java读写excel文件

　　近期处理的数据规模比较大，正好又是统计合并的事情，想着借助excel就可以完成了，然后就了解了下java读取excel的事情。

　　读取的文件主要分两类：xls文件、xlsx文件。xls文件的相关操作用的是jxl.jar包，只要将这个包导入即可。xlsx文件的相关操作是利用apache的poi包。

一、xls文件（一个jar包：jxl.jar）

1）创建

package jexcel;  
 
import java.io.*;
import jxl.*;
import jxl.write.*;   
 
/**
 * @author Ken
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class CreateXLS {  
 
    public static void main(String[] args) {
        try {
            //open file.
            WritableWorkbook book = Workbook.createWorkbook(new File("d:/Test.xls"));  
 
            //create Sheet named "Sheet_1". 0 means this is 1st page.
            WritableSheet sheet = book.createSheet("Sheet_1", );  
 
            //define cell column and row in Label Constructor, and cell content write "test".
            //cell is 1st-Column,1st-Row. value is "test".
            Label label = new Label(, , "test");
            //add defined cell above to sheet instance.
            sheet.addCell(label);  
 
            //create cell using add numeric. WARN:necessarily use integrated package-path, otherwise will be throws path-error.
            //cell is 2nd-Column, 1st-Row. value is 789.123.
            jxl.write.Number number = new jxl.write.Number(, , 789.123);
            //add defined cell above to sheet instance.
            sheet.addCell(number);  
 
            //add defined all cell above to case.
            book.write();
            //close file case.
            book.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}  

2）读取

package jexcel;
import java.io.*;
import jxl.*;  
 
/**
 * @author Ken
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class ReadXLS {  
 
    public static void main(String[] args) {
        try {
            Workbook book = Workbook.getWorkbook(new File("e:/pos/rule.xls"));
            //get a Sheet object.
            Sheet sheet = book.getSheet();
            //get 1st-Column,1st-Row content.
           // Cell cell = sheet.getCell(1, 2); //先是列序号，然后是行序号，都是从0开始算起
            Cell[] cell=sheet.getColumn();
            for(int i=;i<cell.length;i++){
                String result = cell[i].getContents();
                System.out.println(result);
            }
 
            book.close();
        } catch (Exception e) {
            e.printStackTrace();
        }  
 
    }
}  

3）修改

package jexcel;
 
import java.io.*;
import jxl.*;
import jxl.write.*;  
 
/**
 * @author Ken
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class UpdateXLS {  
 
    public static void main(String[] args) {
        try {
            //get file.
            Workbook wb = Workbook.getWorkbook(new File("d:/Test.xls"));
            //open a copy file(new file), then write content with same content with Test.xls.
            WritableWorkbook book =
                Workbook.createWorkbook(new File("d:/Test.xls"), wb);
            //add a Sheet.
            WritableSheet sheet = book.createSheet("Sheet_2", );
            sheet.addCell(new Label(, , "test2"));
            book.write();
            book.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}  

二、xlsx文件（五个jar包：poi-3.8-20120326.jar; poi-ooxml-3.8-20120326.jar; poi-ooxml-schemas-3.8-20120326.jar; xmlbeans-2.3.0.jar; dom4j-1.6.1.jar）

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
import java.util.logging.Logger;
 
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
public class xlsx {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        poiExcel("e:/pos/rules.xlsx");
    }
 
    private static void poiExcel(String saveName){
               try{
                    String realPath =saveName;
                    File fileDes = new File(realPath);
                    InputStream str = new FileInputStream(fileDes);
                    XSSFWorkbook xwb = new XSSFWorkbook(str);  //利用poi读取excel文件流
                    XSSFSheet st = xwb.getSheetAt();  //读取sheet的第一个工作表
                    int rows=st.getLastRowNum();//总行数
                    int cols;//总列数
                    //log.info("========行========"+rows);
                    for(int i=;i<rows;i++){
                        XSSFRow row=st.getRow(i);//读取某一行数据
                        if(row!=null){
                            //获取行中所有列数据
                            cols=row.getLastCellNum();
                            //log.info("========行========"+rows+"=====列========"+cols);  
 
                            for(int j=;j<cols;j++){
                                XSSFCell cell=row.getCell(j);
                                if(cell==null){
                                    System.out.print("   ");
                                }else{
                            //判断单元格的数据类型
                                    switch (cell.getCellType()) {
                                    case XSSFCell.CELL_TYPE_NUMERIC: // 数字
                                        System.out.print(cell.getNumericCellValue() + "   ");
                                        break;
                                    case XSSFCell.CELL_TYPE_STRING: // 字符串
                                        System.out.print(cell.getStringCellValue() + "   ");
                                        break;
                                    case XSSFCell.CELL_TYPE_BOOLEAN: // Boolean
                                        System.out.println(cell.getBooleanCellValue() + "   ");
                                        break;
                                    case XSSFCell.CELL_TYPE_FORMULA: // 公式
                                        System.out.print(cell.getCellFormula() + "   ");
                                        break;
                                    case XSSFCell.CELL_TYPE_BLANK: // 空值
                                        System.out.println("");
                                        break;
                                    case XSSFCell.CELL_TYPE_ERROR: // 故障
                                        System.out.println("故障");
                                        break;
                                    default:
                                        System.out.print("未知类型   ");
                                        break;
                                    }
                                }
                            }  
 
                        }
                    }
                }catch(IOException e){
                    e.printStackTrace();
                }  
 
            }  
 
}

代码全是网上贴来的，大家一起分享。。

想把jar包也贴上来的，但是不知道是不支持还是我自己摸索不出来，反正最后是没贴出来。。。