How can i use JAVA BEAN and JSP?
well, i have developed all my web apps by using pure JSP only, i know this sucks, but i dont know how to start on using beans... what directory should i put them into... etc... what are the good programminmg practices/standards/techniques when incorporating beans in jsp???
Standards are pretty loose, but generally, Beans hold a lot of the backend logic for your JSP. This can include data validation before entering into the database, database inserts, queries, data manipulation. The JSP should really only contain code that will retrieve the data from the bean and appropriately output it.
As far as using them, you can use the <jsp:useBean> tag in your JSP. As long as the bean is stored somewhere that your classpath points to, you're all set. From then on, you can use it like any other object in your JSP.
Similar Messages
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How can I using java bean to insert new record
Hi everybody,
I'd some problem when I insert a record using java bean. When insert a record, the resultset executeUpdate return 0 anc cannot add record to database. Would you please tell me what's wrong in my code?
java bean
package miniproj;
import java.sql.*;
public class Register{
private String sql;
private String username;
private String usertype;
private String password;
private String blocknum;
private int floornum;
private String owner;
private int rows;
private String s;
// set parameter to database
public int setMember(){
try{
//load database driver
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// Get a connection to the database
Connection sqlConn = java.sql.DriverManager.getConnection("jdbc.odbc:WFBS");
// Get a statement from the connection
Statement sqlStmt = sqlConn.createStatement();
sql = "INSERT INTO USERS(user_name, password) VALEUS ('aaa', 'aaa')";
// sql = "INSERT INTO USERS(user_name, password) VALEUS (" + user_name + "," + password + ")" ;
rows = sqlStmt.executeUpdate(sql);
// sqlRst.close();
sqlStmt.close();
sqlConn.close();
catch(SQLException se){
catch(Exception e){
return rows;
// set user name method
public void setUsername(String name){
username = name;
// set passwrod method
public void setPassword(String pwd){
password = pwd;
// set block num mehtod
public void setBlockNum(String block){
blocknum = block;
// set floor num method
public void setFloorNum(int floor){
floornum = floor;
// set owner method
public void setOnwer(String own){
owner = own;
// get user name method
public String getUsername(){
return username;
// get password method
public String getPassword(){
return password;
jsp code
<%@ include file="Header.jsp" %>
<%@ page errorPage="Error.jsp" %>
<jsp:useBean id="register" class="miniproj.Register" />
<jsp:setProperty name="register" property="*" />
User name : <%=register.getUsername()%><br>
Password : <%=register.getPassword()%><br>
<%
int i = register.setMember();
out.println(i);
%>
Thanks a lot
ChrisSeems to me that executeUpdate() would throw an SQLException, which in turn would get caught by your empty catch. The SQL keyword VALUES is misspelled. Put a 'se.printStackTrace()' in your catch to confirm this.
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How can we use java variable in javascript code on JSP page?
How can we use java variable in javascript code on JSP page?
Pls helpThink about it:
JSP/Java is executed on the Server and produces HTML+JavaScript.
Then that HTML+JavaScript is transfered to the client. The client now interpretes the HTML+JavaScript.
Obviously there's no way to access a Java variable directly from JavaScript.
What you can do, however, is write out some JavaScript that creates a JavaScript variable containing the value of your Java variable. -
hello friends,
i'm new to jsp. i want to create an html form that accepts username and a value from four radio buttons and display back the entered name and checked radio button's value using java bean.
i use the <jsp:setProperty id="" property="*"> method. i don't know how to access the radio buttons value from the html.
also when i use an additional field other than username the jsp page is showing error.
Please give me the correct method to use java bean with jsp in this circumstance.
thank you.thank you, but i have a problem left. the case is like this.
i got the jsp and bean worked fine when i have a sinle input text field.
but when i added a second text field i recieved the following error.
javax.servlet.ServletException: basket.newbean.getUserPass()Ljava/lang/String;
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.newform.process_jsp._jspService(process_jsp.java:69)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
where userPass is the new form element. I have made the subsequent chanes in my bean program and jsp file.
pls hlp. -
Hi frnds i want to help in servlet,java bean and JSP
hi friends i'm right now in M.SC(IT) and i want to do project in SERVLET,,JAVA BEANS and JSP ,
so pls give me a title about that
NOTE: I develop a project in group(2 persons there)
my email id is : [email protected] , [email protected] , [email protected]You cannot pair your iPod to a cell phone, so forget about it.
