640 lines
21 KiB
HTML
640 lines
21 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: Using HTMLFormConverter" />
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<meta name="abstract" content="" />
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<meta name="description" content="" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="frmconex" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Using HTMLFormConverter</title>
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</head>
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<body id="frmconex"><a name="frmconex"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Using HTMLFormConverter</h1>
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<div><p></p>
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<div class="section"><p>While running a web server with servlet support, compile and run
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the following example to see how the HTMLFormConverter works: </p>
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<pre>import java.awt.Color;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.sql.DriverManager;
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import java.sql.Connection;
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import java.sql.ResultSet;
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import java.sql.Statement;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import com.ibm.as400.util.html.GridLayoutFormPanel;
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import com.ibm.as400.util.html.HTMLConstants;
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import com.ibm.as400.util.html.HTMLForm;
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import com.ibm.as400.util.html.HTMLTable;
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import com.ibm.as400.util.html.HTMLTableCaption;
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import com.ibm.as400.util.html.HTMLText;
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import com.ibm.as400.util.html.LabelFormElement;
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import com.ibm.as400.util.html.LineLayoutFormPanel;
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import com.ibm.as400.util.html.SubmitFormInput;
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import com.ibm.as400.util.html.TextFormInput;
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import com.ibm.as400.util.servlet.HTMLFormConverter;
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import com.ibm.as400.util.servlet.SQLResultSetRowData;
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import com.ibm.as400.access.AS400;
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import com.ibm.as400.access.AS400JDBCDriver;
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/**
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* An example of using the HTMLFormConverter class in a servlet.
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*/
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public class HTMLFormConverterExample extends HttpServlet
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{
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private String userId_ = "myUserId";
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private String password_ = "myPwd";
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private AS400 system_;
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private Connection databaseConnection_;
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// Perform cleanup before returning to the main HTML form.
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public void cleanup()
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{
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try
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{
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// Close the database connection.
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if (databaseConnection_ != null)
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{
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databaseConnection_.close();
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databaseConnection_ = null;
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}
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}
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catch (Exception e)
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{
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e.printStackTrace ();
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}
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}
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// Convert the row data to formatted HTML.
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private HTMLTable[] convertRowData(SQLResultSetRowData rowData)
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{
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try
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{
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// Create the converter, which will generate HTML from
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// the result set that comes back from the database query.
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HTMLFormConverter converter = new HTMLFormConverter();
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// Set the form attributes.
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converter.setBorderWidth(3);
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converter.setCellPadding(2);
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converter.setCellSpacing(4);
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// Convert the row data to HTML.
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HTMLTable[] htmlTable = converter.convertToForms(rowData);
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return htmlTable;
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}
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catch (Exception e)
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{
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e.printStackTrace ();
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return null;
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}
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}
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// Return the response to the client.
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException
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{
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response.setContentType("text/html");
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PrintWriter out = response.getWriter();
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out.println(showHtmlMain());
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out.close();
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}
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// Handle the data posted to the form.
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public void doPost (HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException
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{
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SQLResultSetRowData rowData = new SQLResultSetRowData();
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HTMLTable[] htmlTable = null;
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// Get the current session object or create one if needed.
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HttpSession session = request.getSession(true);
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ServletOutputStream out = response.getOutputStream();
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response.setContentType("text/html");
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Hashtable parameters = getRequestParameters (request);
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// Retrieve the row data and HTML table values for this session.
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rowData = (SQLResultSetRowData) session.getValue("sessionRowData");
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htmlTable = (HTMLTable[]) session.getValue("sessionHtmlTable");
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// if this is the first time through, show first record
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if (parameters.containsKey("getRecords"))
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{
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rowData = getAllRecords(parameters, out);
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if (rowData != null)
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{
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// Set the row data value for this session.
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session.putValue("sessionRowData", rowData);
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// Position to the first record.
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rowData.first();
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// Convert the row data to formatted HTML.
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htmlTable = convertRowData(rowData);
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if (htmlTable != null)
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{
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rowData.first();
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session.putValue("sessionHtmlTable", htmlTable);
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out.println(showHtmlForRecord(htmlTable, 0));
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}
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}
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}
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// If the "Return To Main" button was pressed,
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// go back to the main HTML form
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else if (parameters.containsKey("returnToMain"))
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{
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session.invalidate();
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cleanup();
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out.println(showHtmlMain());
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}
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// if the "First" button was pressed, show the first record
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else if (parameters.containsKey("getFirstRecord"))
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{
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rowData.first();
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out.println(showHtmlForRecord(htmlTable, 0));
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}
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// if the "Previous" button was pressed, show the previous record
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else if (parameters.containsKey("getPreviousRecord"))
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{
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if (!rowData.previous())
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{
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rowData.first();
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}
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out.println(showHtmlForRecord(htmlTable, rowData.getCurrentPosition()));
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}
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// if the "Next" button was pressed, show the next record
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else if (parameters.containsKey("getNextRecord"))
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{
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if (!rowData.next())
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{
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rowData.last();
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}
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out.println(showHtmlForRecord(htmlTable, rowData.getCurrentPosition()));
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}
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// if the "Last" button was pressed, show the last record
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else if (parameters.containsKey("getLastRecord"))
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{
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rowData.last();
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out.println(showHtmlForRecord(htmlTable, rowData.getCurrentPosition()));
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}
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// if none of the above, there must have been an error
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else
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{
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out.println(showHtmlForError("Internal error occurred. Unexpected parameters."));
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}
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// Save the row data value for this session so the current position
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// is updated in the object associated with this session.
