不用jsp如何返回一个页面
答:通过将 文件 内容写出到 ServletOutputStream 中
例如: 在 struts中
Action:
说明:Action中方法的返回值 String 表示要 forward 的jsp页面,若要直接向浏览器写个页面,就直接返回void
//导出用户列表 public void exportExcel(){
try {
//1、查找用户列表
//2、导出
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType("application/x-execl");
response.setHeader("Content-Disposition", "attachment;filename=" + new String("用户列表.xls".getBytes(), "ISO-8859-1"));
ServletOutputStream outputStream = response.getOutputStream();
userService.exportExcel(userService.findObjects(), outputStream);
//流用完之后要关闭
if(outputStream != null){
outputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
UserService 中 exportExcel的实现:
public void exportUserExcel(List<User> userList, ServletOutputStream outputStream) { try {
//1、创建工作簿
HSSFWorkbook workbook = new HSSFWorkbook();
//1.1、创建合并单元格对象
CellRangeAddress cellRangeAddress = new CellRangeAddress(0, 0, 0, 4);//起始行号,结束行号,起始列号,结束列号
//1.2、头标题样式
HSSFCellStyle style1 = createCellStyle(workbook, (short)16);
//1.3、列标题样式
HSSFCellStyle style2 = createCellStyle(workbook, (short)13);
//2、创建工作表
HSSFSheet sheet = workbook.createSheet("用户列表");
//2.1、加载合并单元格对象
sheet.addMergedRegion(cellRangeAddress);
//设置默认列宽
sheet.setDefaultColumnWidth(25);
//3、创建行
//3.1、创建头标题行;并且设置头标题
HSSFRow row1 = sheet.createRow(0);
HSSFCell cell1 = row1.createCell(0);
//加载单元格样式
cell1.setCellStyle(style1);
cell1.setCellValue("用户列表");
//3.2、创建列标题行;并且设置列标题
HSSFRow row2 = sheet.createRow(1);
String[] titles = {"用户名","帐号", "所属部门", "性别", "电子邮箱"};
for(int i = 0; i < titles.length; i++){
HSSFCell cell2 = row2.createCell(i);
//加载单元格样式
cell2.setCellStyle(style2);
cell2.setCellValue(titles[i]);
}
//4、操作单元格;将用户列表写入excel
if(userList != null){
for(int j = 0; j < userList.size(); j++){
HSSFRow row = sheet.createRow(j+2);
HSSFCell cell11 = row.createCell(0);
cell11.setCellValue(userList.get(j).getName());
HSSFCell cell12 = row.createCell(1);
cell12.setCellValue(userList.get(j).getAccount());
HSSFCell cell13 = row.createCell(2);
cell13.setCellValue(userList.get(j).getDept());
HSSFCell cell14 = row.createCell(3);
cell14.setCellValue(userList.get(j).isGender()?"男":"女");
HSSFCell cell15 = row.createCell(4);
cell15.setCellValue(userList.get(j).getEmail());
}
}
//5、输出
workbook.write(outputStream);
workbook.close();
} catch (Exception e) {
e.printStackTrace();
}
}
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