สอบถามการเขียนโค้ดในการอ่านไฟล์ json มายัง java ครับ

{
	"web_block":[
			{
				"url" : "www.facebook.com",
				"action" : "deny" 
			},
			{
				"url" : "www.google.com",
				"action" : "deny" 
			},
			{
				"url" : "www.youtube.com",
				"action" : "deny" 
			},
			{
				"url" : "www.wu.ac.th",
				"action" : "allow" 
			}
		],
	"port_block":[
			{
				"port" : "80",
				"protocol" : "tcp",
                "action" : "block"
			},
			{
				"port" : "443",
				"protocol" : "udp",
                "action" : "allow" 
			}
		],
       "user": [
                       {
                                "username" : "prasit"
                       }
               ]

}

	            JSONObject jsonObject = (JSONObject) obj;
	 
	            JSONArray web_block = (JSONArray) jsonObject.get("web_block");
	 
	            System.out.println("\nWeb block:");
	            System.out.println(web_block);
	            Iterator<String> iterator = web_block.iterator();
	            while (iterator.hasNext()) {
	                System.out.println(iterator.next());

	            }