SSM數據庫數據導出excel

首先，這是我對自己的需求而使用的邏輯，若有可以完美的地方方便告訴下小白。

apache的poi MAVEN

 

<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.16</version>
 </dependency>

 

 

 

1、前端頁面，偽異步（頁面不刷新）

為什么不用ajax呢？

JQuery的ajax函數的返回類型只有xml、text、json、html等類型，沒有“流”類型。所以就用js做個form表單請求

上代碼（）

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、在工具包中創建ViewExcel,繼承AbstractExcelView

先上代碼

public class ViewExcel extends AbstractExcelView {

    private String[] titles;
    
    //傳入指定的標題頭
    public ViewExcel(String[] titles) {
        this.titles=titles;
    }
    
    @Override
    protected void buildExcelDocument(Map<String, Object> model,
            HSSFWorkbook workbook, HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        //獲取數據
        List<Map<String, String>> list = (List<Map<String, String>>) model.get("excelList");
        //在workbook添加一個sheet
        HSSFSheet sheet = workbook.createSheet();
        sheet.setDefaultColumnWidth(15);
        HSSFCell cell=null;
        //遍歷標題
        for (int i = 0; i < titles.length; i++) {
            //獲取位置
            cell = getCell(sheet, 0, i);
            setText(cell, titles[i]);
        }
        //數據寫出
        for (int i = 0; i < list.size(); i++) {
            //獲取每一個map
            Map<String, String> map=list.get(i);
            //一個map一行數據
            HSSFRow row = sheet.createRow(i+1);
            for (int j = 0; j < titles.length; j++) {
                //遍歷標題，把key與標題匹配
                String title=titles[j];
                //判斷該內容存在mapzhong
                if(map.containsKey(title)){
                    row.createCell(j).setCellValue(map.get(title));
                }
            }
        }
         //設置下載時客戶端Excel的名稱     
        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();     
    }

}

 

在構造函數中傳進來需導出的titles，也就是excel中的標題頭，這個邏輯會有點麻煩，因為我是創建Map，讓dao中查出來的數據根據我的Map（‘title’,'value'）進行封裝，且title要存在於傳進來的titles中，剩下看源碼就能明白

3、service中的數據封裝

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("編號", assetInlibrary.getId()+"");
            map.put("資產名稱", assetInlibrary.getTitle());
            AssetType assetType = assetTypeMapper.selectByPrimaryKey(assetInlibrary.getAssetTypeId());
            map.put("資產類型", assetType.getTitle());
            AssetBrand assetBrand = assetBrandMapper.selectByPrimaryKey(assetInlibrary.getAssetBrandId());
            map.put("資產品牌", assetBrand.getTitle());
            AssetStorage assetStorage = assetStorageMapper.selectByPrimaryKey(assetInlibrary.getAssetStorageId());
            map.put("資產存放地點", assetStorage.getTitle());
            AssetProvider assetProvider = assetProviderMapper.selectByPrimaryKey(assetInlibrary.getAssetProviderId());
            map.put("資產供應商", assetProvider.getTitle());
            mapList.add(map);
        }
        return mapList;
    }

 

4、controller中的數據交互

@RequestMapping("/assetInLibrary/export")
    public ModelAndView export(ModelMap map) throws Exception{
        List<Map<String,String>> list = assetInLibraryService.selectAllAssetInlibraryInfo();
        String[] titles={"編號","資產名稱","資產類型","資產品牌","資產存放地點","資產供應商"};
        ViewExcel excel=new ViewExcel(titles);
        map.put("excelList", list);
        return new ModelAndView(excel,map);
    }

 

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