导入POI依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.17</version>
</dependency>Excel导入工具类
import org.apache.commons.lang.time.DateUtils;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.*;
public class ExcelReadUtil<T> {
/**
* 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出
*
* title 表格标题名
* headersName 表格属性列名数组
* headersId 表格属性列名对应的字段---你需要导出的字段名（为了更灵活控制你想要导出的字段）
* dtoList 需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象
* out 与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
*/
public byte[] exportExcel(String title, List<String> headersName,List<String> headersId,
List<T> dtoList) {
/*（一）表头--标题栏*/
Map<Integer, String> headersNameMap = new HashMap<>();
int key=0;
for (int i = 0; i < headersName.size(); i++) {
if (!headersName.get(i).equals(null)) {
headersNameMap.put(key, headersName.get(i));
key++;
}
}
/*（二）字段*/
Map<Integer, String> titleFieldMap = new HashMap<>();
int value = 0;
for (int i = 0; i < headersId.size(); i++) {
if (!headersId.get(i).equals(null)) {
titleFieldMap.put(value, headersId.get(i));
value++;
}
}
/* （三）声明一个工作薄：包括构建工作簿、表格、样式*/
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet(title);
sheet.setDefaultColumnWidth((short)15);
// 生成一个样式
HSSFCellStyle style = wb.createCellStyle();
HSSFRow row = sheet.createRow(0);
// style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
HSSFCell cell;
Collection c = headersNameMap.values();//拿到表格所有标题的value的集合
Iterator<String> it = c.iterator();//表格标题的迭代器
/*（四）导出数据：包括导出标题栏以及内容栏*/
//根据选择的字段生成表头
short size = 0;
while (it.hasNext()) {
cell = row.createCell(size);
cell.setCellValue(it.next().toString());
cell.setCellStyle(style);
size++;
}
//表格标题一行的字段的集合
Collection zdC = titleFieldMap.values();
Iterator<T> labIt = dtoList.iterator();//总记录的迭代器
int zdRow =0;//列序号
while (labIt.hasNext()) {//记录的迭代器，遍历总记录
int zdCell = 0;
zdRow++;
row = sheet.createRow(zdRow);
T l = (T) labIt.next();
// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
Field[] fields = l.getClass().getDeclaredFields();//获得JavaBean全部属性
for (short i = 0; i < fields.length; i++) {//遍历属性，比对
Field field = fields[i];
String fieldName = field.getName();//属性名
Iterator<String> zdIt = zdC.iterator();//一条字段的集合的迭代器
while (zdIt.hasNext()) {//遍历要导出的字段集合
if (zdIt.next().equals(fieldName)) {//比对JavaBean的属性名，一致就写入，不一致就丢弃
String getMethodName = "get"
+ fieldName.substring(0, 1).toUpperCase()
+ fieldName.substring(1);//拿到属性的get方法
Class tCls = l.getClass();//拿到JavaBean对象
try {
Method getMethod = tCls.getMethod(getMethodName,
new Class[] {});//通过JavaBean对象拿到该属性的get方法，从而进行操控
Object val = getMethod.invoke(l, new Object[] {});//操控该对象属性的get方法，从而拿到属性值
String textVal = null;
if (val!= null) {
textVal = String.valueOf(val);//转化成String
}else{
textVal = null;
}
row.createCell((short) zdCell).setCellValue(textVal);//写进excel对象
zdCell++;
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
}
}
return wb.getBytes();
}
/**
* Excel读取 操作
*/
public static List<List<String>> readExcel(InputStream is) throws IOException {
Workbook wb = null;
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
try {
wb = WorkbookFactory.create(is);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (InvalidFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
/** 得到第一个sheet */
Sheet sheet = wb.getSheetAt(0);
/** 得到Excel的行数 */
int totalRows = sheet.getPhysicalNumberOfRows();
/** 得到Excel的列数 */
int totalCells = 0;
if (totalRows >= 1 && sheet.getRow(0) != null) {
totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
}
List<List<String>> dataLst = new ArrayList<List<String>>();
/** 循环Excel的行 */
for (int r = 0; r < totalRows; r++) {
Row row = sheet.getRow(r);
if (row == null) continue;
