[ Java 常見問題 ] HttpClient - HTTP POST using JSON in Java

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Question 
I would like to make a simple HTTP POST using JSON in Java. Let's say the URL is www.site.com and it takes in the value {"name":"myname","age":"20"} labeled as 'details' for example. How would I go about creating the syntax for the POST? I also can't seem to find a POST method in the JSON Javadocs. 

How-To 
Here is what you need to do: 

1. Get the Apache HttpClient, this would enable you to make the required request
2. Create an HttpPost request with it and add the header "application/x-www-form-urlencoded"
3. Create a StringEntity that you will pass JSON to it
4. Execute the call

The code roughly looks like (you will still need to debug it and make it work): 

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1. HttpClient httpClient = HttpClientBuilder.create().build(); //Use this instead   
2.   
3. try {  
4.   
5.     HttpPost request = new HttpPost("http://yoururl");  
6.     StringEntity params =new StringEntity("details={\"name\":\"myname\",\"age\":\"20\"} ");  
7.     request.addHeader("content-type", "application/x-www-form-urlencoded");  
8.     request.setEntity(params);  
9.     HttpResponse response = httpClient.execute(request);  
10.   
11.     //handle response here...  
12.   
13. }catch (Exception ex) {  
14.   
15.     //handle exception here  
16.   
17. } finally {  
18.     //Deprecated  
19.     //httpClient.getConnectionManager().shutdown();   
20. }  

Supplement 
* How to convert hashmap to JSON object in Java