The only way you can get free WiFi is to hang out at a Denny's, a Starbucks, or a truck stop, and I don't think your parents would approve.... -
With Acrobat 6.0 I was able to copy a stamp in the same position (I mean "exactly" the same one) of different pages just by using the "copy/past" tool.
Now I am using Acrobat XI and it seems like it is not possible anymore: I am copying a stamp and I am trying to past it in anoter page, but it appears in the center of the page (or wherever it wants to...).
Does anyone have a solution?
Thanks in advance.Thank you very much. I'll be waiting for you message.
Messaggio originale----
Da: [email protected]
Data: 26/01/2015 17.56
A: "Umberto Gangi"<[email protected]>
Ogg: How can I use the "Copy and paste" tool in order get stamps in the same position in different pages (Acrobat XI for PC)?
How can I use the "Copy and paste" tool in order get stamps in the same position in different pages (Acrobat XI for PC)?
created by Gilad D (try67) in Creating, Editing & Exporting PDFs - View the full discussion
Well, I was in the same situation so I've developed a tool that allows one to do it. I will send you some additional information about it in a private message.
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Start a new discussion in Creating, Editing & Exporting PDFs by email or at Adobe Community
For more information about maintaining your forum email notifications please go to https://forums.adobe.com/thread/1516624. -
1. I have an iPod which has purchases synced with I tunes with an apple ID. I now have an iPad with a new ID for cloud. I have cloud storage capacity of 5gb which came with the iPad. How can I use one ID and store my existing music in cloud?
HI Frostyfrog
CHeck out iTunes Match which has an annual fee of £21 or thereabouts. You can store a maximum of 25,000 songs there and they all become available on your other kit, iPhone, iPad and iPod. I know it works as I have over 23000 songs uploaded of which only a few we're bought through iTunes.
it works by comparing your music to the whole iTunes music dadata base so you access the same tunes that you could get from iTunes. If you have obscure stuff, it uploads your own music to the cloud as a copy.
I Find it incredible that on my iPhone with its 16gb memory I can view almost 200 gb of music (ie my 23000 songs) and play any of them. Anything I add to iTunes becomes available via the cloud fairly quickly from a few minutes or a little longer if adding a lot.
The first time you use it it will take quite a while to match your music if you have a lot, but after that it is all automatic. Read the stuff on the apple site. Your PC needs to be at least running Vista. I recommend it and at less than 50p a week it's good value.
Good luck -
How can i use this sript and loade another movie?
Hi there, i used the following script to load a movie from the server;
var request:URLRequest = new URLRequest("url string");
var loader:Loader = new Loader()
loader.load(request);
addChild(loader);
How can i use this sript and loade another movie? Can someone help me please?
[edited by moderator]Sir, I changed it from:
var request:URLRequest = new URLRequest("http://agusandelsur.gov.ph/downloads/pdrrmo/agusan_del_sur/StaJosefa/Movies/Dir.swf");
var loader:Loader = new Loader()
loader.load(request);
addChild(loader);
to
var request:URLRequest = new URLRequest("http://agusandelsur.gov.ph/downloads/pdrrmo/agusan_del_sur/StaJosefa/Movies/Warning.swf");
var loader:Loader = new Loader()
loader.load(request);
addChild(loader);
When i expord the movie i get the following error.....
Scene 1, Layer 'Layer 3', Frame 1, Line 6 1151: A conflict exists with definition request in namespace internal. -
How can I use the battery and let it be perfectly healthy?
Hello everybody!
I love this forum because everyone is a great helpful person.. .. However, I'd like to ask you couple things about the MacBook battery...
I know that now the battery has been improved, it leasts longer and it can support 1000 charging cycles.
(Right now I'm performing the battery calibration)
I'd like to know how can I use the battery and let it be perfectly healthy.
