本文将介绍如何从json对象中删除所有null和空字符串值？的详细情况，特别是关于如何从json对象中删除所有null和空字符串值的数据的相关信息。我们将通过案例分析、数据研究等多种方式，帮助您更全面
本文将介绍如何从json对象中删除所有null和空字符串值？的详细情况，特别是关于如何从json对象中删除所有null和空字符串值的数据的相关信息。我们将通过案例分析、数据研究等多种方式，帮助您更全面地了解这个主题，同时也将涉及一些关于android – nullpointerexception试图从json字符串中获取json数组或json对象、android – 如何从这个json对象中提取字符串数组？、c#-4.0 – 如何从JSON字符串中删除转义字符、flash – 如何从显示对象中删除所有事件侦听器？的知识。
本文目录一览：- 如何从json对象中删除所有null和空字符串值？（如何从json对象中删除所有null和空字符串值的数据）
- android – nullpointerexception试图从json字符串中获取json数组或json对象
- android – 如何从这个json对象中提取字符串数组？
- c#-4.0 – 如何从JSON字符串中删除转义字符
- flash – 如何从显示对象中删除所有事件侦听器？
如何从json对象中删除所有null和空字符串值？（如何从json对象中删除所有null和空字符串值的数据）
您能告诉我如何从json对象中删除所有null和空字符串值吗？删除密钥时出现错误。
到目前为止，这是我所拥有的，但是不能正常工作：
$.each(sjonObj, function(key, value) { if(value == "" || value == null) { delete sjonObj.key; }});var sjonObj= { "executionMode": "SEQUENTIAL", "coreTEEVersion": "3.3.1.4_RC8", "testSuiteId": "yyy", "testSuiteFormatVersion": "1.0.0.0", "testStatus": "IDLE", "reportPath": "", "startTime": 0, "durationBetweenTestCases": 20, "endTime": 0, "lastExecutedTestCaseId": 0, "repeatCount": 0, "retryCount": 0, "fixedTimeSyncSupported": false, "totalRepeatCount": 0, "totalRetryCount": 0, "summaryReportRequired": "true", "postConditionExecution": "ON_SUCCESS", "testCaseList": [ { "executionMode": "SEQUENTIAL", "commandList": [ ], "testCaseList": [ ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "a", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" }, { "executionMode": "SEQUENTIAL", "commandList": [ ], "testCaseList": [ { "executionMode": "SEQUENTIAL", "commandList": [ { "commandParameters": { "serverAddress": "www.ggp.com", "echoRequestCount": "", "sendPacketSize": "", "interval": "", "ttl": "", "addFullDataInReport": "True", "maxRTT": "", "failOnTargetHostUnreachable": "True", "failOnTargetHostUnreachableCount": "", "initialDelay": "", "commandTimeout": "", "testDuration": "" }, "commandName": "Ping", "testStatus": "IDLE", "label": "", "reportFileName": "tc_2-tc_1-cmd_1_Ping", "endTime": 0, "startTime": 0, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "postConditionExecution": "ON_SUCCESS", "detailReportRequired": "true", "summaryReportRequired": "true" } ], "testCaseList": [ ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "dd", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" } ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "b", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" } ]};$.each(sjonObj, function(key, value) { if(value == "" || value == null) { delete sjonObj.key; }});console.log(sjonObj);<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>答案1
小编典典您sjonObj.key实际上是要删除。您需要使用数组访问符号：
delete sjonObj[key];但是，这也将删除value等于0的地方，因为您没有使用严格的比较。使用===来代替：
$.each(sjonObj, function(key, value){ if (value === "" || value === null){ delete sjonObj[key]; }});但是，这只会使对象浅走。要深入地做，可以使用递归：
(function filter(obj) { $.each(obj, function(key, value){ if (value === "" || value === null){ delete obj[key]; } else if (Object.prototype.toString.call(value) === ''[object Object]'') { filter(value); } else if ($.isArray(value)) { $.each(value, function (k,v) { filter(v); }); } });})(sjonObj);var sjonObj = { "executionMode": "SEQUENTIAL", "coreTEEVersion": "3.3.1.4_RC8", "testSuiteId": "yyy", "testSuiteFormatVersion": "1.0.0.0", "testStatus": "IDLE", "reportPath": "", "startTime": 0, "durationBetweenTestCases": 20, "endTime": 0, "lastExecutedTestCaseId": 0, "repeatCount": 0, "retryCount": 0, "fixedTimeSyncSupported": false, "totalRepeatCount": 0, "totalRetryCount": 0, "summaryReportRequired": "true", "postConditionExecution": "ON_SUCCESS", "testCaseList": [ { "executionMode": "SEQUENTIAL", "commandList": [ ], "testCaseList": [ ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "a", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" }, { "executionMode": "SEQUENTIAL", "commandList": [ ], "testCaseList": [ { "executionMode": "SEQUENTIAL", "commandList": [ { "commandParameters": { "serverAddress": "www.ggp.com", "echoRequestCount": "", "sendPacketSize": "", "interval": "", "ttl": "", "addFullDataInReport": "True", "maxRTT": "", "failOnTargetHostUnreachable": "True", "failOnTargetHostUnreachableCount": "", "initialDelay": "", "commandTimeout": "", "testDuration": "" }, "commandName": "Ping", "testStatus": "IDLE", "label": "", "reportFileName": "tc_2-tc_1-cmd_1_Ping", "endTime": 0, "startTime": 0, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "postConditionExecution": "ON_SUCCESS", "detailReportRequired": "true", "summaryReportRequired": "true" } ], "testCaseList": [ ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "dd", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" } ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "b", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" } ]};(function filter(obj) { $.each(obj, function(key, value){ if (value === "" || value === null){ delete obj[key]; } else if (Object.prototype.toString.call(value) === ''[object Object]'') { filter(value); } else if (Array.isArray(value)) { value.forEach(function (el) { filter(el); }); } });})(sjonObj);console.log(sjonObj)<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>请注意，如果您愿意使用lodash /
underscore.js之类的库，则可以_.pick改用。但是，由于两个库都没有提供深层过滤功能，因此您仍然需要使用递归进行深层过滤。
sjonObj = (function filter(obj) { var filtered = _.pick(obj, function (v) { return v !== '''' && v !== null; }); return _.cloneDeep(filtered, function (v) { return v !== filtered && _.isPlainObject(v) ? filter(v) : undefined; });})(sjonObj);此变体具有保留原始对象不变的附加优点，但是它确实创建了一个全新的副本，如果您不需要原始对象，效率将会降低。
var sjonObj = { "executionMode": "SEQUENTIAL", "coreTEEVersion": "3.3.1.4_RC8", "testSuiteId": "yyy", "testSuiteFormatVersion": "1.0.0.0", "testStatus": "IDLE", "reportPath": "", "startTime": 0, "durationBetweenTestCases": 20, "endTime": 0, "lastExecutedTestCaseId": 0, "repeatCount": 0, "retryCount": 0, "fixedTimeSyncSupported": false, "totalRepeatCount": 0, "totalRetryCount": 0, "summaryReportRequired": "true", "postConditionExecution": "ON_SUCCESS", "testCaseList": [ { "executionMode": "SEQUENTIAL", "commandList": [ ], "testCaseList": [ ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "a", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" }, { "executionMode": "SEQUENTIAL", "commandList": [ ], "testCaseList": [ { "executionMode": "SEQUENTIAL", "commandList": [ { "commandParameters": { "serverAddress": "www.ggp.com", "echoRequestCount": "", "sendPacketSize": "", "interval": "", "ttl": "", "addFullDataInReport": "True", "maxRTT": "", "failOnTargetHostUnreachable": "True", "failOnTargetHostUnreachableCount": "", "initialDelay": "", "commandTimeout": "", "testDuration": "" }, "commandName": "Ping", "testStatus": "IDLE", "label": "", "reportFileName": "tc_2-tc_1-cmd_1_Ping", "endTime": 0, "startTime": 0, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "postConditionExecution": "ON_SUCCESS", "detailReportRequired": "true", "summaryReportRequired": "true" } ], "testCaseList": [ ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "dd", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" } ], "testStatus": "IDLE", "boundTimeDurationForExecution": 0, "startTime": 0, "endTime": 0, "label": null, "repeatCount": 0, "retryCount": 0, "totalRepeatCount": 0, "totalRetryCount": 0, "testCaseId": "b", "summaryReportRequired": "false", "postConditionExecution": "ON_SUCCESS" } ]};sjonObj = (function filter(obj) { var filtered = _.pick(obj, function (v) { return v !== '''' && v !== null; }); return _.cloneDeep(filtered, function (v) { return v !== filtered && _.isPlainObject(v) ? filter(v) : undefined; });})(sjonObj);console.log(sjonObj);<script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.js"></script>
android – nullpointerexception试图从json字符串中获取json数组或json对象
参见英文答案 >
Android problems with parsing json 2个
你好,当我试图从我的jsonString获取一个对象时,我继续得到NPE.我尝试了很多东西甚至改变了我的json一次,但它只是没有用. HTTPResponse工作正常,当我记录“myObject”时,它给出了正确的对象.但是当我试图让对象进入它时,它给了我一个NPE.我测试了json,它是有效的.我也尝试检索一个数组而不是一个对象,但它也提供了一个NPE.有人能告诉我如何解决这个问题.
