Java操作excel表格

（1）Java读取excel表格

package com.songyan.excel;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
public class ReadExcel {
    public static void main(String[] args) {
        ReadExcel obj = new ReadExcel();
        // 此处为我创建Excel路径：E:/zhanhj/studysrc/jxl下
        File file = new File("D:/啊.xls");
        List excelList = obj.readExcel(file);
        System.out.println(obj.readExcel2(file));
       /* System.out.println("list中的数据打印出来");
        for (int i = 0; i < excelList.size(); i++) {
            List list = (List) excelList.get(i);
            for (int j = 0; j < list.size(); j++) {
                System.out.print(list.get(j));
            }
            System.out.println();
        }*/

    }

    // 去读Excel的方法readExcel，该方法的入口参数为一个File对象
    public String readExcel2(File file) {
        String res = "";
        try {
            // 创建输入流，读取Excel
            InputStream is = new FileInputStream(file.getAbsolutePath());
            // jxl提供的Workbook类
            Workbook wb = Workbook.getWorkbook(is);
            // Excel的页签数量
            int sheet_size = wb.getNumberOfSheets();
            for (int index = 0; index < sheet_size; index++) {
                List<List> outerList=new ArrayList<List>();
                // 每个页签创建一个Sheet对象
                Sheet sheet = wb.getSheet(index);
                // sheet.getRows()返回该页的总行数
                for (int i = 0; i < sheet.getRows(); i++) {
                    List innerList=new ArrayList();
                    // sheet.getColumns()返回该页的总列数
                    for (int j = 0; j < sheet.getColumns(); j++) {
                        String cellinfo = sheet.getCell(j, i).getContents();
                        if(cellinfo.isEmpty()){
                            continue;
                        }
                        innerList.add(cellinfo);
                        res  = res + cellinfo + ",";
                    }
                    outerList.add(i, innerList);
                }
                return res.substring(4,res.length()-1);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (BiffException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    // 去读Excel的方法readExcel，该方法的入口参数为一个File对象
    public List readExcel(File file) {
        try {
            // 创建输入流，读取Excel
            InputStream is = new FileInputStream(file.getAbsolutePath());
            // jxl提供的Workbook类
            Workbook wb = Workbook.getWorkbook(is);
            // Excel的页签数量
            int sheet_size = wb.getNumberOfSheets();
            for (int index = 0; index < sheet_size; index++) {
                List<List> outerList=new ArrayList<List>();
                // 每个页签创建一个Sheet对象
                Sheet sheet = wb.getSheet(index);
                // sheet.getRows()返回该页的总行数
                for (int i = 0; i < sheet.getRows(); i++) {
                    List innerList=new ArrayList();
                    // sheet.getColumns()返回该页的总列数
                    for (int j = 0; j < sheet.getColumns(); j++) {
                        String cellinfo = sheet.getCell(j, i).getContents();
                        if(cellinfo.isEmpty()){
                            continue;
                        }
                        innerList.add(cellinfo);
                        /*System.out.print(cellinfo);*/
                    }
                    outerList.add(i, innerList);
                   /* System.out.println();*/
                }
                return outerList;
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (BiffException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

read && console:

（2）生成excel&&写入表格

package com.songyan.excel;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
public class ReadExcel {
    public static void main(String[] args) {
        ReadExcel.writeExcel("D:\\11.xls");
    }

public static void writeExcel(String fileName){
        WritableWorkbook wwb = null;
        try {
            // 创建一个可写入的工作簿（WorkBook）对象,
            //这里用父类方法createWorkbook创建子类WritableWorkbook让我想起了工厂方法
            wwb = Workbook.createWorkbook(new File(fileName));

            // 创建一个可写入的工作表
            // Workbook的createSheet方法有两个参数，第一个是工作表的名称，第二个是工作表在工作簿中的位置
            WritableSheet ws = wwb.createSheet("sheetTest", 0);
            Label labelC = new Label(0,0,"专利号");
            Label labeld = new Label(0,1,"例：CN201621266091.4");
            Label labele = new Label(0,2,"例：CN201621266091.6");
            ws.addCell(labelC);
            ws.addCell(labeld);
            ws.addCell(labele);

            wwb.write();// 从内从中写入文件中
            wwb.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("生成第一个Excel文件"+fileName+"成功");
    }

}

console && 生成文件