运用android listener监听模式设计excel的读取

熟悉java开发的人想必不会对监听模式陌生,在android的应用层的设计中,普遍采用这种监听模式(点击事件、Touch事件等)

本人最近研究android sdk源代码发现这是一种对api很好的封装的模式,您在写接口或是工具类时运用这种模式会有意想不到的收获。

现学现用我运用这种模式对读取excel的类进行了封装,简单的封装了一个通用的excel读取类。


1、首先声明一个监听接口,接口中定义getData方法用于获得数据

package com.excel;

public interface ExcelDataListener {
	/**
	 * 获得excel数据
	 * @param data 获得excel内容
	 * @param sheet excel文档的sheet
	 */
	public abstract void getData(String data, String sheet);
}
package com.excel;

public interface ExcelDataListener {
	/**
	 * 获得excel数据
	 * @param data 获得excel内容
	 * @param sheet excel文档的sheet
	 */
	public abstract void getData(String data, String sheet);
}

2、实现excel文档读取类

package com.excel;
import java.io.IOException;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Date;
import java.util.HashMap;
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.poifs.filesystem.POIFSFileSystem;

/**
 * 操作Excel表格的功能类
 * 读取excel2003
 * @version 1.0
 */
public class ExcelReader2003 {
	private POIFSFileSystem fs;
	private HSSFWorkbook wb;
	private HSSFSheet sheet;
	private HSSFRow row;
	private ExcelDataListener mListener;  //声明监听事件变量
	
	public void setDataListener(ExcelDataListener l){  //设置监听
		mListener = l;
	}
	
	
	/**
	 * 读取Excel表格表头的内容
	 * 
	 * @param InputStream
	 * @return String 表头内容的数组
	 * 
	 */
	public String[] readExcelTitle(InputStream is) {
		try {
			fs = new POIFSFileSystem(is);
			wb = new HSSFWorkbook(fs);
		} catch (IOException e) {
			e.printStackTrace();
		}
		sheet = wb.getSheetAt(0);
		row = sheet.getRow(0);
		// 标题总列数
		int colNum = row.getPhysicalNumberOfCells();
		String[] title = new String[colNum];
		for (int i = 0; i < colNum; i++) {
			title[i] = getStringCellValue(row.getCell((short) i));
		}
		return title;
	}

	/**
	 * 读取Excel数据内容
	 * 
	 * @param InputStream
	 * @return Map 包含单元格数据内容的Map对象
	 */
	public Map<Integer, String> readExcelContent(InputStream is) {
		Map<Integer, String> content = new HashMap<Integer, String>();
		try {
			fs = new POIFSFileSystem(is);
			wb = new HSSFWorkbook(fs);
		} catch (IOException e) {
			e.printStackTrace();
		}
		for (int k = 0; k < wb.getNumberOfSheets(); k++) {
			String str = "";
			sheet = wb.getSheetAt(k);
			// 得到总行数
			int rowNum = sheet.getLastRowNum();
			// 正文内容应该从第二行开始,第一行为表头的标题
			for (int i = 0; i <= rowNum; i++) {
				row = sheet.getRow(i);
				if (row == null)
					continue;
				int colNum = row.getPhysicalNumberOfCells();
				int j = 0;
				while (j < colNum) {
					// 每个单元格的数据内容用"-"分割开,以后需要时用String类的replace()方法还原数据
					// 也可以将每个单元格的数据设置到一个javabean的属性中,此时需要新建一个javabean
					str += getStringCellValue(row.getCell((short) j)).trim()
							+ "-";
					j++;
				}
				mListener.getData(str, "sheet"+k);         //触发监听事件
				content.put(i, str);
				str = "";
			}
		}
		return content;
	}

	/**
	 * 获取单元格数据内容为字符串类型的数据
	 * 
	 * @param cell
	 *            Excel单元格
	 * @return String 单元格数据内容
	 */
	private String getStringCellValue(HSSFCell cell) {
		if(cell == null)
			return"";
		String strCell = "";
		switch (cell.getCellType()) {
		case HSSFCell.CELL_TYPE_STRING:
			strCell = cell.getStringCellValue();
			break;
		case HSSFCell.CELL_TYPE_NUMERIC:
			strCell = String.valueOf(cell.getNumericCellValue());
			break;
		case HSSFCell.CELL_TYPE_BOOLEAN:
			strCell = String.valueOf(cell.getBooleanCellValue());
			break;
		case HSSFCell.CELL_TYPE_BLANK:
			strCell = "";
			break;
		default:
			strCell = "";
			break;
		}
		if (strCell.equals("") || strCell == null) {
			return "";
		}
		if (cell == null) {
			return "";
		}
		return strCell;
	}

