blocks|key|306858|text|奇怪的是，答案是不断添加回来的属性。我还以为会有一个setter方法。:S|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|306859|System.out.println("Before:+"+%2B+obj.get("DebugLogId"));+//+original+"02352"

obj.addProperty("DebugLogId",+"YYY");

System.out.println("After:+"+%2B+obj.get("DebugLogId"));+//+now+"YYY"|code-block|syntax|javascript|306860|entityMap^0|Q|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Strangely, the answer is to keep adding back the property. I was half expecting a <code>setter</code> method. :S

<pre><code>System.out.println("Before: " + obj.get("DebugLogId")); // original "02352"

obj.addProperty("DebugLogId", "YYY");

System.out.println("After: " + obj.get("DebugLogId")); // now "YYY"
</code></pre>

blocks|key|523816|text|这适用于使用JSONObject修改子键值。导入使用的是|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|523817|import+org.json.JSONObject;|code-block|syntax|javascript|523818|ex+json：(将json文件转换为字符串，同时作为输入)|523819|{
++++"parentkey1":+"name",
++++"parentkey2":+{
+++++"childkey":+"test"
++++},
}|523820|代码|523821|JSONObject+jObject++=+new+JSONObject(String+jsoninputfileasstring);
jObject.getJSONObject("parentkey2").put("childkey","data1");
System.out.println(jObject);|523822|输出：|523823|{
++++"parentkey1":+"name",
++++"parentkey2":+{
+++++"childkey":+"data1"
++++},
}|523824|entityMap^0|6|A|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|16|8|@]|D|@]|E|$]]|$1|U|3|V|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|W|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|X|$]]

This works for modifying childkey value using <code>JSONObject</code>.
import used is

<pre><code>import org.json.JSONObject;
</code></pre>

ex json:(convert json file to string while giving as input)

<pre><code>{
 "parentkey1": "name",
 "parentkey2": {
 "childkey": "test"
 },
}
</code></pre>

Code

<pre><code>JSONObject jObject = new JSONObject(String jsoninputfileasstring);
jObject.getJSONObject("parentkey2").put("childkey","data1");
System.out.println(jObject);
</code></pre>

output:

<pre><code>{
 "parentkey1": "name",
 "parentkey2": {
 "childkey": "data1"
 },
}
</code></pre>

blocks|key|307012|text|从2.3版Gson库开始，JsonArray类就有了一个“set”方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|307013|下面是一个简单的例子：|307014|JsonArray+array+=+new+JsonArray();
array.add(new+JsonPrimitive("Red"));
array.add(new+JsonPrimitive("Green"));
array.add(new+JsonPrimitive("Blue"));

array.remove(2);
array.set(0,+new+JsonPrimitive("Yelow"));|code-block|syntax|javascript|307015|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Since 2.3 version of Gson library the JsonArray class have a 'set' method.

Here's an simple example:

<pre><code>JsonArray array = new JsonArray();
array.add(new JsonPrimitive("Red"));
array.add(new JsonPrimitive("Green"));
array.add(new JsonPrimitive("Blue"));

array.remove(2);
array.set(0, new JsonPrimitive("Yelow"));
</code></pre>

blocks|key|306943|text|另一种方法是反序列化为java.util.Map，然后根据需要修改Map。这将Java端数据处理从数据传输机制(+JSON+)中分离出来，这是我更喜欢的代码组织方式:使用JSON进行数据传输，而不是作为替代数据结构。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|306944|entityMap^0|B|D|X|3|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Another approach would be to deserialize into a <code>java.util.Map</code>, and then just modify the Java <code>Map</code> as wanted. This separates the Java-side data handling from the data transport mechanism (JSON), which is how I prefer to organize my code: using JSON for data transport, not as a replacement data structure.

blocks|key|523732|text|实际上，这些都在文档中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|523733|JSONObject和JSONArray都可以用来替代标准数据结构。|523734|要实现设置器，只需在put(String+name,+Object+value)之前调用remove(String+name)。|offset|length|style|CODE|523735|下面是一个简单的例子：|523736|public+class+BasicDB+{

private+JSONObject+jData+=+new+JSONObject;

public+BasicDB(String+username,+String+tagline)+{
++++try+{
++++++++jData.put("username",+username);
++++++++jData.put("tagline"+,+tagline);
++++}+catch+(JSONException+e)+{
++++++++//+TODO+Auto-generated+catch+block
++++++++e.printStackTrace();
++++}
}

public+String+getUsername+()+{+
++++String+ret+=+null;
++++try+{
++++++++ret+=+jData.getString("username");
++++}+catch+(JSONException+e)+{
++++//+TODO+Auto-generated+catch+block
++++e.printStackTrace();
++++}+
++++return+ret;
}

public+void+setUsername+(String+username)+{+
++++try+{
++++++++jData.remove("username");
++++++++jData.put("username"+,+username);
++++}+catch+(JSONException+e)+{
++++++++//+TODO+Auto-generated+catch+block
++++++++e.printStackTrace();
++++}
}

public+String+getTagline+()+{
++++String+ret+=+null;
++++try+{
++++++++ret+=+jData.getString("tagline");
++++}+catch+(JSONException+e)+{
++++//+TODO+Auto-generated+catch+block
++++e.printStackTrace();
++++}+
++++return+ret;
}|code-block|syntax|javascript|523737|entityMap^0|0|0|A|U|18|J|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@$F|V|G|W|H|I]|$F|X|G|Y|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|10|8|@]|9|@]|A|$O|P]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

It's actually all in the documentation. 
JSONObject and JSONArray can both be used to replace the standard data structure. 
To implement a setter simply call a <code>remove(String name)</code> before a <code>put(String name, Object value)</code>.

