Calling doGet() from in the doPost() method.

What is the conditions we have to cheak to call doGet() method from doPost().

doGet() using for request.getParameter(). the exact story is u want to get some data form html (or) data bases. it is usefu

Similar Messages

  • Call doGet from init

    Hello
    Please could you show through the code. I think there is something wrong with the init. If I run the servlet, it don't show a thing. It only displays: Site can't not be shown.
    The doGet and also the dopost is not executed. Must I call in the doPost in the init(). And when yes how?
    Thanks a lot!
    Sandra Frei
    import java.sql.*;
    import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    import java.util.Properties;
    public class update42 extends HttpServlet {
    Connection con = null;
    public void init() {//throws ServletException {
    String url = "jdbc:DBF:/sys:copal/copal_data/data/gesch/data/stamm";
    try {
    //Register the JDBC driver
    Class.forName("zyh.sql.dbf.DBFDriver");//.newInstance();
    con = DriverManager.getConnection(url, "fre","sandy66");
    catch( Exception e ) {
    e.printStackTrace();
    }//end catch
    }//end init()
    public void doGet(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException {
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();
    out.print("in do get");
    //connecting to the Database
    Statement stmt = null;
    ResultSet rs = null;
    PreparedStatement ps = null;
    try
    stmt = con.createStatement();
    catch (SQLException e) {e.getNextException();}
    // displaying records
    try
    rs = stmt.executeQuery("SELECT Random, Nsa, Bzng, Bzn2, Tart, Meeh, Fstat, Nzn FROM part");
    catch (SQLException e) {e.getNextException();}
    try
    while(rs.next()) {
    out.print("<form action=\"");
    out.print( req.getRequestURI() );
    out.print("\" method=\"post\">");
    out.print("<input type=\"text\""); //hidden
    out.print(" name=\"Random\" size=\"15\" value=\"");//without 15
    out.print( rs.getObject(1).toString() );
    out.print("\">");
    out.print("<input type=\"text\"");
    out.print(" name=\"Nsa\" size=\"15\" value=\"");
    out.print( rs.getObject(2).toString() );
    out.print("\">");
    out.print("<input type=\"text\"");
    out.print(" name=\"Bzng\" size=\"25\" value=\"");
    out.print( rs.getObject(3).toString() );
    out.print("\">");
    out.print("<input type=\"text\"");
    out.print(" name=\"Bzn2\" size=\"25\" value=\"");
    out.print( rs.getObject(4).toString() );
    out.print("\">");
    out.print("<input type=\"text\"");
    out.print(" name=\"Tart\" size=\"6\" value=\"");
    out.print( rs.getObject(5).toString() );
    out.print("\">");
    out.print("<input type=\"text\"");
    out.print(" name=\"Meeh\" size=\"6\" value=\"");
    out.print( rs.getObject(6).toString() );
    out.print("\">");
    out.print("<input type=\"text\"");
    out.print(" name=\"Fstat\" size=\"6\" value=\"");
    out.print( rs.getObject(7).toString() );
    out.print("\">");
    out.print("<input type=\"text\"");
    out.print(" name=\"Nzn\" size=\"15\" value=\"");
    out.print( rs.getObject(8).toString() );
    out.print("\">");
    out.print(" <input type=\"submit\"");
    out.print(" value=\" \">");
    out.print(" Update<br>");
    out.print("</form>");
    catch (SQLException e) {e.getNextException();}
    try
    if(rs != null)
    rs.close();
    if(stmt != null)
    stmt.close();
    catch (SQLException e) {
    e.printStackTrace();
    out.print("</pre></code>");
    out.print("<p\"><a href=\"");
    out.print( req.getRequestURI() );
    out.print("\">Back</a></p>");
    out.print("</body></html>");
    out.close();
    public void doPost(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException {
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();
    out.print("<html><body>");
    out.print("<code><pre>");
    out.print("<table border=1>");
    out.print("<tr>");
    out.print("<td><font color=green>Artikelnr</font></td>");
    out.print("<td><font color=green>Bezeichnung</font></td>");
    out.print("<td><font color=green>Zusatzbezeichnung</font></td>");
    out.print("<td><font color=green>Art</font></td>");
    out.print("<td><font color=green>ME</font></td>");
    out.print("<td><font color=green>Stat</font></td>");
    out.print("<td><font color=green>Spezifikation</font></td>");
    out.print("</tr>");
    // receiving parameters
    String Bzn2 = req.getParameter("Bzn2").trim();
    String Meeh= req.getParameter("Meeh").trim();
    String Pk = req.getParameter("Random").trim();
    boolean proceed = false;
    Statement stmt = null;
    Statement stmt1 = null;
    ResultSet rs = null;
    try {
    String sql;
    sql = "UPDATE part SET Bzn2 = " + "'" + Bzn2 + "'" + " WHERE Random LIKE " + "'" + Pk + "'";
    stmt1 = con.createStatement();
    out.print(sql);
    out.print(Bzn2 + Meeh + Pk);
    stmt1.executeUpdate(sql);
    // displaying records
    stmt = con.createStatement();
    rs = stmt.executeQuery("SELECT * FROM part");
    while(rs.next())
    out.print("<tr>");
    out.print("<td>"+ rs.getObject(1).toString()+ "</td>");
    out.print("<td>"+ rs.getObject(2).toString()+ "</td>");
    out.print("<td>"+ rs.getObject(3).toString()+ "</td>");
    out.print("<td>"+ rs.getObject(4).toString()+ "</td>");
    out.print("<td>"+ rs.getObject(5).toString()+ "</td>");
    out.print("<td>"+ rs.getObject(6).toString()+ "</td>");
    out.print("<td>"+ rs.getObject(7).toString()+ "</td>");
    out.print("</tr>");
    out.print("</table>");
    catch (Exception e)
    out.print(e.getMessage());
    e.printStackTrace();
    try
    if(rs != null)
    rs.close();
    if(stmt != null)
    stmt.close();
    if(stmt1 != null)
    stmt1.close();
    catch (SQLException e) {e.getNextException();}
    out.print("</pre></code>");
    out.print("<p\"><a href=\"");
    out.print( req.getRequestURI() );
    out.print("\">Back</a></p>");
    out.print("</body></html>");
    out.close();
    public void destroy() {
    try {
    //Close the connection to the database
    con.close();
    } catch( Exception e ) {
    e.printStackTrace();
    }

