Maven 地址
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.15</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>3.15</version>
</dependency>
<!--start-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.15</version>
</dependency>
<dependency>
<groupId>fr.opensagres.xdocreport</groupId>
<artifactId>xdocreport</artifactId>
<version>1.0.6</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.15</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>ooxml-schemas</artifactId>
<version>1.3</version>
</dependency>2.源码
package com.ys.gassys.jbean;
import com.alibaba.fastjson.JSON;
import com.ys.gassys.bean.BeanUtil;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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 java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.*;
import com.ys.*;
/**
* Created with IntelliJ IDEA.
* Description:
*
* @author 王飞焱
* Date: 12:01
* Time: 2018/8/2
*/
public class ExcelUtils {
private final static String excel2003L =".xls"; //2003- 版本的excel
private final static String excel2007U =".xlsx"; //2007+ 版本的excel
/**
* 描述：获取IO流中的数据，组装成List<List<Object>>对象
* @param in,fileName
* @return
* @throws IOException
*/
public static List<List<Object>> getBankListByExcel(InputStream in,String fileName) throws Exception{
List<List<Object>> list = null;
//创建Excel工作薄
Workbook work = getWorkbook(in,fileName);
if(null == work){
throw new Exception("Excel工作薄为空！");
}
Sheet sheet = null; //页数
Row row = null; //行数
Cell cell = null; //列数
list = new ArrayList<List<Object>>();
//遍历Excel中所有的sheet
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if(sheet==null){continue;}
//遍历当前sheet中的所有行
for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
row = sheet.getRow(j);
//遍历所有的列
List<Object> li = new ArrayList<Object>();
for (int y = 0; y < 30; y++) {
cell = row.getCell(y);
System.out.println("我是cell"+cell);
li.add(getValue(cell));
}
list.add(li);
}
}
return list;
}
/**
* 描述：根据文件后缀，自适应上传文件的版本
* @param inStr,fileName
* @return
* @throws Exception
*/
public static Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if(excel2003L.equals(fileType)){
wb = new HSSFWorkbook(inStr); //2003-
}else if(excel2007U.equals(fileType)){
wb = new XSSFWorkbook(inStr); //2007+
}else{
throw new Exception("解析的文件格式有误！");
}
return wb;
}
/**
* 描述：对表格中数值进行格式化
* @param cell
* @return
*/
//解决excel类型问题，获得数值
public static String getValue(Cell cell) {
String value = "";
if(null==cell){
return value;
}
switch (cell.getCellType()) {
//数值型
case Cell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil.isCellDateFormatted(cell)) {
//如果是date类型则 ，获取该cell的date值
Date date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue());
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
value = format.format(date);;
}else {// 纯数字
BigDecimal big=new BigDecimal(cell.getNumericCellValue());
value = big.toString();
//解决1234.0 去掉后面的.0
if(null!=value&&!"".equals(value.trim())){
String[] item = value.split("[.]");
if(1<item.length&&"0".equals(item[1])){
value=item[0];
}
}
}
break;
//字符串类型
case Cell.CELL_TYPE_STRING:
value = cell.getStringCellValue().toString();
break;
// 公式类型
case Cell.CELL_TYPE_FORMULA:
//读公式计算值
value = String.valueOf(cell.getNumericCellValue());
if (value.equals("NaN")) {// 如果获取的数据值为非法值,则转换为获取字符串
value = cell.getStringCellValue().toString();
}
break;
// 布尔类型
case Cell.CELL_TYPE_BOOLEAN:
value = " "+ cell.getBooleanCellValue();
break;
default:
value = cell.getStringCellValue().toString();
}
if("null".endsWith(value.trim())){
value="";
}
return value;
}
public static List<BeanUtil> getBankListByExcel1(InputStream in, String fileName) throws Exception{
List<BeanUtil> list = null;
//创建Excel工作薄
Workbook work = getWorkbook(in,fileName);
if(null == work){
throw new Exception("Excel工作薄为空！");
}
Sheet sheet = null; //页数
Row row = null; //行数
Cell cell = null; //列数
list = new ArrayList<>();
//遍历Excel中所有的sheet
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if(sheet==null){continue;}
//遍历当前sheet中的所有行
BeanUtil beanUtil = null;
for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
row = sheet.getRow(j);
beanUtil = new BeanUtil();
for (int y = 0; y < 4; y++) {
cell = row.getCell(y);
if(y == 0){
beanUtil.setProjectName(cell.toString());
}
if (y == 1) {
beanUtil.setSpecimen(cell.toString());
}
if (y == 2) {
beanUtil.setReferenceValue(cell.toString());
}
if (y == 3) {
beanUtil.setClinicalSignificance(cell.toString());
}
}
list.add(beanUtil);
}
}
return list;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String line = scanner.nextLine();
char firstLetter = getFirstLetter(line);
if(firstLetter != Character.MIN_VALUE) {
System.out.println("首字母是：" + firstLetter);
} else {
System.out.println("字符串中不含有字母。");
}
}
static char getFirstLetter(String line) {
for(int i = 0; i < line.length(); i++) {
if(Character.isLetter(line.charAt(i))) {
return Character.toUpperCase(line.charAt(i));
}
}
return Character.MIN_VALUE;
}
}