Application</a></td></tr>
</table>
</body>
</html>

2. Captcha Page
The GUI of the application consists of  Captcha page  (captcha.jsp).
The captcha.jsp is used to display the valid code and a text box.

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Capcha Validation</title>
<style>
.errorMessage {
color: red;
font-size: 0.8em;
}

.label {
color:#000000;
}
</style>
</head>
<body>
<table>
<tr>
<td>
<h1>Captcha Validation</h1>
<s:form action="doCaptcha" method="POST">
<s:actionerror />
<img src="Captcha.jpg" border="0">
<s:textfield label="Code" name="j_captcha_response" size="20" maxlength="10"/>
<s:submit value="Verify" align="center" />
</s:form>
</td>
</tr>
</table>
</body>
</html>

The code :
<s:actionerror />
displays action errors and field validation errors.

The code <s:form action=”doLogin” method=”POST”> generates the html form for the application.

The code :

<img src=”Captcha.jpg” border=”0″>
<s:textfield label=”Code” name=”j_captcha_response” size=”20″ maxlength=”10″/>

The submit button is generated through <s:submit value=”Verify” align=”center” /> code.

3. Servlet Class
Develop a Servlet class “RoseIndiaCaptcha.java” to create a Captcha image. Here is the code of RoseIndiaCaptcha.java Servlet class:

package com.roseindiaCaptcha.servlet;

import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.awt.font.TextAttribute;

public class RoseIndiaCaptcha extends HttpServlet {

private int height=0;
private int width=0;

public static final String CAPTCHA_KEY = "captcha_key_name";

public void init(ServletConfig config) throws ServletException {
super.init(config);
height=Integer.parseInt(getServletConfig().getInitParameter("height"));
width=Integer.parseInt(getServletConfig().getInitParameter("width"));
}

protected void doGet(HttpServletRequest req, HttpServletResponse response)
throws IOException, ServletException {
//Expire response
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Max-Age", 0);

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = image.createGraphics();
Hashtable<TextAttribute, Object> map = new Hashtable<TextAttribute, Object>();
Random r = new Random();
String token = Long.toString(Math.abs(r.nextLong()), 36);
String ch = token.substring(0,6);
Color c = new Color(0.6662f, 0.4569f, 0.3232f);
GradientPaint gp = new GradientPaint(30, 30, c, 15, 25, Color.white, true);
graphics2D.setPaint(gp);
Font font=new Font("Verdana", Font.CENTER_BASELINE , 26);
graphics2D.setFont(font);
graphics2D.drawString(ch,2,20);
graphics2D.dispose();

HttpSession session = req.getSession(true);
session.setAttribute(CAPTCHA_KEY,ch);

OutputStream outputStream = response.getOutputStream();
ImageIO.write(image, "jpeg", outputStream);
outputStream.close();

}

}

4.Mapping  for Servlet class in web.xml

<servlet>
<servlet-name>Captcha</servlet-name>
<display-name>Captcha</display-name>
<servlet-class>com.roseindiaCaptcha.servlet.RoseIndiaCaptcha</servlet-class>
<init-param>
<description>passing height</description>
<param-name>height</param-name>
<param-value>30</param-value>
</init-param>
<init-param>
<description>passing height</description>
<param-name>width</param-name>
<param-value>120</param-value>
</init-param>
</servlet>

<servlet-mapping>
<servlet-name>Captcha</servlet-name>
<url-pattern>/Captcha.jpg</url-pattern>
</servlet-mapping>

5.Success page

After successful validation page  transfer to the “success.page”

<html>
<head>
<title>Capcha Validation</title>
</head>
<body>
<table><tr><td><h1>You are Succesfully Validate</h1></td></tr></table>
</body>
</html>

6.Developing Action Class
Now let’s develop the action class to handle the Captcha validation request.

