struts 2在调用堆栈中找不到名为[excelStream]的java.io.InputStream

本文介绍了struts 2在调用堆栈中找不到名为[excelStream]的java.io.InputStream的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ excelStreamI正在尝试下载一个excel文件。excelStreamI am trying to download an excel file.在我的Action类中In my Action classpublic class ActivityTrackerExlReportAction extends BaseAction{private InputStream excelStream;private UserMasterDTO userMasterDTO;public InputStream getExcelStream(){ return excelStream;}public void setExcelStream(InputStream excelStream) {this.excelStream = excelStream;}ByteArrayOutputStream outputStream = new ByteArrayOutputStream();WorkbookSettings wbSettings = new WorkbookSettings();try{ response.setHeader("Content-Disposition", "attachment; filename=/timesheet.xls"); wbSettings.setLocale(new Locale("en", "EN")); WritableWorkbook workbook = Workbook.createWorkbook(outputStream, wbSettings); workbook.createSheet("Report", 0); WritableSheet excelSheet = workbook.getSheet(0); service.createLabel(excelSheet); service.createContent(excelSheet); workbook.write(); ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray()); setExcelStream(inputStream); workbook.close(); outStream.flush(); outStream.close();}catch(Exception e){}finally{// outStream.close(); } return "generateReport}我的 struts.xml 包含：<result type="stream" name="generateReport"> <param name="contentType">"application/vnd.ms-excel"</param> <param name="inputName">excelStream</param> <param name="bufferSize">1024</param></result>我正在使用 JXL 来创建和编写一个Excel表格，为什么我会收到错误以及如何解决错误？找不到 java.io.InputStream 在调用堆栈中的名称为 [excelStream]I am using JXL to create and write an Excel sheet. Why am i getting the error and how to get out of it? Can not find a java.io.InputStream with the name [excelStream] in the invocation stack我是StackTraces：My are Stacktraces: org.apache.struts2.dispatcher.StreamResult.doExecute（StreamRes ult.java:237）org.apache.struts2.dispatcher.StreamResult.doExecute(StreamResult.java:237) org.apache.struts2.dispatcher.StrutsResultSupport.execute（StrutsResultSupport.java:186） .......org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186) .......推荐答案 编辑在新发布的代码中，您正在执行两个不好的事情：In the new posted code, you are doing two "bad" things: 1）您正在吞下异常这真的是错误的;放一个e.printStackTrace();在您的catch(Exception e){}阻止，你会看到Exception可能是被扔，抓住并没有显示;block, and you will see the Exception that is probably being throwed, catched and not showed; 2）即使你得到一个异常 99.9％发生了什么）这将导致Struts2 Stream的结果试图达到未被初始化的excelStream变量（由于异常）。2) You are returning the same result even if you get an Exception, (that is 99.9% what is happening); this will result in Struts2 Stream result trying to reach the excelStream variable that was never initialized (because of the exception).如果出现错误，您应该返回一个全局（或本地）错误结果类型，JSP显示错误，而不是Stream结果类型。In case of error, you should return an global (or local) error result type, with a JSP showing the error, instead of a Stream result type.打印异常，更正代码，然后一切都会正常：）Print the exception, correct the code, and then everything will be alright :) PS：请避免直接在回复中写入，使用Stream结果类型中的contentDisposition。P.S: Please avoid writing in the response directly, use contentDisposition from the Stream result type.错误是 <param name="inputName">excelstream</param>应该是 <param name="inputName">excelStream</param>Always use camelCase (as you did in the Action, but not in struts config).显然，ContentDisposition应该被删除，或设置一个适当的值，如And obviously contentDisposition should be removed, or set with a proper value, like <param name="contentDisposition">attachment; filename="myExcel.xls"</param> 这篇关于struts 2在调用堆栈中找不到名为[excelStream]的java.io.InputStream的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！