java工具类之读取简单excel通用工具类

读取excel通用工具类

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;


/**
 * 读取Excel通用工具类
 * @author zql
 */
public class ReadExcel {

	/**
	 * 读取Excel
	 * 
	 * @param filepath 文件路径
	 * @param filename 文件名，包括扩展名
	 * @param startrow 开始行号，索引从0开始
	 * @param startcol 开始列号，索引从0开始
	 * @param sheetnum 工作簿，索引从0开始
	 * @return
	 */
	public List<Map<String,String>> readExcel(String filepath, String filename, int startrow, int startcol, int sheetnum) {
		List<Map<String, String>> varList = new ArrayList<Map<String, String>>();
		String suffix = filename.substring(filename.lastIndexOf(".") + 1);
		if ("xls".equals(suffix)) {
			varList = readExcel2003(filepath, filename, startrow, startcol, sheetnum);
		} else if ("xlsx".equals(suffix)) {
			varList = readExcel2007(filepath, filename, startrow, startcol, sheetnum);
		} else {
			System.out.println("Only excel files with XLS or XLSX suffixes are allowed to be read!");
			return null;
		}
		return varList;
	}
	
	/**
	 * 读取2003Excel
	 * 
	 * @param filepath 文件路径
	 * @param filename 文件名，包括扩展名
	 * @param startrow 开始行号，索引从0开始
	 * @param startcol 开始列号，索引从0开始
	 * @param sheetnum 工作簿，索引从0开始
	 * @return
	 */
	public List<Map<String,String>> readExcel2003(String filepath, String filename, int startrow, int startcol, int sheetnum) {
		List<Map<String, String>> varList = new ArrayList<Map<String, String>>();
		try {
			File target = new File(filepath, filename);
			FileInputStream fis = new FileInputStream(target);
			HSSFWorkbook wb = new HSSFWorkbook(fis);
			fis.close();
			// sheet 从0开始
			HSSFSheet sheet = wb.getSheetAt(sheetnum);
			// 取得最后一行的行号
			int rowNum = sheet.getLastRowNum() + 1;

			HSSFRow rowTitle = sheet.getRow(0);
			// 标题行的最后一个单元格位置
			int cellTitleNum = rowTitle.getLastCellNum();
			String[] title = new String[cellTitleNum];
			for (int i = startcol; i < cellTitleNum; i++) {
				HSSFCell cell = rowTitle.getCell(Short.parseShort(i + ""));
				if (cell != null) {
					cell.setCellType(CellType.STRING);
					title[i] = cell.getStringCellValue();
				} else {
					title[i] = "";
				}
			}

			// 行循环开始
			for (int i = startrow + 1; i < rowNum; i++) {
				Map<String, String> varpd = new HashMap<String, String>();
				// 行
				HSSFRow row = sheet.getRow(i);
				// 列循环开始
				for (int j = startcol; j < cellTitleNum; j++) {

					HSSFCell cell = row.getCell(Short.parseShort(j + ""));
					String cellValue = "";
					if (cell != null) {
						// 把类型先设置为字符串类型
						cell.setCellType(CellType.STRING);
						cellValue = cell.getStringCellValue();
					}
					varpd.put(title[j], cellValue);
				}
				varList.add(varpd);
			}
			wb.close();
		} catch (Exception e) {
			System.out.println(e);
		}
		return varList;
	}
	
	/**
	 * 读取2007Excel
	 * 
	 * @param filepath 文件路径
	 * @param filename 文件名，包括扩展名
	 * @param startrow 开始行号，索引从0开始
	 * @param startcol 开始列号，索引从0开始
	 * @param sheetnum 工作簿，索引从0开始
	 * @return
	 */
	public List<Map<String,String>> readExcel2007(String filepath, String filename, int startrow, int startcol, int sheetnum) {
		List<Map<String, String>> varList = new ArrayList<Map<String, String>>();
		try {
			File target = new File(filepath, filename);
			InputStream ins = new FileInputStream(target);
			XSSFWorkbook wb = new XSSFWorkbook(ins);
			ins.close();
			// 得到Excel工作表对象
			XSSFSheet sheet = wb.getSheetAt(sheetnum);
			// 取得最后一行的行号
			int rowNum = sheet.getLastRowNum() + 1;

			XSSFRow rowTitle = sheet.getRow(0);
			int cellTitleNum = rowTitle.getLastCellNum();
			String[] title = new String[cellTitleNum];
			for (int i = startcol; i < cellTitleNum; i++) {
				XSSFCell cell = rowTitle.getCell(Short.parseShort(i + ""));
				if (cell != null) {
					// 把类型先设置为字符串类型
					cell.setCellType(CellType.STRING);
					title[i] = cell.getStringCellValue();
				} else {
					title[i] = "";
				}
			}

			// 行循环开始
			for (int i = startrow + 1; i < rowNum; i++) {
				Map<String, String> varpd = new HashMap<String, String>();
				// 得到Excel工作表的行
				XSSFRow row = sheet.getRow(i);
				// 列循环开始
				for (int j = startcol; j < cellTitleNum; j++) {
					// 得到Excel工作表指定行的单元格
					XSSFCell cell = row.getCell(j);
					String cellValue = "";
					if (cell != null) {
						// 把类型先设置为字符串类型
						cell.setCellType(CellType.STRING);
						cellValue = cell.getStringCellValue();
					}
					varpd.put(title[j], cellValue);
				}
				varList.add(varpd);
			}
			wb.close();
		} catch (Exception e) {
			System.out.println(e);
		}
		return varList;
	}
	
}

读取excel通用工具示例测试类

import java.util.List;
import java.util.Map;

/**
 * @author zql
 *
 */
public class ReadExcelTest {
	
	public static void main(String[] args) throws Exception {
		ReadExcel r = new ReadExcel();
		List<Map<String, String>> list = r.readExcel("e:\\excel", "测试表格.xls", 0, 0, 0);
		if (list != null) {
			for (int i = 0; i < list.size(); i++) {
				Map<String, String> m = list.get(i);
				m.forEach((key, value) -> {
					System.out.println(key + ":" + value);
				});
				System.out.println();
			}
		}

		List<Map<String, String>> lists = r.readExcel("e:\\excel", "测试表格.xlsx", 0, 0, 0);
		if (lists != null) {
			for (int i = 0; i < lists.size(); i++) {
				Map<String, String> m = lists.get(i);
				m.forEach((key, value) -> {
					System.out.println(key + ":" + value);
				});
				System.out.println();
			}
		}
	}

}

普通项目需要引入的包
poi-4.0.1.jar
poi-ooxml-4.0.1.jar
poi-ooxml-schemas-4.0.1.jar
commons-codec-1.11.jar
commons-collections4-4.3.jar
commons-math3-3.6.1.jar
xmlbeans-3.0.2.jar
commons-compress-1.18.jar
curvesapi-1.06.jar

maven项目依赖

<!-- poi -->
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi</artifactId>
	<version>4.0.1</version>
</dependency>
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
	<version>4.0.1</version>
</dependency>