The code  String c= (String)session.getAttribute(RoseIndiaCaptcha.CAPTCHA_KEY) is used to get the Captcha value stored in session and then validate it with the user input. Here is the code of the Action class.

package com.roseindiaCaptcha.action;
import com.opensymphony.xwork2.ActionSupport;
import java.util.Date;
import javax.servlet.http.*;
import javax.servlet.*;
import com.opensymphony.xwork2.ActionContext;
import com.roseindiaCaptcha.servlet.*;

public  class CaptchaAction  extends ActionSupport {
public String execute() throws Exception {
HttpServletRequest request  = (HttpServletRequest)
ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_REQUEST);
Boolean isResponseCorrect = Boolean.FALSE;
javax.servlet.http.HttpSession session = request.getSession();
String parm = request.getParameter("j_captcha_response");
String c= (String)session.getAttribute(RoseIndiaCaptcha.CAPTCHA_KEY) ;
if(!parm.equals(c) ){
addActionError("Invalid Code! Please try again!");
return ERROR;
}else{
return SUCCESS;
}
}
}

7.Configuring action mapping (in struts.xml)
Now we will create action mapping in the struts.xml file. Here is the code to be added in the struts.xml:

<action name=”doCaptcha” class=”com.roseindiaCaptcha.action.CaptchaAction”>
<result name=”error”>captcha.jsp</result>
<result>success.jsp</result>
</action>

In the above mapping the action “doCaptcha” is used to validates the user using action class (CaptchaAction.java).

Output :


If invalid code the error message is display.


After successfully validation message :


Download the application

Java Captcha in Struts 2 Application
This Java Captcha Example demonstrates you how to develop a captcha Servlet and use in your Struts 2 application.

Java Captcha in Struts 2 Application

This Java Captcha Example demonstrates you how to develop a captcha Servlet and use in your Struts 2 application.

Developing Struts 2 Captcha Application
In this section we are going to develop Captcha Servlet and then use the same to validate Struts 2 based web applications. We have developed a Servlet that generates Captcha image.

Let’s see how our Captcha application works.

Working of the application

  1. captcha.jsp: This page contains the captcha image and one text field.
  2. User reads the image text and then enters in the “Code” text field. After entering the value in the text field, user clicks on the “Verify“  command button.
  3. Then our Struts 2 action validates the user input and the session Captcha value.  If user enters the correct image code in the text filed, then action  forward to the “success.jsp” page. Otherwise, it gives an error and go to again the “captcha.jsp“.

1. Index page
In the  index.html we have added a link to captcha.jsp. User can click on this link to go to the captcha form.

<html>
<head>
<title>Capcha Validation</title>
<style>
a:link{ color:red; text-decoration:underline; }
a:visited{ color:red; text-decoration:underline; }
a:hover{ color:green; text-decoration:none; }
a:active{ color:red; text-decoration:underline; }
</style>
</head>
<body>
<table>
<tr><td><a href=”captcha.jsp”>Captcha Application</a></td></tr>
</table>
</body>
</html>

2. Captcha Page
The GUI of the application consists of  Captcha page  (captcha.jsp).
The captcha.jsp is used to display the valid code and a text box.

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Capcha Validation</title>
<style>
.errorMessage {
color: red;
font-size: 0.8em;
}

.label {
color:#000000;
}
</style>
</head>
<body>
<table>
<tr>
<td>
<h1>Captcha Validation</h1>
<s:form action="doCaptcha" method="POST">
<s:actionerror />
<img src="Captcha.jpg" border="0">
<s:textfield label="Code" name="j_captcha_response" size="20" maxlength="10"/>
<s:submit value="Verify" align="center" />
</s:form>
</td>
</tr>
</table>
</body>
</html>

The code :
<s:actionerror />
displays action errors and field validation errors.

The code <s:form action=”doLogin” method=”POST”> generates the html form for the application.

The code :

<img src=”Captcha.jpg” border=”0″>
<s:textfield label=”Code” name=”j_captcha_response” size=”20″ maxlength=”10″/>

The submit button is generated through <s:submit value=”Verify” align=”center” /> code.