    No, do NOT call doGet() or doPost() from the init() method. Your problem is something else, but you have not provided enough information to figure out what, and there are several possibilites. "Site can't not be shown"... I doubt that is the exact message you are getting.

  • AJAX calling a servlet's synchronized doPost method

    Hi all. This problem has been bugging me for a week already and still no solution in sight...
    Anyway, buttons in a page I'm creating uses AJAX to call a servlet's synchronized doPost method. Once a button is clicked, the servlet calls another java class which does some back end processing. Once the called java program is finished running, the page is updated telling the user that the selected backend process has finished running. It works fine if I just run one backend process at a time...however, if try to run another backend process while the previous backend process is still running, even if the backend process is finished, the page doesn't get updated with the message informing the user that the job is finished. The page only gets updated once all the jobs have finished running. What I want to happen is that whenever a job gets finished, the page gets updated.

    Yeah, it has
    something to do with the threads. However, I had to
    synchronize the doPost method because if the doPost
    method isn't synchronized, running 2 or more back end
    processes simultaneously would result in the previous
    backend processes being terminated, only the last
    back end process would be run successfully.Yea! that's what I wanted to say! most of the time there are critical sections in your code when concurrency is there, you need to recognize them and synchronize only the critical sections.
    I don't think synchronizing the whole dopost method is a better way to deal with concurrency issues. It defeats the purpose of spawning a new thread for each request(it's my personal opinion, I may be wrong).
    But I got one contradiction from one member of sun forum, he says spawning thread from a servlet is not a good practice according to java EE specification. But I don't think there is any way out other than this, to deal with this scenario. I am waiting for further suggestions, so keep an eye on this thread:
    http://forum.java.sun.com/thread.jspa?threadID=5149048
    ~cheers~

  • How can I kill all Threads of the same class from within the run() method?

    Ok
    I have a class called Consumer that extends Thread
    I have several Consumer threans running... but, when a certain condition is true (within the run() method) in ANY of the threads, I want to kill ALL the threads of that object.
    is this possible?