Here's an simple example:

<pre><code>public class BasicDB {

private JSONObject jData = new JSONObject;

public BasicDB(String username, String tagline) {
 try {
 jData.put("username", username);
 jData.put("tagline" , tagline);
 } catch (JSONException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
}

public String getUsername () { 
 String ret = null;
 try {
 ret = jData.getString("username");
 } catch (JSONException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 } 
 return ret;
}

public void setUsername (String username) { 
 try {
 jData.remove("username");
 jData.put("username" , username);
 } catch (JSONException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
}

public String getTagline () {
 String ret = null;
 try {
 ret = jData.getString("tagline");
 } catch (JSONException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 } 
 return ret;
}
</code></pre>

blocks|key|523846|text|public+static+JSONObject+convertFileToJSON(String+fileName,+String+username,+List<String>+list)
++++++++++++throws+FileNotFoundException,+IOException,+org.json.simple.parser.ParseException+{
++++++++JSONObject+json+=+new+JSONObject();
++++++++String+jsonStr+=+new+String(Files.readAllBytes(Paths.get(fileName)));
++++++++json+=+new+JSONObject(jsonStr);
++++++++System.out.println(json);
++++++++JSONArray+jsonArray+=+json.getJSONArray("users");
++++++++JSONArray+finalJsonArray+=+new+JSONArray();
++++++++/**
+++++++++*+Get+User+form+setNewUser+method
+++++++++*/
++++++++//finalJsonArray.put(setNewUserPreference());
++++++++boolean+has+=+true;
++++++++for+(int+i+=+0;+i+<+jsonArray.length();+i%2B%2B)+{
++++++++++++JSONObject+jsonObject+=+jsonArray.getJSONObject(i);
++++++++++++finalJsonArray.put(jsonObject);
++++++++++++String+username2+=+jsonObject.getString("userName");
++++++++++++if+(username2.equals(username))+{
++++++++++++++++has+=+true;
++++++++++++}
++++++++++++System.out.println("user+name++are+:"+%2B+username2);
++++++++++++JSONObject+jsonObject2+=+jsonObject.getJSONObject("languages");
++++++++++++String+eng+=+jsonObject2.getString("Eng");
++++++++++++String+fin+=+jsonObject2.getString("Fin");
++++++++++++String+ger+=+jsonObject2.getString("Ger");
++++++++++++jsonObject2.put("Eng",+"ChangeEnglishValueCheckForLongValue");
++++++++++++System.out.println("+Eng+:+"+%2B+eng+%2B+"++Fin+"+%2B+fin+%2B+"++ger+:+"+%2B+ger);
++++++++}
++++++++System.out.println("Final+JSON+Array+\n"+%2B+json);
++++++++jsonArray.put(setNewUserPreference());
++++++++return+json;
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|523847|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public static JSONObject convertFileToJSON(String fileName, String username, List&lt;String&gt; list)
 throws FileNotFoundException, IOException, org.json.simple.parser.ParseException {
 JSONObject json = new JSONObject();
 String jsonStr = new String(Files.readAllBytes(Paths.get(fileName)));
 json = new JSONObject(jsonStr);
 System.out.println(json);
 JSONArray jsonArray = json.getJSONArray("users");
 JSONArray finalJsonArray = new JSONArray();
 /**
 * Get User form setNewUser method
 */
 //finalJsonArray.put(setNewUserPreference());
 boolean has = true;
 for (int i = 0; i &lt; jsonArray.length(); i++) {
 JSONObject jsonObject = jsonArray.getJSONObject(i);
 finalJsonArray.put(jsonObject);
 String username2 = jsonObject.getString("userName");
 if (username2.equals(username)) {
 has = true;
 }
 System.out.println("user name are :" + username2);
 JSONObject jsonObject2 = jsonObject.getJSONObject("languages");
 String eng = jsonObject2.getString("Eng");
 String fin = jsonObject2.getString("Fin");
 String ger = jsonObject2.getString("Ger");
 jsonObject2.put("Eng", "ChangeEnglishValueCheckForLongValue");
 System.out.println(" Eng : " + eng + " Fin " + fin + " ger : " + ger);
 }
 System.out.println("Final JSON Array \n" + json);
 jsonArray.put(setNewUserPreference());
 return json;
 }
</code></pre>

Once i have parsed a JSON String into a GSON provided JsonObject class, (assume that i do not wish to parse it into any meaningful data objects, but strictly want to use JsonObject), how am i able to modify a field / value of a key directly?

I don't see an API that may help me. 

<a href="https://static.javadoc.io/com.google.code.gson/gson/2.6.2/com/google/gson/JsonObject.html" rel="noreferrer">https://static.javadoc.io/com.google.code.gson/gson/2.6.2/com/google/gson/JsonObject.html</a>

How to modify values of JsonObject / JsonArray directly?

数据结构

JSON

Java

一旦我将一个JSON字符串解析成GSON提供的JsonObject类(假设我不想将它解析成任何有意义的数据对象，但严格地说我想使用JsonObject)，我如何能够直接修改一个键的字段/值呢？我看不到能帮到我的API。

问如何直接修改JsonObject / JsonArray的值？
EN

回答 6

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问如何直接修改JsonObject / JsonArray的值？EN

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问如何直接修改JsonObject / JsonArray的值？
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