excel複雜表頭匯出
工作中，我們經常會遇到一些excel匯入，匯出的需求。我們通常可以使用poi等提供的api來處理。但是處理起來，程式碼十分臃腫很不優雅。
不經意的一次，檢視很久之前的程式碼，看到以前一位同事前輩，針對此問題就已經對excel匯出做出了一次比較好的封裝，使用到的技術AbstractView+Jxls,對於jxls,網上有許多資料，不瞭解的同學可以先找些資料瞭解下。
http://jxls.sourceforge.net/getting_started.html
廢話不多說直接上程式碼：
1.controller接收web請求
@RequestMapping("/xls")
public ModelAndView xls() {
List<PostDiagnoseInfoResponseBean> infoList = homeAppService.getPostDiagnoseInfo("W9432503");
ModelMap modelMap = new ModelMap();
String fileName = "DiagnoseInfo檔案.xls";
modelMap.put("list", infoList);
modelMap.put("ExcelExportFileName", fileName);
modelMap.put("ExcelTemplateFileName", "diagnose-template.xls");
modelMap.put("fileName", fileName);
return new ModelAndView(new JXLSExcelView(), modelMap);
}
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2.JXLSExcelView整合AbstractView,程式碼如下：
public class JXLSExcelView extends AbstractView {
public static final String EXCEL_EXPORT_FILE_NAME = "ExcelExportFileName";
public static final String EXCEL_TEMPLATE_FILE_NAME = "ExcelTemplateFileName";
public static final String EXCEL_SHEET_NAMES = "ExcelSheetNames";
/** The content type for an Excel response */
private static final String CONTENT_TYPE = "application/vnd.ms-excel";
private XLSTransformerExt transformer;
/**
* Default Constructor.
* Sets the content type of the view to "application/vnd.ms-excel".
*/
public JXLSExcelView() {
transformer = new XLSTransformerExt();
setContentType(CONTENT_TYPE);
}
@Override
protected boolean generatesDownloadContent() {
return true;
}
@SuppressWarnings("rawtypes")
@Override
protected void renderMergedOutputModel(Map<String, Object> model,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
String fileName = (String)model.get(EXCEL_EXPORT_FILE_NAME);
String templateName = (String)model.get(EXCEL_TEMPLATE_FILE_NAME);
List newSheetNames = (List)model.get(EXCEL_SHEET_NAMES);
response.setHeader("content-disposition","attachment; filename="+new String(fileName.getBytes("gb2312"),"ISO8859-1"));
String srcFilePath = "/resources/excel/" + templateName;
ServletOutputStream out = response.getOutputStream();
transformer.transformXLS(request.getSession().getServletContext(), srcFilePath, model, out);
out.flush();
}
}
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3.XLSTransformerExt繼承XLSTransformer,程式碼如下：
public class XLSTransformerExt extends XLSTransformer {
@SuppressWarnings("rawtypes")
public void transformXLS(ServletContext servletContext, String srcFilePath, Map beanParams, OutputStream os) {
try {
ServletContextResource resource = new ServletContextResource(servletContext, srcFilePath);
Workbook workbook = transformXLS(resource.getInputStream(), beanParams);
workbook.write(os);
} catch (Exception e) {
e.printStackTrace();
}
}
}
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4.excel模板
5.maven依賴
<properties>
<jxls.version>1.0</jxls.version>
</properties>
<!-- excel 匯出或讀取 -->
<dependency>
<groupId>net.sf.jxls</groupId>
<artifactId>jxls-core</artifactId>
<version>${jxls.version}</version>
</dependency>
<dependency>
<groupId>net.sf.jxls</groupId>
<artifactId>jxls-reader</artifactId>
<version>${jxls.version}</version>
</dependency>
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對於上述的需求，相信應該能滿足大多數的excel匯出需求了。但是相信還是有不少人遇到過這種需求，匯出的excel列是動態變化的，即使是同一張報表匯出，針對不同的人需要匯出不同的列。這種場景下，上述的解決方法就無法滿足需求了。
如何解決這種需求呢，大致的解決思路應該都差不多，無非是接收一個表頭header[]陣列，取值key[]陣列，以及資料list即可，正當磨拳擦掌準備大幹一場的時候，仔細翻閱了jxls的最新版本，發現已經支援博主的類似需求,請查閱：http://jxls.sourceforge.net/samples/dynamic_grid.html，有了這個指導性檔案，實現起來就很簡單了:
