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426

Chapter 16 Using HTML Forms

Listing 16.9 EchoServer.java (continued)

       "Here is the request line and request headers\n" +

       "sent by your browser:\n" +

       "
");
  }
  // Print bottom of a standard Web page.
  
  private void printTrailer(PrintWriter out) {
    out.println
      ("
\n" +

       "\n" +

       "\n");

  }

  // Normal Web page requests use GET, so this

  // server can simply read a line at a time.

  // However, HTML forms can also use POST, in which

  // case we have to determine the number of POST bytes

  // that are sent so we know how much extra data

  // to read after the standard HTTP headers.

  private boolean usingPost(String[] inputs) {

    return(inputs[0].toUpperCase().startsWith("POST"));

  }

  private void readPostData(String[] inputs, int i,

                            BufferedReader in)

      throws IOException {

    int contentLength = contentLength(inputs);

    char[] postData = new char[contentLength];

    in.read(postData, 0, contentLength);

    inputs[++i] = new String(postData, 0, contentLength);

  }

  // Given a line that starts with Content Length,

  // this returns the integer value specified.

  private int contentLength(String[] inputs) {

    String input;

    for (int i=0; i