3. Servlet Class
Develop a Servlet class “RoseIndiaCaptcha.java” to create a Captcha image. Here is the code of RoseIndiaCaptcha.java Servlet class:

package com.roseindiaCaptcha.servlet;

import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.awt.font.TextAttribute;

public class RoseIndiaCaptcha extends HttpServlet {

private int height=0;
private int width=0;

public static final String CAPTCHA_KEY = "captcha_key_name";

public void init(ServletConfig config) throws ServletException {
super.init(config);
height=Integer.parseInt(getServletConfig().getInitParameter("height"));
width=Integer.parseInt(getServletConfig().getInitParameter("width"));
}

protected void doGet(HttpServletRequest req, HttpServletResponse response)
throws IOException, ServletException {
//Expire response
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Max-Age", 0);

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = image.createGraphics();
Hashtable<TextAttribute, Object> map = new Hashtable<TextAttribute, Object>();
Random r = new Random();
String token = Long.toString(Math.abs(r.nextLong()), 36);
String ch = token.substring(0,6);
Color c = new Color(0.6662f, 0.4569f, 0.3232f);
GradientPaint gp = new GradientPaint(30, 30, c, 15, 25, Color.white, true);
graphics2D.setPaint(gp);
Font font=new Font("Verdana", Font.CENTER_BASELINE , 26);
graphics2D.setFont(font);
graphics2D.drawString(ch,2,20);
graphics2D.dispose();

HttpSession session = req.getSession(true);
session.setAttribute(CAPTCHA_KEY,ch);

OutputStream outputStream = response.getOutputStream();
ImageIO.write(image, "jpeg", outputStream);
outputStream.close();

}

}

4.Mapping  for Servlet class in web.xml

<servlet>
<servlet-name>Captcha</servlet-name>
<display-name>Captcha</display-name>
<servlet-class>com.roseindiaCaptcha.servlet.RoseIndiaCaptcha</servlet-class>
<init-param>
<description>passing height</description>
<param-name>height</param-name>
<param-value>30</param-value>
</init-param>
<init-param>
<description>passing height</description>
<param-name>width</param-name>
<param-value>120</param-value>
</init-param>
</servlet>

<servlet-mapping>
<servlet-name>Captcha</servlet-name>
<url-pattern>/Captcha.jpg</url-pattern>
</servlet-mapping>

5.Success page

After successful validation page  transfer to the “success.page”

<html>
<head>
<title>Capcha Validation</title>
</head>
<body>
<table><tr><td><h1>You are Succesfully Validate</h1></td></tr></table>
</body>
</html>

6.Developing Action Class
Now let’s develop the action class to handle the Captcha validation request.

The code  String c= (String)session.getAttribute(RoseIndiaCaptcha.CAPTCHA_KEY) is used to get the Captcha value stored in session and then validate it with the user input. Here is the code of the Action class.

package com.roseindiaCaptcha.action;
import com.opensymphony.xwork2.ActionSupport;
import java.util.Date;
import javax.servlet.http.*;
import javax.servlet.*;
import com.opensymphony.xwork2.ActionContext;
import com.roseindiaCaptcha.servlet.*;

public  class CaptchaAction  extends ActionSupport {
public String execute() throws Exception {
HttpServletRequest request  = (HttpServletRequest)
ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_REQUEST);
Boolean isResponseCorrect = Boolean.FALSE;
javax.servlet.http.HttpSession session = request.getSession();
String parm = request.getParameter("j_captcha_response");
String c= (String)session.getAttribute(RoseIndiaCaptcha.CAPTCHA_KEY) ;
if(!parm.equals(c) ){
addActionError("Invalid Code! Please try again!");
return ERROR;
}else{
return SUCCESS;
}
}
}

7.Configuring action mapping (in struts.xml)
Now we will create action mapping in the struts.xml file. Here is the code to be added in the struts.xml:

<action name=”doCaptcha” class=”com.roseindiaCaptcha.action.CaptchaAction”>
<result name=”error”>captcha.jsp</result>
<result>success.jsp</result>
</action>

In the above mapping the action “doCaptcha” is used to validates the user using action class (CaptchaAction.java).

Output :


If invalid code the error message is display.