    I know this is gonna be too demanding, but can someone please tell me why my Consumer's run() method never reaches the System.out.println( "ALL CONSUMING DONE") line
    Create a multi-threaded prime number calculator that is based on the producer-consumer model
    using semaphores. Your program should be able to check for prime numbers in a range specified
    by the user and with a variable number of threads. Example:
    $ java PrimeFind 3 5000 10000
    should use 1 producer and 2 consumers (3 threads in total, obviously the minimum is 2) to find all
    the prime numbers in the range [5000,10000].
    The producer should: use a buffer to store candidate numbers that have to be checked for
    primality.
    Consumers should: read from the buffer, check if a number is prime and update the status of the
    program accordingly (e.g. show the number on the screen, or save it to a file)
    import java.util.concurrent.Semaphore;
    import java.io.*;
    public class Assign1 {
    static int fromThisNumber;
    static int toThisNumber;
    static int numberOfThreads;
    static int buffer[];
    static Semaphore ready;          /*This semaphore is used by the Producer to signal
                                         an "OK" to the consumers*/
    static Semaphore critical;  /*This is a Mutex semaphore. It allows only 1 consumer
                                         to enter his critical section.
    static Semaphore counter;     /*This semaphore acts as a counter.
                                        Instead of having a global variable
                                         incremented each time, we just release()
                                         this semephore when we find a prime number
                                         Because remember that release() increments permits
    static Producer prod;
    static Consumer cons[];
    static int in=0;
    static int out=0;
    static PrintWriter outFile;
         public static void main (String args[]){
              try{
                   outFile=new PrintWriter(new FileWriter("primes.txt"));
                   }catch(Exception e){}
              numberOfThreads=Integer.parseInt(args[0]);
              fromThisNumber=Integer.parseInt(args[1]);
              toThisNumber=Integer.parseInt(args[2]);
              buffer=new int[Integer.parseInt(args[2])-Integer.parseInt(args[1])+1];
              ready=new Semaphore(0,false); /*We initialise it to 0 because we wait
                                                      for the Producer to produce atleast a
                                                      item. Suppose ready was 1 and if
                                                      Consumer ran first he would be in an
                                                      empty buffer */
              critical=new Semaphore (1,false);/*We initialise it to 1 because when
                                                         the first Consumer thread tries
                                                         to enter its critical section, it
                                                         should be allowed to;
                                                         Subsequent threads will have to
                                                         wait since only 1 thread can
                                                         access its critical section at a time*/
              counter=new Semaphore(0,false); // duh!
              cons=new Consumer[numberOfThreads-1]; /*numberOfThreads-1 because 1 thread
                                                                is taken by the Producer*/
              //Creating Producer object
              prod=new Producer();
              //Creating the Consumer object and start the thread.
              for(int i=0;i<cons.length;i++)
                        cons=new Consumer();
                        cons[i].start();
              prod.start();          
              //Printing to screen and file
    /*          for(int i=0;i<buffer.length;i++)
                   if(buffer[i]!=0)
                             System.out.println(buffer[i]);
                             outFile.println(buffer[i]);
              System.out.println("Total primes found between "+args[1]+" and "+toThisNumber+": "+counter.availablePermits()+"\n primes.txt written");
              outFile.println("Total primes found between "+args[1]+" and "+toThisNumber+": "+counter.availablePermits());
              outFile.close();*/                    
    static class Producer extends Thread {
         public void run(){try{
              while(in<buffer.length)     /*'in' should always be more than 'out'.Oherwise the consumer will try to access an empty index*/
                   {     System.out.println("producing");     
                        buffer[in]=fromThisNumber;
                        in++;
                        fromThisNumber++;
                        ready.release();
              catch (Exception e){e.printStackTrace();}
              System.out.println("ALL PRODUCING DONE");
    static class Consumer extends Thread {
         int tempout=0;
         public void run(){try{
              System.out.println("before while"+this.getId());
              while(tempout<=in)
                   System.out.println("before ready"+this.getId()+" "+ready.availablePermits()+" "+in);
                   ready.acquire();
                   System.out.println("before critical.acquire"+this.getId());
                   critical.acquire();
                   tempout=out;
                   out++;
                   critical.release();               
                   if(!isPrime(buffer[tempout]))
                        {System.out.println(buffer[tempout]+" by "+this.getId());buffer[tempout]=0;}
                   else {counter.release();System.out.println("prime added: "+buffer[tempout]+" by "+this.getId());}
                   critical.acquire();
                   tempout=out;
                   System.out.println("tempout:"+tempout+" of "+this.getId());
                   critical.release();
              System.out.println("ALL CONSUMING DONE"+this.getId());
         catch(Exception e){e.printStackTrace();}
         //Prime number-checking method     
         public boolean isPrime(int n){
              for(int i=2;i<=(n/2);i++)
                   if(n%i==0)
                        return false;
              return true;
    ======================
