org.springframework.web.servlet.view.document
Class AbstractExcelView

java.lang.Object
  org.springframework.context.support.ApplicationObjectSupport
      org.springframework.web.context.support.WebApplicationObjectSupport
          org.springframework.web.servlet.view.AbstractView
              org.springframework.web.servlet.view.document.AbstractExcelView

All Implemented Interfaces:

BeanNameAware, ApplicationContextAware, ServletContextAware, View

public abstract class AbstractExcelView
extends AbstractView

Convenient superclass for Excel document views. Compatible with Apache POI 3.0 as well as 3.5, as of Spring 3.0.

Properties:

• url (optional): The url of an existing Excel document to pick as a starting point. It is done without localization part nor the ".xls" extension.

The file will be searched with locations in the following order:

• [url]_[language]_[country].xls
• [url]_[language].xls
• [url].xls

For working with the workbook in the subclass, see Jakarta's POI site

As an example, you can try this snippet:

 protected void buildExcelDocument(
     Map<String, Object> model, HSSFWorkbook workbook,
     HttpServletRequest request, HttpServletResponse response) {

   // Go to the first sheet.
   // getSheetAt: only if workbook is created from an existing document
         // HSSFSheet sheet = workbook.getSheetAt(0);
         HSSFSheet sheet = workbook.createSheet("Spring");
         sheet.setDefaultColumnWidth(12);

   // Write a text at A1.
   HSSFCell cell = getCell(sheet, 0, 0);
   setText(cell, "Spring POI test");

   // Write the current date at A2.
   HSSFCellStyle dateStyle = workbook.createCellStyle();
   dateStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy"));
   cell = getCell(sheet, 1, 0);
   cell.setCellValue(new Date());
   cell.setCellStyle(dateStyle);

   // Write a number at A3
   getCell(sheet, 2, 0).setCellValue(458);

   // Write a range of numbers.
   HSSFRow sheetRow = sheet.createRow(3);
   for (short i = 0; i < 10; i++) {
     sheetRow.createCell(i).setCellValue(i * 10);
   }
 }

This class is similar to the AbstractPdfView class in usage style.

Author:

Jean-Pierre Pawlak, Juergen Hoeller

See Also:

AbstractPdfView

Field Summary

Fields inherited from class org.springframework.web.servlet.view.AbstractView

DEFAULT_CONTENT_TYPE

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

logger

Fields inherited from interface org.springframework.web.servlet.View

RESPONSE_STATUS_ATTRIBUTE

Constructor Summary

AbstractExcelView()
Default Constructor.

Method Summary

protected abstract void	buildExcelDocument(Map<String,Object> model, HSSFWorkbook workbook, HttpServletRequest request, HttpServletResponse response) Subclasses must implement this method to create an Excel HSSFWorkbook document, given the model.
protected boolean	generatesDownloadContent() Return whether this view generates download content (typically binary content like PDF or Excel files).
protected HSSFCell	getCell(HSSFSheet sheet, int row, int col) Convenient method to obtain the cell in the given sheet, row and column.
protected HSSFWorkbook	getTemplateSource(String url, HttpServletRequest request) Creates the workbook from an existing XLS document.
protected void	renderMergedOutputModel(Map<String,Object> model, HttpServletRequest request, HttpServletResponse response) Renders the Excel view, given the specified model.
protected void	setText(HSSFCell cell, String text) Convenient method to set a String as text content in a cell.
void	setUrl(String url) Set the URL of the Excel workbook source, without localization part nor extension.

Methods inherited from class org.springframework.web.servlet.view.AbstractView

addStaticAttribute, createRequestContext, createTemporaryOutputStream, exposeModelAsRequestAttributes, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, prepareResponse, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setRequestContextAttribute, toString, writeToResponse

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

getApplicationContext, getMessageSourceAccessor, initApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AbstractExcelView

public AbstractExcelView()

Default Constructor. Sets the content type of the view to "application/vnd.ms-excel".

Method Detail

setUrl

public void setUrl(String url)

Set the URL of the Excel workbook source, without localization part nor extension.

generatesDownloadContent

protected boolean generatesDownloadContent()

Description copied from class: AbstractView

Return whether this view generates download content (typically binary content like PDF or Excel files).

The default implementation returns false. Subclasses are encouraged to return true here if they know that they are generating download content that requires temporary caching on the client side, typically via the response OutputStream.

Overrides:

generatesDownloadContent in class AbstractView

See Also:

AbstractView.prepareResponse(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse), ServletResponse.getOutputStream()

renderMergedOutputModel

protected final void renderMergedOutputModel(Map<String,Object> model,
                                             HttpServletRequest request,
                                             HttpServletResponse response)
                                      throws Exception

Renders the Excel view, given the specified model.

Specified by:

renderMergedOutputModel in class AbstractView

Parameters:

model - combined output Map (never null), with dynamic values taking precedence over static attributes

request - current HTTP request

response - current HTTP response

Throws:

Exception - if rendering failed

getTemplateSource

protected HSSFWorkbook getTemplateSource(String url,
                                         HttpServletRequest request)
                                  throws Exception

Creates the workbook from an existing XLS document.

Parameters:

url - the URL of the Excel template without localization part nor extension

request - current HTTP request

Returns:

the HSSFWorkbook

Throws:

Exception - in case of failure

buildExcelDocument

protected abstract void buildExcelDocument(Map<String,Object> model,
                                           HSSFWorkbook workbook,
                                           HttpServletRequest request,
                                           HttpServletResponse response)
                                    throws Exception

Subclasses must implement this method to create an Excel HSSFWorkbook document, given the model.

Parameters:

model - the model Map

workbook - the Excel workbook to complete

request - in case we need locale etc. Shouldn't look at attributes.

response - in case we need to set cookies. Shouldn't write to it.

Throws:

Exception

getCell

protected HSSFCell getCell(HSSFSheet sheet,
                           int row,
                           int col)

Convenient method to obtain the cell in the given sheet, row and column.

Creates the row and the cell if they still doesn't already exist. Thus, the column can be passed as an int, the method making the needed downcasts.

Parameters:

sheet - a sheet object. The first sheet is usually obtained by workbook.getSheetAt(0)

row - thr row number

col - the column number

Returns:

the HSSFCell

setText

protected void setText(HSSFCell cell,
                       String text)

Convenient method to set a String as text content in a cell.

Parameters:

cell - the cell in which the text must be put

text - the text to put in the cell