After successfully validation message :


Download the application

]]> http://phamcuong.info/2009/11/02/s%e1%bb%ad-d%e1%bb%a5ng-captcha-trong-struts/feed/ 1 Sử dụng Struts trong java http://phamcuong.info/2009/11/01/s%e1%bb%ad-d%e1%bb%a5ng-struts-trong-java/ http://phamcuong.info/2009/11/01/s%e1%bb%ad-d%e1%bb%a5ng-struts-trong-java/#comments Sun, 01 Nov 2009 01:18:22 +0000 admin http://phamcuong.info/?p=478 Cách để làm việc nhẹ nhàng hơn với nhập liệu trong dịch vụ web của JSP.

Thư viện:

•Tải về từ địa chỉ sau:

http://www.mediafire.com/download.php?izk3yht5nyo

Bao gồm (tối thiểu để chạy struts):

Photobucket

Cách cài đặt: file struts

<!DOCTYPE struts PUBLIC

“-//Apache Software Foundation//DTD Struts Configuration 2.0//EN”

“http://struts.apache.org/dtds/struts-2.0.dtd”>

<struts>

<package name=”default” extends=”struts-default”>

<action name=”HelloWorld”>

<result name=”SUCCESS”>/success.jsp</result>

</action>

</package>

</struts>

File này nằm trong thư mục gốc của thư mục src ( thư mục chứa file java)

Cách cài đặt: thêm vào file web.xml

<filter>

<filter-name>struts2</filter-name>

<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>

</filter>

<filter-mapping>

<filter-name>struts2</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

Cách sử dụng: form struts

Khai báo taglib như thẻ c (jstl)

<%@taglib uri=”/struts-tags” prefix=”s” %>

Ví dụ:

<s:form action=”HelloWorld” >

<s:textfield name=”userName” label=”User Name” />

<s:submit />

</s:form>

Có thể kô sử dụng taglib, nhưng trong form, thẻ action thì bắt buộc tên action có thêm đuôi .action

Ví dụ:

Thay <form action=“Hello” … >

Thành <form action=“Hello.action” …>

Cách sử dụng: lớp action

Tạo mới lớp java bình thường: Biến nhận vào phải giống với name trong input ở thẻ form.

Biến phải có đầy đủ getter và setter. Chỉ được thao tác với biến qua getter và setter.

Ví dụ:

Biến String name;

Chỉ được gọi getName() kô được dùng name

Hiện thực phương thức:

public String execute() {};

Sẽ viết sử lý của lớp action trong đây.

Trả về có 2 mặc định là:

Return SUCCESS; (nếu đúng)

Return INPUT; (nếu có sai sót)

Cấu hình: file struts

Mỗi action đều fải khai báo với file struts

Thêm vào:

<action name=”HelloWorld”>

<result name=”SUCCESS”>/success.jsp</result>

</action>

Tương ứng với trả về trong file action thì sẽ trỏ địa chỉ trang trả về.

Xem ví dụ ở: http://www.vaannila.com/struts-2/struts-2-example/struts-2-example.html

]]> http://phamcuong.info/2009/11/01/s%e1%bb%ad-d%e1%bb%a5ng-struts-trong-java/feed/ 5 lỗi không viết được servlet trong java trên eclipse http://phamcuong.info/2009/05/16/l%e1%bb%97i-khong-vi%e1%ba%bft-d%c6%b0%e1%bb%a3c-servlet-trong-java-tren-eclipse/ http://phamcuong.info/2009/05/16/l%e1%bb%97i-khong-vi%e1%ba%bft-d%c6%b0%e1%bb%a3c-servlet-trong-java-tren-eclipse/#comments Sat, 16 May 2009 04:18:57 +0000 admin http://phamcuong.info/?p=6

Nếu bạn khởi tạo file servlet trong java mà không được, là do chưa add thư viện cho eclipes.

Các bạn thêm thư viện như sau:

]]> http://phamcuong.info/2009/05/16/l%e1%bb%97i-khong-vi%e1%ba%bft-d%c6%b0%e1%bb%a3c-servlet-trong-java-tren-eclipse/feed/ 8