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Thread: How to pass the ArrayList form servelet to jsp?

  1. #1
    Junior Member
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    Default How to pass the ArrayList form servelet to jsp?

    Hi,

    I m new in Servlet side programming.i want to pass the ArrayList from Servlet to JSP page.how do i do this? below is what i tried.it allways pass Null value.My java file name is Login.java and my jsp file name is FirstJSP.jsp.

    FirstJSP.jsp
    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>`
    <%@ page import="java.util.ArrayList" %>

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org /TR/html4/loose.dtd">`
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>`
    </head>
    <body>


    <%
    ArrayList <String> str1=new ArrayList <String>();

    if (request.getSession().getAttribute("str1") != null) {
    str1 = (ArrayList ) request.getSession().getAttribute("str1");
    out.println(str1);
    }

    %>


    </body>
    </html>

    Login.java


    package com;

    import java.io.IOException;
    import java.util.ArrayList;

    import javax.servlet.RequestDispatcher;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    public class Login extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public Login() {
    super();
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    ArrayList <String> str1=new ArrayList <String>();
    HttpSession session = request.getSession(true);
    response.setContentType("text/html");

    try
    {
    str1.add("String1");
    str1.add("String2");

    request.setAttribute("str1", str1);

    String destination="/FirstJSP.jsp"; //If authentication fails///////////
    RequestDispatcher rd = getServletContext().getRequestDispatcher(destinati on);
    rd.forward(request, response);

    }

    catch (Exception e)
    {
    throw new ServletException(e.toString());
    }


    }
    }


  2. #2
    Junior Member
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    Arrow How to pass the ArrayList form servelet to jsp?

    Hi Friends,
    I m new in servlet side.I want to pass the arraylist from servlet to jsp.how do i do this? below is what i tried.But i always shows null valuses.what is my mistake?

    Here is my code:
    Login.java

    package com;

    import java.io.IOException;
    import java.util.ArrayList;

    import javax.servlet.RequestDispatcher;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    public class Login extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public Login() {
    super();
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    ArrayList <String> str1=new ArrayList <String>();
    HttpSession session = request.getSession(true);
    response.setContentType("text/html");

    try
    {
    str1.add("String1");
    str1.add("S");

    request.setAttribute("str1", str1);

    String destination="/FirstJSP.jsp"; //If authentication fails///////////
    RequestDispatcher rd = getServletContext().getRequestDispatcher(destinati on);
    rd.forward(request, response);

    }

    catch (Exception e)
    {
    throw new ServletException(e.toString());
    }


    }
    }


    FirstJSP.jsp

    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>`
    <%@ page import="java.util.ArrayList" %>

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org /TR/html4/loose.dtd">`
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>`
    </head>
    <body>


    <%
    ArrayList <String> str1=new ArrayList <String>();

    if (request.getSession().getAttribute("str1") != null) {
    str1 = (ArrayList ) request.getSession().getAttribute("str1");
    out.println("str1");
    }

    %>d


    </body>
    </html>

  3. #3
    Member Chris.Brown.SPE's Avatar
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    Default Re: How to pass the ArrayList form servelet to jsp?

    Writing code is your job, helping you fix and understand it is mine.

    <-- Be sure to thank and REP (Star icon) those who have helped you. They appreciate it!

  4. #4
    Member Chris.Brown.SPE's Avatar
    Join Date
    May 2008
    Location
    Fort Wayne, Indiana
    Posts
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    1
    Thanked 31 Times in 31 Posts

    Default Re: How to pass the ArrayList form servelet to jsp?

    There's a difference between request attributes and session attributes. Notice when you save your variable you are doing request.setAttribute() but when you get it back you call request.getSession().getAttribute(). You need to pick one or the other. The request object only lasts for this request while the session continues to exists as the user navigates through the website.
    Writing code is your job, helping you fix and understand it is mine.

    <-- Be sure to thank and REP (Star icon) those who have helped you. They appreciate it!

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