java poi技术操作excel之读取Excel

import java.io.BufferedWriter;  

import java.io.File;  

import java.io.FileInputStream;  

import java.io.FileWriter;  

import java.io.IOException;  

import java.io.InputStream;  

import java.text.SimpleDateFormat;  

  

import org.apache.poi.hssf.usermodel.HSSFWorkbook;  

import org.apache.poi.ss.usermodel.Cell;  

import org.apache.poi.ss.usermodel.DateUtil;  

import org.apache.poi.ss.usermodel.Row;  

import org.apache.poi.ss.usermodel.Sheet;  

import org.apache.poi.ss.usermodel.Workbook;  

import org.apache.poi.xssf.usermodel.XSSFWorkbook;  

  

public class ReadWriteExcel {  

  

    private static final String EXCEL_XLS = "xls";  

    private static final String EXCEL_XLSX = "xlsx";  

  

    /** 

     * 判断Excel的版本,获取Workbook 

     * @param in 

     * @param filename 

     * @return 

     * @throws IOException 

     */  

    public static Workbook getWorkbok(InputStream in,File file) throws IOException{  

        Workbook wb = null;  

        if(file.getName().endsWith(EXCEL_XLS)){  //Excel 2003  

            wb = new HSSFWorkbook(in);  

        }else if(file.getName().endsWith(EXCEL_XLSX)){  // Excel 2007/2010  

            wb = new XSSFWorkbook(in);  

        }  

        return wb;  

    }  

  

    /** 

     * 判断文件是否是excel 

     * @throws Exception  

     */  

    public static void checkExcelVaild(File file) throws Exception{  

        if(!file.exists()){  

            throw new Exception("文件不存在");  

        }  

        if(!(file.isFile() && (file.getName().endsWith(EXCEL_XLS) || file.getName().endsWith(EXCEL_XLSX)))){  

            throw new Exception("文件不是Excel");  

        }  

    }  

  

    /** 

     * 读取Excel测试，兼容 Excel 2003/2007/2010 

     * @throws Exception  

     */  

    public static void main(String[] args) throws Exception {  

        SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");  

        BufferedWriter bw = new BufferedWriter(new FileWriter(new File("E:/xxx/InsertSql.txt")));  

        try {  

            // 同时支持Excel 2003、2007  

            File excelFile = new File("E:/xxx.xlsx"); // 创建文件对象  

            FileInputStream is = new FileInputStream(excelFile); // 文件流  

            checkExcelVaild(excelFile);  

            Workbook workbook = getWorkbok(is,excelFile);  

            //Workbook workbook = WorkbookFactory.create(is); // 这种方式 Excel2003/2007/2010都是可以处理的  

  

            int sheetCount = workbook.getNumberOfSheets(); // Sheet的数量  

            /** 

             * 设置当前excel中sheet的下标：0开始 

             */  

            Sheet sheet = workbook.getSheetAt(0);   // 遍历第一个Sheet  

  

            // 为跳过第一行目录设置count  

            int count = 0;  

  

            for (Row row : sheet) {  

                // 跳过第一行的目录  

                if(count == 0){  

                    count++;  

                    continue;  

                }  

                // 如果当前行没有数据，跳出循环  

                if(row.getCell(0).toString().equals("")){  

                    return ;  

                }  

                String rowValue = "";  

                for (Cell cell : row) {  

                    if(cell.toString() == null){  

                        continue;  

                    }  

                    int cellType = cell.getCellType();  

                    String cellValue = "";  

                    switch (cellType) {  

                        case Cell.CELL_TYPE_STRING:     // 文本  

                            cellValue = cell.getRichStringCellValue().getString() + "#";  

                            break;  

                        case Cell.CELL_TYPE_NUMERIC:    // 数字、日期  

                            if (DateUtil.isCellDateFormatted(cell)) {  

                                cellValue = fmt.format(cell.getDateCellValue()) + "#";  

                            } else {  

                                cell.setCellType(Cell.CELL_TYPE_STRING);  

                                cellValue = String.valueOf(cell.getRichStringCellValue().getString()) + "#";  

                            }  

                            break;  

                        case Cell.CELL_TYPE_BOOLEAN:    // 布尔型  

                            cellValue = String.valueOf(cell.getBooleanCellValue()) + "#";  

                            break;  

                        case Cell.CELL_TYPE_BLANK: // 空白  

                            cellValue = cell.getStringCellValue() + "#";  

                            break;  

                        case Cell.CELL_TYPE_ERROR: // 错误  

                            cellValue = "错误#";  

                            break;  

                        case Cell.CELL_TYPE_FORMULA:    // 公式  

                            // 得到对应单元格的公式  

                            //cellValue = cell.getCellFormula() + "#";  

                            // 得到对应单元格的字符串  

                            cell.setCellType(Cell.CELL_TYPE_STRING);  

                            cellValue = String.valueOf(cell.getRichStringCellValue().getString()) + "#";  

                            break;  

                        default:  

                            cellValue = "#";  

                    }  

                    //System.out.print(cellValue);  

                    rowValue += cellValue;  

                }  

                writeSql(rowValue,bw);  

                System.out.println(rowValue);  

                System.out.println();  

            }  

            bw.flush();  

        } catch (Exception e) {  

            e.printStackTrace();  

        } finally{  

            bw.close();  

        }  

    }  

// 将值拼成sql语句  

    public static void writeSql(String rowValue,BufferedWriter bw) throws IOException{  

        String[] sqlValue = rowValue.split("#");  

        String sql = "";  

        sql="INSERT INTO table_name (列名1) VALUES("+ sqlValue[0].trim() + ");"+"\n";  

        System.out.print(sql);  

        try {  

            bw.write(sql);  

            bw.newLine();  

        } catch (IOException e) {  

            e.printStackTrace();  

        }  

    }