POI-导入jar包
Apache POI是Apache软件基金会的开放源码函式库，POI提供API给Java程序对Microsoft Office格式档案读和写的功能。
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
这里使用的版本是3.14。自行选择适合自己的版本。
POI-导入功能
工具类的编写，来源于网上大佬，找不到出处了……
这里是文件上传时，立马可以解析导入的数据。参数使用的是MultipartFile。
package com.study.utils;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;
/*excel读写工具类 */
public class POIUtil {
private static Logger logger = LoggerFactory.getLogger(POIUtil.class);
private final static String xls = "xls";
private final static String xlsx = "xlsx";
/**
* 读入excel文件，解析后返回
*
* @param file
* @throws IOException
*/
public static List<String[]> readExcel(MultipartFile file) throws IOException {
//检查文件
//checkFile(file);
//获得Workbook工作薄对象
Workbook workbook = getWorkBook(file);
//创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
List<String[]> list = new ArrayList<String[]>();
if (workbook != null) {
for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
//获得当前sheet工作表
Sheet sheet = workbook.getSheetAt(sheetNum);
if (sheet == null) {
continue;
}
//获得当前sheet的开始行
int firstRowNum = sheet.getFirstRowNum();
//获得当前sheet的结束行
int lastRowNum = sheet.getLastRowNum();
//循环除了第一行的所有行
for (int rowNum = firstRowNum + 1; rowNum <= lastRowNum; rowNum++) {
//获得当前行
Row row = sheet.getRow(rowNum);
if (row == null) {
continue;
}
//获得当前行的开始列
int firstCellNum = row.getFirstCellNum();
//获得当前行的列数
//int lastCellNum = row.getPhysicalNumberOfCells();
//String[] cells = new String[row.getPhysicalNumberOfCells()];
//上面的获取方法,遇到空单元格就会自动停止解析!
int lastCellNum = row.getLastCellNum();
String[] cells = new String[row.getLastCellNum()];
//循环当前行
for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
Cell cell = row.getCell(cellNum);
cells[cellNum] = getCellValue(cell);
}
list.add(cells);
}
}
workbook.close();
}
return list;
}
public static void checkFile(MultipartFile file) throws IOException {
//判断文件是否存在
if (null == file) {
logger.error("文件不存在！");
throw new FileNotFoundException("文件不存在！");
}
//获得文件名
String fileName = file.getOriginalFilename();
//判断文件是否是excel文件
if (!fileName.endsWith(xls) && !fileName.endsWith(xlsx)) {
logger.error(fileName + "不是excel文件");
throw new IOException(fileName + "不是excel文件");
}
}
public static Workbook getWorkBook(MultipartFile file) {
//获得文件名
String fileName = file.getOriginalFilename();
//创建Workbook工作薄对象，表示整个excel
Workbook workbook = null;
try {
//获取excel文件的io流
InputStream is = file.getInputStream();
//根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
if (fileName.endsWith(xls)) {
//2003
workbook = new HSSFWorkbook(is);
} else if (fileName.endsWith(xlsx)) {
//2007
workbook = new XSSFWorkbook(is);
}
} catch (IOException e) {
logger.info(e.getMessage());
}
return workbook;
}
public static String getCellValue(Cell cell) {
String cellValue = "";
if (cell == null) {
return cellValue;
}
//把数字当成String来读，避免出现1读成1.0的情况
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判断数据的类型
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC: //数字
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING: //字符串
cellValue = String.valueOf(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN: //Boolean
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA: //公式
cellValue = String.valueOf(cell.getCellFormula());
break;
case Cell.CELL_TYPE_BLANK: //空值
cellValue = "";
break;
case Cell.CELL_TYPE_ERROR: //故障
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
return cellValue;
}
}
POI-导出功能
这里是直接写在具体的controller层中，如果有需要可以封装一个util工具类。
@SuppressWarnings("resource")是用来压制资源泄露警告的。比如使用io类，最后没有关闭。
@SuppressWarnings("resource")
@RequestMapping("/export.do")
public void exportExcel(HttpServletResponse response, HttpSession session, String name) throws Exception {
Map<Integer, String> categoryMap = MemberCategoryTagDic.getMap();
List<Manager> managerList = managerService.getListByParams(1, ManagerRoleDic.SELLER.getValue(), 1, 100);
Map<Integer, String> managerNameMap = new HashMap<Integer, String>();
for (int i = 0; i < managerList.size(); i++) {
Manager manager = managerList.get(i);
managerNameMap.put(manager.getId(), manager.getRealName());
}
//获取前1000条数据-待定
List<PotentialCustomer> customers = potentialCustomerService.getListByParams(null, null, null, null, 1000);
String[] tableHeaders = {"时间", "所属销售", "客户类型", "公司名称", "主营产品", "联系人", "电话", "跟进情况"};
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Sheet1");
//单元格样式设置
HSSFCellStyle cellStyle = workbook.createCellStyle();
//设置边框
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);//下边框
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
//设置居中
cellStyle.setAlignment(HorizontalAlignment.CENTER);//设置居中
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
//设置单元格内容格式为文本格式
HSSFDataFormat format = workbook.createDataFormat();
cellStyle.setDataFormat(format.getFormat("@"));
//字体设置
Font font = workbook.createFont();
//font.setColor(HSSFColor.RED.index);
font.setBold(true);
//font.setItalic(true);
//font.setUnderline(HSSFFont.U_SINGLE);
//设置单元格内容字体
cellStyle.setFont(font);
// 将第一行的八个单元格给合并
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 7));
HSSFRow row = sheet.createRow(0);
HSSFCell beginCell = row.createCell(0);
beginCell.setCellValue("意向客户累积表");
// 设置第一行单元格样式
beginCell.setCellStyle(cellStyle);
row = sheet.createRow(1);
// 创建表头
for (int i = 0; i < tableHeaders.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellValue(tableHeaders[i]);
cell.setCellStyle(cellStyle);
}
for (int i = 0; i < customers.size(); i++) {
row = sheet.createRow(i + 2);
PotentialCustomer customer = customers.get(i);
row.createCell(0).setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(customer.getCreateTime()));
row.createCell(1).setCellValue(managerNameMap.get(customer.getOwner()));
row.createCell(2).setCellValue(categoryMap.get(customer.getType()));
row.createCell(3).setCellValue(customer.getCompany());
row.createCell(4).setCellValue(customer.getMainProduct());
row.createCell(5).setCellValue(customer.getUsername());
row.createCell(6).setCellValue(customer.getMobile());
row.createCell(7).setCellValue(customer.getMark());
}
OutputStream outputStream = response.getOutputStream();
response.reset();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename=template.xls");
workbook.write(outputStream);
outputStream.flush();
outputStream.close();
}