Send Http Request In Java

[ramsun]

Hello, I want to know the details about the Sending Http Request In Java. I have search regarding this on internet, but I am not able to get the solution on it. If you are having more details about it, then please help me to achieve it. I will be thankful to you.

[Katty]

Hello, HttpRequest is one class in the java. It is having following methos which can be used by the user in your code:

• addHeader(java.lang.String line)
• close()
• getHeader(java.lang.String string)
• getInputStream()
• getMethod()
• getRequestURI()
• pushBack(byte[] buf, int start, int length)
• setContentLength(int contentLength)

[Katty]

Hello, you can simply make use of the code below for getting the solution for your problem:

String file_name = “test.html”;
URL url = new URL(”http://193.20.30.20/target_path”);
FileWriter filewriter = new FileWriter(file_name);
postData(new StringReader(xml_data), url, filewriter);

[kelfro]

Hello, I have the code below for sending the HTTP Request in java. You can simply make use of it and get your problem solved:

package HTTPUtil;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;
public class HTTPRequestPoster
{
public static String HttpRequest(String target, String reqpar)
{
String result = null;
if (target.startsWith("http://"))
{
try
{
StringBuffer sbufferfer = new StringBuffer();
String urlString = target;
if (reqpar != null && reqpar.length () > 0)
{
urlString += "?" + reqpar;
}
URL url = new URL(urlString);
URLConnection conn = url.openConnection ();
BufferedReader bufferferreader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuffer sb = new StringBuffer();
String line;
while ((line = bufferferreader.readLine()) != null)
{
sb.append(line);
}
bufferferreader.close();
result = sb.toString();
} catch (Exception e)
{
e.printStackTrace();
}
}
return result;
}
public static void postData(Reader sbufferfer, URL target, Writer output) throws Exception
{
HttpURLConnection httpurlcon = null;
try
{
httpurlcon = (HttpURLConnection) target.openConnection();
try
{
httpurlcon.setRequestMethod("POST");
} catch (ProtocolException e)
{
throw new Exception("Shouldn't happen: HttpURLConnection doesn't support POST??", e);
}
httpurlcon.setDoOutput(true);
httpurlcon.setDoInput(true);
httpurlcon.setUseCaches(false);
httpurlcon.setAllowUserInteraction(false);
httpurlcon.setRequestProperty("Content-type", "text/xml; charset=" + "UTF-8");
OutputStream out = httpurlcon.getOutputStream();
try
{
Writer writer = new OutputStreamWriter(out, "UTF-8");
pipe(sbufferfer, writer);
writer.close();
} catch (IOException e)
{
throw new Exception("IOException while posting sbufferfer", e);
} finally
{
if (out != null)
out.close();
}
InputStream in = httpurlcon.getInputStream();
try
{
Reader reader = new InputStreamReader(in);
pipe(reader, output);
reader.close();
} catch (IOException e)
{
throw new Exception("IOException while reading response", e);
} finally
{
if (in != null)
in.close();
}
} catch (IOException e)
{
throw new Exception("Connection error (is server running at " + target + " ?): " + e);
} 
finally
{
if (httpurlcon != null)
httpurlcon.disconnect();
}
}
private static void pipe(Reader reader, Writer writer) throws IOException
{
char[] buffer = new char[1024];
int read = 0;
while ((read = reader.read(buffer)) >= 0)
{
writer.write(buffer, 0, read);
}
writer.flush();
}
}

[Reegan]

For sending HTTP request you can simply make use of the code below:

URL url = new URL("http://www.techarena.in/url");
InputStream iStream = url.openStream();
try {
  ...
} finally 
{
  iStream.close();
}

[Praetor]

If you want to make use of the java for sending http request in java then you need to understand the code below:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
 
public class HTTPTesting {
    public static void main(String[] args) {
        String reqUrl = "http://www.TA.in";
        try {
            URL url = new URL(reqUrl.toString());
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(url.openStream()));
            String iLine;
            System.out.println("Started For the Response");
            while ((iLine = bufferedReader.readLine()) != null) {
                System.out.println(iLine);
            }
            bufferedReader.close();
            System.out.println("Completion of Response");
            
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}