For instance,
1) If I connect the laptop to the MagSafe and let it charge, when should I remove the plug from the Mac and when should I put it in charge? I don't wanna continously waste cycles and let my battery die too soon (it's too young to die! :-D ) .. I use it mainly at home connected to the MagSafe: someone tell that even if you leave the MagSafe connected after the mac has been charged it stops charging (I can see this), and others say that is not a good thing to let the mac connected to the plug for a long time... with the old model I used to disconnect the battery from the mac so I didn't have these problems but with the new one it's a long procedure...
2) I usually use to calibrate the battery once a month... Is it a good thing?
Thanks!
AndreaEverything you need to know about your battery is contained in this User Tip from frequent poster neuroanatomist:
http://discussions.apple.com/thread.jspa?threadID=1764220 -
I am going overseas to Singapore how can I use my ipad2 and my iPhone without it costing me a fortune. I am in Australia
iPhone - Locating wireless carriers
The above will provide carriers in Singapore that you can use. You would get the SIM card from the carrier. Of course if you are somewhere that has WiFi service then you won't need the cellular connection. -
How can i use PCIe 1433 and basler line camera to construct image and pocess it?
hello! every one ,I am new to machine vision.i have two problems to ask.First,how can i use line camera and 1433 to acquire 2-D image?second,if i want to pocess the 1-D signal ,how can i do it ?i expect for your answer ,thank you!
What you are trying to do is not something you can easily do in a forum, but I can give you the basics.
You have a CameraLink frame Grabber (PCIe 1433) and a LineScan Camera
The framegrabber needs to be configured to understand how to communicate with the camera. You need a file from the camera vendor. This file might already be installed. You can use MAX to check if it is, under Devices/IMAQ.
Assuming you can get to the point where you can communicate with the camera, you need to configure your acquisition.
Since the camera is a line scan camera, it captures image data one pixel ine at a time. You will need to configure the frame grabber to determine how many lines per image you want. The low limit is usually 1, and the high limit is either based on the framegrabber's internal memory, or that of the computer.
If you are using labview, you will need to open a sessing to the camera, acquire the image(s), and then close the session when you are done.
Once the image(s) are captured, you can performa analysis using the NI Vision Toolkit.
Sorry, but there is no way to condense years into one post.
Machine Vision, Robotics, Embedded Systems, Surveillance
www.movimed.com - Custom Imaging Solutions -
How can I use wget, cron and Automator to periodically pull an image from a URL (which is dynamically updated - like a weather map, say - to local storage, and then update a Keynote slide with that image, automatically?
Any particular reason for those specific technologies? wget does not exist on a mac, although you can nstall it I guess. OS X has curl installed which should do pretty much anything you want to do with wget. cron is being replaced by launchd, although cron still exists on mountain lion.
As far as I can tell from automator all the standard 'actions' to access keynote available to it require keynote to be open and running, but does not provide a function to actually open it. So I think you will have to write some applescript, as a minimum to open and quit keynote. I notice that the keynote actions are mostly circa 2005 an wonder if they would even work.
Under utilities in automator 'actions' there is a capability to add applescripts as part of the workflow.
Also, note that cron is being dprecated by Apple and replaced by launchd. that said cron is stil on my mountain lion instalation.
This entry at stackoverflow shows use of cron with curl to get web urls. http://stackoverflow.com/questions/1683620/getting-started-with-cronjobs-on-a-ma c
If I have any time I may try and get this to work as it is quite interesting and new to me. But otherwise, good luck. -
How can i use both Windows and Mac os at the same time on my iMac
How can i use both Windows and Mac os at the same time on my iMac
You can use Parallels desktop or VM Fusion to run both operating systems at the same time. Both programs work well, but I personally perfer VM Fusion.
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Using Java Bean in JSP to show database record
I have links in my Tomcat container that if someone clicks on a specific link it should go to a Record page (Show.jsp) with all the values associated with a record from a database.
For example if someone clicks on a specific link like this:
LinkExample
it would take you to a jsp with database info for someone named Jones and show you his info:
Lastname = Jones
Firstname = Mike
City = San Diego
I would like to do this using a Java helper class and bean so I dont have any database connection or Java code in my JSP.
I created Java class file that has Database connection that works with a Java bean. I just dont know how to get the Show.jsp to work with the Java Bean and Java helper class file.