	/**
	 * 获取单元格数据内容为日期类型的数据
	 * 
	 * @param cell
	 *            Excel单元格
	 * @return String 单元格数据内容
	 */
	private String getDateCellValue(HSSFCell cell) {
		String result = "";
		try {
			int cellType = cell.getCellType();
			if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
				Date date = cell.getDateCellValue();
				result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
						+ "-" + date.getDate();
			} else if (cellType == HSSFCell.CELL_TYPE_STRING) {
				String date = getStringCellValue(cell);
				result = date.replaceAll("[年月]", "-").replace("日", "").trim();
			} else if (cellType == HSSFCell.CELL_TYPE_BLANK) {
				result = "";
			}
		} catch (Exception e) {
			System.out.println("日期格式不正确!");
			e.printStackTrace();
		}
		return result;
	}

	/**
	 * 获得Excel表中的内容
	 * 
	 * @param args
	 *@return
	 * @author zcg 2012-12-15
	 */
	public Map<Integer, String> getContent(String path) {
		Map<Integer, String> map = null;
		try {
			// 对读取Excel表格内容测试
			InputStream is2 = new FileInputStream(path);
			map = readExcelContent(is2);
		} catch (FileNotFoundException e) {
			System.out.println("未找到指定路径的文件!");
			e.printStackTrace();
		}
		return map;
	}

	public String[] getTitle(String path) {
		String[] title = null;
		try {
			// 对读取Excel表格标题测试
			InputStream is = new FileInputStream(path);
			ExcelReader2003 excelReader = new ExcelReader2003();
			title = excelReader.readExcelTitle(is);
			/*
			 * System.out.println("获得Excel表格的标题:"); for (String s : title) {
			 * System.out.print(s + " "); }
			 */
		} catch (FileNotFoundException e) {
			System.out.println("未找到指定路径的文件!");
			e.printStackTrace();
		}
		return title;

	}
}
package com.excel;
import java.io.IOException;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Date;
import java.util.HashMap;
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.poifs.filesystem.POIFSFileSystem;

/**
 * 操作Excel表格的功能类
 * 读取excel2003
 * @version 1.0
 */
public class ExcelReader2003 {
	private POIFSFileSystem fs;
	private HSSFWorkbook wb;
	private HSSFSheet sheet;
	private HSSFRow row;
	private ExcelDataListener mListener;  //声明监听事件变量
	
	public void setDataListener(ExcelDataListener l){  //设置监听
		mListener = l;
	}
	
	
	/**
	 * 读取Excel表格表头的内容
	 * 
	 * @param InputStream
	 * @return String 表头内容的数组
	 * 
	 */
	public String[] readExcelTitle(InputStream is) {
		try {
			fs = new POIFSFileSystem(is);
			wb = new HSSFWorkbook(fs);
		} catch (IOException e) {
			e.printStackTrace();
		}
		sheet = wb.getSheetAt(0);
		row = sheet.getRow(0);
		// 标题总列数
		int colNum = row.getPhysicalNumberOfCells();
		String[] title = new String[colNum];
		for (int i = 0; i < colNum; i++) {
			title[i] = getStringCellValue(row.getCell((short) i));
		}
		return title;
	}

	/**
	 * 读取Excel数据内容
	 * 
	 * @param InputStream
	 * @return Map 包含单元格数据内容的Map对象
	 */
	public Map<Integer, String> readExcelContent(InputStream is) {
		Map<Integer, String> content = new HashMap<Integer, String>();
		try {
			fs = new POIFSFileSystem(is);
			wb = new HSSFWorkbook(fs);
		} catch (IOException e) {
			e.printStackTrace();
		}
		for (int k = 0; k < wb.getNumberOfSheets(); k++) {
			String str = "";
			sheet = wb.getSheetAt(k);
			// 得到总行数
			int rowNum = sheet.getLastRowNum();
			// 正文内容应该从第二行开始,第一行为表头的标题
			for (int i = 0; i <= rowNum; i++) {
				row = sheet.getRow(i);
				if (row == null)
					continue;
				int colNum = row.getPhysicalNumberOfCells();
				int j = 0;
				while (j < colNum) {
					// 每个单元格的数据内容用"-"分割开,以后需要时用String类的replace()方法还原数据
					// 也可以将每个单元格的数据设置到一个javabean的属性中,此时需要新建一个javabean
					str += getStringCellValue(row.getCell((short) j)).trim()
							+ "-";
					j++;
				}
				mListener.getData(str, "sheet"+k);         //触发监听事件
				content.put(i, str);
				str = "";
			}
		}
		return content;
	}

