java poi导入Excel、导出excel
导出meven架包
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.1</version>
</dependency>
导入Excel
public void uploadFile(HttpServletRequest request, HttpServletResponse response, @RequestParam(value="file",required = false) MultipartFile file) {
return import(request, response, file);
}
public void import(HttpServletRequest request, HttpServletResponse response, MultipartFile file) {
long startTime = System.currentTimeMillis();
//解析Excel
List<DTO> excelInfo = ReadPatientExcelUtil.getExcelInfo(file);
if(excelInfo!=null && excelInfo.size()>0){
for (int i = 0; i < excelInfo.size(); i++) {
DTO dto = excelInfo.get(i);
}
}else{
System.out.println("导入失败，请注意参数格式！");
}
long endTime = System.currentTimeMillis();
String time = String.valueOf((endTime - startTime) / 1000);
log.info("导入数据用时:"+time+"秒");
return ResponseMsg.success("导入成功！");
}
ReadPatientExcelUtil
import com.ly.directserver.dto.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.NumberToTextConverter;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/***
* 解析导入Excel数据
* @author manba
*/
@Slf4j
public class ReadPatientExcelUtil {
//总行数
private static int totalRows = 0;
//总条数
private static int totalCells = 0;
//错误信息接收器
private static String errorMsg;
/***
* 读取Excel
* @param mFile
* @return
*/
public static List<DTO> getExcelInfo(MultipartFile mFile) {
String fileName = mFile.getOriginalFilename();//获取文件名
try {
if (!validateExcel(fileName)) {// 验证文件名是否合格
return null;
}
boolean isExcel2003 = true;// 根据文件名判断文件是2003版本还是2007版本
if (isExcel2007(fileName)) {
isExcel2003 = false;
}
List<DTO> agentList = getExcel(mFile.getInputStream(), isExcel2003);
return agentList;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static List<DTO> getAgentExcel(InputStream is, boolean isExcel2003) {
try {
Workbook wb = null;
if (isExcel2003) {// 当excel是2003时,创建excel2003
wb = new HSSFWorkbook(is);
} else {// 当excel是2007时,创建excel2007
wb = new XSSFWorkbook(is);
}
List<DTO> DTOS = readExcelValue(wb);// 读取Excel里面客户的信息
return DTOS;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private static List<DTO> readExcelValue(Workbook wb) {
//默认会跳过第一行标题
// 得到第一个shell
Sheet sheet = wb.getSheetAt(0);
// 得到Excel的行数
totalRows = sheet.getPhysicalNumberOfRows();
// 得到Excel的列数(前提是有行数)
if (totalRows > 1 && sheet.getRow(0) != null) {
totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
}
List<DTO> DTOS = new ArrayList<>();
// 循环Excel行数
for (int r = 1; r < totalRows; r++) {
Row row = sheet.getRow(r);
if (row == null) {
continue;
}
DTO DTO = new DTO();
// 循环Excel的列
for (int c = 0; c < totalCells ; c++) {
Cell cell = row.getCell(c);
if (null != cell) {
if (c == 0) { //第一列
//如果是纯数字
if (cell.getCellTypeEnum() == CellType.NUMERIC) {
cell.setCellType(CellType.NUMERIC);
int a =(int) cell.getNumericCellValue();
}
} else if (c == 1) {
//如果是double
if (cell.getCellTypeEnum() == CellType.NUMERIC) {
cell.setCellType(CellType.NUMERIC);
}
double stringCellValue = cell.getNumericCellValue();
} else if (c == 2) {
if (cell.getCellTypeEnum() == CellType.STRING) {
cell.setCellType(CellType.STRING);
//如果是字符串
String str = cell.getStringCellValue();
}else if (cell.getCellTypeEnum() == CellType.NUMERIC) {
cell.setCellType(CellType.NUMERIC);
//如果是数字，需要转换为字符串
String desc = NumberToTextConverter.toText(cell.getNumericCellValue());
}
}
}
}
//将excel解析出来的数据赋值给对象添加到list中
// 添加到list
DTOS.add(DTO);
}
return DTOS;
}
}
导出Excel
public void exportCollectRecord(HttpServletResponse res){
File file = createExcelFile();
FileUtils.downloadFile(res, file, file.getName());
}
public static File createExcelFile(List<DTO> list) {
Workbook workbook = new XSSFWorkbook();
//创建一个sheet，括号里可以输入sheet名称，默认为sheet0
Sheet sheet = workbook.createSheet();
Row row0 = sheet.createRow(0);
int columnIndex = 0;
row0.createCell(columnIndex).setCellValue("xxx");
row0.createCell(++columnIndex).setCellValue("xxx");
row0.createCell(++columnIndex).setCellValue("xxx");
for (int i = 0; i < list.size(); i++) {
DTO dto = list.get(i);
Row row = sheet.createRow(i + 1);
for (int j = 0; j < columnIndex + 2; j++) {
row.createCell(j);
}
columnIndex = 0;
row.getCell(columnIndex).setCellValue("xxx");
