jasper無法從位置加載對象

我想從jasper文件路徑中獲取JasperReport。我的碧玉文件路徑是C:/project/report/reportTemplate_20110420000035982.jasperjasper無法從位置加載對象

public static JasperReport getJasperReportByTemplateName(String templateFullName) throws JRException{ 
    JasperReport jasperReport; 
    jasperReport = (JasperReport)JRLoader.loadObjectFromLocation(templateFullName); 
    return jasperReport; 
}

，並在此線上發生了異常：

jasperReport = (JasperReport)JRLoader.loadObjectFromLocation(templateFullName);

我試圖找到原因，但是看起來一切正常。我想可能是路徑不是在Windows有效（C:/project/report/reportTemplate_20110420000035982.jasper）

任何人都可以幫助我，非常感謝。我已經粘貼了下面的例外信息。謝謝。


net.sf.jasperreports.engine.JRException: Could not load object from location : C:/project/report/reportTemplate_20110420000035982.jasper 
    at net.sf.jasperreports.engine.util.JRLoader.loadObjectFromLocation(JRLoader.java:262) 
    at net.sf.jasperreports.engine.util.JRLoader.loadObjectFromLocation(JRLoader.java:221) 
    at com.hp.proctool.reportmgt.customizer.IReportFactory.getJasperReportByTemplateName(IReportFactory.java:68) 
    at com.hp.proctool.reportmgt.service.ReportManager.getParametersByTemplateName(ReportManager.java:410) 
    at com.hp.proctool.reportmgt.service.ReportManager.getFieldJs(ReportManager.java:360) 
    at com.hp.proctool.reportmgt.service.ReportManager.generateReportDownloadForm(ReportManager.java:345) 
    at com.hp.proctool.reportmgt.service.ReportManager$$FastClassByCGLIB$$c444a9f1.invoke() 
    at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) 
    at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) 
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) 
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635) 
    at com.hp.proctool.reportmgt.service.ReportManager$$EnhancerByCGLIB$$1ab1a55e.generateReportDownloadForm() 
    at com.hp.proctool.reportmgt.web.ReportController.generateDownloadForm(ReportController.java:148) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:421) 
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:136) 
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:326) 
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:313) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at com.hp.common.orm.RightFilter.doFilter(RightFilter.java:73) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    at java.lang.Thread.run(Unknown Source)

來源

2011-04-20 diligent

綜觀JRLoader的源代碼在http://jasperreports.sourcearchive.com/documentation/3.6.0plus-pdfsg/JRLoader_8java-source.html，它看起來像這條線返回null爲您的文件。

File file = JRResourcesUtil.resolveFile(location, fileResolver);

似乎表明文件丟失或不是文件（即目錄）。

如果您撥打：

new File("C:/project/report/reportTemplate_20110420000035982.jasper").exists()

做你真的還是假的？

您可以嘗試致電JRLoader#loadObject()傳遞給您自己創建的FileInputStream嗎？

來源

2011-04-20 05:38:02

西蒙您好，感謝您的諮詢。我找到了原因。我檢查了Jasper文件路徑，它不存在。我忘了把碧玉文件放在那裏。 – diligent 2011-04-20 06:04:03

我使用這樣的技術，以確保道路

String subReportDir = ((HashMap<String, String>) dispatcher.getServletContext().getAttribute("local")).get("SUBREPORT_DIR"); 

    String reportPath = dispatcher.getServletContext().getRealPath(subReportDir) + "\\"; 
    String reportNamePath = dispatcher.getServletContext().getRealPath(subReportDir + reportName); 

    HashMap map = new HashMap(); 

    map.put("SUBREPORT_DIR", reportPath);//this is a parameter in the report in the subreport only put the report name.jasper 

String dbConnection = (String) dispatcher.getServletContext().getInitParameter("dbConnectionString"); 
      String dbUserName = (String) dispatcher.getServletContext().getInitParameter("dbUserName"); 
      String dbPassword = (String) dispatcher.getServletContext().getInitParameter("dbPassword"); 

      ReportGenerator reportGenerator; 
      reportGenerator = new ReportGenerator(reportNamePath, map, dbConnection, dbUserName, dbPassword);// 

      byte[] reportSteam = null; 
      SimpleDateFormat dt = new SimpleDateFormat("dd/MM/yyyy"); 
      String fileName = "Issue Statistics" + dt.format(new Date()); 

      reportSteam = reportGenerator.generateRTFReport(); 
      dispatcher.getRequest().setAttribute("mimeType", "application/msword"); 
      dispatcher.getRequest().setAttribute("fileName", fileName + ".doc"); 
      dispatcher.getRequest().setAttribute("fileBytes", reportSteam); 




public ReportGenerator(String reportPath, HashMap map, String dbConnection, String dbUserName, String dbPassword) { 

     this.reportPath = reportPath; 
     this.map = map; 
     this.dbConnection = dbConnection; 
     this.dbUserName = dbUserName; 
     this.dbPassword = dbPassword; 

    } 

    public byte[] generateRTFReport() 
    { 
     try 
     { 

      jasperReport = (JasperReport) JRLoader.loadObject(reportPath); 
      jasperPrint = JasperFillManager.fillReport(jasperReport, map, connectDB(dbConnection, dbUserName, dbPassword)); 

      rtfExporter = new JRRtfExporter(); 
      reportSteam = new ByteArrayOutputStream(); 
      rtfExporter.setParameter(JRExporterParameter.OUTPUT_STREAM, reportSteam); 
      rtfExporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint); 

      rtfExporter.exportReport(); 

      System.out.println("jasper loaded"); 

      return reportSteam.toByteArray(); 

     } 
     catch(Exception ex) 
     { 
      ex.printStackTrace(); 
      return null; 
     } 
     finally 
     { 
      try 
      { 
       reportSteam.close(); 
      } 
      catch(IOException io) 
      { 
       io.printStackTrace(); 
      } 
     } 
    }

來源

2014-01-07 06:55:36 shareef

jasper無法從位置加載對象

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