POI 解析Excel

转自豆丁网：http://www.docin.com/p-4556557.html#

由于豆丁网不能复制，只能一行代码一行代码的敲。

package com.s2sh.test; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.Date; 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; public class ExcelReader { //创建文件输入流 private BufferedReader reader = null; //文件类型 private String fileType; //文件二进制输入流 private InputStream is = null; //当前sheet private int currSheet; //当前位置 private int currPosition; //sheet数量 private int numOfSheets; //HSSFWorkbook HSSFWorkbook workbook = null; //设置cell之间以空格分隔 private static String EXCEL_LINE_DELIMITER = ""; //设置最大列数 private static int MAX_EXCEL_COLUMNS = 64; //构造函数创建一个ExcelReader public ExcelReader(String inputfile) throws IOException,Exception { //判断参数是否为空或者没有意义 if(null == inputfile && "".equals(inputfile.trim())) { throw new IOException("no input file specified"); } //取得文件名后缀赋值给fileType this.fileType = inputfile.substring(inputfile.lastIndexOf(".")+1); //设置开始行为0 currPosition = 0; //设置当前位置为0 currSheet = 0; //创建输入流 is = new FileInputStream(inputfile); //判断文件格式 if(fileType.equalsIgnoreCase("txt")) { //如果是txt则直接创建BufferReader读取 reader = new BufferedReader(new InputStreamReader(is)); } else if(fileType.equalsIgnoreCase("xls")) { //如果是Excel文件则创建HSSFWorkbook读取 workbook = new HSSFWorkbook(is); //设置sheet数 numOfSheets = workbook.getNumberOfSheets(); }else { throw new Exception("File Type not Supported"); } } //函数readLine读取文本的一行 public String readLine() throws IOException { //如果是txt则通过reader读取 if(fileType.equalsIgnoreCase("txt")) { String str = reader.readLine(); //空行则略去，直接读取下一行 while(str.trim().equals("")) { str = reader.readLine(); } return str; } //如果是xls文件则通过POI提供给的API读取文件 else if(fileType.equalsIgnoreCase("xls")) { //根据currSheet值获得当前的sheet HSSFSheet sheet = workbook.getSheetAt(currSheet); //判断当前行是否到当前sheet的结尾 if(currPosition > sheet.getLastRowNum()) { //当前行位置清零 currPosition = 0; //判断是否还有Sheet while(currSheet != numOfSheets -1){ //得到下一个sheet sheet = workbook.getSheetAt(currSheet+1); //判断当前行是否到当前sheet的结尾 if(currPosition == sheet.getLastRowNum()) { currSheet++; continue; }else { //获取当前行数 int row = currPosition; currPosition++; //读取当前行数据 return getLine(sheet,row); } } return null; } //获取当前行数 int row = currPosition; currPosition++; //读取当前行数据 return getLine(sheet,row); } return null; } //函数getLine返回sheet的一行数据 private String getLine (HSSFSheet sheet,int row) { //根据行数取得sheet的一行 HSSFRow rowLine = sheet.getRow(row); //创建字符串缓冲区 StringBuffer buffer = new StringBuffer(); //获取挡前行的列数 int filledColumns = rowLine.getLastCellNum(); HSSFCell cell = null; //循环遍历所有列 for(int i=0;i<filledColumns;i++) { //取得当前cell cell = rowLine.getCell(i); String cellValue = null; if(null != cell) { //判断当前cell的type switch(cell.getCellType()) { //如果当前cell的type为NUMERIC case HSSFCell.CELL_TYPE_NUMERIC : { //判断当前cell是否为Date if(HSSFDateUtil.isCellDateFormatted(cell)){ //如果是Date类型，取得该Cell的Date值 Date date = cell.getDateCellValue(); //把Date转换成本地格式的字符串 cellValue = new java.text.SimpleDateFormat( " yyyy-MM-dd HH:mm " ).format(cell.getDateCellValue()); } //如果是纯数字 else { //取得当前cell的数值 Integer num = new Integer((int)cell.getNumericCellValue());//默认返回时double类型 cellValue = String.valueOf(num); } break; } //如果当前cell的type为String case HSSFCell.CELL_TYPE_STRING : //取得当前shell的字符串 cellValue = cell.getStringCellValue().replaceAll("/'", "/""); break; //默认的cell值 default: cellValue = ""; } }else { cellValue = ""; } //在每个字段之间插入分隔符 buffer.append(cellValue).append(EXCEL_LINE_DELIMITER); } //以字符串返回该行的数据 return buffer.toString(); } //close函数执行流的关闭操作 public void close() { //如果id不为空，则关闭InputStream文件输入流 if(is != null) { try { is.close(); }catch(IOException e) { is = null; } } //如果reader不为空，则关闭BufferedReader文件输入流 if(reader != null) { try { reader.close(); }catch(IOException e) { reader = null; } } }

测试类：

public class ExcelReaderTest { /** * @param args */ public static void main(String[] args) { try { ExcelReader er = new ExcelReader("D://SAPI//task//CBS00087558//records.xls"); String line = er.readLine(); while(line != null) { System.out.println(line); line = er.readLine(); } er.close(); }catch(Exception e) { e.printStackTrace(); } } }