drools xls 错误 无法打开 Excel 流，请检查内容是否为 xls97 格式

如何解决drools xls 错误 无法打开 Excel 流，请检查内容是否为 xls97 格式

我在尝试以下行时遇到以下错误。

VerifierBuilder vBuilder = VerifierBuilderFactory.newVerifierBuilder();
Verifier verifier = vBuilder.newVerifier();
Reader reader = new InputStreamReader(multipartExcel.getInputStream());
DecisionTableConfiguration dtconf = KNowledgeBuilderFactory.newDecisionTableConfiguration();
dtconf.setInputType(DecisionTableInputType.XLS);
verifier.addResourcesToVerify(ResourceFactory.newReaderResource(reader),ResourceType.DTABLE,dtconf);

同样的代码在我的 Windows 电脑上运行良好。但是当我作为 docker 部署到 linux vm 时，我收到了这个错误。我试过两台服务器收到的文件大小一样。

equest processing Failed; nested exception is org.drools.template.parser.DecisionTableParseException: Failed to open Excel stream,please check that the content is xls97 format.] with root cause

java.io.IOException: Your InputStream was neither an OLE2 stream,nor an OOXML stream
        at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:258) ~[poi-4.1.2.jar:4.1.2]
        at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:221) ~[poi-4.1.2.jar:4.1.2]
        at org.drools.decisiontable.parser.xls.ExcelParser.parseFile(ExcelParser.java:101) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.decisiontable.SpreadsheetCompiler.parseResource(SpreadsheetCompiler.java:136) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:120) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:93) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.decisiontable.DecisionTableProviderImpl.compileResource(DecisionTableProviderImpl.java:74) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.decisiontable.DecisionTableProviderImpl.loadFromresource(DecisionTableProviderImpl.java:42) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.compiler.compiler.DecisionTableFactory.loadFromresource(DecisionTableFactory.java:35) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.compiler.builder.impl.KNowledgeBuilderImpl.decisionTabletoPackageDescr(KNowledgeBuilderImpl.java:412) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.compiler.builder.impl.KNowledgeBuilderImpl.addPackageFromDecisionTable(KNowledgeBuilderImpl.java:381) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.compiler.builder.impl.KNowledgeBuilderImpl.addKNowledgeResource(KNowledgeBuilderImpl.java:749) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.verifier.builder.VerifierPackageBuilder.addKNowledgeResource(VerifierPackageBuilder.java:40) ~[drools-verifier-drl-7.46.0.Final.jar:7.46.0.Final]
        at org.drools.verifier.builder.VerifierImpl.addResourcesToVerify(VerifierImpl.java:199) ~[drools-verifier-drl-7.46.0.Final.jar:7.46.0.Final]
        at RuleService.validateRule(RuleService.java:272) ~[rule-1.0.0.jar:na]
        at RuleService.saveRule(RuleService.java:87) ~[rule-1.0.0.jar:na]
        at RuleController.createRule(RuleController.java:70) ~[rule-1.0.0.jar:na]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
        at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]

解决方法

我终于解决了。在这里发帖，好像这对其他人有帮助。

我没有传递 reader，而是将 multipart 保存到一个文件中，并将该文件传递到 ResourceFactory。如下图

verifier.addResourcesToVerify(ResourceFactory.newFileResource(downloadedFile),ruleResourceType,dtconf);