你好,当我试图从我的jsonString获取一个对象时,我继续得到NPE.我尝试了很多东西甚至改变了我的json一次,但它只是没有用. HTTPResponse工作正常,当我记录“myObject”时,它给出了正确的对象.但是当我试图让对象进入它时,它给了我一个NPE.我测试了json,它是有效的.我也尝试检索一个数组而不是一个对象,但它也提供了一个NPE.有人能告诉我如何解决这个问题.
我做了一个简单的jsontester活动来测试我的json：
public class JSONTester extends Activity {
private DefaultHttpClient createHttpClient() {
HttpParams my_httpParams = new BasicHttpParams();
httpconnectionParams.setConnectionTimeout(my_httpParams,3000);
SchemeRegistry registry = new SchemeRegistry();
registry.register(new Scheme("http",PlainSocketFactory.getSocketFactory(),80));
ThreadSafeClientConnManager multiThreadedConnectionManager = new ThreadSafeClientConnManager(my_httpParams,registry);
DefaultHttpClient httpclient = new DefaultHttpClient(multiThreadedConnectionManager,my_httpParams);
return httpclient;
}
MikeyJSON mJSON;
Button mBtnGo;
TextView mTxt1;
TextView mTxt2;
TextView mTxt3;
TextView mTxt4;
ProgressDialog mProgressDialog;
private String lang;
private int length; // 0 - 6 (length 7 to length 12)
private int wordPos; // 0 - array length
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jsontester);
mTxt1 = (TextView) findViewById(R.id.txt1);
mTxt1 = (TextView) findViewById(R.id.txt1);
mTxt1 = (TextView) findViewById(R.id.txt1);
mTxt1 = (TextView) findViewById(R.id.txt1);
mBtnGo = (Button) findViewById(R.id.btnGo);
}
public boolean isNumeric(String str) {
for(int i=0;i<str.length();i++) {
if(Character.isDigit(str.charat(i))) {
return true;
}
}
return false;
}
public void testJSON(View view) {
if(view==mBtnGo) {
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("loading");
mProgressDialog.show();
new DownloadNewWords().execute();
}
}
private class DownloadNewWords extends AsyncTask<Void,Void,Void> {
int mStatusCode = 0;
String mResultString;
Exception mConnectionException;
@Override
protected Void doInBackground(Void... args) {
String fetchUrl = "http://www.mikeywebs.nl/json/jsonexample.html";
DefaultHttpClient httpclient = createHttpClient();
HttpGet httpget = new HttpGet(fetchUrl);
try {
HttpResponse response = httpclient.execute(httpget);
StatusLine statusLine = response.getStatusLine();
mStatusCode = statusLine.getStatusCode();
if (mStatusCode == 200){
mResultString = EntityUtils.toString(response.getEntity());
}
} catch (ClientProtocolException e) {
e.printstacktrace();
mConnectionException = e;
} catch (IOException e) {
e.printstacktrace();
mConnectionException = e;
}
return null;
}
@Override
protected void onPostExecute(Void arg) {
mProgressDialog.dismiss();
if (mStatusCode == 200){
mJSON = new MikeyJSON(mResultString);
lang = "English"; //Integer.parseInt(langu);
length = 7; //Integer.parseInt(wordl);
wordPos = 0;
String getWord = mJSON.getResult(lang,length,wordPos);
mTxt4.setText(getWord);
}
else {
Toast.makeText(JSONTester.this,"Gegevens konden niet worden opgehaald. Controleer uw internetverbinding en probeer het opnieuw (" +mConnectionException.toString() + ")",Toast.LENGTH_LONG).show();
mJSON = null;
}
}
}
}
我使用的jsonclass是：
public class MikeyJSON {
private JSONObject myObject;
private JSONArray jsonArray;
int i;
public MikeyJSON(String jsonString) {
Log.i("JSON","jsonString: " + jsonString);
try {
JSONObject myObject = new JSONObject(jsonString);
