Question

我有一些像这样的输入值：

customername
    phone 
    email
    .....
     some items values
     itemname1
     itemname2
     ........

在每个项目名称中都有一些单位价格数量 ........

我试图像这样在json中编码这些值：

{
"info": {
    "customername": "abc",
    "phone": "123",
    "email": "an@gmail.com",

},
"item": {
    "itemname1": {
        "unitprice": "100",
        "qty": "3",

    },
    "itemname2": {
        "unitprice": "500",
        "qty": "2",

    }
}
}

我无法对上述所有值进行编码。

这是我的代码：

 private void jsonEncoding() throws JSONException {
        JSONObject obj = new JSONObject();
        JSONObject obj1 = new JSONObject();
        JSONObject obj2 = new JSONObject();


        try {
            obj1.put("name", name);
            obj1.put("email", email);
            obj1.put("phone", phone);


        } catch (JSONException e) {
            e.printStackTrace();
        }
        obj.put("info",obj1 );
        System.out.print(obj);

        System.out.print(obj1);
    }

如何编码上述json格式的值。

Answer 1

您可以通过两种方式实现：

使用Gson/Jackson等第三方库将POJO类数据转换为json object string（使用http://www.jsonschema2pojo.org/轻松创建POJO类）
手动执行JsonParsing，如下所示：

try {
// info node
JSONObject objInfo = new JSONObject();
objInfo.put("name", name);
objInfo.put("email", email);
objInfo.put("phone", phone);

// itemname1 node
JSONObject itemname1 = new JSONObject();
itemname1.put("unitprice", unitprice1);
itemname1.put("qty", qty1);

// itemname2 node
JSONObject itemname2 = new JSONObject();
itemname2.put("unitprice", unitprice2);
itemname2.put("qty", qty2);

// item node
JSONObject item = new JSONObject();

// adding itemname1 & itemname2 to item
item.put("itemname1",itemname1);
item.put("itemname2",itemname2);

// root node
JSONObject root = new JSONObject();
root.put("info",objInfo);
root.put("item",item);

System.out.print(root);

} catch(JsonException e){
     e.printStackTrace();
}

Answer 2

试试这可能会有所帮助

您需要创建三个类，因为您使用Gson意味着您将使用网络功能，因此可以实现以下所有类型化。

  class CustomObject implements Serializable {

      Info info;

      Map<String, ItemName> item;

      public CustomObject() {
          this(null, null);
      }

      public CustomObject(Info info, Map<String, ItemName> item) {
          this.info = info;
          this.item = item;
      }

      public Info getInfo() {
          return info;
      }

      public void setInfo(Info info) {
          this.info = info;
      }

      public Map<String, ItemName> getItem() {
          return item;
      }

      public void setItem(Map<String, ItemName> item) {
          this.item = item;
      }
  }

  class Info implements Serializable {

      String customername;
      String phone;
      String email;

      public Info() {
          this("","","");
      }

      public Info(String customername, String phone, String email) {
          this.customername = customername;
          this.phone = phone;
          this.email = email;
      }

      public String getCustomername() {
          return customername;
      }

      public void setCustomername(String customername) {
          this.customername = customername;
      }

      public String getPhone() {
          return phone;
      }

      public void setPhone(String phone) {
          this.phone = phone;
      }

      public String getEmail() {
          return email;
      }

      public void setEmail(String email) {
          this.email = email;
      }
  }



  class ItemName implements Serializable {

      String unitprice;
      String qty;

      public ItemName() {
          this("", "");
      }

      public ItemName(String unitprice, String qty) {
          this.unitprice = unitprice;
          this.qty = qty;
      }

      public String getUnitprice() {
          return unitprice;
      }

      public void setUnitprice(String unitprice) {
          this.unitprice = unitprice;
      }

      public String getQty() {
          return qty;
      }

      public void setQty(String qty) {
          this.qty = qty;
      }
      }

现在您必须根据需要添加数据，如下所示。

    CustomObject customObject = new CustomObject();

    Info info = new Info();

    info.setCustomername("abc");
    info.setPhone("123");
    info.setEmail("an@gmail.com");

    customObject.setInfo(info);

    ItemName itemname1 = new ItemName();

    itemname1.setUnitprice("100");
    itemname1.setQty("3");

    ItemName itemname2 = new ItemName();

    itemname2.setUnitprice("500");
    itemname2.setQty("2");

    Map<String, ItemName> item = new HashMap<>();

    item.put("itemname1", itemname1);
    item.put("itemname2", itemname2);

    customObject.setItem(item);

    System.out.println(new Gson().toJson(customObject));

以上System.out.println将输出显示为

    {
      "info":
         {
             "customername":"abc",
             "phone":"123",
             "email":"an@gmail.com"},
       "item":{
             "itemname1":
                         {
                           "unitprice":"100",
                           "qty":"3"
                         },
             "itemname2":
                         {
                           "unitprice":"500",
                           "qty":"2"
                          }
             }
     }

现在如何解析从服务器或任何源到该CustomObject类的字符串。通过谷歌通过Gson库非常简单。

     String str = "{\n" +
            "        \"info\":\n" +
            "                {\n" +
            "                    \"customername\":\"abc\",\n" +
            "                    \"phone\":\"123\",\n" +
            "                    \"email\":\"an@gmail.com\"\n" +
            "                },\n" +
            "        \"item\": \n" +
            "                {\n" +
            "                    \"itemname1\":\n" +
            "                    {\n" +
            "                        \"unitprice\":\"100\",\n" +
            "                        \"qty\":\"3\"\n" +
            "                    },\n" +
            "                    \"itemname2\":\n" +
            "                    {\n" +
            "                        \"unitprice\":\"500\",\n" +
            "                        \"qty\":\"2\"\n" +
            "                    }\n" +
            "                }\n" +
            "    }";

       CustomObject customObject = new Gson().fromJson(str, new TypeToken<CustomObject>(){}.getType());

       System.out.println(new Gson().toJson(customObject));

如何使用java在json中编码输入值

2 个答案: