首先，这是我对自己的需求而使用的逻辑，若有可以完美的地方方便告诉下小白。
apache的poi MAVEN
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.16</version>
</dependency>
1、前端页面，伪异步（页面不刷新）
为什么不用ajax呢？
JQuery的ajax函数的返回类型只有xml、text、json、html等类型，没有“流”类型。所以就用js做个form表单请求
上代码（）
1 function exportExcel(){ 2 var myurl="${context}/assetInLibrary/export"; 3 var form=$("<form>"); 4 form.attr("style","display:none"); 5 form.attr("method","post"); 6 form.attr("action",myurl); 7 $("body").append(form); 8 }
2、在工具包中创建ViewExcel,继承AbstractExcelView
先上代码
1 public class ViewExcel extends AbstractExcelView { 2 3 private String[] titles; 4 5 //传入指定的标题头 6 public ViewExcel(String[] titles) { 7 this.titles=titles; 8 } 9 10 @Override 11 protected void buildExcelDocument(Map<String, Object> model, 12 HSSFWorkbook workbook, HttpServletRequest request, 13 HttpServletResponse response) throws Exception { 14 //获取数据 15 List<Map<String, String>> list = (List<Map<String, String>>) model.get("excelList"); 16 //在workbook添加一个sheet 17 HSSFSheet sheet = workbook.createSheet(); 18 sheet.setDefaultColumnWidth(15); 19 HSSFCell cell=null; 20 //遍历标题 21 for (int i = 0; i < titles.length; i++) { 22 //获取位置 23 cell = getCell(sheet, 0, i); 24 setText(cell, titles[i]); 25 } 26 //数据写出 27 for (int i = 0; i < list.size(); i++) { 28 //获取每一个map 29 Map<String, String> map=list.get(i); 30 //一个map一行数据 31 HSSFRow row = sheet.createRow(i+1); 32 for (int j = 0; j < titles.length; j++) { 33 //遍历标题，把key与标题匹配 34 String title=titles[j]; 35 //判断该内容存在mapzhong 36 if(map.containsKey(title)){ 37 row.createCell(j).setCellValue(map.get(title)); 38 } 39 } 40 } 41 //设置下载时客户端Excel的名称 42 String filename = new SimpleDateFormat("yyyy-MM-dd").format(new Date())+".xls"; 43 response.setContentType("application/vnd.ms-excel"); 44 response.setHeader("Content-disposition", "attachment;filename=" + filename); 45 OutputStream ouputStream = response.getOutputStream(); 46 workbook.write(ouputStream); 47 ouputStream.flush(); 48 ouputStream.close(); 49 } 50 51 }
在构造函数中传进来需导出的titles，也就是excel中的标题头，这个逻辑会有点麻烦，因为我是创建Map，让dao中查出来的数据根据我的Map（‘title’,'value'）进行封装，且title要存在于传进来的titles中，剩下看源码就能明白
3、service中的数据封装
1 public List<Map<String, String>> selectAllAssetInlibraryInfo() { 2 List<AssetInlibrary> list = assetInlibraryMapper.selectByExample(null); 3 List<Map<String, String>> mapList=new ArrayList<Map<String,String>>(); 4 for (AssetInlibrary assetInlibrary : list) { 5 Map<String, String> map=new HashMap<String, String>(); 6 map.put("编号", assetInlibrary.getId()+""); 7 map.put("资产名称", assetInlibrary.getTitle()); 8 AssetType assetType = assetTypeMapper.selectByPrimaryKey(assetInlibrary.getAssetTypeId()); 9 map.put("资产类型", assetType.getTitle()); 10 AssetBrand assetBrand = assetBrandMapper.selectByPrimaryKey(assetInlibrary.getAssetBrandId()); 11 map.put("资产品牌", assetBrand.getTitle()); 12 AssetStorage assetStorage = assetStorageMapper.selectByPrimaryKey(assetInlibrary.getAssetStorageId()); 13 map.put("资产存放地点", assetStorage.getTitle()); 14 AssetProvider assetProvider = assetProviderMapper.selectByPrimaryKey(assetInlibrary.getAssetProviderId()); 15 map.put("资产供应商", assetProvider.getTitle()); 16 mapList.add(map); 17 } 18 return mapList; 19 }
4、controller中的数据交互
1 @RequestMapping("/assetInLibrary/export") 2 public ModelAndView export(ModelMap map) throws Exception{ 3 List<Map<String,String>> list = assetInLibraryService.selectAllAssetInlibraryInfo(); 4 String[] titles={"编号","资产名称","资产类型","资产品牌","资产存放地点","资产供应商"}; 5 ViewExcel excel=new ViewExcel(titles); 6 map.put("excelList", list); 7 return new ModelAndView(excel,map); 8 }
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