如何循环遍历保存在 JSONObject 中的数据数组，并将其放入 JSONArray 中？

huangapple
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英文:

How to loop over an array of data that saved to a JSONObject and put it in a JSONArray?

问题

以下是翻译好的部分：

我在我的HTML中有一些字段，比如说有2行字段，我在控制器上对它们进行循环。

我希望结果是这样的：

  1. {
  2.   "specifications": [
  3.     {
  4.       "name": "height",
  5.       "value": "cm"
  6.     },
  7.     {
  8.       "name": "weight",
  9.       "value": "kg"
  10.     }
  11.   ]
  12. }

但是每次我使用下面的代码循环时，我只能得到迭代的最后一行保存到我的JSONArray中：

  1. JSONObject itemTypeObj = new JSONObject();
  2. JSONArray itemTypeArray = new JSONArray();
  3. JSONObject itemTypeSpecs = new JSONObject();
  4. ArrayList<String> values = new ArrayList();
  6. for (int x = 0; x < specName.length; x++) {
  7.     itemTypeSpecs.put("specName", specName[x]);
  9.     if (specValue[x].contains(",")) {
  10.         for (String v : specValue[x].split(",")) {
  11.             values.add(v.trim());
  12.         }
  13.         itemTypeSpecs.put("specValue", values);
  14.     } else {
  15.         itemTypeSpecs.put("specValue", specValue[x]);
  16.     }
  18.     values.clear();
  19.     itemTypeArray.put(itemTypeSpecs);
  20. }
  22. itemTypeObj.put("specifications", itemTypeArray);

结果变成了这样，而不是我上面期望的样子：

  1. {
  2.   "specifications": [
  3.     {
  4.       "name": "Weight",
  5.       "value": "kg"
  6.     },
  7.     {
  8.       "name": "Weight",
  9.       "value": "kg"
  10.     }
  11.   ]
  12. }

我找不到为什么只获取到最后一行的原因。非常感谢您的帮助。谢谢。

英文:

I have fields in my HTML, say for example 2 rows of fields which I loop over on my controller.

I want it to result to something like this:

  1. {
  2. &quot;specifications&quot;:
  3. [
  4.     {
  5.       &quot;name&quot; : &quot;height&quot;,
  6.       &quot;value&quot; : &quot;cm&quot;
  7.     },
  8.     {
  9.       &quot;name&quot; : &quot;weight&quot;,
  10.       &quot;value&quot; : &quot;kg&quot;
  11.     }
  12.   ]
  13. }

But every time I loop using my code below, I only get the last row of the iteration saved to my JSONArray

  1. JSONObject itemTypeObj = new JSONObject();
  2. JSONArray itemTypeArray = new JSONArray();
  3. JSONObject itemTypeSpecs = new JSONObject();
  4. ArrayList&lt;String&gt; values = new ArrayList();
  6.         for(int x = 0; x &lt; specName.length; x++){
  8.             itemTypeSpecs.put(&quot;specName&quot;, specName[x]);
  10.             if (specValue[x].contains(&quot;,&quot;)) {
  12.                 for (String v : specValue[x].split(&quot;,&quot;)) {
  13.                     values.add(v.trim());
  14.                 }
  16.                 itemTypeSpecs.put(&quot;specValue&quot;, values);
  17.             } else {
  18.                 itemTypeSpecs.put(&quot;specValue&quot;, specValue[x]);
  19.             }
  21.             values.clear();
  23.             itemTypeArray.put(itemTypeSpecs);
  25.         }
  27. itemTypeObj.put(&quot;specifications&quot;, itemTypeArray);

Result becomes like this instead of the one I expect from above

  1. {&quot;specifications&quot;:
  2.   [
  3.    {
  4.     &quot;name&quot;:&quot;Weight&quot;,
  5.     &quot;value&quot;:&quot;kg&quot;
  6.    },
  7.    {
  8.     &quot;name&quot;:&quot;Weight&quot;,
  9.     &quot;value&quot;:&quot;kg&quot;
  10.    }
  11.   ]
  12. }

I can't find the reason why it's only getting the last row. Any help is appreciated. Thank you.

答案1

得分: 3

你应该在第一个“for循环”内部创建数组列表（array list）和JSONObject。因为你总是在改变相同的对象。你可以尝试这样做：

  1. JSONObject itemTypeObj = new JSONObject();
  2. JSONArray itemTypeArray = new JSONArray();
  4. for (int x = 0; x < specName.length; x++) {
  5.     List<String> values = new ArrayList();
  6.     JSONObject itemTypeSpecs = new JSONObject();
  7.     itemTypeSpecs.put("specName", specName[x]);
  9.     if (specValue[x].contains(",")) {
  10.         for (String v : specValue[x].split(","))
  11.             values.add(v.trim());
  12.         itemTypeSpecs.put("specValue", values);
  13.     } else {
  14.         itemTypeSpecs.put("specValue", specValue[x]);
  15.     }
  16.     itemTypeArray.put(itemTypeSpecs);
  17. }
  18. itemTypeObj.put("specifications", itemTypeArray);
英文:

You should crate array list and JSONObject inside first "for loop".Because you change always same objects Can yo try this?

  1.         JSONObject itemTypeObj = new JSONObject();
  2.         JSONArray itemTypeArray = new JSONArray();
  3.         
  4.         for (int x = 0; x &lt; specName.length; x++) {
  5.             List&lt;String&gt; values = new ArrayList();
  6.             JSONObject itemTypeSpecs = new JSONObject();
  7.             itemTypeSpecs.put(&quot;specName&quot;, specName[x]);
  8.             
  9.             if (specValue[x].contains(&quot;,&quot;)) {
  10.                 for (String v : specValue[x].split(&quot;,&quot;))
  11.                     values.add(v.trim());
  12.                 itemTypeSpecs.put(&quot;specValue&quot;, values);
  13.             } else {
  14.                 itemTypeSpecs.put(&quot;specValue&quot;, specValue[x]);
  15.             }
  16.             itemTypeArray.put(itemTypeSpecs);
  17.         }
  18.         itemTypeObj.put(&quot;specifications&quot;, itemTypeArray);

huangapple
  • 本文由 发表于 2020年5月29日 18:08:02
  • 转载请务必保留本文链接：https://go.coder-hub.com/62083511.html
  • arrays
  • java
  • json
  • object
  • spring-boot
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