customerimpl.java

本书通过实例介绍了嵌入式编程的方法与技巧书中例子具有实用性

import java.net.*;
import java.util.*;
import java.io.*;
import hp.chaiserver.*;
import java.sql.*;

public class CustomerImpl implements ICustomer, IChaiServer {

	public void initWorkerArgs(String name, IDaemon daemon, ArgVector args) {
		System.out.println("What is sysLogComand\t" + Utils.getSysLogCmd() + "\n");
	}

    // CustomerStore is an implementation of the method defined in ICustomer
    public void CustomerStore(String retFormat, ArgVector args, Environment env) {
        // The next two lines obtain utility objects from the environment
        // retStat is used to return status information
        // html is used to stream HTML data back to client
        HTMLStatus retStat = env.getErrResponder();
        HTMLHelper html = (HTMLHelper) env.getHTMLHelper();

		// The following lines extract an argument from the ArgVector
		// The CustomerString argument contains the String entered into the
		// form.

		String cname = args.getArg("cname");
		String address = args.getArg("address");
		String support = args.getArg("support");

		if((cname == null) || (address == null) || (support == null)) {
				retStat.sendError(400, "Insufficient Information");
				return;
		}
		// Customer name trim to 25 characters.
		if(cname.length() > 25){
			cname = cname.substring(0,24);
		}
		// Customer address trim to 60 characters.
		if(address.length() > 60){
			address = address.substring(0,59);
		}
		// Customer Support details trim to 60 characters.
		if(support.length() > 60){
			support = support.substring(0,59);
		}

		// The following lines check the return format specified by
		// client. This implementation supports HTML and Text.
		// An error is sent to the client if return format is not supported
           try {
			   if(retFormat.equalsIgnoreCase("html")) {
				   // startHTMLDoc sends the Header information to the client
				   html.startHTMLDoc();
				   // send a <HR> Tag
				   html.startTag("HR");
				   // send a <CENTER> Tag
				   html.startTag("CENTER");
				   // send contents of CustomerString formated as H1 in a paragraph
				   //html.appendSimpleHTMLPara(CustomerString, "H1");
				   // send a </CENTER> Tag
				   html.endTag("CENTER");
				   int count=0;
				   try {
					   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
					   java.sql.Connection conn = DriverManager.getConnection("jdbc:odbc:test2000");
					   Statement st = conn.createStatement();
					   ResultSet rs1= st.executeQuery("select count(*) from csd");

					   Calendar calendar = Calendar.getInstance();
					   String date = new String(calendar.get(Calendar.YEAR)+"-"+(calendar.get(Calendar.MONTH)+1)+"-"+calendar.get(Calendar.DATE));
					   String time = new String(calendar.get(Calendar.HOUR)+":"+calendar.get(Calendar.MINUTE)+":"+calendar.get(Calendar.SECOND));
					   String datetime = new String(date+" "+ time);
					   if(rs1.next()) {
						   count = rs1.getInt(1) + 1;
					   } else {
						   count = 1;
					   }
					   rs1.close();
					   html.startTag("CENTER");
					   html.appendSimpleHTMLPara("Customer Support", "H2");
					   html.endTag("CENTER");
					   int rs = st.executeUpdate("insert into csd values("+count+",'"+datetime+"','"+cname+"','"+address+"','"+support+"')");
					   st.close();
					   conn.close();
				    }catch(Exception e) { e.printStackTrace(); }
				    html.startNewHTMLParagraph();
				    html.appendSimpleHTMLPara("Your complaint is Registered", "H2");
				    html.appendSimpleHTMLPara("and your ticket no is :"+count, "H2");
				    // send a <HR> Tag
				    html.startTag("HR");
				    // send a sequence of tags to create a link to
				    // this server's homepage
				    html.sendHomeLink();
				    // send the end of document tags
				    html.endHTMLDoc();
				} else if(retFormat.equalsIgnoreCase("txt")) {
					// send the MIME header for a text document and
					// append the contents of CustomerString to the document
					html.sendText(cname);
				} else {
					//retStat.send400("Return type " + retFormat + " not supported");
					retStat.sendError(400, "Return type" + retFormat + "not supported");
				}
			}catch(IOException IO) {  }
	   }

