java中的接口是类吗
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2023-06-08
基于Spring Mvc实现的Excel文件上传下载示例
最近工作遇到一个需求,需要下载excel模板,编辑后上传解析存储到数据库。因此为了更好的理解公司框架,我就自己先用spring mvc实现了一个样例。
基础框架
之前曾经介绍过一个最简单的spring mvc的项目如何搭建,传送门在这里。
这次就基于这个工程,继续实现上传下载的小例子。需要做下面的事情:
1 增加index.html,添加form提交文件
2 引入commons-fileupload、commons-io、jxl等工具包
3 创建upload download接口
4 注入multipartResolver bean
5 在upload中使用HttpServletRequest获取文件流,通过WorkBook进行解析
6 在download中通过HttpServerResponse返回文件流,实现下载
页面
页面很简单,其实就是一个form标签,需要注意的是:
form中enctype="multipart/form-data"
action指定访问的url
input中需要设置name属性,这样后端才能获取到文件对象
引入commons-fileupload、jxl等工具包
涉及的jar包有:
commons-fileupload 用于获取上传文件
jxl 用于解析excel
Xml的配置
在web.xml中需要配置默认的访问页面,因为之前已经设置过拦截的请求是/,因此如果不设置所有的静态页面都会被拦截下来。
在spring的配置文件中,加入CommonsMultipartResolver的bean。
上传代码
@RequestMapping("upload")
public void upload(HttpServletRequest request, HttpServletResponse response) throws IOException, BiffException, WriteException {
MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
MultipartFile file = mRequest.getFile("file");
Workbook workbook = Workbook.getWorkbook(file.getInputStream());
//遍历Sheet页
Arrays.stream(workbook.getSheets())
.forEach(sheet -> {
int size = sheet.getRows();
for(int i=0; i //遍历每一行,读取每列信息 Arrays.stream(sheet.getRow(i)).forEach(cell -> System.out.println(cell.getContents().equals("")?'空':cell.getContents())); } }); response.setHeader("Content-Disposition", "attachment; filename=return.xls"); WritableWorkbook writableWorkbook = ExcelUtils.createTemplate(response.getOutputStream()); writableWorkbook.write(); writableWorkbook.close(); } 下载代码 @RequestMapping("download") public void download(HttpServletRequest request, HttpServletResponse response) throws IOException, BiffException, WriteException { response.setHeader("Content-Disposition", "attachment; filename=template.xls"); WritableWorkbook writableWorkbook = ExcelUtils.createTemplate(response.getOutputStream()); writableWorkbook.write(); writableWorkbook.close(); } 模板类 static class ExcelUtils { public static WritableWorkbook createTemplate(OutputStream output) throws IOException, WriteException { WritableWorkbook writableWorkbook= Workbook.createWorkbook(output); WritableSheet wsheet = writableWorkbook.createSheet("测试title", 0); CellFormat cf = writableWorkbook.getSheet(0).getCell(1, 0).getCellFormat(); WritableCellFormat wc = new WritableCellFormat(); // 设置居中 wc.setAlignment(Alignment.CENTRE); // 设置边框线 // wc.setBorder(Border.ALL, BorderLineStyle.THIN); wc.setBackground(jxl.format.Colour.GREEN); Label nc0 = new Label(0, 0, "标题1",wc);//Label(x,y,z)其中x代表单元格的第x+1列,第y+1行, 单元格的内容是z Label nc1 = new Label(1, 0, "标题2",wc); Label nc2 = new Label(2, 0, "标题3",wc); Label nc3 = new Label(0, 1, "dddd"); Label nc4 = new Label(1, 1, "ffff"); wsheet.addCell(nc0); wsheet.addCell(nc1); wsheet.addCell(nc2); wsheet.addCell(nc3); wsheet.ahttp://ddCell(nc4); return writableWorkbook; } } 最后贡献下相关的代码:SpringTest_jb51.rar
//遍历每一行,读取每列信息
Arrays.stream(sheet.getRow(i)).forEach(cell -> System.out.println(cell.getContents().equals("")?'空':cell.getContents()));
}
});
response.setHeader("Content-Disposition", "attachment; filename=return.xls");
WritableWorkbook writableWorkbook = ExcelUtils.createTemplate(response.getOutputStream());
writableWorkbook.write();
writableWorkbook.close();
}
下载代码
@RequestMapping("download")
public void download(HttpServletRequest request, HttpServletResponse response) throws IOException, BiffException, WriteException {
response.setHeader("Content-Disposition", "attachment; filename=template.xls");
WritableWorkbook writableWorkbook = ExcelUtils.createTemplate(response.getOutputStream());
writableWorkbook.write();
writableWorkbook.close();
}
模板类
static class ExcelUtils {
public static WritableWorkbook createTemplate(OutputStream output) throws IOException, WriteException {
WritableWorkbook writableWorkbook= Workbook.createWorkbook(output);
WritableSheet wsheet = writableWorkbook.createSheet("测试title", 0);
CellFormat cf = writableWorkbook.getSheet(0).getCell(1, 0).getCellFormat();
WritableCellFormat wc = new WritableCellFormat();
// 设置居中
wc.setAlignment(Alignment.CENTRE);
// 设置边框线
// wc.setBorder(Border.ALL, BorderLineStyle.THIN);
wc.setBackground(jxl.format.Colour.GREEN);
Label nc0 = new Label(0, 0, "标题1",wc);//Label(x,y,z)其中x代表单元格的第x+1列,第y+1行, 单元格的内容是z
Label nc1 = new Label(1, 0, "标题2",wc);
Label nc2 = new Label(2, 0, "标题3",wc);
Label nc3 = new Label(0, 1, "dddd");
Label nc4 = new Label(1, 1, "ffff");
wsheet.addCell(nc0);
wsheet.addCell(nc1);
wsheet.addCell(nc2);
wsheet.addCell(nc3);
wsheet.ahttp://ddCell(nc4);
return writableWorkbook;
}
}
最后贡献下相关的代码:SpringTest_jb51.rar
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