Aaron Parker

I've tried c:set commands that look like this, but I get this error:
<c:set var="${feedErrorBean.url}" value=""/> <c:set var="${feedErrorBean.urlMessage}" value=""/>

org.apache.jasper.JasperException: /strutsNewRSSFeed.jsp(66,8) According to TLD or attribute directive in tag file, attribute var does not accept any expressions

Thanks.

I've been told that this part of my jsp is correct for passing a value to a servlet:

<form action="ChangeAccess?id=${subscriber.key}" method="GET"> <input type="submit" value="Change"> </form>

What I don't know is how to get that data out of the request. I've tried this, but it returns a null:

String id = req.getParameter("id");

How do I get the value of id?

Thanks.

I know of one way using HTML forms. You can pass in user entered data and retrieve it from the request in the called servlet:

<form id="login" action="DoLogin" method="post">
...
<tr> <td>Login</td> <td><INPUT id="Text1" type="text" name="email"></td> <td>Password</td> <td><input type="password" name="password" ID="Password1"></td> </tr>
...

Then in the DoLogin servlet:

String email = request.getParameter("email"); String password = request.getParameter("password");

If you need to pass non user entered values, it's possible by passing it thru the action parameter of the form, but I'm here trying to find out how!

Hope this helps.

Aaron Parker

How do I get a value (or call the get method) from a javabean to display on my jsp page?

I've got my usebean statement, but if I have a getEmail method in my bean, how do I get the value of the email to the jsp page?

I've tried <c :-o ut value="${subscriber.email}/>


<jsp:useBean id="subscriberBean" class="java169.project1.Subscriber" scope="session" />

There is a getEmail() and an variable email in the bean.

Thanks.
[ March 24, 2005: Message edited by: Aaron Parker ]

How do I get results out of the uniqueResult() method of the Query class. I can get a result into it, but I can't find anything that explain how to get stuff out!

Object results;
results = query.uniqueResult();

PS to moderator, I posted this in Servlets, too as that's what I'm working with, but was unsure where to post.

Thanks.

How do I get results out of the uniqueResult() method of the Query class. I can get a result into it, but I can't find anything that explain how to get stuff out!

Object results;
results = query.uniqueResult();

I have code which returns a database query as a list. I need to be able to select individual elements of this list and place them in an html table.

for (ListIterator i = empList.listIterator(); i.hasNext(); ) {
//out.println("<tr><td>"+i.next().get(0)+"</td></tr>");
//above doesn't work, below works but only returns all 8 elements of list
out.println("<tr><td>"+i.next()+"</td></tr>");
}

In the above code, I'd like to expand it to have 8 td elements. The list has 8 elements. I tried using the Get method, but the API is as cryptic as ever as far as the syntax goes.

Contents of i.next():101, Joe, A, Coyne, 111-22-3333, HR, 125, 3726



Aaron Parker

[ November 22, 2004: Message edited by: Aaron Parker ]
[ November 22, 2004: Message edited by: Aaron Parker ]

If you were to try to compile code which can cause an exception without "throws Exception", It won't compile. For certain things you must either have "throws Exception" or have the offending code in a try-catch block. (The compiler will tell you if it needs it when you try to compile). If you're in an intro class and haven't dealt with exception handling yet, it may be enough to know that the throws must be present for compilation.

I/O is one such thing that requires exception handling. Looking at the code you posted, I don't believe there is anything that would require the throws. I suspect that coding them is a habit your instructor wants you to get into.

My PrintWriter will write (some) data to disk if the file written is very large but none if it is small. The StringBuffer writes to screen ok with a small file, but won't write all of a large file, unless PrintWriter is commented out. (Small test file 355b, large 839k).

package java146.project1; import java.io.*; import java.util.*; import java146.util.*; public class TokenCount implements Analyzer { private Map map = new TreeMap(); private PropertiesManager props = null; private PrintWriter out = null; public TokenCount(PropertiesManager propMan) { props = propMan; } public void processToken(String token) { if (map.containsKey(token)) { ((Counter) map.get(token)).increment(); } else { map.put(token, new Counter(1)); } } public void generateReport() { StringBuffer sb = new StringBuffer(); Set set = map.entrySet(); Iterator i = set.iterator(); try { out = new PrintWriter(new BufferedWriter(new FileWriter(props.props.getProperty("tokencountfile")))); } catch (java.io.IOException ioe) { ioe.printStackTrace(); } while (i.hasNext()) { Map.Entry me = (Map.Entry) i.next(); sb.append(me.getKey() + "\t"); sb.append(me.getValue() + "\n"); } out.print(sb); System.out.println(sb); } }

Help?

Thanks

Thank you so much! I can't believe how simple some of these problems seem after you have the answer!

