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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