高手指点，初学者问题。在线等待。__RequestResponseServlet_HTMLTable_append_StringBuffer_public_

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高手指点，初学者问题。在线等待。

来源: 互联网发布时间：2017-04-30

本文导语: 我有两个类药编译，这两个文件是HTMLTable.java和RequestResponseServlet.java, 其中RequestResponseServlet中用到HTMLTable类，编译HTMLTable时通过，编译RequestResponseServlet.java时出现如下错误，请问这是为什么？ C:Tomcat 4.1webappsservletAPIs...

我有两个类药编译，这两个文件是HTMLTable.java和RequestResponseServlet.java, 其中RequestResponseServlet中用到HTMLTable类，编译HTMLTable时通过，编译RequestResponseServlet.java时出现如下错误，请问这是为什么？

C:Tomcat 4.1webappsservletAPIservletsbasicServlets>javac RequestResponseServlet.java

RequestResponseServlet.java:48: cannot resolve symbol
symbol  : class HTMLTable
location: class basicServlets.RequestResponseServlet
    HTMLTable table = new HTMLTable();
    ^
RequestResponseServlet.java:48: cannot resolve symbol
symbol  : class HTMLTable
location: class basicServlets.RequestResponseServlet
    HTMLTable table = new HTMLTable();
                          ^
RequestResponseServlet.java:130: cannot resolve symbol
symbol  : class HTMLTable
location: class basicServlets.RequestResponseServlet
    HTMLTable table = new HTMLTable();
    ^
RequestResponseServlet.java:130: cannot resolve symbol
symbol  : class HTMLTable
location: class basicServlets.RequestResponseServlet
    HTMLTable table = new HTMLTable();

HTMLTable.java如下：
package BasicServlets;

public class HTMLTable
{
  private StringBuffer head;
  private StringBuffer rows;
  private StringBuffer foot;

  public HTMLTable()
  {
    head = new StringBuffer();
    head.append("");
    head.append("Attribute");
    head.append("Value");

    rows = new StringBuffer();

    foot = new StringBuffer();
    foot.append("");
  }

  public void appendTitleRow(String attribute)
  {
    rows.append("").append(attribute);
    rows.append("");
  }

  public void appendRow(String attribute, String value)
  {
    rows.append("").append(attribute);
    rows.append("").append(value).append("");
  }

  public void appendRow(String attribute, int value)
  {
    appendRow(attribute, new Integer(value).toString());
  }

  public void appendRow(String attribute, boolean value)
  {
    appendRow(attribute, new Boolean(value).toString());
  }

  public String toString()
  {
    return head.append(rows).append(foot).toString();
  }

  public StringBuffer toStringBuffer()
  {
    return head.append(rows).append(foot);
  }
}

RequestResponseServlet.java如下：
package basicServlets;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class RequestResponseServlet extends GenericServlet
{
  public void service(ServletRequest request, ServletResponse response)
    throws ServletException, IOException
  {
    StringBuffer requestTable = getRequestTable(request);
    StringBuffer responseTable = getResponseTable(request, response);

    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println("RequestResponseServlet");
    out.println("Request Information" + requestTable + "");
    out.println("Response Information" + responseTable);
    out.println("");
    out.close();
  }

  private StringBuffer getRequestTable(ServletRequest request)
  {
    HTMLTable table = new HTMLTable();

    table.appendTitleRow("Parameters");
    Enumeration e = request.getParameterNames();
    while (e.hasMoreElements())
    {
      String paramName = (String)e.nextElement();
      String[] paramValues = request.getParameterValues(paramName);
      if (paramValues != null)
      {
        for (int i = 0; i