[急啊！]小弟学做的留言板无法显示过来看看谢谢先

index.html提交到哪个页面？？哪个页面的代码和所用到的类代码贴出来~

解决方案 »

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谢谢2位的帮助了先index.html提交到AddMessageServlet.java再交给ViewMessageServlet.java
  最后交给viewMessage.jsp页面来显示
你的index.html中form的action就直接写的是AddMessageServlet.java？这样是不行的，提交给servlet的话，需要先在web.xml中进行serlvet的配置，然后根据url-pattern的写法来提交。你看看书，写的还是满详细的。
以下是我的代码：麻烦大哥们帮小弟看一下谢了
index.html文件：
保在xujsp/index.html
<html>
<head><title>我的第一个留言板的例子</title></head>
<body>
<table width="90%" align="cnter" border=1 cellspacing=0 bordercolordark="#cccc99"
borderclorling="#cccc99">
<tr>
<td align="center" bgcolor="#cccc99">徐赠留言板</td>
</tr>
<tr>
<td><table align="center" border=1 cellspacing="0" cellpadding=0
    bordercolordark="#cccc99" bordercolorlight="#cccc99">
<form action="addMessages_servlet">
<tr>
<td>姓名:</td>
<td bgcolor="#cccc99"><input type="text" name="name" size=25>
</td>
</tr>
<tr>
<td bgcolor="#cccc99">E-mail:</td>
<td bgcolor="#cccc99"><input type="text" name="email" size=25></td>
</tr>
<tr>
<td>主题:</td>
<td bgcolor="#cccc99"><input type="text" name="title" size=25></td>
</tr>
<tr>
<td valign=top bgcolor="#cccc99">留言:</td>
<td><textarea name="content" rows=7 cols=25></textarea></td>
</tr>
<tr>
<TR>
<TD colspan=3>
<table align=center width="100%" cellspacing=0 cellpadding=0
bordercolordark="#cccc99" bordercolorlight="#cccc99">
<tr>
<td align="center" bgcolor="#cccc99"><input type="submit" value="提交留言"></td>
<TD align="center"><a href="viewMessages.jsp"><font size=2>查看留言</font></a></TD>
<td align="center" bgcolor="#cccc99"><input type="reset" value="重新填写"></td>
</tr>
</table>
</td>
</tr>
</form>
</table></td>
</tr>
</table>
</body>viewMessage.jsp文件如下：
保在xuhui/viewMessage.jsp
<%@ page import="java.sql.*,java.util.*,javax.servlet.*,javax.servlet.http.*"%>
<HTML>
<HEAD>
<TITLE> show the message in the table </TITLE>
</HEAD>
<LINK href="..\..\hellking.css" type=text/css rel=stylesheet>
<BODY>
<p align="center">所有访客留言</p>
<hr>
<%
int message_count=0;
Collection messages=(Collection)request.getAttribute("messages");
Iterator it=messages.iterator();
while(it.hasNext())
{
   MessageVO message=(MessageVO)it.next();
%>
<TABLE  width="100%" align="center" border=1 brcolor=99ccff cellspacing="0" cellpadding="0" bordercolordark="#000000" bordercolorlight="#CCCC99">
<tr><td bgcolor="#CCCC99"><font size=2>主题：</font></td>
<td colspan=3><%=message.getTitle()%></td></tr>
<tr><td bgcolor="#CCCC99"><font size=2>留言人：</font></td>
<td><%=message.getName()%></td><td bgcolor="#CCCC99"><font size=2>E-mail：</font></td>
<td>
<%
out.println("<a href=mailto:"+message.getEmail()+">"+message.getEmail()+"</a>");
%>
</td></tr>
<tr><td bgcolor="#CCCC99"><font size=2>留言时间：</font></td><td colspan=3>
<%
out.println("<font size=2>"+message.getDate().toLocaleString()+"</font>");
%>
</td></tr>
<tr><td align="center">
<%
out.println("("+message_count+")");
%>
</td>
<td colspan=3><%=message.getContent()%>
</td></tr>
</table>
<%
out.println("<hr>");
message_count++;
}
%>
<p align="center"><a href="index.html">我要留言</a></p>
</body>
</html>
web.xml文件：
xuhui/WEB-INF/web.xml;
<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2_3.dtd"><web-app><servlet>
        <servlet-name>ViewMessageServlet</servlet-name>
        <servlet-class>ViewMessageServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>AddMessageServlet</servlet-name>
        <servlet-class>AddMessageServlet</servlet-class>
    </servlet>
     <servlet-mapping>
        <servlet-name>ViewMessageServlet</servlet-name>
        <url-pattern>/viewMessages_servlet</url-pattern>
    </servlet-mapping>
     <servlet-mapping>
        <servlet-name>AddMessageServlet</servlet-name>
        <url-pattern>/addMessages_servlet</url-pattern>
    </servlet-mapping>
</web-app>MessageVO.java文件如下：
保在xuhui/WEB-INF/classes/MessageVO.java
public class MessageVO implements java.io.Serializable
{ private String name,email,title,content;
private java.sql.Date date;
public void setName(String name)
{
this.name=name;
}
public void setEmail(String email)
{
this.email=email;
}
public void setTitle(String title)
{
this.title=title;
}
public void setContent(String content)
{
this.content=content;
}
public String getName()
{
return this.name;
}

public String getContent()
{
return this.content;
}
public String getTitle()
{
return this.title;
}
public String getEmail()
{
return this.email;
}
public java.sql.Date getDate()
{
return this.date;
}
public void setDate(java.sql.Date date)
{
this.date=date;
}
}
AddMessage.java文件如下：
保在xuhui/WEB-INF/classes/AddMessageServlet.javaimport javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
import java.io.*;
public class AddMessageServlet extends HttpServlet
{ private Connection con;
public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {

