JSON- How to read json file in java

Question

I have a custom portlet with one dropdown item. Additionally i have a products.json file.

My Requirement

The dropdown shows the products and when the user clicks on a product, the corresponding details are fetched from the json file and displayed.

How do i do that ?

{
"products" : [  
  {  
     "id":"prod_1001",
     "name":" iPhone 6",
     "type":"Mobile",
     "asset_tag":"<asset_tag>",
     "serial_no":"34238941",
     "cost_center":"",
     "cpu_count":"2",
     "cpu_socket":"8",
     "cpu_name":"Intel",
     "cpu_type":"core",
     "cpu_speed_mhz":"2200",
     "disk_gb":"64",
     "ram_mb":"2048",
     "first_discoverd_date":"",
     "recent_discovery_date":"",
     "service_start_date":"",
     "warrent_expiry_date":"",
     "ip_address":"10.10.10.1",
     "lease_contract":"",
     "lease_start_date":"",
     "lease_end_date":"",
     "location":"India",
     "sku":"IPHONE-6",
     "cost":"500",
     "currency":"$",
     "cpu":"",
     "power_supply":"12v",
     "hard_drive":"1",
     "memory":[  
        {  
           "memory_type":"ram",
           "sku":"RAM-4GB"
        },
        {  
           "memory_type":"Internal",
           "sku":"INTERNAL-128GB"
        }
     ],
     "warranty_expiration":"",
     "gps_location":"India",
     "network_domain":"domain",
     "network_segment":"segment",
     "group":"Product",
     "company":"Apple"
  },
  {  
     "id":"prod_1005",
     "name":"Nokia",
     "type":"Mobile",
     "asset_tag":"<asset_tag>",
     "serial_no":"34238941",
     "cost_center":"",
     "cpu_count":"2",
     "cpu_socket":"8",
     "cpu_name":"Intel",
     "cpu_type":"core",
     "cpu_speed_mhz":"2200",
     "disk_gb":"32",
     "ram_mb":"2048",
     "first_discoverd_date":"",
     "recent_discovery_date":"",
     "service_start_date":"",
     "warrent_expiry_date":"",
     "ip_address":"10.10.10.1",
     "lease_contract":"",
     "lease_start_date":"",
     "lease_end_date":"",
     "location":"India",
     "sku":"IPHONE-6",
     "cost":"500",
     "currency":"$",
     "cpu":"",
     "power_supply":"12v",
     "hard_drive":"1",
     "memory":[  
        {  
           "memory_type":"ram",
           "sku":"RAM-4GB"
        },
        {  
           "memory_type":"Internal",
           "sku":"INTERNAL-128GB"
        }
     ],
     "warranty_expiration":"",
     "gps_location":"India",
     "network_domain":"domain",
     "network_segment":"segment",
     "group":"Product",
     "company":"Microsoft"
  },

Use a json library such as Jackson. What is your technology stack? — Nazaret K., May 02 '16 at 07:25

score 0 · Accepted Answer · answered May 02 '16 at 07:30

0

You can use a number of JSON libraries like the json maven library available here

You can use them to convert JSON strings to JSONObjects and use accessor methods defined in those objects to parse through the JSON Data

answered May 02 '16 at 07:30

Akshay Shenoy

119
8

score 0 · Answer 2 · answered May 02 '16 at 08:31

Also try Gson libray

You have 2 choices:

create a Product javabean by yourself and get result as a list
get result list as a generic map

List<Product> list = gson.fromJson(json, new TypeToken<List<Product>)(){}.getType());

or

Map<String, Object> map = gson.fromJson(json, new TypeToken<Map<String, Object>>(){}.getType());

JSON- How to read json file in java

2 Answers2