I get this message on compile:

TokenCount.java:68: cannot resolve symbol
symbol : method getProperty (java.lang.String)
location: class java146.util.PropertiesManager
= new PrintWriter(new BufferedWriter(new FileWriter(props.getProperty("tokencountfile"))));
^
1 error
(carat under dot between props & getProperty)

I passed PropertiesManager() into TokenCount which is an instance of Properties().

The TokenCount file is as follows:

package java146.project1; import java.io.*; import java.util.*; import java146.util.*; public class TokenCount implements Analyzer { private Map map = new TreeMap(); private PropertiesManager props = null; public TokenCount(PropertiesManager propMan) { props = propMan; } public void processToken(String token) { if (map.containsKey(token)) { ((Counter) map.get(token)).increment(); } else { map.put(token, new Counter(1)); } } public void generateReport() { StringBuffer sb = new StringBuffer(); Set set = map.entrySet(); Iterator i = set.iterator(); while (i.hasNext()) { Map.Entry me = (Map.Entry) i.next(); System.out.print(me.getKey() + "\t"); System.out.println(me.getValue()); } PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(props.getProperty("tokencountfile")))); //out = sb; System.out.println(sb); } }

The PropertiesManager is:

package java146.util; import java.io.*; import java.util.*; public class PropertiesManager { String propFile; public PropertiesManager(String propertiesFile) { propFile = propertiesFile; } public Properties props = null; public void loadProps() { props = new Properties(); try { props.load(this.getClass().getResourceAsStream("/" + propFile)); } catch (java.io.IOException ioe) { System.out.println("Can't load the properties file"); ioe.printStackTrace(); } catch (Exception e) { System.out.println("Error: " + e); e.printStackTrace(); } } }

I don't understand why it can't resolve this.

Can anyone explain to me why when I run this code, I get 4 cols and 2 rows instead of 2 cols and 2 rows?

import java.util.*; import java.awt.*; import java.awt.event.*; import java.text.*; import javax.swing.*; public class Titles1 extends JApplet implements ActionListener { Container con = getContentPane(); GridLayout f = new GridLayout(2,2); JButton button1 = new JButton("Please Click to Enter Employee"); JLabel nameL = new JLabel("Employee Name"); JLabel titleL = new JLabel("Title"); JTextField nameTF = new JTextField("", 15); JTextField titleTF = new JTextField("", 15); JLabel empRec1 = new JLabel(); JLabel empRec2 = new JLabel(); public String[] employeeName = new String[2]; public String[] employeeTitle = new String[2]; public int x = 0; public void init() { con.setLayout(f); con.add(nameL); con.add(nameTF); con.add(titleL); con.add(titleTF); con.add(button1); con.add(empRec1); con.add(empRec2); button1.addActionListener(this); nameTF.requestFocus(); } public void actionPerformed(ActionEvent e) { employeeName[x] = nameTF.getText(); employeeTitle[x] = titleTF.getText(); nameTF.setText(""); titleTF.setText(""); x++; if (x == 2) { empRec1.setText(employeeName[0] + " " + employeeTitle[0]); empRec2.setText(employeeName[1] + " " + employeeTitle[1]); //con.add(empRec1); //con.add(empRec2); repaint(); } else { button1.setText("Please Click to Enter Employee #" + (x + 1)); repaint(); nameTF.requestFocus(); System.out.println(x); } } }

<HTML> <head> </head> <body> <APPLET CODE="Titles1.class" WIDTH=450 HEIGHT=200> </APPLET> </body> </head>
(Code tags added by Michael Morris)
[ April 23, 2004: Message edited by: Michael Morris ]

How do I find out how long an array is (number of elements). How do I do that in Java?
My first incorrect guess was (as a oondition in my for loop):
for (x = 0; x < length(fictionTitles[]); ++x) {

(Before I had Date dateAndTime = new Date(); just above JLabel dateTime)

I can't get this to compile. How do I get a date into the label?
import java.util.*; import java.awt.*; import java.awt.event.*; import java.text.*; import javax.swing.*; /** * Description of the Class * *@author Aaron *@since March 10, 2004 */ public class TodayIs extends JApplet implements ActionListener { Container con = getContentPane(); FlowLayout f = new FlowLayout(); JButton button1 = new JButton(); JLabel todayIs = new JLabel("Today is "); JLabel dateTime = new JLabel(dateAndTime); /** Description of the Method */ public void init() { con.setLayout(f); con.add(button1); button1.addActionListener(this); button1.requestFocus(); } /** * Description of the Method * *@param e Description of the Parameter */ public void actionPerformed(ActionEvent e) { con.add(dateTime); validate(); } }