Here is what I have for Show.jsp and this is the part I have been working on the longest but cant get it to work because it doesnt seem to work with the database:<jsp:useBean id="user" class="num.UserDB"/>
//do I call getUser(lastname) here and if so how?
<jsp:setProperty name="user" property="*"/>
Last Name: <jsp:getProperty name="user" property="lastname"/><BR>
First Name: <jsp:getProperty name="user" property="firstname"/><BR>
City: <jsp:getProperty name="user" property="city"/><BR>My Java Helper class that compiles and connects to database:
package num;
import java.io.*;
import java.sql.*;
import java.util.*;
import num.User;
public class UserDB
public User getUser(String lastname)
User user = new User();
try
Class.forName...//database connection stuff here
ResultSet results = stmt.executeQuery("SELECT * from user where lastname = '" + lastname + "'");
if(results.next() == true)
results.next();
user.setLastname(results.getString("lastname"));
user.setFirstname(results.getString("firstname"));
user.setFirstname(results.getString("city"));
catch(Exception e)
System.out.println("Exception...");
return user;
}My Java Bean that compiles here:
package num;
public class User
private String firstname;
private String lastname;
private String city;
public User()
//no arg constructor
public User(String firstname, String lastname, String city)
this.lastname = lastname;
this.firstname = firstname;
this.city = city;
public String getLastname()
return lastname;
public void setLastname(String lastname)
this.lastname = lastname;
//more bean methods for all fields here
Sorry if I wasnt specific enough. I have a link that passes a value (field that is passed is called lastname) to a JSP where I want to show record info for that value that is passed.
My question is how do I show the database record info on Show.jsp for the lastname field value of Jones where I want to use a Java Bean and Database helper class in Show.jsp
Here is the message I get when I hit the link (LinkExample) and it goes to Show.jsp:
org.apache.jasper.JasperException: Cannot find any information on property 'lastname' in a bean of type 'num.UserDB'
.....My UserDB class:
public class UserDB
public User getUser(String lastname)
User user = new User();
try
Class.forName("org.gjt.mm.mysql.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/dbconnone?user=smitherson&password=abcdefg");
Statement stmt = conn.createStatement();
ResultSet results = stmt.executeQuery("SELECT * from user where lastname = '" + lastname + "'");
if(results.next() == true)
results.next();
user.setLastname(results.getString("lastname"));
user.setFirstname(results.getString("firstname"));
user.city(results.getString("city"));
catch(Exception e)
System.out.println("Exception..." + e);
return user;
}Bean class:
package num;
public class User
private String firstname;
private String lastname;
private String city;
public User()
//no arg constructor
public User(String firstname, String lastname, Sting city)
this.firstname = firstname;
this.lastname = lastname;
this.city = city;
public String getFirstname()
return firstname;
public void setFirstname(String firstname)
this.firstname = firstname;
public String getLastname()
return lastname;
public void setLastname(String lastname)
this.lastname = lastname;
public String getCity()
return city;
public void setCity(String city)
this.city = city;
-
Hi..
I am trying to pass a 2D String array to a Java Bean and i am getting
"java.lang.NoSuchMethodError"
Any Ideas?
Thanks
Joe
Jsp Call
Sorts s = new Sorts();
s.getTotal(items);
"items[][]" is a 2 dimentional arrays and size can vary..
Java Bean
public class Sorts implements Serializable {
public double getTotal(String sItems[][]){
double aSum=0;
for(int i=0;i<sItems[0].length;i++){
aSum=aSum+(Double.parseDouble(sItems[1])*Double.parseDouble(sItems[2][i]));
return aSum;Can someone show me how to pass a 2 Dimentional Array to a Java Bean method? obviously i am doing something wrong.
Joe
Hi..
I am trying to pass a 2D String array to a Java Bean
and i am getting
"java.lang.NoSuchMethodError"
Any Ideas?
Thanks
Joe
Jsp Call
Sorts s = new Sorts();
s.getTotal(items);
"items[][]" is a 2 dimentional arrays and size can
vary..
Java Bean
public class Sorts implements Serializable {
public double getTotal(String sItems[][]){
double aSum=0;
for(int i=0;i<sItems[0].length;i++){
aSum=aSum+(Double.parseDouble(sItems[1])*Double.pars
Double(sItems[2][i]));
return aSum;
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