Spring3 MVC的最佳实践和理解（9）

个人学习参考所用，勿喷！

9.创建一个资源多种实现的Excel和PDF视图

这里一个用于生成特定日期的预订消息的摘要报告的控制器为类：

@Controller
@RequestMapping("/reservationSummary*")
public class ReservationSummaryController {
    private ReservationService reservationService;

    @Autowired
    public ReservationSummaryController(ReservationService reservationService) {
        this.reservationService = reservationService;
    }
	
    @RequestMapping(method = RequestMethod.GET)
	public String generateSummary(
	   @RequestParam(required = true, value = "date") String selectedDate, Model model) { 
	   List<Reservation> reservations = java.util.Collections.emptyList();
	try { 
	    Date summaryDate = new SimpleDateFormat("yyyy-MM-dd").parse(selectedDate);
	    reservations = reservationService.findByDate(summaryDate);
	} catch (java.text.ParseException ex) { 
	    StringWriter sw = new StringWriter();
	    PrintWriter pw = new PrintWriter(sw);
	    ex.printStackTrace(pw); 
	    throw new ReservationWebException("Invalid date format for reservation summary",new Date(),sw.toString());
	}
	model.addAttribute("reservations",reservations);		
	
	return "reservationSummary";
    }
}

从上面代码可以明确的看出返回的是同一的逻辑视图"reservationSummary"。

9.1）创建Excel视图。

这里需要添加Apache POI程序库的支持：

<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi</artifactId>
	<version>3.5-FINAL</version>
	<type>jar</type>
	<scope>compile</scope>
</dependency>

创建Excel视图的处理类：

public class ExcelReservationSummary extends AbstractExcelView {

    @SuppressWarnings({ "rawtypes", "unchecked", "deprecation" })
	protected void buildExcelDocument(Map model, HSSFWorkbook workbook,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        List<Reservation> reservations = (List) model.get("reservations");
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        HSSFSheet sheet = workbook.createSheet();

        HSSFRow header = sheet.createRow(0);
        header.createCell((short) 0).setCellValue("Court Name");
        header.createCell((short) 1).setCellValue("Date");
        header.createCell((short) 2).setCellValue("Hour");
        header.createCell((short) 3).setCellValue("Player Name");
        header.createCell((short) 4).setCellValue("Player Phone");

        int rowNum = 1;
        for (Reservation reservation : reservations) {
            HSSFRow row = sheet.createRow(rowNum++);
            row.createCell((short) 0).setCellValue(reservation.getCourtName());
            row.createCell((short) 1).setCellValue(
                    dateFormat.format(reservation.getDate()));
            row.createCell((short) 2).setCellValue(reservation.getHour());
            row.createCell((short) 3).setCellValue(
                    reservation.getPlayer().getName());
            row.createCell((short) 4).setCellValue(
                    reservation.getPlayer().getPhone());
        }
    }
}

这里我们还需要在资源集文件中添加对Excel资源的处理方式（当然也可以以其它的方式进行注册，只需要完成逻辑视图和视图对象的映射即可）：

reservationSummary.(class)=com.apress.springrecipes.court.web.view.ExcelReservationSummary

这里我们可以用http://localhost:7070/Spring3MVC/reservationSummary.xls?date=2011-07-31的方式来获取到需要excel视图资源，当然这个资源是下载到本地了的。

9.2）创建PDF视图。

这里需要添加iText程序库的支持：

<dependency>
	<groupId>com.lowagie</groupId>
	<artifactId>itext</artifactId>
	<version>2.1.7</version>
	<type>jar</type>
	<scope>compile</scope>
</dependency>

创建PDF视图处理类：

public class PdfReservationSummary extends AbstractPdfView {

    @SuppressWarnings({ "rawtypes", "unchecked" })
	protected void buildPdfDocument(Map model, Document document,
            PdfWriter writer, HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        List<Reservation> reservations = 
	    (List<Reservation>) model.get("reservations");
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Table table = new Table(5);

        table.addCell("Court Name");
        table.addCell("Date");
        table.addCell("Hour");
        table.addCell("Player Name");
        table.addCell("Player Phone");
	
	if(!reservations.isEmpty()) { 
	    for (Reservation reservation : reservations) {
		table.addCell(reservation.getCourtName());
		table.addCell(dateFormat.format(reservation.getDate()));
		table.addCell(Integer.toString(reservation.getHour()));
		table.addCell(reservation.getPlayer().getName());
		table.addCell(reservation.getPlayer().getPhone());
	    }
	}

        document.add(table);
    }
}

这里我们还需要在资源集文件中添加对pdf资源的处理方式，并且不能和上面的Excel映射添加到同一个资源集中，因为同一个资源集中不能处在对相同的键值：

reservationSummary.(class)=com.apress.springrecipes.court.web.view.ExcelReservationSummary

这里我们可以用http://localhost:7070/Spring3MVC/reservationSummary.pdf?date=2011-07-31的方式来获取到需要pdf视图资源，当然这个资源是下载到本地了的。

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附件为系列文章的示例代码，eclipse3.7.1中运行通过。

参考：

juyon的blog:《spring3 MVC国际化支持之中文乱码》

Gary Mark等的书籍：《Spring Recipes》2ed

Spring3 MVC的最佳实践和理解（9）

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