JSON-如何在java中读取json文件

Question

我有一个带有一个下拉项的自定义portlet。此外，我还有一个products.json文件。

我的需求

下拉列表显示产品，当用户单击产品时，相应的详细信息将从json文件中获取并显示。

我该怎么做？

{
"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"
  },

Answer 1

您可以使用许多JSON库，如可用的这里

您可以使用它们将JSON字符串转换为JSONObjects，并使用那些对象中定义的访问器方法来解析JSON数据

Answer 2

也可以试试Gson 李布雷

你有两个选择：

• 自己创建一个并以列表的形式获得结果
• 将结果列表作为通用映射获取

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

或

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