1.controller接收web請求
@RequestMapping("/xls2")
public ModelAndView xls2() {
ModelMap modelMap = new ModelMap();
modelMap.put(JXLSExcelViewDynamicColumns.EXCEL_EXPORT_FILE_NAME, "dynamic-columns檔案-20170622.xls");
modelMap.addAttribute(JXLSExcelViewDynamicColumns.EXCEL_TEMPLATE_DATA_NAME, homeAppService.getPostDiagnoseInfo("W9432503"));
modelMap.put(JXLSExcelViewDynamicColumns.EXCEL_TEMPLATE_HEADERS_NAME, new String[]{"模型id", "模型名稱", "因子型別"});
modelMap.put(JXLSExcelViewDynamicColumns.EXCEL_TEMPLATE_INDEXS_NAME, new String[]{"modelId", "modelName", "modelType"});
return new ModelAndView(new JXLSExcelViewDynamicColumns(), modelMap);
}
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2.JXLSExcelViewDynamicColumns繼承AbstractView
public class JXLSExcelViewDynamicColumns extends AbstractView {
public static final String EXCEL_EXPORT_FILE_NAME = "ExcelExportFileName";
public static final String EXCEL_TEMPLATE_FILE_NAME = "ExcelTemplateFileName";
public static final String EXCEL_DEFAULT_TEMPLATE_FILE = "dynamic-columns.xls";
/** The content type for an Excel response */
private static final String CONTENT_TYPE = "application/vnd.ms-excel";
public static final String EXCEL_TEMPLATE_HEADERS_NAME = "headers";
public static final String EXCEL_TEMPLATE_INDEXS_NAME = "indexs";
public static final String EXCEL_TEMPLATE_DATA_NAME = "data";
/**
* Default Constructor.
* Sets the content type of the view to "application/vnd.ms-excel".
*/
public JXLSExcelViewDynamicColumns() {
setContentType(CONTENT_TYPE);
}
@Override
protected boolean generatesDownloadContent() {
return true;
}
@SuppressWarnings("rawtypes")
@Override
protected void renderMergedOutputModel(Map<String, Object> model,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
String fileName = (String)model.get(EXCEL_EXPORT_FILE_NAME);
response.setHeader("content-disposition","attachment; filename="+new String(fileName.getBytes("gb2312"),"ISO8859-1"));
String templateName = model.get(EXCEL_TEMPLATE_FILE_NAME) == null ? EXCEL_DEFAULT_TEMPLATE_FILE : model.get(EXCEL_TEMPLATE_FILE_NAME).toString() ;
String srcFilePath = "/resources/excel/" + templateName;
ServletOutputStream out = response.getOutputStream();
ServletContextResource resource = new ServletContextResource(request.getSession().getServletContext(), srcFilePath);
List headers = Arrays.asList((String[])model.get(EXCEL_TEMPLATE_HEADERS_NAME));
List indexs = Arrays.asList((String[])model.get(EXCEL_TEMPLATE_INDEXS_NAME));
String objectProps = StringUtils.join(indexs,",");
Context context = new Context();
context.putVar(EXCEL_TEMPLATE_HEADERS_NAME, headers);//headers是list
context.putVar(EXCEL_TEMPLATE_DATA_NAME, model.get(EXCEL_TEMPLATE_DATA_NAME));
JxlsHelper.getInstance().processGridTemplate(resource.getInputStream(), out, context,objectProps );//objectProps “a,b,c”字串
out.flush();
}
}
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3.excel-template模板
差點忘了，最新版本jxls的maven依賴：
<dependency>
<groupId>org.jxls</groupId>
<artifactId>jxls</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>org.jxls</groupId>
<artifactId>jxls-poi</artifactId>
<version>1.0.9</version>
</dependency>
<dependency>
<groupId>org.jxls</groupId>
<artifactId>jxls-jexcel</artifactId>
<version>1.0.6</version>
</dependency>
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版權宣告：本文為CSDN博主「伊布拉西莫」的原創文章，遵循CC 4.0 BY-SA版權協議，轉載請附上原文出處連結及本宣告。
原文連結：https://blog.csdn.net/it_freshman/article/details/73611452