row.getCell(++columnIndex).setCellValue("xxx");
row.getCell(++columnIndex).setCellValue("xxx");
}
//调用PoiUtils工具包
return PoiUtils.createExcelFile(workbook, DateUtils.fmtDateToStr(new Date(), "yyyy-MM-dd HH_mm_ss") );
}
PoiUtils文章来源：https://www.toymoban.com/news/detail-610281.html
import org.apache.poi.ss.usermodel.Workbook;
import java.io.*;
public class PoiUtils {
/**
* 生成Excel文件
* @param workbook
* @param fileName
* @return
*/
public static File createExcelFile(Workbook workbook, String fileName) {
OutputStream stream = null;
File file = null;
try {
//用了createTempFile，这是创建临时文件，系统会自动给你的临时文件编号，所以后面有号码，你用createNewFile的话就完全按照你指定的名称来了
file = File.createTempFile(fileName, ".xlsx");
stream = new FileOutputStream(file.getAbsoluteFile());
workbook.write(stream);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
//这里调用了IO工具包控制开关
IOUtils.closeQuietly(workbook);
IOUtils.closeQuietly(stream);
}
return file;
}
}
FileUtils文章来源地址https://www.toymoban.com/news/detail-610281.html
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.*;
import java.lang.reflect.Method;
import java.security.MessageDigest;
public class FileUtils {
/**
* 下载文件
* @param response
* @param file
* @param newFileName
*/
public static void downloadFile(HttpServletResponse response, File file, String newFileName) {
try {
response.setHeader("Content-Disposition", "attachment; filename=" + new String(newFileName.getBytes("ISO-8859-1"), "UTF-8"));
BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
InputStream is = new FileInputStream(file.getAbsolutePath());
BufferedInputStream bis = new BufferedInputStream(is);
int length = 0;
byte[] temp = new byte[1 * 1024 * 10];
while ((length = bis.read(temp)) != -1) {
bos.write(temp, 0, length);
}
bos.flush();
bis.close();
bos.close();
is.close();
} catch (Exception e) {
e.printStackTrace();
}
}
// 将输入流使用指定编码转化为字符串
public static String inputStream2String(InputStream inputStream, String charset) throws Exception {
// 建立输入流读取类
InputStreamReader reader = new InputStreamReader(inputStream, charset);
// 设定每次读取字符个数
char[] data = new char[512];
int dataSize = 0;
// 循环读取
StringBuilder stringBuilder = new StringBuilder();
while ((dataSize = reader.read(data)) != -1) {
stringBuilder.append(data, 0, dataSize);
}
return stringBuilder.toString();
}
private static DocumentBuilderFactory documentBuilderFactory = null;
public static <T> T parseXml2Obj(String xml, Class<T> tclass) throws Exception {
if (isEmpty(xml)) throw new NullPointerException("要解析的xml字符串不能为空。");
if (documentBuilderFactory == null) { // 文档解析器工厂初始
documentBuilderFactory = DocumentBuilderFactory.newInstance();
}
// 拿到一个文档解析器。
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
// 准备数据并解析。
byte[] bytes = xml.getBytes("UTF-8");
Document parsed = documentBuilder.parse(new ByteArrayInputStream(bytes));
// 获取数据
T obj = tclass.newInstance();
Element documentElement = parsed.getDocumentElement();
NodeList childNodes = documentElement.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
Node item = childNodes.item(i);
// 节点类型是 ELEMENT 才读取值
// 进行此判断是因为如果xml不是一行，而是多行且有很好的格式的，就会产生一些文本的node，这些node内容只有换行符或空格
// 所以排除这些换行符和空格。
if (item.getNodeType() == Node.ELEMENT_NODE) {
String key = item.getNodeName();
String value = item.getTextContent();
// 拿到设置值的set方法。
Method declaredMethod = tclass.getDeclaredMethod("set" + key, String.class);
if (declaredMethod != null) {
declaredMethod.setAccessible(true);
declaredMethod.invoke(obj, value); // 设置值
}
}
}
return obj;
}
// 将二进制数据转换为16进制字符串。
public static String byte2HexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length <= 0) {
return null;
}
for (byte b : src) {
String hv = Integer.toHexString(b & 0xFF);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
// 对字符串进行sha1加签
public static String sha1(String context) throws Exception {
// 获取sha1算法封装类
MessageDigest sha1Digest = MessageDigest.getInstance("SHA-1");
// 进行加密
byte[] digestResult = sha1Digest.digest(context.getBytes("UTF-8"));
// 转换为16进制字符串
return byte2HexString(digestResult);
}
public static boolean isEmpty(String value) {
return value == null || value.length() == 0;
}
}
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