    import java.util.concurrent.Semaphore;
    import java.io.*;
    /* 3 questions to ask Barlas
    * Why error if I start the Consumer threads before Producer
    * Why does the counter semaphore always give a +1 result at the end
    * Is there a way I can verify that all the work is not being done by only 1 consumer thread? In other words, the workload is being shared properly
    * if I put ready.acquire() outside or inside the while loop, its not making any difference, why?
    * Strangely, its not making any difference if I playing with the release() and aquire() of the semaphores, WHY?!?!
    public class Assign1 {
    static int fromThisNumber;
    static int toThisNumber;
    static int numberOfThreads;
    static int buffer[];
    static Semaphore ready;          /*This semaphore is used by the Producer to signal
                                       an "OK" to the consumers*/
    static Semaphore critical; /*This is a Mutex semaphore. It allows only 1 consumer
                                       to enter his critical section.
    static Semaphore counter;     /*This semaphore acts as a counter.
                                  Instead of having a global variable
                                       incremented each time, we just release()
                                       this semephore when we find a prime number
                                       Because remember that release() increments permits
    static Producer prod;
    static Consumer cons[];
    static int in=0;
    static int out=0;
    static PrintWriter outFile;
         public static void main (String args[]){
              try{
                   outFile=new PrintWriter(new FileWriter("primes.txt"));
                   }catch(Exception e){}
              numberOfThreads=Integer.parseInt(args[0]);
              fromThisNumber=Integer.parseInt(args[1]);
              toThisNumber=Integer.parseInt(args[2]);
              buffer=new int[Integer.parseInt(args[2])-Integer.parseInt(args[1])+1];
              ready=new Semaphore(0,false); /*We initialise it to 0 because we wait
                                                      for the Producer to produce atleast a
                                                      item. Suppose ready was 1 and if
                                                      Consumer ran first he would be in an
                                                      empty buffer */
              critical=new Semaphore (1,false);/*We initialise it to 1 because when
                                                      the first Consumer thread tries
                                                      to enter its critical section, it
                                                      should be allowed to;
                                                      Subsequent threads will have to
                                                      wait since only 1 thread can
                                                      access its critical section at a time*/
              counter=new Semaphore(0,false); // duh!
              cons=new Consumer[numberOfThreads-1]; /*numberOfThreads-1 because 1 thread
                                                                is taken by the Producer*/
              //Creating Producer object
              prod=new Producer();
              //Creating the Consumer object and start the thread.
              for(int i=0;i<cons.length;i++)
                        cons[i]=new Consumer();
                        cons[i].start();
              prod.start();          
              //Printing to screen and file
    /*          for(int i=0;i<buffer.length;i++)
                   if(buffer[i]!=0)
                             System.out.println(buffer[i]);
                             outFile.println(buffer[i]);
              System.out.println("Total primes found between "+args[1]+" and "+toThisNumber+": "+counter.availablePermits()+"\n primes.txt written");
              outFile.println("Total primes found between "+args[1]+" and "+toThisNumber+": "+counter.availablePermits());
              outFile.close();*/                    
    static class Producer extends Thread {
         public void run(){try{
              while(in<buffer.length)     /*'in' should always be more than 'out'.Oherwise the consumer will try to access an empty index*/
                   {     System.out.println("producing");     
                        buffer[in]=fromThisNumber;
                        in++;
                        fromThisNumber++;
                        ready.release();
              catch (Exception e){e.printStackTrace();}
              System.out.println("ALL PRODUCING DONE");
    static class Consumer extends Thread {
         int tempout=0;
         public void run(){try{
              System.out.println("before while"+this.getId());
              while(tempout<=in)
                   System.out.println("before ready"+this.getId()+" "+ready.availablePermits()+" "+in);
                   ready.acquire();
                   System.out.println("before critical.acquire"+this.getId());
                   critical.acquire();
                   tempout=out;
                   out++;
                   critical.release();               
                   if(!isPrime(buffer[tempout]))
                        {System.out.println(buffer[tempout]+" by "+this.getId());buffer[tempout]=0;}
                   else {counter.release();System.out.println("prime added: "+buffer[tempout]+" by "+this.getId());}
                   critical.acquire();
                   tempout=out;
                   System.out.println("tempout:"+tempout+" of "+this.getId());
                   critical.release();
              System.out.println("ALL CONSUMING DONE"+this.getId());
         catch(Exception e){e.printStackTrace();}
         //Prime number-checking method     
         public boolean isPrime(int n){
              for(int i=2;i<=(n/2);i++)
                   if(n%i==0)
                        return false;
              return true;
    ===========================
    BTW, when I tried to change extends Thread to implements Runnable I got some kinda of error.
    Actually, my program is pretty complete... its just that something if messed up in my Consumer's run() method's while loop... I think
    I know guys its crazy to ask ya'll to look at so much code, but.... I'd really appreciate it. This assignment is killing me, been at it since 10 hours now....

