java 读取Excel内容

[java]代码库

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

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;

public class ExcelOpearate {

	/**
	 * 读取Excel的内容，第一维数组储存的是一行中格列的值，二维数组中储存的是多少行
	 * 
	 * @param file
	 *            读取数据源Excel
	 * @param ignoreRows
	 *            读取数据忽略的行数，
	 * @return 读出的Excel中数据的内容
	 * @throws IOException
	 */
	public static String[][] getData(File file, int ignoreRows)
			throws IOException {
		List<String[]> result = new ArrayList<String[]>();
		int rowSize = 0;
		BufferedInputStream in = new BufferedInputStream(new FileInputStream(
				file));
		// 打开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);
			// 第一行为标题不读取
			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：一定要設成這個。否則可能會出現亂碼
						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());
								DecimalFormat df = new DecimalFormat("#");// 解决读取长数据为科学计数的问题
								value = String.valueOf(df.format(cell
										.getNumericCellValue()));
							}
							break;
						case HSSFCell.CELL_TYPE_FORMULA:
							// 导入时如果为公式生成的数据则无值
							if (!cell.getStringCellValue().equals("")) {
								value = cell.getStringCellValue();
							} else {
								value = cell.getNumericCellValue() + "";
							}
							break;

						case HSSFCell.CELL_TYPE_BLANK:
							value = "";
							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;

	}

	/**
	 * 去掉字符串右边的空格
	 * 
	 * @param str
	 *            要处理的字符串
	 * @return 处理后的字符串
	 */
	public static String rightTrim(String str) {
		// TODO Auto-generated method stub
		if (str == "") {
			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);
	}
}