net.sf.json.JSONException: JSONObject [ "data"] is not a JSONArray wrong solution

tags: java

error：JSONObject[“data”] is not a JSONArray
JSONObject [ "data"] is not a JSONArray
the reason：
JSONObject json = AcceptUtil.acceptFile(req);
JSONArray data = json.getJSONArray(“data”);
data acquired JSONObject start in the front end, where the reacquisition JSONObject data array, there will be a problem, if the data value is not above error will be reported.
Solution：
used if (0! = Json.get ( "data"). ToString (). Length ()) for determining, when the length of the data array is not zero, data acquisition go array

if(0!=json.get("data").toString().length()){
	JSONArray data = json.getJSONArray("data");
}

Thinking：
json first print data in the console:
json:{“data”:" “,“type”:1}
found that there is no data value, whether wanted to determine what, when there are data values, data acquired in the data again. Does that mean there is no value data to empty it, go to determine whether the data is null, then the test found that there was still the same problem. Suddenly, this time seems to be a stick awakens, null and "" is not the same, then just think of the above solution, the first json.get ( "data") converted to a string type, and then get the length, is not 0 is determined.

supplement：
before experiencing a similar problem:
net.sf.json.JSONException: JSONObject [ "name"] not found
before a solution to this problem a few days to write, inThis blogDetailed there.

Error Messages：
net.sf.json.JSONException: JSONObject[“data”] is not a JSONArray.
at net.sf.json.JSONObject.getJSONArray(JSONObject.java:1306)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at filter.EncodeFilter.doFilter(EncodeFilter.java:37)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)
at org.apache.coyote.AbstractProtocol $AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.AprEndpoint$ SocketProcessor.doRun(AprEndpoint.java:2536)
at org.apache.tomcat.util.net.AprEndpoint $SocketProcessor.run(AprEndpoint.java:2525) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$ Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:744)

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