     String name=request.getParameter("name");
String email=request.getParameter("email");
String title=request.getParameter("title");
String content=request.getParameter("content");
if(name==null)
name="";
if(title==null)
title="";
if(content==null)
content="";
if(email==null)
email="";
try
{
PreparedStatement stm=con.prepareStatement("insert into message values(?,?,?,?,?)");
stm.setString(1,title);
stm.setString(2,name);
if(email.length()==0)
stm.setString(5,null);
else stm.setString(5,email);
stm.setDate(3,new java.sql.Date(new java.util.Date().getTime()));
stm.setString(4,content);
    try
{
stm.executeQuery();
}
catch(Exception e)
{
                         System.out.println("xulovejsp");
} RequestDispatcher requestDispatcher = request.getRequestDispatcher("/viewMessages_servlet");
requestDispatcher.forward(request,response);
}
catch(Exception e)
{
e.printStackTrace();
}
} public void doPost(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
     doGet(request,response);
    }
    public   AddMessageServlet()
    {
     // String CLASSFORNAME="org.gjt.mm.mysql.Driver";
   //  String SERVANDDB="jdbc:mysql://localhost/wrox";
  //  String USER="root";
  //  String PWD="";
    try
    {

     Class.forName("org.gjt.mm.mysql.Driver").newInstance();
con = DriverManager.getConnection("jdbc:mysql://localhost/wrox","root","");
}
catch(Exception e)
{
e.printStackTrace();
}
}

}ViewMessageServlet.java文件如下：
保在xuhui/WEB-INF/classes/ViewMessageServlet.javaimport javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
import java.io.*;public class ViewMessageServlet extends HttpServlet
{
private Connection con;
//接收GET请求，执行数据库操作，保存结果到request中，把视图派发到下一个页面
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws IOException,ServletException
{
Collection ret=new ArrayList();
try
{
Statement stm=con.createStatement();
ResultSet result=stm.executeQuery("select count(*) from message");
int message_count=0;
if(result.next())
{
message_count=result.getInt(1);
result.close();
}
if(message_count>0)
{
result=stm.executeQuery("select*from message order by time desc");while(result.next())
{
String title=result.getString("title");
String name=result.getString("name");
String email=result.getString("email");
String content=result.getString("content");
java.sql.Date date=result.getDate("time");
MessageVO message=new MessageVO();
message.setName(name);
message.setTitle(title);
message.setContent(content);
message.setDate(date);
message.setEmail(email);
ret.add(message);
}
result.close();
stm.close();
}
//保存执行结果，把视图派发到目标
request.setAttribute("message",ret);
RequestDispatcher requestDispatcher=
request.getRequestDispatcher("/viewMessages.jsp");
requestDispatcher.forward(request,response);
}
catch(Exception e)
{
e.printStackTrace();
}
}
//初始化到数据库的连接
public ViewMessageServlet()
{
String CLASSFORNAME="org.gjt.mm.mysql.Driver";
String SERVANDDB="jdbc:mysql://localhost/wrox";
String USER="root";
String PWD="";
try
{
Class.forName(CLASSFORNAME).newInstance();
con=DriverManager.getConnection(SERVANDDB,USER,PWD);
}
catch(Exception e)
{
e.printStackTrace();
}
}
//和GET请求一处理一样
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws IOException,ServletException
{
doGet(request,response);
}
}
建议你使用日志,方便调试.
在AddMessageServlet.java检测一下,
String email=request.getParameter("email");
String title=request.getParameter("title");
String content=request.getParameter("content");
的取值.
你应该在viewMessage.jsp中添加你的两个java的类！然后把这两个类放在classes文件夹里！这样就应该能调出来了！
就是log，这里有几篇好的文章。你可以看一下。
<<Short introduction to log4j>>
http://logging.apache.org/log4j/docs/manual.html
还有车东的几篇学习笔记:
Log4J学习笔记（1）
http://www.infomall.cn/cgi-bin/mallgate/20040524/http://hedong.3322.org/archives/000193.html
Log4J学习笔记（2）
http://www.infomall.cn/cgi-bin/mallgate/20040524/http://hedong.3322.org/archives/000195.html
Log4J学习笔记（3）
http://www.infomall.cn/cgi-bin/mallgate/20040524/http://hedong.3322.org/archives/000197.htmlJakarta Commons Logging学习笔记
http://www.infomall.cn/cgi-bin/mallgate/20040524/http://hedong.3322.org/archives/000316.html
在tomcat中使用bean或servlet必须放到包内!
我刚试了上面（ccc425(小蛇）朋友的方法
可还是没有用啊
和以前一样
什么都没有啊真晕啊

[急啊！]小弟学做的留言板无法显示 过来看看 谢谢先

解决方案 »

[急啊！]小弟学做的留言板无法显示过来看看谢谢先