
方案1:以MYSQL为例存储,表中存文件的字段用blob类型(二进制大文件),利用JDBC或orm框架存入。
方案2:将文件上传至指定的目录,数据库只存储文件的路径,表中建立字段,只保存文件的路径(相对路径),利用JDBC或orm框架存入。推荐使用第二种方式
一) 其实这个功能在spring2.x时代就提供了。一直没用过,今天在spring-mvc3.2.x的环境下试验了一次。还算简单易用。
二) 依赖。
spring依赖POI或jExcel来实现对excel输出的支持,前者是apache出品,貌似名气更大,本例使用第一个。
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.7</version>
</dependency>
三) spring提供了一个AbstractExcelView作为自己实现的视图的父类。实例代码如下。
package ying.car.view
import java.text.DateFormat
import java.text.SimpleDateFormat
import java.util.List
import java.util.Map
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse
import org.apache.poi.hssf.usermodel.HSSFDataFormat
import org.apache.poi.hssf.usermodel.HSSFSheet
import org.apache.poi.hssf.usermodel.HSSFWorkbook
import org.apache.poi.ss.usermodel.Cell
import org.apache.poi.ss.usermodel.CellStyle
import org.apache.poi.ss.usermodel.IndexedColors
import org.joda.time.DateTime
import org.slf4j.Logger
import org.slf4j.LoggerFactory
import org.springframework.web.servlet.view.document.AbstractExcelView
import ying.car.binding.DateRange
import ying.car.domain.RefuelingRecord
public class RefuelingRecordExcelView extends AbstractExcelView {
private static final Logger LOGGER = LoggerFactory.getLogger(RefuelingRecordExcelView.class)
private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyyMMdd")
@Override
@SuppressWarnings({"unchecked"})
protected void buildExcelDocument(
Map<String, Object> model, // MVC中的M就在这里了
HSSFWorkbook workbook,
HttpServletRequest request,
HttpServletResponse response) throws Exception
{
("yyyy/MM/dd"))
LOGGER.debug("end: {}", new DateTime(dr.getEnd()).toString("yyyy/MM/dd"))
}
}
HSSFSheet sheet = workbook.createSheet(DATE_FORMAT.format(dr.getStart()) + "-" + DATE_FORMAT.format(dr.getEnd()))
setColumnsWidth(sheet)
fillTableHeader(workbook, sheet)
fillTableBody(workbook, sheet, rrl)
}
private void setColumnsWidth(HSSFSheet sheet) {
final int[] warr = new int[] {
500, // <空>
4500, // 日期
4500, // 车辆
4500, // 燃油种类
4500, // 燃油单价
4500, // 加油方式
4500, // 加油量
3000, // 花费
12000 // 备注
}
for (int i = 0 i < warr.length i ++) {
sheet.setColumnWidth(i, warr[i])
}
}
// 填充表格头
private void fillTableHeader(HSSFWorkbook workbook, HSSFSheet sheet) {
final String[] contents = new String[] {
"日期",
"车辆",
"燃油种类",
"燃油单价(元/升)",
"加油方式",
"加油量(升)",
"花费(元)",
"备注"
}
int r = 1
int c = 1
CellStyle style = workbook.createCellStyle()
style.setFillForegroundColor(IndexedColors.YELLOW.getIndex()) // 填充黄色
style.setFillPattern(CellStyle.SOLID_FOREGROUND) // 填充方式
// 设置border
style.setBorderLeft(CellStyle.BORDER_THIN)
style.setBorderRight(CellStyle.BORDER_THIN)
style.setBorderTop(CellStyle.BORDER_THIN)
style.setBorderBottom(CellStyle.BORDER_THIN)
for (int i = 0 i < contents.length i ++) {
Cell cell = getCell(sheet, r, c + i)
cell.setCellValue(contents[i])
cell.setCellStyle(style)
}
}
private void fillTableBody(HSSFWorkbook workbook, HSSFSheet sheet, List<RefuelingRecord> records) {
// 通用style
CellStyle style = workbook.createCellStyle()
style.setFillForegroundColor(IndexedColors.WHITE.getIndex()) // 填充白色
style.setFillPattern(CellStyle.SOLID_FOREGROUND) // 填充方式
style.setBorderLeft(CellStyle.BORDER_THIN)
style.setBorderRight(CellStyle.BORDER_THIN)
style.setBorderTop(CellStyle.BORDER_THIN)
style.setBorderBottom(CellStyle.BORDER_THIN)
// 日期style
CellStyle dateStyle = workbook.createCellStyle()
dateStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex()) // 填充白色
dateStyle.setFillPattern(CellStyle.SOLID_FOREGROUND) // 填充方式
dateStyle.setBorderLeft(CellStyle.BORDER_THIN)
dateStyle.setBorderRight(CellStyle.BORDER_THIN)
dateStyle.setBorderTop(CellStyle.BORDER_THIN)
