嗨，
我实际上正在开发一个应用程序，该应用程序可以读取文件中的字段并将其使用spring，J2EE，Hibernate和Mysql记录到数据库中，但是在尝试将检索到的字段（对象）发送到服务时遇到了问题我收到java.lang.NullPointerException错误。
这是文件阅读器代码：
import Infradashboard.Infradashboard.Entities.Call;
import Infradashboard.Infradashboard.Services.CallService;
import org.springframework.beans.factory.annotation.Autowired;
import java.io.BufferedReader;
import java.io.FileReader;
public class FileOperationCdr {
@Autowired
CallService callService;
public void loadCdrValues() throws Exception {
//Read CDR File
BufferedReader in = new BufferedReader(new FileReader(
"/home/rida/IdeaProjects/CDR_SM/S000A4B-D40E-180805-05_47"));
//Buffer to store file contents
StringBuffer fileContentBuffer = new StringBuffer();
String str;
while ((str = in.readLine()) != null) {
//If empty line, replace it with comma in buffer
if (str.equals("")) {
fileContentBuffer.append(",");
}
//Add line to file buffer
fileContentBuffer.append(str);
}
//Split file contents with comma delimiter and store in an array
//This provides each CDR record as array element
String[] contentArray = fileContentBuffer.toString().split(",");
//Main object to be stored in db
//This will contain start, stop and interim-update details
//Iterate through CDR content
for (int i = 0; i < contentArray.length; i++) {
if (contentArray[i].length() > 0) {
//Split the content array with "TAB" delimiter to get all values of the data
String[] innerArray = contentArray[i].split("\t");
//Local object to store data values
Call innerObject = new Call();
String timedayminutes = (innerArray[0].substring(innerArray[0].lastIndexOf(":") + 1));
String datemounth = (innerArray[0].split("/")[0]).toString();
String dateday = (innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1));
String durationhours = (((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(6,7));
String durationminutes = (((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(7,9));
String durationsecondes = (((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(9,11));
String durationmilliseconds = (((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(11,14));
String conditioncode = (((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(14,15));
String dialednumber = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(16))).split(" ")[0];
String callingnumber = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(32))).split(" ")[0];
String destinationsip = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(48))).split(" ")[0];
String orginatingsip = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(81))).split(" ")[0];
String feautureflag = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(114))).split(" ")[0];
String BCC = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(116,117)));
String MAUUI = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(117,118)));
String resourceflag = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(118,119)));
String bandwidth = (((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(120,122)))).replaceAll("\\D+","");
String avgsid = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(123))).split(" ")[0];
String callingipadresse = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(160,174))).split(" ")[0];
String calledipadresse = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(176,190)));
String voicecall = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(192,193)));
String videocall = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(193,194)));
String faxcall = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(194,195)));
String textcall = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(195,196)));
String othercall = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(196,197)));
String codec = ((((innerArray[0].substring(innerArray[0].lastIndexOf("/") + 1))).substring(198,200))).replaceAll("\\D+","");
String callingpartyid = "No";
String calledpartyid = "No";
String carriagereturn = "NO";
innerObject.setTimeofdayhours(Integer.parseInt((innerArray[0].split(":")[0]).toString()));
innerObject.setTimeofdayminutes(Integer.parseInt((timedayminutes.split(" ")[0]).toString()));
innerObject.setDateofyearmounth(Integer.parseInt((datemounth.substring(datemounth.lastIndexOf(" ") + 1)).toString()));
innerObject.setDateofyearday(Integer.parseInt((dateday.substring(0, 2)).toString()));
innerObject.setDurationhours(Integer.parseInt(durationhours.toString()));
innerObject.setDurationminutes(Integer.parseInt(durationminutes.toString()));
innerObject.setDurationseconds(Integer.parseInt(durationsecondes.toString()));
innerObject.setDurationmilliseconds(Integer.parseInt(durationmilliseconds.toString()));
innerObject.setConditioncode(conditioncode.toString());
innerObject.setDialednumber(dialednumber.toString());
innerObject.setCallingnumber(callingnumber.toString());
innerObject.setTerminatingSIPEntity(destinationsip.toString());
innerObject.setOriginatingSIPEntity(orginatingsip.toString());
innerObject.setFeatureflag(feautureflag.toString());
innerObject.setBCC(BCC.toString());
innerObject.setMAUUI(MAUUI.toString());
innerObject.setResourceflag(resourceflag.toString());
innerObject.setBandwidth(Integer.parseInt(bandwidth.toString()));
innerObject.setAvGSID(avgsid.toString());
innerObject.setCallingPartyIP(callingipadresse.toString());
innerObject.setCalledPartyIP(calledipadresse.toString());
innerObject.setCallusagevoice(voicecall.toString());
innerObject.setCallusagevideo(videocall.toString());
innerObject.setCallusagefax(faxcall.toString());
innerObject.setCallusagetext(textcall.toString());
innerObject.setCallusageother(othercall.toString());
if (codec.equals(""))
{
innerObject.setCodec(Integer.parseInt("0"));
}
else
{
innerObject.setCodec(Integer.parseInt(codec.toString()));
}
innerObject.setCallingpartyid(callingpartyid.toString());
innerObject.setCalledpartyid(calledpartyid.toString());
innerObject.setCarriagereturn(carriagereturn.toString());
callService.createCall(innerObject);
}
}
}
服务：
import Infradashboard.Infradashboard.Entities.Call;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public interface CallService {
List<Call> getAllCalls();
Call getCallById(Integer callId);
Call createCall(Call call);
Call updateCall(Integer callId, Call callDetails);
}
服务实现：
import Infradashboard.Infradashboard.Entities.Call;
import Infradashboard.Infradashboard.Repository.CallRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class CallServiceImp implements CallService {
@Autowired
CallRepository callRepository;
@Override
public List<Call> getAllCalls() {
return callRepository.findAll();
}
@Override
public Call getCallById(Integer callId) {
return callRepository.findById(callId)
.orElseThrow(() -> new ResourceNotFoundException( "Call" , "Id" , callId));
}
@Override
public Call createCall(Call call) {
return callRepository.save(call);
}
@Override
public Call updateCall(Integer callId, Call callDetails) {
}
}
文件内容：
05:41 08/05
054100000000N 0275600000 0505455134 ACM SBCE 4 M00 1 75f9e080-9861-11e8-abe2-0050569600f2 10.0.0.5 0.0.0.0 YNNNN
生成的错误：
java.lang.NullPointerException
at Infradashboard.Infradashboard.DAO.FileOperationCdr.loadCdrValues(FileOperationCdr.java:124)
at Infradashboard.Infradashboard.InfradashboardApplication.main(InfradashboardApplication.java:17)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
如果我不使用callservice.createcall（innerobject）;代码可以正常工作； 有没有另一种方法可以在不使用新的call（），initializer的情况下创建调用innerobject？