	/**
	 * 获取单元格数据内容为字符串类型的数据
	 * 
	 * @param cell
	 *            Excel单元格
	 * @return String 单元格数据内容
	 */
	private String getStringCellValue(HSSFCell cell) {
		if(cell == null)
			return"";
		String strCell = "";
		switch (cell.getCellType()) {
		case HSSFCell.CELL_TYPE_STRING:
			strCell = cell.getStringCellValue();
			break;
		case HSSFCell.CELL_TYPE_NUMERIC:
			strCell = String.valueOf(cell.getNumericCellValue());
			break;
		case HSSFCell.CELL_TYPE_BOOLEAN:
			strCell = String.valueOf(cell.getBooleanCellValue());
			break;
		case HSSFCell.CELL_TYPE_BLANK:
			strCell = "";
			break;
		default:
			strCell = "";
			break;
		}
		if (strCell.equals("") || strCell == null) {
			return "";
		}
		if (cell == null) {
			return "";
		}
		return strCell;
	}

	/**
	 * 获取单元格数据内容为日期类型的数据
	 * 
	 * @param cell
	 *            Excel单元格
	 * @return String 单元格数据内容
	 */
	private String getDateCellValue(HSSFCell cell) {
		String result = "";
		try {
			int cellType = cell.getCellType();
			if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
				Date date = cell.getDateCellValue();
				result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
						+ "-" + date.getDate();
			} else if (cellType == HSSFCell.CELL_TYPE_STRING) {
				String date = getStringCellValue(cell);
				result = date.replaceAll("[年月]", "-").replace("日", "").trim();
			} else if (cellType == HSSFCell.CELL_TYPE_BLANK) {
				result = "";
			}
		} catch (Exception e) {
			System.out.println("日期格式不正确!");
			e.printStackTrace();
		}
		return result;
	}

	/**
	 * 获得Excel表中的内容
	 * 
	 * @param args
	 *@return
	 * @author zcg 2012-12-15
	 */
	public Map<Integer, String> getContent(String path) {
		Map<Integer, String> map = null;
		try {
			// 对读取Excel表格内容测试
			InputStream is2 = new FileInputStream(path);
			map = readExcelContent(is2);
		} catch (FileNotFoundException e) {
			System.out.println("未找到指定路径的文件!");
			e.printStackTrace();
		}
		return map;
	}

	public String[] getTitle(String path) {
		String[] title = null;
		try {
			// 对读取Excel表格标题测试
			InputStream is = new FileInputStream(path);
			ExcelReader2003 excelReader = new ExcelReader2003();
			title = excelReader.readExcelTitle(is);
			/*
			 * System.out.println("获得Excel表格的标题:"); for (String s : title) {
			 * System.out.print(s + " "); }
			 */
		} catch (FileNotFoundException e) {
			System.out.println("未找到指定路径的文件!");
			e.printStackTrace();
		}
		return title;

	}
}

在此类中X行声明了ExcelDataListener的对象mListener;

关键在X行

mListener.getData(str, "sheet"+k);         //触发监听事件

触发监听函数。也就是说没读取excel中的一行数据就会触发本类中需要实现的getData函数。

3、测试类

package com.excel;

public class Test {
	private static String path = "D:\\ss.xls";
	public static void main(String args[]){
		ExcelReader2003 er = new ExcelReader2003();
		er.setDataListener(new ExcelDataListener() { //设置监听事件 
			@Override
			public void getData(String data, String sheet) {
				System.out.println(sheet+data); //得到返回的excel中每行的数据
			}
		});
		er.getContent(path); 
	}

}
package com.excel;

public class Test {
	private static String path = "D:\\ss.xls";
	public static void main(String args[]){
		ExcelReader2003 er = new ExcelReader2003();
		er.setDataListener(new ExcelDataListener() { //设置监听事件 
			@Override
			public void getData(String data, String sheet) {
				System.out.println(sheet+data); //得到返回的excel中每行的数据
			}
		});
		er.getContent(path); 
	}

}