编了一段很小的程序，报了一个很低级的错误（编译通过）__Application_java_caucho_server_http_

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编了一段很小的程序，报了一个很低级的错误（编译通过）

来源: 互联网发布时间：2015-04-23

本文导语: ////////一个servlet package upload; import java.io.*; import javax.servlet.Servlet; import javax.servlet.ServletException; import javax.servlet.http.*; //import iecworl.jutil.Common; public class upload { private DataInputStream in=null; //private ByteArrayInput...

////////一个servlet

package upload;
import java.io.*;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.*;
//import iecworl.jutil.Common;

public class upload
{
  private DataInputStream in=null;
  //private ByteArrayInputStream bin=null;
  private FileOutputStream fileWrite=null;

  private String contentType;
  private String fileContent="";
  private int formDataLength;

  private static final int SMALL_MAX_SIZE=102400;
  private static final int BIG_MAX_SIZE=512000;

  public void doPost(
    HttpServletRequest request,
  HttpServletResponse response
    ) throws ServletException, IOException
  {

    java.io.PrintWriter out = new PrintWriter(response.getWriter());
    contentType = request.getContentType();
    if (contentType==null || contentType.toLowerCase().indexOf("multipart/form-data")==-1)
    {
       out.println("mime类型不正确!");
    }
    formDataLength = request.getContentLength();
    in = new DataInputStream(request.getInputStream());
    byte dataBytes[] = new byte[formDataLength];
    //bin = new ByteArrayInputStream(dataBytes);

    out.println(String.valueOf(formDataLength));
  }
}

---------------
编译通过，
在浏览器里，报错
500 Servlet Exception
javax.servlet.ServletException: `upload.upload' must implement javax.servlet.Servlet
at com.caucho.server.http.Application.instantiateServlet(Application.java:2842)
at com.caucho.server.http.Application.createServlet(Application.java:2753)
at com.caucho.server.http.Application.loadServlet(Application.java:2711)
at com.caucho.server.http.Application.getFilterChainServlet(Application.java:2478)
at com.caucho.server.http.Application.buildFilterChain(Application.java:2445)
at com.caucho.server.http.Invocation.service(Invocation.java:276)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:129)
at com.caucho.server.http.ServletServer.serviceTop(ServletServer.java:847)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:213)
at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:158)
at com.caucho.server.TcpConnection.run(TcpConnection.java:140)
at java.lang.Thread.run(Thread.java:484)

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Resin 2.0.4 (built Thu Nov 15 17:56:24 PST 2001)

public class upload
{
.
.
.
}
if class upload is a servlet,
you must extends javax.servlet.http.HttpServlet or it's subclass