Log.i("JSON","myObject_Object: " + myObject.toString());
} catch (JSONException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
}
public String getResult(String lang,int length,int wordPos) {
String word = "0";
//0 is Nederlands 1 is English
int la = 0;
if(lang.equals("English")) {
la = 1;
}
//make String length
String le = "length" + Integer.toString(length);
Log.i("PARSE","get_length: " + le);
//the json
try {
jsonArray = myObject.getJSONArray("galgjejson");
Log.i("JSON","jsonArray: " + jsonArray.toString());
} catch (JSONException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
return word;
}
}
这是json：
{ "galgjejson" : [
{ "Nederlands" : [
{ "length7" : [
{ "word" : "android" },{ "word" : "camping" },{ "word" : "koekjes" }
]
}
]
},{ "English" : [
{ "length7" : [
{ "word" : "android" },{ "word" : "koekjes" }
]
}
]
}
]
}
这是日志：
03-18 14:06:23.178: I/JSON(6719): myObject_Object: {"Nederlands":[{"length7":
[{"word":"android"},{"word":"camping"},{"word":"koekjes"}]}]}
03-18 14:06:23.178: I/PARSE(6719): get_length: length7
03-18 14:06:23.178: D/AndroidRuntime(6719): Shutting down VM
03-18 14:06:23.178: W/dalvikvm(6719): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
03-18 14:06:23.207: E/AndroidRuntime(6719): FATAL EXCEPTION: main
03-18 14:06:23.207: E/AndroidRuntime(6719): java.lang.NullPointerException
03-18 14:06:23.207: E/AndroidRuntime(6719): at me.mikey.my.games.galgjex.MikeyJSON.<init>(MikeyJSON.java:38)
03-18 14:06:23.207: E/AndroidRuntime(6719): at me.mikey.my.games.galgjex.JSONTester$DownloadNewWords.onPostExecute(JSONTester.java:128)
03-18 14:06:23.207: E/AndroidRuntime(6719): at me.mikey.my.games.galgjex.JSONTester$DownloadNewWords.onPostExecute(JSONTester.java:1)
03-18 14:06:23.207: E/AndroidRuntime(6719): at android.os.AsyncTask.finish(AsyncTask.java:631)
03-18 14:06:23.207: E/AndroidRuntime(6719): at android.os.AsyncTask.access$600(AsyncTask.java:177)
03-18 14:06:23.207: E/AndroidRuntime(6719): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
03-18 14:06:23.207: E/AndroidRuntime(6719): at android.os.Handler.dispatchMessage(Handler.java:99)
03-18 14:06:23.207: E/AndroidRuntime(6719): at android.os.Looper.loop(Looper.java:137)
03-18 14:06:23.207: E/AndroidRuntime(6719): at android.app.ActivityThread.main(ActivityThread.java:4745)
03-18 14:06:23.207: E/AndroidRuntime(6719): at java.lang.reflect.Method.invokeNative(Native Method)
03-18 14:06:23.207: E/AndroidRuntime(6719): at java.lang.reflect.Method.invoke(Method.java:511)
03-18 14:06:23.207: E/AndroidRuntime(6719): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-18 14:06:23.207: E/AndroidRuntime(6719): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-18 14:06:23.207: E/AndroidRuntime(6719): at dalvik.system.NativeStart.main(Native Method)
哦,第38行是：
jsonArray = myObject.getJSONArray("galgjejson");
解决方法
myObject很可能是null,因为你在类中拥有它,然后在mikeyJSON中私有.你应该尝试：
private JSONObject myObject;
private JSONArray jsonArray;
int i;
public MikeyJSON(String jsonString) {
Log.i("JSON","jsonString: " + jsonString);
try {
myObject = new JSONObject(jsonString);
Log.i("JSON","myObject_Object: " + myObject.toString());
} catch (JSONException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
}
看看那个JSON我很确定你可以使用构造函数中的字符串而不是JSONObject来创建JSONArray.
