ch03,eg.TimeServlet3.
I press the summary button,but it can't display correct.It only
display the last message.why?
the sourse code:
/**********************TimeServlet3.java*********** ****************/
/*
* Created on 2004-2-9
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
/**
* @author William
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
import Charge;
import java.util.Enumeration;
import java.util.Hashtable;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
public class TimeServlet3 extends HttpServlet{
public void init(){
log("init was called");
}
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
log("doGet called");
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("<html>");
out.println("<head><title>");
out.println("Time Entry System");
out.println("</head></title>");
out.println("<body>");
out.println("<h0>welcome to the sssss</h0>");
out.println("<form action=TimeServlet3 method=POST>");
HttpSession session=request.getSession();
String event=request.getParameter("EVENT");
if(event==null){
event="ENTER_RECORD";
}else if(event.equals("")){
event="ENTER_RECORD";
}
if(event.equals("ENTER_RECORD")){
out.println("<h3>Enter Charge Record</h3>");
out.println("<p>User Name<input type=text name=name>");
out.println("<p>Project<input type=text name=project>");
out.println("<p>Hours<input type=text name=hours>");
out.println("<p>Date<input type=text name=date>");
out.println("<input type=hidden name=EVENT value=NEW_RECORD>");
out.println("<p><input type=submit>");
out.println("<input type=reset");
}else if(event.equals("NEW_RECORD")){
out.println("<h3>Your Charge Record has been saved</h3>");
String name=request.getParameter("name");
String project=request.getParameter("project");
String hours=request.getParameter("hours");
String date=request.getParameter("date");
Charge c=new Charge();
c.setDate(name);
c.setProject(project);
c.setHours(hours);
c.setDate(date);
Hashtable h=(Hashtable)session.getAttribute("charges");
if(h==null){
h=new Hashtable();
session.setAttribute("charges",h);
}
h.put(project,c);
out.println("Record Datail:<p>");
out.println("Name="+name+",Project="+project+",Hou rs="+hours+",Date="+date);
}else if (event.equals("SUMMARY")){
out.println("<h3>Summary of your Charge Records</h3>");
Hashtable h=(Hashtable)session.getAttribute("charges");
if(h!=null){
out.println("[list]");
Enumeration charges=h.keys();
while(charges.hasMoreElements()){
String proj=(String)charges.nextElement();
Charge ch=(Charge)h.get(proj);
out.println("<li>");
out.println("Name="+ch.getName());
out.println(",Project="+proj);
out.println(",hour="+ch.getHours());
out.println(",date="+ch.getDate());
}
out.println("</ul>");
}
}else if(event.equals("ADMIN")){
out.println("<h2>Administration Information</h2>");
out.println("<h3>Webapp and Servlet Engine Info</h3>");
ServletContext context=getServletContext();
out.println("[list]");
out.println("<li>Server Info:"+context.getServerInfo());
out.println("<li>Major Version:"+context.getMajorVersion());
out.println("<li>Minor Version:"+context.getMinorVersion());
out.println("<li>Webapp Init Parameters:");
Enumeration webappParams=context.getInitParameterNames();
out.println("[list]");
while(webappParams.hasMoreElements()){
String paramName=(String)webappParams.nextElement();
String paramValue=context.getInitParameter(paramName);
out.println("<li>"+paramName+"="+paramValue);
}
out.println("[list]");
out.println("<h3>Servlet Info:<h3>");
ServletConfig config=getServletConfig();
out.println("<li>Last Modified:"+getLastModified(request));
out.println("<li>Servlet Info"+getServletInfo());
out.println("<li>Servlet Name:"+config.getServletName());
out.println("<li>Servlet Init Parameters:");
Enumeration ServletParams=config.getInitParameterNames();
out.println("[list]");
while(ServletParams.hasMoreElements()){
String paramName=(String)ServletParams.nextElement();
String paramValue=config.getInitParameter(paramName);
out.println("<li>"+paramName+"="+paramValue);
}
out.println("</ul>");
out.println("</ul>");
}
out.println("</form>");
out.println("");
out.println("<form action=TimeServlet3 method=POST>");
out.println("<input type=hidden name=EVENT value=SUMMARY>");
out.println("<input type=submit value=Summary");
out.println("</form>");
out.println("</body>");
out.println("</html>");
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
log("doPost called");
doGet(request,response);
}
}
/************************************************** **********/
/**************************Charge.java************* **********/
import java.io.Serializable;
/*
* Created on 2004-2-9
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
/**
* @author William
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class Charge implements Serializable{
private String name;
private String project;
private String hours;
private String date;
public Charge(){}
public String getName(){
return name;
}
public void setName(String n){
name=n;
}
public String getProject(){
return project;
}
public void setProject(String proj){
project=proj;
}
public String getHours(){
return hours;
}
public void setHours(String h){
hours=h;
}
public String getDate(){
return date;
}
public void setDate(String d){
date=d;
}
}
/************************************************** ***/
can't display
