先看源码。分为三个部分
实体类:
java
import cn.afterturn.easypoi.excel.annotation.Excel;
import lombok.Getter;
import lombok.Setter;
import java.io.Serializable;
import java.math.BigDecimal;
@Getter
@Setter
public class ErpStoreVo implements Serializable {
@Excel(name = "店铺编号")
private String storeNo;
@Excel(name = "店铺名称")
private String name;
@Excel(name = "启用状态")
private String enableStatus;
...等等其他属性
}这是导出部分的代码:
java
//下载导入模板 第一个方法
@PostMapping("/importStoreModel")
public void importStoreModel(HttpServletResponse response) throws Exception {
List<ErpStoreVo> vo = new ArrayList<>();
exportExcel(response, "店铺信息记录", ErpStoreVo.class, BaseUtil.copyList(vo, ErpStoreVo.class));
}
//第二个方法
import cn.afterturn.easypoi.excel.ExcelExportUtil;
private void exportExcel(HttpServletResponse response, String outputName, Class<?> clazz, List<?> list) throws Exception {
response.setCharacterEncoding("UTF-8");
String fileName = URLEncoder.encode(outputName, "UTF-8");
response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".xlsx");
response.setContentType("application/vnd.openxmlformats- officedocument.spreadsheetml.sheet");
response.addHeader("Access-Control-Expose-Headers", "Content-Disposition");
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
response.addHeader("Access-Control-Allow-Headers",
"Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers,token");
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), clazz, list);
//workbook.write(response.getOutputStream());
ServletOutputStream os = response.getOutputStream();
workbook.write(os);
os.close();
}导出的时候会报错:
java
cn.afterturn.easypoi.exception.excel.ExcelExportException: Excel导出错误
at cn.afterturn.easypoi.excel.export.ExcelExportService.createSheet(ExcelExportService.java:181)
at cn.afterturn.easypoi.excel.ExcelExportUtil.exportExcel(ExcelExportUtil.java:116)
at cn.erp.pm.PmController.exportExcel(PmController.java:198)
at cn.erp.pm.PmController.importStoreModel(PmController.java:220)
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:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:523)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
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.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
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:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
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:541)
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:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594)
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)
Caused by: java.lang.NullPointerException: null
at cn.afterturn.easypoi.excel.export.ExcelExportService.createSheetForMap(ExcelExportService.java:219)
at cn.afterturn.easypoi.excel.export.ExcelExportService.createSheet(ExcelExportService.java:178)
... 50 common frames omitted后来修正了第一个方法,就不再报错 -- 添加了实体类记录
java
@PostMapping("/importStoreModel")
public void importStoreModel(HttpServletResponse response) throws Exception {
List<ErpStoreVo> vo = new ArrayList<>();
//没有数据时手动加一条防止报错
vo.add(new ErpStoreVo());
exportExcel(response, "店铺信息记录", ErpStoreVo.class, BaseUtil.copyList(vo, ErpStoreVo.class));
}