org.apache.xmlbeans.impl.values.XmlValueDisconnectedException: null

今天使用poi解析Excel的时候遇到一个错误，记录一下

org.apache.xmlbeans.impl.values.XmlValueDisconnectedException: null
	at org.apache.xmlbeans.impl.values.XmlObjectBase.check_dated(XmlObjectBase.java:1274)
	at org.apache.xmlbeans.impl.values.XmlObjectBase.getStringValue(XmlObjectBase.java:1529)
	at org.apache.poi.xssf.usermodel.XSSFCell.convertSharedFormula(XSSFCell.java:491)
	at org.apache.poi.xssf.usermodel.XSSFCell.getCellFormula(XSSFCell.java:469)
	at org.apache.poi.xssf.usermodel.XSSFSheet.onDeleteFormula(XSSFSheet.java:4646)
	at org.apache.poi.xssf.usermodel.XSSFCell.setCellType(XSSFCell.java:929)
	at org.apache.poi.xssf.usermodel.XSSFCell.setCellTypeImpl(XSSFCell.java:916)
	at org.apache.poi.ss.usermodel.CellBase.setCellType(CellBase.java:57)
	at com.company.project.common.utils.TransitionalUtil.getCellStringValue(TransitionalUtil.java:75)
	at com.company.project.controller.SysFilesController.bomUpload(SysFilesController.java:366)
	at com.company.project.controller.SysFilesController$$FastClassBySpringCGLIB$$739b2825.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
	at com.company.project.controller.SysFilesController$$EnhancerBySpringCGLIB$$81421ddf.bomUpload(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	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:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.github.xiaoymin.knife4j.spring.filter.ProductionSecurityFilter.doFilter(ProductionSecurityFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.github.xiaoymin.knife4j.spring.filter.SecurityBasicAuthFilter.doFilter(SecurityBasicAuthFilter.java:90)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
	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:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

这个问题很奇怪，把表格内容复制一份到其他sheet或者复制到其他表格重新解析，它又很神奇的好了，这个也是个很大的坑。

贴一下我解决的工具类代码

public static String getCellStringValue(Cell cell) {
		CellType cellType = cell.getCellType();
		if (cellType.getCode()!= 1) {
			cell.setCellType(CellType.STRING);
		}
		String stringCellValue = cell.getStringCellValue().trim();
		if(stringCellValue!=null)return stringCellValue;

		switch (cell.getCellType()) {
			case BOOLEAN:
				return cell.getBooleanCellValue() ? "TRUE" : "FALSE";
			case FORMULA:
				try {
					String result = String.valueOf(cell.getNumericCellValue());
					if (result.endsWith(".0")) {
						String[] strs = result.split("\\.0");
						result = strs[0];
					}
					return result;
				} catch (IllegalStateException e) {
					try {
						return String.valueOf(cell.getRichStringCellValue());
					} catch (Exception e1) {
						return cell.getCellFormula();
					}
				}
			case NUMERIC:
				cell.setCellType(CellType.STRING);
				return cell.getStringCellValue();
			case STRING:
				String result = cell.getRichStringCellValue().getString(); //cell.getStringCellValue();

				try {
					// 常规的字符串类型有时会被误判为百分比形式的，所以放到try里面
					String style = cell.getCellStyle().getDataFormatString();
					if(style.indexOf("%") == -1) {
						String pattern = "\\d{" + result.length() + "}";
						Matcher matcher = Pattern.compile(pattern).matcher(result);

						if(result.startsWith("0") && matcher.find()) {
							return result;
						}
					}

					if(!Pattern.compile("[a-zA-Z]").matcher(result).find()) {
						// 对于有些cell中是常规类型的数字，但是会被解析成double类型变成科学计数法
						DecimalFormat df = new DecimalFormat("####################.####################");
						result = df.format(Double.parseDouble(result));
					}

					// 常规的字符串类型有时会被误判为百分比形式的，所以放到try里面
					if (style.indexOf("%") != -1) {
						result = String.valueOf(Double.parseDouble(result)*100) + "%";
					}
				} catch (Exception e) {
					//logger.error(e.getMessage());
					//logger.error(e.getMessage(), e);
				}

				return result;
			default:
				return ""; // 如果什么都没有，就返回空值。
		}
	}