How to handle file upload window in Selenium?

I am working on a Selenium project and we have an upload button.

We want to handle the upload by Selenium. I have to use WebDriver only and there are two ways.

Make a POST request to the server. Make a GET request to the server. What is the best way to handle this? What is the pros and cons of the above options? 1) Make a POST request to the server. It will better if you make a POST request in your test cases. If you want to pass the values to your POST request, you need to use WebElement.sendKeys() method.

The code snippet is as follows. WebElement element = driver.findElement(By.id("id"));
Element.sendKeys("text"); 2) Make a GET request to the server. It is better to do it. If you want to pass the values to your GET request, you need to use WebElement.click() method.findElement(By.id("id"));
Element.click(); The above method will click the element if it exists on the webpage or it will throw an NoSuchElementException otherwise.

How do I close a file in Selenium?

In my Selenium test cases, I have many test pages with various files opened.

After a test is done, how do I close files that are in the working directory? I believe selenium IDE also provides this functionality but I am confused on how to close files if I don't use IDE.

I can't find any references in the documentation as far as the issue I'm having, but all the questions of Selenium IDE: How to delete a file opened via Selenium IDE? and How to close Selenium IDE webdriver session? are about Selenium IDE, not just Selenium standalone RC jar. Edit. I use Maven to build my application which is running Java, so I will need Maven to be installed. I want to use Maven's surefire plugin's verify goal. Here is my pom.xml :
. org.apache.maven.plugins
maven-surefire-plugin. 2. I actually also use the Jenkins Job plugin to build the project and if Jenkins builds my project, how do I tell Jenkins to run any test without Jenkins telling me to open up my browsers?