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session.putValue("sessionRowData", rowData);
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// Close the output stream
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out.close();
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}
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// Get all the records from the file input by the user.
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private SQLResultSetRowData getAllRecords(Hashtable parameters, ServletOutputStream out)
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throws IOException
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{
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SQLResultSetRowData records = null;
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try
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{
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// Get the system, library and file name from the parameter list.
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String sys = ((String) parameters.get("System")).toUpperCase();
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String lib = ((String) parameters.get("Library")).toUpperCase();
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String file = ((String) parameters.get("File")).toUpperCase();
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if ((sys == null || sys.equals("")) ||
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(lib == null || lib.equals("")) ||
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(file == null || file.equals("")))
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{
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out.println(showHtmlForError("Invalid system, file or library name."));
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}
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else
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{
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// Get the connection to the server.
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getDatabaseConnection (sys, out);
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if (databaseConnection_ != null)
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{
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Statement sqlStatement = databaseConnection_.createStatement();
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// Query the database to get the result set.
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String query = "SELECT * FROM " + lib + "." + file;
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ResultSet rs = sqlStatement.executeQuery (query);
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boolean rsHasRows = rs.next(); // position cursor to first row
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// Show error message if the file contains no record;
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// otherwise, set row data to result set data.
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if (!rsHasRows)
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{
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out.println(showHtmlForError("No records in the file."));
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}
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else
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{
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records = new SQLResultSetRowData (rs);
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}
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// Don't close the Statement before we're done using
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// the ResultSet or bad things may happen.
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sqlStatement.close();
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}
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}
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}
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catch (Exception e)
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{
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e.printStackTrace ();
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out.println(showHtmlForError(e.toString()));
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}
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return records;
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}
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// Establish a database connection.
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private void getDatabaseConnection (String sysName, ServletOutputStream out)
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throws IOException
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{
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if (databaseConnection_ == null)
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{
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try
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{
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databaseConnection_ =
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DriverManager.getConnection("jdbc:as400://sysName,userId_,password_ );
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}
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catch (Exception e)
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{
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e.printStackTrace ();
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out.println(showHtmlForError(e.toString()));
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}
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}
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}
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// Gets the parameters from an HTTP servlet request.
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private static Hashtable getRequestParameters (HttpServletRequest request)
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{
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Hashtable parameters = new Hashtable ();
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Enumeration enum = request.getParameterNames();
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while (enum.hasMoreElements())
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{
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String key = (String) enum.nextElement();
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String value = request.getParameter (key);
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parameters.put (key, value);
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}
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return parameters;
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}
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// Get the servlet information.
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public String getServletInfo()
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{
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return "HTMLFormConverterExample";
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}
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// Perform initialization steps.
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public void init(ServletConfig config)
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{
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try
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{
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super.init(config);
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// Register the JDBC driver
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try
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{
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DriverManager.registerDriver(new AS400JDBCDriver());
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}
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catch (Exception e)
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{
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System.out.println("JDBC Driver not found");
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}
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}
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catch (Exception e)
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{
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e.printStackTrace();
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}
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}
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// Set the page header info.
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private String showHeader(String title)
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{
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StringBuffer page = new StringBuffer();
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page.append("<html><head><title>" + title + "</title>");
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page.append("</head><body bgcolor=\"blanchedalmond\">");
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return page.toString ();
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}
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// Show the HTML page with the appropriate error information.
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private String showHtmlForError(String message)
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{
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String title = "Error";
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StringBuffer page = new StringBuffer();
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page.append (showHeader (title));
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try
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{
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// Create the HTML Form object
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HTMLForm errorForm = new HTMLForm("HTMLFormConverterExample");
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// Set up so that doPost() gets called when the form is submitted.
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errorForm.setMethod(HTMLForm.METHOD_POST);
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// Create a single-column panel to which the
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// HTML elements will be added.
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GridLayoutFormPanel grid = new GridLayoutFormPanel();
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// Create the text element for the error and add it to the panel.