if (isRowEmpty(row)) continue; //过滤空行
List<String> rowLst = new ArrayList<String>();
/** 循环Excel的列 */
for (int c = 0; c < totalCells; c++) {
Cell cell = row.getCell(c);
String cellValue = "";
if (null != cell) {
/*HSSFDataFormatter hSSFDataFormatter = new HSSFDataFormatter();
cellValue= hSSFDataFormatter.formatCellValue(cell);*/
// 以下是判断数据的类型
CellType type = cell.getCellTypeEnum();
switch (type) {
case NUMERIC: // 数字
cellValue = cell.getNumericCellValue() + "";
//转换时间格式
if (r != 0 && c == 7) {
Date date = dateFormat(cellValue.substring(0, cellValue.length() - 2));
// System.out.println(date);
cellValue = sf.format(date);
}
//校验整数
if (r != 0 && c == 6) {
if (cellValue.contains(".")) {
int i = cellValue.indexOf(".");
cellValue = cellValue.substring(0, i);
}
}
break;
case STRING: // 字符串
cellValue = cell.getStringCellValue();
break;
case BOOLEAN: // Boolean
cellValue = cell.getBooleanCellValue() + "";
break;
case FORMULA: // 公式
try {
cellValue = cell.getStringCellValue();
} catch (IllegalStateException e) {
cellValue = String.valueOf(cell.getNumericCellValue());
}
break;
/* cellValue = cell.getCellFormula() + "";
break;*/
case BLANK: // 空值
cellValue = "";
break;
case _NONE: // 故障
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
}
rowLst.add(cellValue);
}
/** 保存第r行的第c列 */
dataLst.add(rowLst);
}
return dataLst;
}
//时间转换方法 传取出来的时间数字
public static Date dateFormat(String conStart1) {
Calendar calendar = new GregorianCalendar(1900, 0, -1);
Date d = calendar.getTime();
Date dd = DateUtils.addDays(d, Integer.valueOf(conStart1));
return dd;
}
//判断是否空行
private static boolean isRowEmpty(Row row) {
for (int c = row.getFirstCellNum(); c < row.getLastCellNum(); c++) {
Cell cell = row.getCell(c);
if (cell != null && cell.getCellType() != Cell.CELL_TYPE_BLANK)
return false;
}
return true;
}
}调用例子
/**
* excel数据 批量插入
*
* @param file
* @param cusId
* @return
*/
@RequestMapping("/addBatchDevice")
@ResponseBody
@CrossOrigin
public ObjectRestResponse addBatchDevice(MultipartFile file, @RequestParam String cusId) {
ObjectRestResponse response = new ObjectRestResponse();
int i = 0;
try {
//读取excel表格
List<List<String>> lists = ExcelUtil.readExcel(file.getInputStream());
// System.out.println(lists);
i = mangeService.addBatchFarmDevice(lists, cusId);
response.setData(i);
} catch (IOException e) {
e.printStackTrace();
}
return response;
}导出工具类（xls方式和xlsx方式）
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
public class ExcelExport {
private static final Logger logger = LoggerFactory.getLogger(ExcelExport.class);
HttpServletResponse response;
// 文件名
private String fileName;
//文件保存路径
private String fileDir;
//sheet名
private String sheetName;
//表头字体
private String titleFontType = "Arial Unicode MS";
//表头背景色
private String titleBackColor = "C1FBEE";
//表头字号
private short titleFontSize = 12;
//添加自动筛选的列 如 A:M
private String address = "";
//正文字体
private String contentFontType = "Arial Unicode MS";
//正文字号
private short contentFontSize = 12;
//Float类型数据小数位
private String floatDecimal = "0.00";
//Double类型数据小数位
private String doubleDecimal = "0.00";
//设置列的公式
private String colFormula[] = null;
DecimalFormat floatDecimalFormat = new DecimalFormat(floatDecimal);
DecimalFormat doubleDecimalFormat = new DecimalFormat(doubleDecimal);
private HSSFWorkbook workbook = null;
public ExcelExport() {
}
public ExcelExport(String fileDir, String sheetName) {
this.fileDir = fileDir;
this.sheetName = sheetName;
workbook = new HSSFWorkbook();
}
public ExcelExport(HttpServletResponse response, String fileName, String sheetName) {
this.fileName = fileName;
this.response = response;
this.sheetName = sheetName;
workbook = new HSSFWorkbook();
}
/**
* 设置表头字体.
