Java讀取Excel內容

依賴：

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.15</version>
</dependency>

代碼

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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.poifs.filesystem.POIFSFileSystem;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;


public class ExcelOperate {

    public static void main(String[] args) throws Exception {
        File file = new File("D:\\guide.csv");
        String[][] result = getData(file, 1);
        int rowLength = result.length;
        for (int i = 0; i < rowLength; i++) {
            System.out.println(result[i]);
            for (int j = 0; j < result[i].length; j++) {
                System.out.print(result[i][j] + "\t\t");
            }
            System.out.println();
        }
    }

    /**
     * 讀取Excel的內容，第一維數組存儲的是一行中格列的值，二維數組存儲的是多少個行
     *
     * @param file       讀取數據的源Excel
     * @param ignoreRows 讀取數據忽略的行數，比喻行頭不須要讀入 忽略的行數爲1
     * @return 讀出的Excel中數據的內容
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static String[][] getData(File file, int ignoreRows)
            throws FileNotFoundException, IOException {
        List<String[]> result = new ArrayList<String[]>();
        int rowSize = 0;
        BufferedInputStream in = new BufferedInputStream(new FileInputStream(
                file));
        // 打開HSSFWorkbook
        POIFSFileSystem fs = new POIFSFileSystem(in);
        HSSFWorkbook wb = new HSSFWorkbook(fs);
        HSSFCell cell = null;
        for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {
            HSSFSheet st = wb.getSheetAt(sheetIndex);
            // 第一行爲標題，不取
            for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {
                HSSFRow row = st.getRow(rowIndex);
                if (row == null) {
                    continue;
                }
                int tempRowSize = row.getLastCellNum() + 1;
                if (tempRowSize > rowSize) {
                    rowSize = tempRowSize;
                }
                String[] values = new String[rowSize];
                Arrays.fill(values, "");
                boolean hasValue = false;
                for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {
                    String value = "";
                    cell = row.getCell(columnIndex);
                    if (cell != null) {
                        // 注意：必定要設成這個，不然可能會出現亂碼,後面版本默認設置
                        //cell.setEncoding(HSSFCell.ENCODING_UTF_16);
                        switch (cell.getCellType()) {
                            case HSSFCell.CELL_TYPE_STRING:
                                value = cell.getStringCellValue();
                                break;
                            case HSSFCell.CELL_TYPE_NUMERIC:
                                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                                    Date date = cell.getDateCellValue();
                                    if (date != null) {
                                        value = new SimpleDateFormat("yyyy-MM-dd")
                                                .format(date);
                                    } else {
                                        value = "";
                                    }
                                } else {
                                    value = new DecimalFormat("0").format(cell

                                            .getNumericCellValue());
                                }
                                break;
                            case HSSFCell.CELL_TYPE_FORMULA:
                                // 導入時若是爲公式生成的數據則無值
                                if (!cell.getStringCellValue().equals("")) {
                                    value = cell.getStringCellValue();
                                } else {
                                    value = cell.getNumericCellValue() + "";
                                }
                                break;
                            case HSSFCell.CELL_TYPE_BLANK:
                                break;
                            case HSSFCell.CELL_TYPE_ERROR:
                                value = "";
                                break;
                            case HSSFCell.CELL_TYPE_BOOLEAN:
                                value = (cell.getBooleanCellValue() == true ? "Y"

                                        : "N");
                                break;
                            default:
                                value = "";
                        }
                    }
                    if (columnIndex == 0 && value.trim().equals("")) {
                        break;
                    }
                    values[columnIndex] = rightTrim(value);
                    hasValue = true;
                }
                if (hasValue) {
                    result.add(values);
                }
            }
        }
        in.close();
        String[][] returnArray = new String[result.size()][rowSize];
        for (int i = 0; i < returnArray.length; i++) {
            returnArray[i] = (String[]) result.get(i);
        }
        return returnArray;
    }


    /**
     * 去掉字符串右邊的空格
     *
     * @param str 要處理的字符串
     * @return 處理後的字符串
     */

    public static String rightTrim(String str) {
        if (str == null) {
            return "";
        }
        int length = str.length();
        for (int i = length - 1; i >= 0; i--) {
            if (str.charAt(i) != 0x20) {
                break;
            }
            length--;
        }
        return str.substring(0, length);
    }
}