在 spring 3.x 中实现 SimpleFormController 时不会调用 commandClass setter 方法，在命令 odject 上调用 getter 方法返回 null 值。
uploadMessageBundle.jsp
<div class="instruction"> <spring:message code="messagebundle.upload.instruction"/> </div> <form method="post" action="uploadMessageBundle.htm" enctype="multipart/form-data"> <input type="file" name="file"/><br/> <spring:bind path="command.locale"> <select name="${status.expression}"> <c:forEach var="locale" items="${locales}" varStatus="status"> <option value="${locale}">${locale}</option> </c:forEach> </select> </spring:bind> <br/> <table> <tr> <td class="form_text"></td> <td> <input type="submit" name="_target1" class="active" value="<spring:message code='messagebundle.upload' />"/> <input type="submit" name="_cancel" value="<spring:message code='messagebundle.cancle'/>"/> </td> </tr> </table> </form> </div> <jsp:directive.include file="/templates/footer.jsp"/>UploadMessageBundleController.java
package org.sakaiproject.adminmessagebundle.tool; import org.sakaiproject.messagebundle.api.MessageBundleService; import org.sakaiproject.messagebundle.api.MessageBundleProperty; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.springframework.beans.BeanUtils; import org.springframework.validation.BindException; import org.springframework.web.bind.ServletRequestDataBinder; import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.ByteArrayInputStream; import java.io.FileInputStream; import java.io.InputStream; import java.util.*; public class UploadMessageBundleController extends AbstractUploadController { MessageBundleService messageBundleService; protected Map referenceData(HttpServletRequest request) throws Exception { Map map = new HashMap(); map.put("locales",messageBundleService.getLocales()); return map; } protected void doSubmitAction(Object command) throws Exception { try { setCommandClass(FileUploadBean.class); setCommandName("command"); setSuccessView("messageBundleHome"); setFormView("uploadMessageBundle"); FileUploadBean fileUploadBean = (FileUploadBean) command; List properties = new ArrayList(); InputStream myxls = new ByteArrayInputStream(fileUploadBean.getFile()); HSSFWorkbook wb = new HSSFWorkbook(myxls); HSSFSheet sheet = wb.getSheetAt(0); // first sheet int rows = 0; boolean foundHeaderRow = false; for (Iterator i =sheet.rowIterator();i.hasNext();) { HSSFRow row = (HSSFRow) i.next(); if ("module".equals(row.getCell((short)0).getStringCellValue())) { foundHeaderRow = true; continue; } if (foundHeaderRow) { MessageBundleProperty mbp = new MessageBundleProperty(); mbp.setModuleName(row.getCell((short)0).getStringCellValue()); mbp.setBaseName(row.getCell((short)1).getStringCellValue()); mbp.setPropertyName(row.getCell((short)2).getStringCellValue()); mbp.setValue(row.getCell((short)3).getStringCellValue()); mbp.setLocale(fileUploadBean.getLocale()); //TODO allow an optional 5 column for new translations properties.add(mbp); rows++; } } if (foundHeaderRow == false) { throw new Exception("Invalid excel file, can't find header row"); } fileUploadBean.setRows(messageBundleService.importProperties(properties)); }catch(Exception e) { e.printStackTrace(); } } protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception { // when done, redirect to the main page and specify the "command" http parameter ModelAndView modelAndView = null; FileUploadBean fileUploadBean = (FileUploadBean) command; if (isCancel(request)) { modelAndView = new ModelAndView(getSuccessView(), "command", "list"); modelAndView.addObject("msg", "Upload Cancelled"); } else { try { doSubmitAction(command); modelAndView = new ModelAndView(getSuccessView(), "command", "list"); modelAndView.addObject("msg", "Upload " + fileUploadBean.getRows() + " properties for locale " + fileUploadBean.getLocale()); } catch (Exception ex) { modelAndView = new ModelAndView(getSuccessView(), "command", "list"); Map model = modelAndView.getModel(); model.put("error", ex.getMessage()); logger.warn("",ex); } } return modelAndView; } protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws ServletException { // to actually be able to convert Multipart instance to byte[] // we have to register a custom editor binder.registerCustomEditor(byte[].class, new ByteArrayMultipartFileEditor()); // now Spring knows how to handle multipart object and convert them } public void setMessageBundleService(MessageBundleService messageBundleService) { this.messageBundleService = messageBundleService; } }
** xml 文件中的 bean 配置**
<bean id="uploadMessageBundleController" class="org.sakaiproject.adminmessagebundle.tool.UploadMessageBundleController">
<property name="messageBundleService"><ref bean="org.sakaiproject.messagebundle.api.MessageBundleService"/></property>
<property name="commandClass" value="org.sakaiproject.adminmessagebundle.tool.FileUploadBean"/>
<property name="commandName" value="command"/>
<property name="formView" value="uploadMessageBundle"/>
<property name="successView" value="redirect:messageBundleHome.htm"/>
</bean>