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HTMLText text = new HTMLText(message);
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text.setBold(true);
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text.setColor(Color.red);
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grid.addElement(text);
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// Create the button to return to main and add it to the panel.
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grid.addElement(new SubmitFormInput("returnToMain", "Return to Main"));
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|
|
// Add the panel to the HTML form.
|
||
|
|
errorForm.addElement(grid);
|
||
|
|
|
||
|
|
page.append(errorForm.toString());
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
e.printStackTrace ();
|
||
|
|
}
|
||
|
|
page.append("</body></html>");
|
||
|
|
return page.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// Show the HTML form for an individual record.
|
||
|
|
private String showHtmlForRecord(HTMLTable[] htmlTable, int position)
|
||
|
|
{
|
||
|
|
String title = "HTMLFormConverter Example";
|
||
|
|
StringBuffer page = new StringBuffer();
|
||
|
|
page.append (showHeader (title));
|
||
|
|
|
||
|
|
page.append("<h1>" + title + "</h1>");
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
// Create the HTML Form object
|
||
|
|
HTMLForm recForm = new HTMLForm("HTMLFormConverterExample");
|
||
|
|
|
||
|
|
// Set up so that doPost() gets called when the form is submitted.
|
||
|
|
recForm.setMethod(HTMLForm.METHOD_POST);
|
||
|
|
|
||
|
|
// Set up a single-column panel layout, within which to arrange
|
||
|
|
// the generated HTML elements.
|
||
|
|
GridLayoutFormPanel grid = new GridLayoutFormPanel();
|
||
|
|
|
||
|
|
// Create and add a table caption that keeps track
|
||
|
|
// of the current record.
|
||
|
|
HTMLText recNumText = new HTMLText("Record number: " + (position + 1));
|
||
|
|
recNumText.setBold(true);
|
||
|
|
grid.addElement(recNumText);
|
||
|
|
|
||
|
|
// Set up a two-column panel layout, within which to arrange
|
||
|
|
// the table and text to comment on the converter output.
|
||
|
|
GridLayoutFormPanel tableGrid = new GridLayoutFormPanel(2);
|
||
|
|
tableGrid.addElement(htmlTable[position]);
|
||
|
|
HTMLText comment = new HTMLText(" <---- Output from the HTMLFormConverter class");
|
||
|
|
comment.setBold(true);
|
||
|
|
comment.setColor(Color.blue);
|
||
|
|
tableGrid.addElement(comment);
|
||
|
|
|
||
|
|
// Add the table line to the panel.
|
||
|
|
grid.addElement(tableGrid);
|
||
|
|
|
||
|
|
// Set up a single-row panel layout, within which to arrange
|
||
|
|
// the buttons for moving through the record list.
|
||
|
|
LineLayoutFormPanel buttonLine = new LineLayoutFormPanel();
|
||
|
|
buttonLine.addElement(new SubmitFormInput("getFirstRecord", "First"));
|
||
|
|
buttonLine.addElement(new SubmitFormInput("getPreviousRecord", "Previous"));
|
||
|
|
buttonLine.addElement(new SubmitFormInput("getNextRecord", "Next"));
|
||
|
|
buttonLine.addElement(new SubmitFormInput("getLastRecord", "Last"));
|
||
|
|
|
||
|
|
// Set up another single-row panel layout for the
|
||
|
|
// Return To Main button.
|
||
|
|
LineLayoutFormPanel returnToMainLine = new LineLayoutFormPanel();
|
||
|
|
returnToMainLine.addElement(new SubmitFormInput("returnToMain", "Return to Main"));
|
||
|
|
|
||
|
|
// Add the lines containing the buttons to the grid panel.
|
||
|
|
grid.addElement(buttonLine);
|
||
|
|
grid.addElement(returnToMainLine);
|
||
|
|
|
||
|
|
// Add the panel to the form.
|
||
|
|
recForm.addElement(grid);
|
||
|
|
|
||
|
|
// Add the form to the HTML page.
|
||
|
|
page.append(recForm.toString());
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
e.printStackTrace ();
|
||
|
|
}
|
||
|
|
|
||
|
|
page.append("</body></html>");
|
||
|
|
return page.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// Show the main HTML form (request input for system, file,
|
||
|
|
// and library name).
|
||
|
|
private String showHtmlMain()
|
||
|
|
{
|
||
|
|
String title = "HTMLFormConverter Example";
|
||
|
|
StringBuffer page = new StringBuffer();
|
||
|
|
page.append (showHeader (title));
|
||
|
|
|
||
|
|
page.append("<h1>" + title + "</h1>");
|
||
|
|
|
||
|
|
// Create the HTML Form object
|
||
|
|
HTMLForm mainForm = new HTMLForm("HTMLFormConverterExample");
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
// Set up so that doPost() gets called when the form is submitted.