dateStyle.setBorderBottom(CellStyle.BORDER_THIN)
dateStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy"))
int r = 2
int c = 1
Cell cell = null
for (int i = 0 i < records.size() i ++) {
RefuelingRecord rr = records.get(i)
// 日期
cell = getCell(sheet, r, c + 0)
if (rr.getDate() != null)
cell.setCellValue(rr.getDate())
cell.setCellStyle(dateStyle)
// 车辆
cell = getCell(sheet, r, c + 1)
if (rr.getVehicle().getNickname() != null)
cell.setCellValue(rr.getVehicle().getNickname())
cell.setCellStyle(style)
// 燃油种类
cell = getCell(sheet, r, c + 2)
if (rr.getGasType() != null) {
String s = null
switch (rr.getGasType()) {
case _0: s = "0号柴油" break
case _93: s = "93号汽油" break
case _97: s = "97号汽油" break
case _98: s = "98号汽油" break
}
cell.setCellValue(s)
}
cell.setCellStyle(style)
// 单价
cell = getCell(sheet, r, c + 3)
if (rr.getPriceOfGas() != null)
cell.setCellValue(rr.getPriceOfGas())
cell.setCellStyle(style)
// 加油方式
cell = getCell(sheet, r, c + 4)
if (rr.getRefuelingType() != null) {
String s = null
switch (rr.getRefuelingType()) {
case FIXED_CUBAGE:
s = "固定容积" break
case FIXED_MONEY:
s = "固定金额" break
case FULL:
s = "加满" break
}
cell.setCellValue(s)
}
cell.setCellStyle(style)
// 加油量
cell = getCell(sheet, r, c + 5)
if (rr.getCubageOfGas() != null)
cell.setCellValue(rr.getCubageOfGas())
cell.setCellStyle(style)
// 花费
cell = getCell(sheet, r, c + 6)
if (rr.getSumOfMoney() != null)
cell.setCellValue(rr.getSumOfMoney())
cell.setCellStyle(style)
// 备注
cell = getCell(sheet, r, c + 7)
if (rr.getComment() != null)
cell.setCellValue(rr.getComment())
cell.setCellStyle(style)
r ++
}
}
}
cell.setCellStyle(style)
// 燃油种类
cell = getCell(sheet, r, c + 2)
if (rr.getGasType() != null) {
String s = null
switch (rr.getGasType()) {
case _0: s = "0号柴油"break
case _93: s = "93号汽油"break
case _97: s = "97号汽油"break
case _98: s = "98号汽油"break
}
cell.setCellValue(s)
}
cell.setCellStyle(style)
// 单价
cell = getCell(sheet, r, c + 3)
if (rr.getPriceOfGas() != null)
cell.setCellValue(rr.getPriceOfGas())
cell.setCellStyle(style)
// 加油方式
cell = getCell(sheet, r, c + 4)
if (rr.getRefuelingType() != null) {
String s = null
switch (rr.getRefuelingType()) {
case FIXED_CUBAGE:
s = "固定容积"break
case FIXED_MONEY:
s = "固定金额"break
case FULL:
s = "加满"break
}
cell.setCellValue(s)
}
cell.setCellStyle(style)
// 加油量
cell = getCell(sheet, r, c + 5)
if (rr.getCubageOfGas() != null)
cell.setCellValue(rr.getCubageOfGas())
cell.setCellStyle(style)
// 花费
cell = getCell(sheet, r, c + 6)
if (rr.getSumOfMoney() != null)
cell.setCellValue(rr.getSumOfMoney())
cell.setCellStyle(style)
// 备注
cell = getCell(sheet, r, c + 7)
if (rr.getComment() != null)
cell.setCellValue(rr.getComment())
cell.setCellStyle(style)
r ++
}
}
}
四) Controller中返回逻辑视图名 (代码片段)
Java代码
@RequiresUser // 安全框架用元注释
@RequiresRoles({"ROLE_USER"})
@RequestMapping(value = "/list/excel", method = RequestMethod.GET)
public String listByExcel(
@DateRangeFormat(pattern = "yyyy-MM-dd") @RequestParam("dateRange") DateRange dateRange,
ModelMap modelMap
)
{
}
// 放入model
modelMap.put("dateRange", dateRange)
modelMap.put("refuelingRecordList", gasService.findRefuelingRecordByDateRange(currentUserId, dateRange))
return "refueling-record-list" // 最终返回逻辑视图名
}
五) 为spring-mvc配置多个视图解析器。
<bean class="org.springframework.web.servlet.view.XmlViewResolver">
<property name="order" value="1" /> <!-- order很重要 -->
<property name="location" value="classpath:/META-INF/views.xml" />
</bean>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="order" value="9999" />
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
六) 效果图
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