Java USES HttpClient to simulate the application and considerations of POST form operations

HttpClient USES the post method to submit data source code:

package post;

import Java.io.IOException;

import org.apache.commons.httpclient.Header;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.HttpException;

import org.apache.commons.httpclient.HttpStatus;

import org.apache.commons.httpclient.NameValuePair;

import org.apache.commons.httpclient.methods.PostMethod;

public class PostHttp {

 /**

  * @param args

  */

 public static void main(String[] args) {

  // TODO Auto-generated method stub

  HttpClient httpClient = new HttpClient();

  String url = "http://193.167.13.21/setup.cgi";

  PostMethod postMethod = new PostMethod(url);

//    Fill in the values for each form field 

  NameValuePair[] data = {

    new NameValuePair("ID", "11"),

    new NameValuePair("mtg", "0"),

    new NameValuePair("haveCookie", "0"),

    new NameValuePair("backID", "30"),

    new NameValuePair("psw", "password")

  };

//    Put the value of the form in postMethod In the 

  postMethod.setRequestBody(data);

//    perform postMethod

  int statusCode = 0;

  try {

   statusCode = httpClient.executeMethod(postMethod);

  } catch (HttpException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  } catch (IOException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }

//   HttpClient For requests to accept subsequent services, like POST and PUT Cannot automatically handle forwarding 

//   301 or 302

  if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY)

  {

   //    Extract the address of the steering from the head 

   Header locationHeader = postMethod.getResponseHeader("location");

   String location = null;

   if (locationHeader != null) {

    location = locationHeader.getValue();

    System.out.println("The page was redirected to:" + location);

   }

   else {

    System.err.println("Location field value is null.");

   }

   return;

  }

  else

  {

         System.out.println(postMethod.getStatusLine());

         String str = "";

         try {

               str = postMethod.getResponseBodyAsString();

         } catch (IOException e) {

               // TODO Auto-generated catch block

               e.printStackTrace();

         }        

         System.out.println(str);

  }

  postMethod.releaseConnection();

        return ;

 }

}

// this is the login information of a user authentication process

Among the required jar packages:

1, httpclient commons - 3.1 - rc1. zip http: / / jakarta apache. org commons/httpclient/downloads html

2, commons codec - 1.3. jar       http: / / jakarta apache. org/site/downloads/downloads_commons - codec. cgi

. 3, commons logging - api jar     in tomcat5. 5 Tomcat in 5.5 / bin directory or       http: / / jakarta apache. org/site/downloads/downloads_commons - logging. cgi