Re: Making Java Act Like A Form

From:

Lew <lew@nospam.lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 06 Feb 2007 23:59:11 -0500

Message-ID:

<37ydnaL1eZ4CwVTYnZ2dnUVZ_t6qnZ2d@comcast.com>

doug...@gmail.com wrote:

<%@ page language="java" import="org.apache.commons.httpclient.*,
org.apache.commons.httpclient.methods.*" %>

<%
   String url = "http://localhost:8080/printer.jsp";
   try {
    HttpClient client = new HttpClient();
    PostMethod method = new PostMethod( url );

         // Configure the form parameters
         method.addParameter( "p", "Java" );

         // Execute the POST method
    int statusCode = client.executeMethod( method );
    if( statusCode != -1 ) {
      String contents = method.getResponseBodyAsString();
      method.releaseConnection();
      System.out.println( contents );
    }
   }

   catch( Exception e ) {
    e.printStackTrace();
    out.println(e.toString());
   }

%>

Daniel Pitts wrote:

System.out.println does NOT print to the jsp output., try
"out.println" instead of "System.out.println"

%@ page language="java" import="org.apache.commons.httpclient.*,
org.apache.commons.httpclient.methods.*" %>

<%
   String url = "http://localhost:8080/printer.jsp";
   try {
    HttpClient client = new HttpClient();
    PostMethod method = new PostMethod( url );

         // Configure the form parameters
         method.addParameter( "p", "Java" );

         // Execute the POST method
    int statusCode = client.executeMethod( method );
    if( statusCode != -1 ) {
      String contents = method.getResponseBodyAsString();
      method.releaseConnection();
      out.println( contents );
    }
   }

   catch( Exception e ) {
    e.printStackTrace();
    out.println(e.toString());
   }

Why write this as JSP at all? You use nothing but scriptlet. If you wrote this
as a standard servlet, you'd probably find that existing methods like doPost()
will obviate the need to handle certain things yourself.

Take a gander at the Model-View-Controller, or "Model 2" paradigm for web
apps, as supported by Struts or JSF.

<http://java.sun.com/blueprints/guidelines/designing_enterprise_applications_2e/web-tier/web-tier5.html>

The JSF section of <http://java.sun.com/javaee/5/docs/tutorial/doc/>:
<http://java.sun.com/javaee/5/docs/tutorial/doc/JSFIntro.html#wp114889>

<http://struts.apache.org/>

- Lew