在我的Java代码中,我尝试将.csv
文件读入.arff
文件,我正在使用CSVLoader
来实现此目的。以下是我的代码:
package processingPackage;
import java.io.File;
import java.io.IOException;
import weka.core.Instances;
import weka.core.converters.CSVLoader;
public class GenerateArffDetails {
/*filePath in the following line*/
/*"/Users/SubrataMohanty/Desktop/customer_loan_details.csv"*/
public String getTrainFilePath (String filePath) throws IOException {
System.out.println(filePath);
CSVLoader loader = new CSVLoader();
loader.setSource(new File(filePath));
System.out.println(filePath);
Instances dataStructure = loader.getStructure();
Instances data = loader.getDataSet();
weka.core.converters.ArffSaver saver = new weka.core.converters.ArffSaver();
saver.setInstances(data);
saver.setFile(new File("/Users/SubrataMohanty/Desktop/customer_loan_details.arff"));
saver.writeBatch();
String path = "/Users/SubrataMohanty/Desktop/customer_loan_details.arff";
return (path);
}
}
执行上述代码后,我不断收到以下错误跟踪。
java.io.IOException: No source has been specified
at weka.core.converters.CSVLoader.getStructure(CSVLoader.java:962)
at processingPackage.GenerateArffDetails.getTrainFilePath(GenerateArffDetails.java:19)
at processingPackage.LoanClassifier.classifyLoanApplicant(LoanClassifier.java:23)
at processingPackage.Driver.classifyApplicants(Driver.java:15)
at processingPackage.RunClassifier.doGet(RunClassifier.java:38)
at processingPackage.RunClassifier.doPost(RunClassifier.java:48)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
我以下面的String变量格式传递filePath变量:
"/Users/SubrataMohanty/Desktop/customer_loan_details.csv"
在对CSVLoader
类进行进一步阅读后,我偶然发现了m_sourceReader变量,该变量初始化如下:
m_sourceReader = new BufferedReader(new InputStreamReader(input));
并返回上面的异常,如果它有 null ,我不明白,因为我显然正在传递filePath
这是正确的。那么我的错误是什么?
我可以知道如何解决这个问题吗?
注意:我正在为我的项目开发MacOSX Sierra。