*
* @param titleFontType
*/
public void setTitleFontType(String titleFontType) {
this.titleFontType = titleFontType;
}
/**
* 设置表头背景色.
*
* @param titleBackColor 十六进制
*/
public void setTitleBackColor(String titleBackColor) {
this.titleBackColor = titleBackColor;
}
/**
* 设置表头字体大小.
*
* @param titleFontSize
*/
public void setTitleFontSize(short titleFontSize) {
this.titleFontSize = titleFontSize;
}
/**
* 设置表头自动筛选栏位,如A:AC.
*
* @param address
*/
public void setAddress(String address) {
this.address = address;
}
/**
* 设置正文字体.
*
* @param contentFontType
*/
public void setContentFontType(String contentFontType) {
this.contentFontType = contentFontType;
}
/**
* 设置正文字号.
*
* @param contentFontSize
*/
public void setContentFontSize(short contentFontSize) {
this.contentFontSize = contentFontSize;
}
/**
* 设置float类型数据小数位 默认.00
*
* @param doubleDecimal 如 ".00"
*/
public void setDoubleDecimal(String doubleDecimal) {
this.doubleDecimal = doubleDecimal;
}
/**
* 设置doubel类型数据小数位 默认.00
*
* @param floatDecimalFormat 如 ".00
*/
public void setFloatDecimalFormat(DecimalFormat floatDecimalFormat) {
this.floatDecimalFormat = floatDecimalFormat;
}
/**
* 设置列的公式
*
* @param colFormula 存储i-1列的公式 涉及到的行号使用@替换 如A@+B@
*/
public void setColFormula(String[] colFormula) {
this.colFormula = colFormula;
}
/**
* 写excel.
* xls方式
*
* @param titleColumn 对应bean的属性名
* @param titleName excel要导出的列名
* @param titleSize 列宽
* @param dataList 数据
*/
public void writeExcel(String titleColumn[], String titleName[], int titleSize[], List<?> dataList) {
//添加Worksheet（不添加sheet时生成的xls文件打开时会报错)
Sheet sheet = workbook.createSheet(this.sheetName);
//新建文件
OutputStream out = null;
try {
if (fileDir != null) {
//有文件路径
out = new FileOutputStream(fileDir);
} else {
//否则，直接写到输出流中
out = response.getOutputStream();
fileName = fileName + ".xls";
response.setContentType("application/msexcel;charset=UTF-8");
response.setHeader("Content-Disposition", "attachment; filename="
+ URLEncoder.encode(fileName, "UTF-8"));
}
//写入excel的表头
Row titleNameRow = workbook.getSheet(sheetName).createRow(0);
//设置样式
CellStyle titleStyle = workbook.createCellStyle();
titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, titleFontType, (short) titleFontSize);
titleStyle = (HSSFCellStyle) setColor(titleStyle, titleBackColor, (short) 10);
for (int i = 0; i < titleName.length; i++) {
sheet.setColumnWidth(i, titleSize[i] * 256); //设置宽度
Cell cell = titleNameRow.createCell(i);
cell.setCellStyle(titleStyle);
cell.setCellValue(titleName[i].toString());
}
//为表头添加自动筛选
if (!"".equals(address)) {
CellRangeAddress c = (CellRangeAddress) CellRangeAddress.valueOf(address);
sheet.setAutoFilter(c);
}
//通过反射获取数据并写入到excel中
if (dataList != null && dataList.size() > 0) {
//设置样式
HSSFCellStyle dataStyle = workbook.createCellStyle();
titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, contentFontType, (short) contentFontSize);
if (titleColumn.length > 0) {
for (int rowIndex = 1; rowIndex <= dataList.size(); rowIndex++) {
Object obj = dataList.get(rowIndex - 1); //获得该对象
Class clsss = obj.getClass(); //获得该对对象的class实例
Row dataRow = workbook.getSheet(sheetName).createRow(rowIndex);
for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
String title = titleColumn[columnIndex].toString().trim();
if (!"".equals(title)) { //字段不为空
//使首字母大写
String UTitle = Character.toUpperCase(title.charAt(0)) + title.substring(1, title.length()); // 使其首字母大写;
