javaweb 利用POI生成excel报表 相关代码

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

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