不用 jsp 如何返回一个页面

【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>>

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();
		}
	}

 

来源：oschina

链接：https://my.oschina.net/u/3631797/blog/3153521