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Java – How to download web page from internet?

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A simple Java source code to download a web page from the internet. JavaDownloadWebPage.java package com.mkyong; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; public class JavaDownloadWebPage { public static void main(String[] args) throws IOException { String result = downloadWebPage("https://mkyong.com"); System.out.println(result); } private static String downloadWebPage(String url) throws IOException { StringBuilder …

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How to get URL content in Java

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In this Java example, we show you how to get content of a page from URL “mkyong.com” and save it into local file drive, named “test.html”. package com.mkyong; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.InputStreamReader; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class GetURLContent { public static void main(String[] args) …

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How to open an URL in Android’s web browser

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Here’s a code snippet to show you how to use “android.content.Intent” to open an specify URL in Android’s web browser. button.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://mkyong.com")); startActivity(intent); } }); Note For full example, please refer to this – Android button example. References Android Button JavaDoc Android …

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RESTful Java client with java.net.URL

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In this tutorial, we show you how to create a RESTful Java client with Java build-in HTTP client library. It’s simple to use and good enough to perform basic operations for REST service. The RESTful services from last “Jackson + JAX-RS” article will be reused, and we will use “java.net.URL” and “java.net.HttpURLConnection” to create a …

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How to validate URL in Java

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A short example to show the use of apache.commons.validator.UrlValidator class to validate an URL in Java. import org.apache.commons.validator.UrlValidator; public class ValidateUrlExample{ public static void main(String[] args) { UrlValidator urlValidator = new UrlValidator(); //valid URL if (urlValidator.isValid("https://mkyong.com")) { System.out.println("url is valid"); } else { System.out.println("url is invalid"); } //invalid URL if (urlValidator.isValid("http://invalidURL^$&%$&^")) { System.out.println("url is valid"); …

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How to encode a URL string or form parameter in java

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This is always advisable to encode URL or form parameters; plain form parameter is vulnerable to cross site attack, SQL injection and may direct our web application into some unpredicted output. A URL String or form parameters can be encoded using the URLEncoder class – static encode (String s, String enc) method. For example, when …

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