采用Spring mvc架构：
Controller层代码如下
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@Controller
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public class StudentExportController{
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@Autowired
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private StudentExportService studentExportService;
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@RequestMapping(value = "/excel/export")
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public void exportExcel(HttpServletRequest request, HttpServletResponse response)
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throws Exception {
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List<Student> list = new ArrayList<Student>();
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list.add(new Student(1000,"zhangsan","20"));
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list.add(new Student(1001,"lisi","23"));
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list.add(new Student(1002,"wangwu","25"));
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HSSFWorkbook wb = studentExportService.export(list);
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response.setContentType("application/vnd.ms-excel");
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response.setHeader("Content-disposition", "attachment;filename=student.xls");
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OutputStream ouputStream = response.getOutputStream();
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wb.write(ouputStream);
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ouputStream.flush();
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ouputStream.close();
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}
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}
Service层代码如下：
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@Service
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public class StudentExportService {
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String[] excelHeader = { "Sno", "Name", "Age"};
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public HSSFWorkbook export(List<Campaign> list) {
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HSSFWorkbook wb = new HSSFWorkbook();
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HSSFSheet sheet = wb.createSheet("Campaign");
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HSSFRow row = sheet.createRow((int) 0);
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HSSFCellStyle style = wb.createCellStyle();
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style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
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for (int i = 0; i < excelHeader.length; i++) {
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HSSFCell cell = row.createCell(i);
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cell.setCellValue(excelHeader[i]);
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cell.setCellStyle(style);
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sheet.autoSizeColumn(i);
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}
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for (int i = 0; i < list.size(); i++) {
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row = sheet.createRow(i + 1);
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Student student = list.get(i);
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row.createCell(0).setCellValue(student.getSno());
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row.createCell(1).setCellValue(student.getName());
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row.createCell(2).setCellValue(student.getAge());
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}
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return wb;
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}
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}
前台的js代码如下：
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<script>
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function exportExcel(){
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location.href="excel/export";
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<!--这里不能用ajax请求，ajax请求无法弹出下载保存对话框-->
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}
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</script>
设置Excel样式以及注意点：
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String[] excelHeader = { "所属区域（地市）", "机房", "机架资源情况", "", "", "", "",
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"", "端口资源情况", "", "", "", "", "", "机位资源情况", "", "", "设备资源情况",
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"", "", "IP资源情况", "", "", "", "", "网络设备数" };
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String[] excelHeader1 = { "", "", "总量(个)", "空闲(个)", "预占(个)", "实占(个)",
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"自用(个)", "其它(个)", "总量(个) ", "在用(个)", "空闲(个)", "总带宽(M)",
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"在用带宽(M)", "空闲带宽(M)", "总量(个)", "在用(个)", "空闲(个)", "设备总量(个)",
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"客户设备(个)", "电信设备(个)", "总量(个)", "空闲(个)", "预占用(个)", "实占用(个)",
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"自用(个)", "" };
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int[] excelHeaderWidth = { 150, 120, 100, 100, 100, 100, 100, 100, 100,
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100, 100, 120, 120, 120, 120, 120, 120, 150, 150, 150, 120,
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120, 150, 150, 120, 150 };
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HSSFWorkbook wb = new HSSFWorkbook();
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HSSFSheet sheet = wb.createSheet("机房报表统计");
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HSSFRow row = sheet.createRow((int) 0);
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HSSFCellStyle style = wb.createCellStyle();
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style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
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style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
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HSSFCellStyle style1 = wb.createCellStyle();
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Font font = wb.createFont();
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font.setColor(HSSFColor.RED.index);
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font.setBoldweight(Font.BOLDWEIGHT_BOLD);
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style1.setFont(font);
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style1.setAlignment(HSSFCellStyle.ALIGN_CENTER);
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style1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
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sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 0));
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sheet.addMergedRegion(new CellRangeAddress(0, 1, 1, 1));
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sheet.addMergedRegion(new CellRangeAddress(0, 0, 2, 7));
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sheet.addMergedRegion(new CellRangeAddress(0, 0, 8, 13));
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sheet.addMergedRegion(new CellRangeAddress(0, 0, 14, 16));
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sheet.addMergedRegion(new CellRangeAddress(0, 0, 17, 19));
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sheet.addMergedRegion(new CellRangeAddress(0, 0, 20, 24));
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sheet.addMergedRegion(new CellRangeAddress(0, 1, 25, 25));
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for (int i = 0; i < excelHeaderWidth.length; i++) {
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sheet.setColumnWidth(i, 32 * excelHeaderWidth[i]);
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}
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for (int i = 0; i < excelHeader.length; i++) {
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HSSFCell cell = row.createCell(i);
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cell.setCellValue(excelHeader[i]);
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cell.setCellStyle(style);
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}
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row = sheet.createRow((int) 1);
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for (int i = 0; i < excelHeader1.length; i++) {
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HSSFCell cell = row.createCell(i);
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cell.setCellValue(excelHeader1[i]);
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cell.setCellStyle(style);
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}
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
Excel导出学习之道：Java Web利用POI导出Excel简单例子,布布扣,bubuko.com
Excel导出学习之道：Java Web利用POI导出Excel简单例子
原文：http://blog.csdn.net/u011511429/article/details/38487271