编辑的例子.
private JSONArray jsonArray;
int i;
public MikeyJSON(String jsonString) {
try {
jsonArray = new JSONArray(jsonString);
} catch (JSONException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
}
android – 如何从这个json对象中提取字符串数组？
我正在尝试使用org.json中的类从以下json对象获取可用数字列表
{
"response":true,
"state":1,
"data":
{
"CALLERID":"81101099",
"numbers":
[
"21344111","21772917",
"28511113","29274472",
"29843999","29845591",
"30870001","30870089",
"30870090","30870091"
]
}
}
在从Web服务接收到json对象后,我的第一步是：
jsonObj = new JSONObject(response);
jsonData = jsonObj.optJSONObject("data");
现在,如何保存数字的字符串数组？
解决方法:
采用：
jsonObj = new JSONObject(response);
jsonData = jsonObj.optJSONObject("data");
JSONArray arrjson = jsonData.getJSONArray("numbers");
String[] arr = new String[arrjson.length()];
for(int i = 0; i < arrjson.length(); i++)
arr[i] = arrjson.getString(i);
c#-4.0 – 如何从JSON字符串中删除转义字符
我调用了一个REST API,返回了以下
JSON字符串：
"{\"profile\":[{\"name\":\"city\",\"rowCount\":1,\"location\": ............
在我反序列化之前,我尝试使用以下代码删除转义字符：
jsonString = jsonString.Replace(@"\"," ");
但是当我反序列化它时,它会抛出输入字符串不是正确的格式：
SearchRootObject obj = JsonConvert.DeserializeObject<SearchRootObject>(jsonString);
以下是完整的代码：
public static SearchRootObject obj()
{
String url = Glare.searchUrl;
string jsonString = "";
// Create the web request
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
// Get response
var response = request.GetResponse();
Stream receiveStream = response.GetResponseStream();
// Pipes the stream to a higher level stream reader with the required encoding format.
StreamReader readStream = new StreamReader(receiveStream,Encoding.UTF8);
jsonString = jsonString + readStream.ReadToEnd();
jsonString = jsonString.Replace(@"\"," ");
// A C# object representation of deserialized JSON string
SearchRootObject obj = JsonConvert.DeserializeObject<SearchRootObject>(jsonString);
return obj;
}
解决方法
切换到使用JavaScriptSerializer()反序列化JSON字符串后,我意识到我的对象中有一个int类型属性,用于JSON字符串中的十进制值.我将int改为double,这解决了我的问题. JsonConvert.DeserializeObject<>和JavaScriptSerializer()处理转义字符.没有必要删除转义字符.
我替换了以下代码：
我替换了以下代码：
jsonString = jsonString.Replace(@"\"," "); SearchRootObject obj = JsonConvert.DeserializeObject<SearchRootObject>(jsonString); return obj;
附：
return new JavaScriptSerializer().Deserialize<SearchObj.RootObject>(jsonString);
flash – 如何从显示对象中删除所有事件侦听器？
有没有办法确定哪些事件侦听器在显示对象上注册？我想从显示对象中删除所有事件监听器,以便我可以根据应用程序中的上下文更改分配新的事件侦听器.
解决方法
jeceuyper是对的…
一边不是：displayObject扩展了Eventdispatcher,它已经实现了IEventdispatcher …所以要更精确：你需要重写addEventListener和removeEventListener来跟踪监听器…
一些技术细节：我建议你使用Dictionary来存储处理函数…有点慢的插入,但更快的删除…还有,Dictionary支持弱引用,这在事件处理的情况下是非常重要的.还要记住,useCapture允许添加相同的处理程序两次…
那么祝你好运吧 …
总结
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