String methodName = "get" + UTitle;
// 设置要执行的方法
Method method = clsss.getDeclaredMethod(methodName);
//获取返回类型
String returnType = method.getReturnType().getName();
Object object = method.invoke(obj);
String data = method.invoke(obj) == null ? "" : object.toString();
Cell cell = dataRow.createCell(columnIndex);
if (data != null && !"".equals(data)) {
if ("int".equals(returnType)) {
cell.setCellValue(Integer.parseInt(data));
} else if ("long".equals(returnType)) {
cell.setCellValue(Long.parseLong(data));
} else if ("float".equals(returnType)) {
cell.setCellValue(floatDecimalFormat.format(Float.parseFloat(data)));
} else if ("double".equals(returnType)) {
cell.setCellValue(doubleDecimalFormat.format(Double.parseDouble(data)));
} else if (Date.class.getName().equals(returnType)) {
cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(object));
} else {
cell.setCellValue(data);
}
}
} else { //字段为空 检查该列是否是公式
if (colFormula != null) {
String sixBuf = colFormula[columnIndex].replace("@", (rowIndex + 1) + "");
Cell cell = dataRow.createCell(columnIndex);
cell.setCellFormula(sixBuf);
}
}
}
}
}
}
workbook.write(out);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
logger.debug("导出写Excel异常");
}
}
}
}
/**
* xlsx方式
*
* @param response
* @param fileName
* @param titleColumn
* @param titleName
* @param titleSize
* @param dataList
*/
public void writeBigExcel(HttpServletResponse response, String fileName, String titleColumn[],
String titleName[], int titleSize[], List<?> dataList) {
try {
SXSSFWorkbook workbook = new SXSSFWorkbook(100);
OutputStream out = response.getOutputStream();
String lastFileName = fileName + ".xlsx";
response.setContentType("application/msexcel;charset=UTF-8");
response.setHeader("Content-Disposition", "attachment; filename="
+ URLEncoder.encode(lastFileName, "UTF-8"));
int k = 0;
int rowIndex;
Sheet sheet = workbook.createSheet(fileName + (k + 1));
//写入excel的表头
Row titleNameRow = workbook.getSheet(fileName + (k + 1)).createRow(0);
for (int i = 0; i < titleName.length; i++) {
sheet.setColumnWidth(i, titleSize[i] * 256); //设置宽度
Cell cell = titleNameRow.createCell(i);
cell.setCellValue(titleName[i]);
}
//写入到excel中
if (dataList != null && dataList.size() > 0) {
if (titleColumn.length > 0) {
for (int index = 0; index < dataList.size(); index++) {
//每个sheet3W条数据
if (index != 0 && (index) % 30000 == 0) {
k = k + 1;
sheet = workbook.createSheet(fileName + (k + 1));
//写入excel的表头
titleNameRow = workbook.getSheet(fileName + (k + 1)).createRow(0);
for (int i = 0; i < titleName.length; i++) {
sheet.setColumnWidth(i, titleSize[i] * 256); //设置宽度
Cell cell = titleNameRow.createCell(i);
cell.setCellValue(titleName[i]);
}
}
if (index < 30000) {
rowIndex = index + 1;
} else {
rowIndex = index - 30000 * ((index) / 30000) + 1;
}
Object obj = dataList.get(index);
Class clazz = obj.getClass();
Row dataRow = workbook.getSheet(fileName + (k + 1)).createRow(rowIndex);
for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
String title = titleColumn[columnIndex].trim();
if (!"".equals(title)) {
// 获取返回类型
String UTitle = Character.toUpperCase(title.charAt(0)) + title.substring(1, title.length()); // 使其首字母大写;
String methodName = "get" + UTitle;
Method method = clazz.getDeclaredMethod(methodName);
String returnType = method.getReturnType().getName();
Object object = method.invoke(obj);
String data = method.invoke(obj) == null ? "" : object.toString();