|
||
|
|
mainForm.setMethod(HTMLForm.METHOD_POST);
|
||
|
|
|
||
|
|
// Add a brief description to the form.
|
||
|
|
HTMLText desc =
|
||
|
|
new HTMLText("<P>This example uses the HTMLFormConverter class " +
|
||
|
|
"to convert data retrieved from a server " +
|
||
|
|
"file. The converter produces an array of HTML " +
|
||
|
|
"tables. Each entry in the array is a record from " +
|
||
|
|
"the file. " +
|
||
|
|
"Records are displayed one at a time, " +
|
||
|
|
"giving you buttons to move forward or backward " +
|
||
|
|
"through the list of records.</P>");
|
||
|
|
mainForm.addElement(desc);
|
||
|
|
|
||
|
|
// Add instructions to the form.
|
||
|
|
HTMLText instr =
|
||
|
|
new HTMLText("<P>Please input the name of the server, " +
|
||
|
|
"and the file and library name for the file you " +
|
||
|
|
"wish to access. Then push the Show Records " +
|
||
|
|
"button to continue.</P>");
|
||
|
|
mainForm.addElement(instr);
|
||
|
|
|
||
|
|
|
||
|
|
// Create a grid layout panel and add the system, file
|
||
|
|
// and library input fields.
|
||
|
|
GridLayoutFormPanel panel = new GridLayoutFormPanel(2);
|
||
|
|
|
||
|
|
LabelFormElement sysPrompt = new LabelFormElement("Server: ");
|
||
|
|
TextFormInput system = new TextFormInput("System");
|
||
|
|
system.setSize(10);
|
||
|
|
|
||
|
|
LabelFormElement filePrompt = new LabelFormElement("File name: ");
|
||
|
|
TextFormInput file = new TextFormInput("File");
|
||
|
|
file.setSize(10);
|
||
|
|
|
||
|
|
LabelFormElement libPrompt = new LabelFormElement("Library name: ");
|
||
|
|
TextFormInput library = new TextFormInput("Library");
|
||
|
|
library.setSize(10);
|
||
|
|
|
||
|
|
panel.addElement(sysPrompt);
|
||
|
|
panel.addElement(system);
|
||
|
|
panel.addElement(filePrompt);
|
||
|
|
panel.addElement(file);
|
||
|
|
panel.addElement(libPrompt);
|
||
|
|
panel.addElement(library);
|
||
|
|
|
||
|
|
// Add the panel to the form.
|
||
|
|
mainForm.addElement(panel);
|
||
|
|
|
||
|
|
// Create the submit button and add it to the form.
|
||
|
|
mainForm.addElement(new SubmitFormInput("getRecords", "Show Records"));
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
e.printStackTrace ();
|
||
|
|
}
|
||
|
|
|
||
|
|
page.append(mainForm.toString());
|
||
|
|
page.append("</body></html>");
|
||
|
|
|
||
|
|
return page.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
}</pre>
|
||
|
|
<p>The HTML generated by the above example looks like this:</p>
|
||
|
|
<pre><table border="0">
|
||
|
|
<tr>
|
||
|
|
<td><b>Record number: 1</b></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><table border="0">
|
||
|
|
<tr>
|
||
|
|
<td><table border="3" cellpadding="2" cellspacing="4">
|
||
|
|
<tr>
|
||
|
|
<th>CUSNUM</th>
|
||
|
|
<td>839283</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>LSTNAM</th>
|
||
|
|
<td>Jones </td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>INIT</th>
|
||
|
|
<td>B D</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>STREET</th>
|
||
|
|
<td>21B NW 135 St</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>CITY</th>
|
||
|
|
<td>Clay </td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>STATE</th>
|
||
|
|
<td>NY</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>ZIPCOD</th>
|
||
|
|
<td>13041</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>CDTLMT</th>
|
||
|
|
<td>400</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>CHGCOD</th>
|
||
|
|
<td>1</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>BALDUE</th>
|
||
|
|
<td>100.00</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<th>CDTDUE</th>
|
||
|
|
<td>0.00</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
<td><font color="#0000ff"> <b><!-- Output from the HTMLFormConverter class-->
|
||
|
|
</b></font></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<form>
|
||
|
|
<td><input type="submit" name="getFirstRecord" value="First" />
|
||
|
|
<input type="submit" name="getPreviousRecord" value="Previous" />
|
||
|
|
<input type="submit" name="getNextRecord" value="Next" />
|
||
|
|
<input type="submit" name="getLastRecord" value="Last" />
|
||
|
|
<br />
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td><input type="submit" name="returnToMain" value="Return to Main" />
|
||
|
|
<br />
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</form></pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|