     // homePage is an implementation of a method declared in hp.chaiserver.IChaiServer
     public void homePage(OutputStream out, Environment env) {
		 // get HTMLHelper object from Environment. Used for streaming HTML
		 HTMLHelper html = (HTMLHelper) env.getHTMLHelper();
		 //System.out.println("What is sysLogComand\t" + Utils.getSysLogCmd() + "\n");
		 try {
			 // send HTML document header
			 html.startHTMLDoc();
			 // send <CENTER> Tag
			 html.startTag("CENTER");
			 // send Heading String
			 //html.appendSimpleHTMLPara("Customer Object", "H1");
			 html.appendSimpleHTMLPara("Customer ChaiService", "H1");
			 // send </CENTER> Tag
			 html.endTag("CENTER");
			 // send <HR> Tag
			 html.startTag("HR");
			 // send Tag sequence to start a form
			 html.startForm("GET", "/this.customer");
			 // send <P> Tag
			 html.startNewHTMLParagraph();
			 // add Hidden field called CustomerStore
			 // Note this represents the Method name to be
			 // called when the form is submitted. See the
			 // CustomerStore method above.
			 html.addHiddenField("CustomerStore", "html"); // Method and return type
			 // add a Text field called CSEID
			 // Note this represents the argument CSEID
			 // accessed in the CustomerStore method above.
			 html.appendSimpleHTMLPara("Customer Name: ", "H3");
			 html.addTextField("cname", 30, null);
			 html.startNewHTMLParagraph();
			 html.appendSimpleHTMLPara("Address: ", "H3");
			 html.addTextField("address", 60, null);
			 html.appendSimpleHTMLPara("Support Required/Problem:", "H3");
			 html.addTextField("support", 60, null);

			 // send <P> Tag
			 html.startNewHTMLParagraph();
			 // add a Submit button and reset button
			 html.addSubmitButton("Submit");
			 html.addResetButton();
			 // send the </FORM> tag
			 html.endForm();
			 // send <HR> Tag
			 html.startTag("HR");
			 // send a sequence of Tags for a link to
			 // the home page of the local server
			 html.sendHomeLink(); // send end of document Tags
			 html.endHTMLDoc();
		 }catch (IOException io) {  }
	 }

	 // Export is an implementation of a method declared in hp.chaiserver.IChaiServer
	 public void exportMethods(OutputStream out, String str, Environment env) {
		 // get HTMLHelper object from Environment. Used for streaming HTML
		 HTMLHelper html = (HTMLHelper) env.getHTMLHelper();
		 if(str.equalsIgnoreCase("html")) {
			 try {
				 // send HTML document header
				 html.startHTMLDoc();
				 // send <CENTER> Tag
				 html.startTag("CENTER");
				 // send Heading String
				 html.appendSimpleHTMLPara("Customer ChaiService", "H1");
				 // send </CENTER> Tag
				 html.endTag("CENTER");
				 // send <HR> Tag
				 html.startTag("HR");
				 html.appendSimpleHTMLPara("Method support: CustomerStore", "H3");
				 html.appendSimpleHTMLPara("Argument: CustomerString", "H3");
				 html.sendHomeLink(); // send end of document Tags
				 html.endHTMLDoc();
			  }catch(IOException io) {}
		  } else if(str.equalsIgnoreCase("txt")) {
			  try {
				  html.sendText("Method: CustomerStore\nArgument: CustomerString");
				  } catch(IOException io) {  }
		  } else {
			HTMLStatus retStat = env.getErrResponder();
			retStat.sendError(400);
		  }
      }
 }