Cell cell = dataRow.createCell(columnIndex);
if (data != null && !"".equals(data)) {
if ("int".equals(returnType)) {
cell.setCellValue(Integer.parseInt(data));
} else if ("long".equals(returnType)) {
cell.setCellValue(Long.parseLong(data));
} else if ("float".equals(returnType)) {
cell.setCellValue(new DecimalFormat("0.00").format(Float.parseFloat(data)));
} else if ("double".equals(returnType)) {
cell.setCellValue(new DecimalFormat("0.00").format(Double.parseDouble(data)));
} else if (Date.class.getName().equals(returnType)) {
cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(object));
} else {
cell.setCellValue(data);
}
} else { //字段为空 检查该列是否是公式
if (colFormula != null) {
String sixBuf = colFormula[columnIndex].replace("@", (rowIndex + 1) + "");
cell = dataRow.createCell(columnIndex);
cell.setCellFormula(sixBuf);
}
}
}
}
}
}
}
workbook.write(out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 将16进制的颜色代码写入样式中来设置颜色
*
* @param style 保证style统一
* @param color 颜色：66FFDD
* @param index 索引 8-64 使用时不可重复
* @return
*/
public CellStyle setColor(CellStyle style, String color, short index) {
if ("".equals(color)) {
//转为RGB码
int r = Integer.parseInt((color.substring(0, 2)), 16); //转为16进制
int g = Integer.parseInt((color.substring(2, 4)), 16);
int b = Integer.parseInt((color.substring(4, 6)), 16);
//自定义cell颜色
HSSFPalette palette = workbook.getCustomPalette();
palette.setColorAtIndex((short) index, (byte) r, (byte) g, (byte) b);
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillForegroundColor(index);
}
return style;
}
/**
* 设置字体并加外边框
*
* @param style 样式
* @param style 字体名
* @param style 大小
* @return
*/
public CellStyle setFontAndBorder(CellStyle style, String fontName, short size) {
HSSFFont font = workbook.createFont();
font.setFontHeightInPoints(size);
font.setFontName(fontName);
font.setBold(true);//是否加粗
style.setFont(font);
style.setBorderBottom(BorderStyle.THIN); //下边框
style.setBorderLeft(BorderStyle.THIN);//左边框
style.setBorderTop(BorderStyle.THIN);//上边框
style.setBorderRight(BorderStyle.THIN);//右边框
style.setFillForegroundColor(HSSFColor.RED.index);// 设置背景色
return style;
}
}调用例子
导出xls
/**
* 导出Excel所有
*
* @param response
*/
@Override
public void exportExcel(HttpServletResponse response, Long companyId) {
List<EpcSystemDictionary> epcSystemDictionaryList = epcSystemDictionaryMapper.getAll(companyId);
ExcelExport excelExport = new ExcelExport(response, "数据字典总数据", "sheet1");
excelExport.writeExcel(new String[]{"code", "name", "enName", "level", "sort"}
, new String[]{"编号", "名称", "英文名称", "层级", "排序"}
, new int[]{30, 30, 30, 30, 30}, epcSystemDictionaryList);
}导出xlsx
/**
* excel数据 牧场数据导出
*
* @param cusId
* @return
*/
@GetMapping("/export")
@ResponseBody
@CrossOrigin
public void export(@RequestParam String cusId, HttpServletResponse response) {
if (cusId == null || cusId.isEmpty()) {
throw new BusinessException("cusId不能为空");
}
List<FarmDevice> list = mangeMapper.findFarmDeviceByCusId(cusId);
if (list.size() > 0) {
ExcelExport excelExport = new ExcelExport();
String title = "牧场数据导出Excel";
String[] titleColumn = {"farmName", "farmContactName"}; //该牧场名称对应的属性farmName
String[] titleName = {"牧场名称", "牧场主"}; //表头，列名
int[] titleSize = {20, 20};
excelExport.writeBigExcel(response, title, titleColumn, titleName, titleSize, list);
} else {
log.info("该客户下没有牧场！");
}
}
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