  • How to configure Outlook 2013 to call direct from within the application without using Lync 2013?

    I have Outlook 2013 running on Windows 7 Pro 64-Bit with Lync 2013 (Office 365 Pro). We are using a 3rd party TAPI app from FortiVoice. WE would like to be able to place calls directly from
    within Outlook either by selecting a telephone number within an email and/or via the PEOPLE (Contacts) area.
    What guidelines should we use to enable this feature and not have Lync 2013 intercepting the process i.e. let OUTLOOK handle placing calls?
    Thanks in advance for any feedback provided.

    Hi,
    There seems no solution for this issue so far.
    Here is a fix for older versions of Outlook, maybe worth a try.
    http://support.microsoft.com/kb/959625/en-us
    However, if it doesn’t work, please try Malte’s reply as the workaround in the following thread. See:
    http://social.technet.microsoft.com/Forums/office/en-US/3946f1bb-cc3d-41b6-ab9c-092d62d024d1/outlook-2013-tapi-calling-with-lync-installed?forum=officesetupdeploy
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    Steve Fan
    TechNet Community Support
    We
    are trying to better understand customer views on social support experience, so your participation in this
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  • Someone calling you from outside the United States

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    Feedback and such would be much appreciated! Thanks

    Suemac wrote:
    If my friend calls me from Australia and they use either a land line or a cell phone. Am I going to get charged extra at all even if my plan is older on my cell phone? I only get 500 shared minutes a month at the moment for all types of minutes except M2M. Also what type of minutes am I going to eat (i.e: my everyday plan minutes or roaming) if I am currently in my home state in the US? Also is it going to show up on the bill differently then normal than any other type of call?
    Feedback and such would be much appreciated! Thanks
    As long as you are in the US when you receive their call, you will not get charged anything extra for receiving this call.

  • Calling Graphics from Form the App Crashes

    I have a problem when I call Graphics from a Form.
    The Graphics file builds dynamically many boxes.
    The Form file has a Chart Item with this graphics file (calling it in batch mode.
    I have noticed that sometimes, when I click on the chart or when the form builds the graphic the app quits or crashes. (When I run the graphic file alone from Graphics Builder there is no problem)
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    I have a similar problem, and don't know why, sometimes if I close the graphics runtime there's no problem

  • Calling Transaction from ALV using OO Method

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    I have an ALV grid with columns such as month wise Total of a GL account  say JAN, feb etc...
    When I double click on any of these cells it should take me to the respective Transaction (say FBL3n for the GL account and the company code) . I am able to track the GL account for which the total is displayed and company code is one of my selection criteria. In the main screen of the FBL3N we have to enter the posting date and i also want the Radio button against "all items', presently default is against 'Open Items'. So how can i proceed.
    Thanks and Regards,
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    SET HANDLER gr_event_handler->handle_double_click FOR gr_alvgrid .
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    *Handle Double Click
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    PERFORM handle_double_click USING e_row e_column es_row_no .
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      PUBLIC SECTION.
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