How to use NameValuePair

NameValuePair is a class that represents a key-value pair, commonly used in constructing URL query strings, form data, or JSON request bodies to represent parameters in an HTTP request.

The NameValuePair class has two attributes: name and value, representing the key and value of the parameter, respectively.

The steps for using NameValuePair are as follows:

1. Create a NameValuePair object.
2. Create a new Key-Value pair with the specific key and value.
3. Add the NameValuePair object to the parameter list.
4. A list called params of type NameValuePair is created, and an element called param is added to the list.
5. Multiple NameValuePair objects can be added by iterating through them.
6. Convert the parameter list to a URL query string or form data:
7. Create a string by formatting the parameters in UTF-8 using URLEncodedUtils.
8. Here, the format method of the URLEncodedUtils class is used to convert the parameter list into a URL query string. The second parameter specifies the character encoding.
9. You can use the UrlEncodedFormEntity method of the HttpEntity class to convert a list of parameters into form data.
10. Convert the parameter list to a JSON request body.
11. Convert the parameters into a URL-encoded JSON string.
12. Here the toString method of the EntityUtils class is used to convert the parameter list into a string.

The use of NameValuePair allows for a more flexible and easily manageable construction of parameters. It is commonly used to pass parameters when interacting with servers.