Java: How to Get Entity ContentType in HttpClient?

This code snippet show you how to get the content type of a result of executing an Http Get request. The

ContentType

 can be obtained by using 

ContentType.getOrDefault()

 method and passing an 

HttpEntity

 as the arguments. The 

HttpEntity

 can be obtained from the 

HttpResponse

 object.

From the 

ContentType

 object we can get the mime-type by calling the 

getMimeType()

 method. This method will return a string value. To get the charset we can call the 

getCharset()

 method which will return a

java.nio.charset.Charset

 object.

You need Apache HTTPComponents Library which you can download from here.

Another must reads:

• http://crunchify.com/how-to-send-http-request-and-capture-response-in-java/
• http://crunchify.com/simple-way-to-get-http-response-header-in-java/

package com.crunchify.tutorials;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.IOException;
import java.nio.charset.Charset;

/**
 * @author Crunchify.com
 */

public class CrunchifyGetHTTPContentType {
    public static void main(String[] args) {
    	CrunchifyGetHTTPContentType demo = new CrunchifyGetHTTPContentType();
        demo.requestCrunchifyPage();
        demo.requestCrunchifyLogo();
    }

    public void requestCrunchifyPage() {
        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet("http://crunchify.com");
        try {
            HttpResponse response = client.execute(request);
            HttpEntity entity = response.getEntity();
            showContentType(entity);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void requestCrunchifyLogo() {
        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet("http://crunchify.com/favicon.ico");
        try {
            HttpResponse response = client.execute(request);
            HttpEntity entity = response.getEntity();
            showContentType(entity);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void showContentType(HttpEntity entity) {
        ContentType contentType = ContentType.getOrDefault(entity);
        String mimeType = contentType.getMimeType();
        Charset charset = contentType.getCharset();

        System.out.println("\nMimeType = " + mimeType);
        System.out.println("Charset  = " + charset);
    }

}

Output:

MimeType = text/html
Charset  = UTF-8

MimeType = image/x-icon
Charset  = null

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