Java 将Mysql数据库的数据导出到excel文件

/**
* 将已选题信息导出为Excel文档
*
* @param mapping
* @param form
* @param request
* @param response
* @return
* @throws Exception
*/
public ActionForward exExcel(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {

Integer cid = Integer.valueOf(request.getParameter("cid"));
College col = collegeDao.findByID(cid);
List<Choices> list = choicesDao.findByCIDCho(col);
String filename = list.get(0).getStudent().getGrade().getGname() + "级"
+ col.getCname();

response.setContentType("text/html;charset=GBK");
response.setContentType("application/xml");
response.setHeader("Content-Disposition", "attachment;filename="
+ new String(filename.getBytes(), "iso-8859-1") + ".xls");

HSSFWorkbook workBook = new HSSFWorkbook(); // 创建 一个excel文档对象
HSSFSheet sheet = workBook.createSheet(); // 创建一个工作薄对象
HSSFCell cell = null; // 声明单元格对象

sheet.setColumnWidth(0, 4000);
sheet.setColumnWidth(1, 10000);
sheet.setColumnWidth(2, 4000);
sheet.setColumnWidth(3, 4000);
sheet.setColumnWidth(4, 5000);
sheet.setColumnWidth(5, 5000);
sheet.setColumnWidth(6, 4000);
sheet.setColumnWidth(7, 4000);
sheet.setColumnWidth(8, 5000);
sheet.setColumnWidth(9, 5000);

HSSFCellStyle style = workBook.createCellStyle(); // 创建样式对象
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);// 水平居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中
HSSFFont font = workBook.createFont();// 创建字体对象
font.setFontHeightInPoints((short) 12);
font.setFontName("黑体");// 设置字体
style.setFont(font);

HSSFCellStyle titleStyle = workBook.createCellStyle();// 创建表头样式对象
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);// 水平居中
titleStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中
HSSFFont titleFont = workBook.createFont();// 创建表头字体对象
titleFont.setFontHeightInPoints((short) 15);
titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置粗体
titleFont.setFontName("黑体");// 设置字体
titleStyle.setFont(titleFont);

// 合并单元格操作
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 9));
sheet.addMergedRegion(new CellRangeAddress(2, 2, 0, 9));
cell = sheet.createRow(0).createCell(0);
cell.setCellStyle(titleStyle);
cell.setCellValue(new HSSFRichTextString(list.get(0).getStudent()
.getGrade().getGname()
+ "级" + col.getCname() + "学院"));

HSSFRow row = sheet.createRow(2);
row.setHeightInPoints(20);
cell = row.createCell(0);
cell.setCellStyle(style);
cell.setCellValue(new HSSFRichTextString("毕业设计选题 "
+ " 选题总人数：" + list.size() + " 人"));
// 设置边框样式
HSSFCellStyle tableStyle = workBook.createCellStyle();
tableStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
tableStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);// 水平居中
tableStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中
HSSFFont tableFont = workBook.createFont();// 创建表格字体对象
tableFont.setFontHeightInPoints((short) 11);
tableFont.setFontName("宋体");// 设置字体
tableStyle.setFont(tableFont);

// 生成表头
String[] bt = new String[] { "选题编号", "选题名", "选题学生学号", "选题学生名",
"选题学生电话", "选题学生邮箱", "指导老师编号", "指导老师名", "指导老师电话", "指导老师邮箱" };
HSSFRow tableRow = sheet.createRow(3); // 创建一个行对象
tableRow.setHeightInPoints(18);
for (int i = 0; i < bt.length; i++) {
cell = tableRow.createCell(i);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(bt[i]));
}
// 写入表格内容
for (int i = 0; i < list.size(); i++) {
tableRow = sheet.createRow(i + 4); // 创建一个行对象
tableRow.setHeightInPoints(16);
Choices cho = list.get(i);
cell = tableRow.createCell(0);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getSubject()
.getSub_ID().toString()));
cell = tableRow.createCell(1);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getSubject()
.getSub_name()));
cell = tableRow.createCell(2);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getStudent().getUser()
.getUser_name()));
cell = tableRow.createCell(3);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getStudent()
.getStu_name()));
cell = tableRow.createCell(4);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getStudent()
.getStu_tel()));
cell = tableRow.createCell(5);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getStudent()
.getStu_mail()));
cell = tableRow.createCell(6);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getTeacher().getUser()
.getUser_name()));
cell = tableRow.createCell(7);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getTeacher()
.getTea_name()));
cell = tableRow.createCell(8);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getTeacher()
.getTea_tel()));
cell = tableRow.createCell(9);
cell.setCellStyle(tableStyle);
cell.setCellValue(new HSSFRichTextString(cho.getTeacher()
.getTea_mail()));
}
workBook.write(response.getOutputStream()); // 将文档对象写入文件输出流
return null;
}