SSM数据库数据导出excel

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（）

 function exportExcel(){
             var myurl="${context}/assetInLibrary/export";
             var form=$("<form>");
             form.attr("style","display:none");
             form.attr("method","post");
             form.attr("action",myurl);
             $("body").append(form);
         }

2、在工具包中创建ViewExcel,继承AbstractExcelView

先上代码

 public class ViewExcel extends AbstractExcelView {

     private String[] titles;

     //传入指定的标题头
     public ViewExcel(String[] titles) {
         this.titles=titles;
     }

     @Override
     protected void buildExcelDocument(Map<String, Object> model,
             HSSFWorkbook workbook, HttpServletRequest request,
             HttpServletResponse response) throws Exception {
         //获取数据
         List<Map<String, String>> list = (List<Map<String, String>>) model.get("excelList");
         //在workbook添加一个sheet
         HSSFSheet sheet = workbook.createSheet();
         sheet.setDefaultColumnWidth(15);
         HSSFCell cell=null;
         //遍历标题
         for (int i = 0; i < titles.length; i++) {
             //获取位置
             cell = getCell(sheet, 0, i);
             setText(cell, titles[i]);
         }
         //数据写出
         for (int i = 0; i < list.size(); i++) {
             //获取每一个map
             Map<String, String> map=list.get(i);
             //一个map一行数据
             HSSFRow row = sheet.createRow(i+1);
             for (int j = 0; j < titles.length; j++) {
                 //遍历标题，把key与标题匹配
                 String title=titles[j];
                 //判断该内容存在mapzhong
                 if(map.containsKey(title)){
                     row.createCell(j).setCellValue(map.get(title));
                 }
             }
         }
          //设置下载时客户端Excel的名称
         String filename = new SimpleDateFormat("yyyy-MM-dd").format(new Date())+".xls";
         response.setContentType("application/vnd.ms-excel");
         response.setHeader("Content-disposition", "attachment;filename=" + filename);
         OutputStream ouputStream = response.getOutputStream();
         workbook.write(ouputStream);
         ouputStream.flush();
         ouputStream.close();
     }

 }

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

 public List<Map<String, String>> selectAllAssetInlibraryInfo() {
         List<AssetInlibrary> list = assetInlibraryMapper.selectByExample(null);
         List<Map<String, String>> mapList=new ArrayList<Map<String,String>>();
         for (AssetInlibrary assetInlibrary : list) {
             Map<String, String> map=new HashMap<String, String>();
             map.put("编号", assetInlibrary.getId()+"");
             map.put("资产名称", assetInlibrary.getTitle());
             AssetType assetType = assetTypeMapper.selectByPrimaryKey(assetInlibrary.getAssetTypeId());
             map.put("资产类型", assetType.getTitle());
             AssetBrand assetBrand = assetBrandMapper.selectByPrimaryKey(assetInlibrary.getAssetBrandId());
             map.put("资产品牌", assetBrand.getTitle());
             AssetStorage assetStorage = assetStorageMapper.selectByPrimaryKey(assetInlibrary.getAssetStorageId());
             map.put("资产存放地点", assetStorage.getTitle());
             AssetProvider assetProvider = assetProviderMapper.selectByPrimaryKey(assetInlibrary.getAssetProviderId());
             map.put("资产供应商", assetProvider.getTitle());
             mapList.add(map);
         }
         return mapList;
     }

4、controller中的数据交互

 @RequestMapping("/assetInLibrary/export")
     public ModelAndView export(ModelMap map) throws Exception{
         List<Map<String,String>> list = assetInLibraryService.selectAllAssetInlibraryInfo();
         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"};
         ViewExcel excel=new ViewExcel(titles);
         map.put("excelList", list);
         return new ModelAndView(excel,map);
     }

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