本文主要是介绍Java Web利用POI导出Excel例子(采用Spring mvc架构)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
采用Spring mvc架构：Controller层代码如下
- @Controller
- public class StudentExportController{
- @Autowired
- private StudentExportService studentExportService;
- @RequestMapping(value = "/excel/export")
- public void exportExcel(HttpServletRequest request, HttpServletResponse response)
- throws Exception {
- List<Student> list = new ArrayList<Student>();
- list.add(new Student(1000,"zhangsan","20"));
- list.add(new Student(1001,"lisi","23"));
- list.add(new Student(1002,"wangwu","25"));
- HSSFWorkbook wb = studentExportService.export(list);
- response.setContentType("application/vnd.ms-excel");
- response.setHeader("Content-disposition", "attachment;filename=student.xls");
- OutputStream ouputStream = response.getOutputStream();
- wb.write(ouputStream);
- ouputStream.flush();
- ouputStream.close();
- }
- }
Service层代码如下：
- @Service
- public class StudentExportService {
- String[] excelHeader = { "Sno", "Name", "Age"};
- public HSSFWorkbook export(List<Campaign> list) {
- HSSFWorkbook wb = new HSSFWorkbook();
- HSSFSheet sheet = wb.createSheet("Campaign");
- HSSFRow row = sheet.createRow((int) 0);
- HSSFCellStyle style = wb.createCellStyle();
- style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
- for (int i = 0; i < excelHeader.length; i++) {
- HSSFCell cell = row.createCell(i);
- cell.setCellValue(excelHeader[i]);
- cell.setCellStyle(style);
- sheet.autoSizeColumn(i);
- }
- for (int i = 0; i < list.size(); i++) {
- row = sheet.createRow(i + 1);
- Student student = list.get(i);
- row.createCell(0).setCellValue(student.getSno());
- row.createCell(1).setCellValue(student.getName());
- row.createCell(2).setCellValue(student.getAge());
- }
- return wb;
- }
- }
前台的js代码如下：
- <script>
- function exportExcel(){
- location.href="excel/export";
- <!--这里不能用ajax请求，ajax请求无法弹出下载保存对话框-->
- }
- </script>
设置Excel样式以及注意点：
- String[] excelHeader = { "所属区域（地市）", "机房", "机架资源情况", "", "", "", "",
- "", "端口资源情况", "", "", "", "", "", "机位资源情况", "", "", "设备资源情况",
- "", "", "IP资源情况", "", "", "", "", "网络设备数" };
- String[] excelHeader1 = { "", "", "总量(个)", "空闲(个)", "预占(个)", "实占(个)",
- "自用(个)", "其它(个)", "总量(个) ", "在用(个)", "空闲(个)", "总带宽(M)",
- "在用带宽(M)", "空闲带宽(M)", "总量(个)", "在用(个)", "空闲(个)", "设备总量(个)",
- "客户设备(个)", "电信设备(个)", "总量(个)", "空闲(个)", "预占用(个)", "实占用(个)",
- "自用(个)", "" };
- // 单元格列宽
- int[] excelHeaderWidth = { 150, 120, 100, 100, 100, 100, 100, 100, 100,
- 100, 100, 120, 120, 120, 120, 120, 120, 150, 150, 150, 120,
- 120, 150, 150, 120, 150 };
- HSSFWorkbook wb = new HSSFWorkbook();
- HSSFSheet sheet = wb.createSheet("机房报表统计");
- HSSFRow row = sheet.createRow((int) 0);
- HSSFCellStyle style = wb.createCellStyle();
- // 设置居中样式
- style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中
- style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中
- // 设置合计样式
- HSSFCellStyle style1 = wb.createCellStyle();
- Font font = wb.createFont();
- font.setColor(HSSFColor.RED.index);
- font.setBoldweight(Font.BOLDWEIGHT_BOLD); // 粗体
- style1.setFont(font);
- style1.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中
- style1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中
- // 合并单元格
- // first row (0-based) last row (0-based) first column (0-based) last
- // column (0-based)
- sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 0));
- sheet.addMergedRegion(new CellRangeAddress(0, 1, 1, 1));
- sheet.addMergedRegion(new CellRangeAddress(0, 0, 2, 7));
- sheet.addMergedRegion(new CellRangeAddress(0, 0, 8, 13));
- sheet.addMergedRegion(new CellRangeAddress(0, 0, 14, 16));
- sheet.addMergedRegion(new CellRangeAddress(0, 0, 17, 19));
- sheet.addMergedRegion(new CellRangeAddress(0, 0, 20, 24));
- sheet.addMergedRegion(new CellRangeAddress(0, 1, 25, 25));
- // 设置列宽度（像素）
- for (int i = 0; i < excelHeaderWidth.length; i++) {
- sheet.setColumnWidth(i, 32 * excelHeaderWidth[i]);
- }
- // 添加表格头
- for (int i = 0; i < excelHeader.length; i++) {
- HSSFCell cell = row.createCell(i);
- cell.setCellValue(excelHeader[i]);
- cell.setCellStyle(style);
- }
- row = sheet.createRow((int) 1);
- for (int i = 0; i < excelHeader1.length; i++) {
- HSSFCell cell = row.createCell(i);
- cell.setCellValue(excelHeader1[i]);
- cell.setCellStyle(style);
- }
注意点1：合并单元格 new CellRangeAddress(int,int,int,int)
first row (0-based) ,last row (0-based), first column (0-based),last column (0-based)
注意点2：合并单元格
String[] excelHeader = { "所属区域（地市）", "机房", "机架资源情况", "", "", "", "","", "端口资源情况", "", "", "", "", "", "机位资源情况", "", "", "设备资源情况","", "", "IP资源情况", "", "", "", "", "网络设备数" };
合并以后的单元格虽然是一个，但是仍然要保留其单元格内容，此处用空字符串代替，否则后续表头显示不出
注意点3：填充单元格
正确写法：
HSSFCell cell = row.createCell(i);
cell.setCellValue(excelHeader1[i]);
cell.setCellStyle(style);
错误写法：
row.createCell(i).setCellValue(excelHeader1[i]);
row.createCell(i).setCellStyle(style);
本人为了省一个HSSFCell对象，使用了错误写法，导致HSSFCell对象创建了2次，最后只保留了样式，而内容无法显示
这篇关于Java Web利用POI导出Excel例子(采用Spring mvc架构)的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
